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3    * DO NOT REMOVE OR ALTER!
4    */
5   /*
6    * Copyright 1999-2004 The Apache Software Foundation.
7    *
8    * Licensed under the Apache License, Version 2.0 (the "License");
9    * you may not use this file except in compliance with the License.
10   * You may obtain a copy of the License at
11   *
12   *     http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing, software
15   * distributed under the License is distributed on an "AS IS" BASIS,
16   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17   * See the License for the specific language governing permissions and
18   * limitations under the License.
19   */
20  /*
21   * $Id: URI.java,v 1.2.4.1 2005/09/15 08:16:00 suresh_emailid Exp $
22   */
23  package com.sun.org.apache.xml.internal.utils;
24  
25  import java.io.IOException;
26  import java.io.Serializable;
27  
28  import com.sun.org.apache.xml.internal.res.XMLErrorResources;
29  import com.sun.org.apache.xml.internal.res.XMLMessages;
30  import java.util.Objects;
31  
32  /**
33   * A class to represent a Uniform Resource Identifier (URI). This class
34   * is designed to handle the parsing of URIs and provide access to
35   * the various components (scheme, host, port, userinfo, path, query
36   * string and fragment) that may constitute a URI.
37   * <p>
38   * Parsing of a URI specification is done according to the URI
39   * syntax described in RFC 2396
40   * <http://www.ietf.org/rfc/rfc2396.txt?number=2396>. Every URI consists
41   * of a scheme, followed by a colon (':'), followed by a scheme-specific
42   * part. For URIs that follow the "generic URI" syntax, the scheme-
43   * specific part begins with two slashes ("//") and may be followed
44   * by an authority segment (comprised of user information, host, and
45   * port), path segment, query segment and fragment. Note that RFC 2396
46   * no longer specifies the use of the parameters segment and excludes
47   * the "user:password" syntax as part of the authority segment. If
48   * "user:password" appears in a URI, the entire user/password string
49   * is stored as userinfo.
50   * <p>
51   * For URIs that do not follow the "generic URI" syntax (e.g. mailto),
52   * the entire scheme-specific part is treated as the "path" portion
53   * of the URI.
54   * <p>
55   * Note that, unlike the java.net.URL class, this class does not provide
56   * any built-in network access functionality nor does it provide any
57   * scheme-specific functionality (for example, it does not know a
58   * default port for a specific scheme). Rather, it only knows the
59   * grammar and basic set of operations that can be applied to a URI.
60   *
61   *
62   */
63  public class URI implements Serializable
64  {
65      static final long serialVersionUID = 7096266377907081897L;
66  
67    /**
68     * MalformedURIExceptions are thrown in the process of building a URI
69     * or setting fields on a URI when an operation would result in an
70     * invalid URI specification.
71     *
72     */
73    public static class MalformedURIException extends IOException
74    {
75  
76      /**
77       * Constructs a <code>MalformedURIException</code> with no specified
78       * detail message.
79       */
80      public MalformedURIException()
81      {
82        super();
83      }
84  
85      /**
86       * Constructs a <code>MalformedURIException</code> with the
87       * specified detail message.
88       *
89       * @param p_msg the detail message.
90       */
91      public MalformedURIException(String p_msg)
92      {
93        super(p_msg);
94      }
95    }
96  
97    /** reserved characters */
98    private static final String RESERVED_CHARACTERS = ";/?:@&=+$,";
99  
100   /**
101    * URI punctuation mark characters - these, combined with
102    *   alphanumerics, constitute the "unreserved" characters
103    */
104   private static final String MARK_CHARACTERS = "-_.!~*'() ";
105 
106   /** scheme can be composed of alphanumerics and these characters */
107   private static final String SCHEME_CHARACTERS = "+-.";
108 
109   /**
110    * userinfo can be composed of unreserved, escaped and these
111    *   characters
112    */
113   private static final String USERINFO_CHARACTERS = ";:&=+$,";
114 
115   /** Stores the scheme (usually the protocol) for this URI.
116    *  @serial */
117   private String m_scheme = null;
118 
119   /** If specified, stores the userinfo for this URI; otherwise null.
120    *  @serial */
121   private String m_userinfo = null;
122 
123   /** If specified, stores the host for this URI; otherwise null.
124    *  @serial */
125   private String m_host = null;
126 
127   /** If specified, stores the port for this URI; otherwise -1.
128    *  @serial */
129   private int m_port = -1;
130 
131   /** If specified, stores the path for this URI; otherwise null.
132    *  @serial */
133   private String m_path = null;
134 
135   /**
136    * If specified, stores the query string for this URI; otherwise
137    *   null.
138    * @serial
139    */
140   private String m_queryString = null;
141 
142   /** If specified, stores the fragment for this URI; otherwise null.
143    *  @serial */
144   private String m_fragment = null;
145 
146   /** Indicate whether in DEBUG mode          */
147   private static boolean DEBUG = false;
148 
149   /**
150    * Construct a new and uninitialized URI.
151    */
152   public URI(){}
153 
154   /**
155    * Construct a new URI from another URI. All fields for this URI are
156    * set equal to the fields of the URI passed in.
157    *
158    * @param p_other the URI to copy (cannot be null)
159    */
160   public URI(URI p_other)
161   {
162     initialize(p_other);
163   }
164 
165   /**
166    * Construct a new URI from a URI specification string. If the
167    * specification follows the "generic URI" syntax, (two slashes
168    * following the first colon), the specification will be parsed
169    * accordingly - setting the scheme, userinfo, host,port, path, query
170    * string and fragment fields as necessary. If the specification does
171    * not follow the "generic URI" syntax, the specification is parsed
172    * into a scheme and scheme-specific part (stored as the path) only.
173    *
174    * @param p_uriSpec the URI specification string (cannot be null or
175    *                  empty)
176    *
177    * @throws MalformedURIException if p_uriSpec violates any syntax
178    *                                   rules
179    */
180   public URI(String p_uriSpec) throws MalformedURIException
181   {
182     this((URI) null, p_uriSpec);
183   }
184 
185   /**
186    * Construct a new URI from a base URI and a URI specification string.
187    * The URI specification string may be a relative URI.
188    *
189    * @param p_base the base URI (cannot be null if p_uriSpec is null or
190    *               empty)
191    * @param p_uriSpec the URI specification string (cannot be null or
192    *                  empty if p_base is null)
193    *
194    * @throws MalformedURIException if p_uriSpec violates any syntax
195    *                                  rules
196    */
197   public URI(URI p_base, String p_uriSpec) throws MalformedURIException
198   {
199     initialize(p_base, p_uriSpec);
200   }
201 
202   /**
203    * Construct a new URI that does not follow the generic URI syntax.
204    * Only the scheme and scheme-specific part (stored as the path) are
205    * initialized.
206    *
207    * @param p_scheme the URI scheme (cannot be null or empty)
208    * @param p_schemeSpecificPart the scheme-specific part (cannot be
209    *                             null or empty)
210    *
211    * @throws MalformedURIException if p_scheme violates any
212    *                                  syntax rules
213    */
214   public URI(String p_scheme, String p_schemeSpecificPart)
215           throws MalformedURIException
216   {
217 
218     if (p_scheme == null || p_scheme.trim().length() == 0)
219     {
220       throw new MalformedURIException(
221         "Cannot construct URI with null/empty scheme!");
222     }
223 
224     if (p_schemeSpecificPart == null
225             || p_schemeSpecificPart.trim().length() == 0)
226     {
227       throw new MalformedURIException(
228         "Cannot construct URI with null/empty scheme-specific part!");
229     }
230 
231     setScheme(p_scheme);
232     setPath(p_schemeSpecificPart);
233   }
234 
235   /**
236    * Construct a new URI that follows the generic URI syntax from its
237    * component parts. Each component is validated for syntax and some
238    * basic semantic checks are performed as well.  See the individual
239    * setter methods for specifics.
240    *
241    * @param p_scheme the URI scheme (cannot be null or empty)
242    * @param p_host the hostname or IPv4 address for the URI
243    * @param p_path the URI path - if the path contains '?' or '#',
244    *               then the query string and/or fragment will be
245    *               set from the path; however, if the query and
246    *               fragment are specified both in the path and as
247    *               separate parameters, an exception is thrown
248    * @param p_queryString the URI query string (cannot be specified
249    *                      if path is null)
250    * @param p_fragment the URI fragment (cannot be specified if path
251    *                   is null)
252    *
253    * @throws MalformedURIException if any of the parameters violates
254    *                                  syntax rules or semantic rules
255    */
256   public URI(String p_scheme, String p_host, String p_path, String p_queryString, String p_fragment)
257           throws MalformedURIException
258   {
259     this(p_scheme, null, p_host, -1, p_path, p_queryString, p_fragment);
260   }
261 
262   /**
263    * Construct a new URI that follows the generic URI syntax from its
264    * component parts. Each component is validated for syntax and some
265    * basic semantic checks are performed as well.  See the individual
266    * setter methods for specifics.
267    *
268    * @param p_scheme the URI scheme (cannot be null or empty)
269    * @param p_userinfo the URI userinfo (cannot be specified if host
270    *                   is null)
271    * @param p_host the hostname or IPv4 address for the URI
272    * @param p_port the URI port (may be -1 for "unspecified"; cannot
273    *               be specified if host is null)
274    * @param p_path the URI path - if the path contains '?' or '#',
275    *               then the query string and/or fragment will be
276    *               set from the path; however, if the query and
277    *               fragment are specified both in the path and as
278    *               separate parameters, an exception is thrown
279    * @param p_queryString the URI query string (cannot be specified
280    *                      if path is null)
281    * @param p_fragment the URI fragment (cannot be specified if path
282    *                   is null)
283    *
284    * @throws MalformedURIException if any of the parameters violates
285    *                                  syntax rules or semantic rules
286    */
287   public URI(String p_scheme, String p_userinfo, String p_host, int p_port, String p_path, String p_queryString, String p_fragment)
288           throws MalformedURIException
289   {
290 
291     if (p_scheme == null || p_scheme.trim().length() == 0)
292     {
293       throw new MalformedURIException(XMLMessages.createXMLMessage(XMLErrorResources.ER_SCHEME_REQUIRED, null)); //"Scheme is required!");
294     }
295 
296     if (p_host == null)
297     {
298       if (p_userinfo != null)
299       {
300         throw new MalformedURIException(
301           XMLMessages.createXMLMessage(XMLErrorResources.ER_NO_USERINFO_IF_NO_HOST, null)); //"Userinfo may not be specified if host is not specified!");
302       }
303 
304       if (p_port != -1)
305       {
306         throw new MalformedURIException(
307           XMLMessages.createXMLMessage(XMLErrorResources.ER_NO_PORT_IF_NO_HOST, null)); //"Port may not be specified if host is not specified!");
308       }
309     }
310 
311     if (p_path != null)
312     {
313       if (p_path.indexOf('?') != -1 && p_queryString != null)
314       {
315         throw new MalformedURIException(
316           XMLMessages.createXMLMessage(XMLErrorResources.ER_NO_QUERY_STRING_IN_PATH, null)); //"Query string cannot be specified in path and query string!");
317       }
318 
319       if (p_path.indexOf('#') != -1 && p_fragment != null)
320       {
321         throw new MalformedURIException(
322           XMLMessages.createXMLMessage(XMLErrorResources.ER_NO_FRAGMENT_STRING_IN_PATH, null)); //"Fragment cannot be specified in both the path and fragment!");
323       }
324     }
325 
326     setScheme(p_scheme);
327     setHost(p_host);
328     setPort(p_port);
329     setUserinfo(p_userinfo);
330     setPath(p_path);
331     setQueryString(p_queryString);
332     setFragment(p_fragment);
333   }
334 
335   /**
336    * Initialize all fields of this URI from another URI.
337    *
338    * @param p_other the URI to copy (cannot be null)
339    */
340   private void initialize(URI p_other)
341   {
342 
343     m_scheme = p_other.getScheme();
344     m_userinfo = p_other.getUserinfo();
345     m_host = p_other.getHost();
346     m_port = p_other.getPort();
347     m_path = p_other.getPath();
348     m_queryString = p_other.getQueryString();
349     m_fragment = p_other.getFragment();
350   }
351 
352   /**
353    * Initializes this URI from a base URI and a URI specification string.
354    * See RFC 2396 Section 4 and Appendix B for specifications on parsing
355    * the URI and Section 5 for specifications on resolving relative URIs
356    * and relative paths.
357    *
358    * @param p_base the base URI (may be null if p_uriSpec is an absolute
359    *               URI)
360    * @param p_uriSpec the URI spec string which may be an absolute or
361    *                  relative URI (can only be null/empty if p_base
362    *                  is not null)
363    *
364    * @throws MalformedURIException if p_base is null and p_uriSpec
365    *                                  is not an absolute URI or if
366    *                                  p_uriSpec violates syntax rules
367    */
368   private void initialize(URI p_base, String p_uriSpec)
369           throws MalformedURIException
370   {
371 
372     if (p_base == null
373             && (p_uriSpec == null || p_uriSpec.trim().length() == 0))
374     {
375       throw new MalformedURIException(
376         XMLMessages.createXMLMessage(XMLErrorResources.ER_CANNOT_INIT_URI_EMPTY_PARMS, null)); //"Cannot initialize URI with empty parameters.");
377     }
378 
379     // just make a copy of the base if spec is empty
380     if (p_uriSpec == null || p_uriSpec.trim().length() == 0)
381     {
382       initialize(p_base);
383 
384       return;
385     }
386 
387     String uriSpec = p_uriSpec.trim();
388     int uriSpecLen = uriSpec.length();
389     int index = 0;
390 
391     // check for scheme
392     int colonIndex = uriSpec.indexOf(':');
393     if (colonIndex < 0)
394     {
395       if (p_base == null)
396       {
397         throw new MalformedURIException(XMLMessages.createXMLMessage(XMLErrorResources.ER_NO_SCHEME_IN_URI, new Object[]{uriSpec})); //"No scheme found in URI: "+uriSpec);
398       }
399     }
400     else
401     {
402       initializeScheme(uriSpec);
403       uriSpec = uriSpec.substring(colonIndex+1);
404       // This is a fix for XALANJ-2059.
405       if(m_scheme != null && p_base != null)
406       {
407         // a) If <uriSpec> starts with a slash (/), it means <uriSpec> is absolute
408         //    and p_base can be ignored.
409         //    For example,
410         //    uriSpec = file:/myDIR/myXSLFile.xsl
411         //    p_base = file:/myWork/
412         //
413         //    Here, uriSpec has absolute path after scheme file and :
414         //    Hence p_base can be ignored.
415         //
416         // b) Similarily, according to RFC 2396, uri is resolved for <uriSpec> relative to <p_base>
417         //    if scheme in <uriSpec> is same as scheme in <p_base>, else p_base can be ignored.
418         //
419         // c) if <p_base> is not hierarchical, it can be ignored.
420         //
421         if(uriSpec.startsWith("/") || !m_scheme.equals(p_base.m_scheme) || !p_base.getSchemeSpecificPart().startsWith("/"))
422         {
423           p_base = null;
424         }
425       }
426       // Fix for XALANJ-2059
427       uriSpecLen = uriSpec.length();
428     }
429 
430     // two slashes means generic URI syntax, so we get the authority
431     if (((index + 1) < uriSpecLen)
432             && (uriSpec.substring(index).startsWith("//")))
433     {
434       index += 2;
435 
436       int startPos = index;
437 
438       // get authority - everything up to path, query or fragment
439       char testChar = '\0';
440 
441       while (index < uriSpecLen)
442       {
443         testChar = uriSpec.charAt(index);
444 
445         if (testChar == '/' || testChar == '?' || testChar == '#')
446         {
447           break;
448         }
449 
450         index++;
451       }
452 
453       // if we found authority, parse it out, otherwise we set the
454       // host to empty string
455       if (index > startPos)
456       {
457         initializeAuthority(uriSpec.substring(startPos, index));
458       }
459       else
460       {
461         m_host = "";
462       }
463     }
464 
465     initializePath(uriSpec.substring(index));
466 
467     // Resolve relative URI to base URI - see RFC 2396 Section 5.2
468     // In some cases, it might make more sense to throw an exception
469     // (when scheme is specified is the string spec and the base URI
470     // is also specified, for example), but we're just following the
471     // RFC specifications
472     if (p_base != null)
473     {
474 
475       // check to see if this is the current doc - RFC 2396 5.2 #2
476       // note that this is slightly different from the RFC spec in that
477       // we don't include the check for query string being null
478       // - this handles cases where the urispec is just a query
479       // string or a fragment (e.g. "?y" or "#s") -
480       // see <http://www.ics.uci.edu/~fielding/url/test1.html> which
481       // identified this as a bug in the RFC
482       if (m_path.length() == 0 && m_scheme == null && m_host == null)
483       {
484         m_scheme = p_base.getScheme();
485         m_userinfo = p_base.getUserinfo();
486         m_host = p_base.getHost();
487         m_port = p_base.getPort();
488         m_path = p_base.getPath();
489 
490         if (m_queryString == null)
491         {
492           m_queryString = p_base.getQueryString();
493         }
494 
495         return;
496       }
497 
498       // check for scheme - RFC 2396 5.2 #3
499       // if we found a scheme, it means absolute URI, so we're done
500       if (m_scheme == null)
501       {
502         m_scheme = p_base.getScheme();
503       }
504 
505       // check for authority - RFC 2396 5.2 #4
506       // if we found a host, then we've got a network path, so we're done
507       if (m_host == null)
508       {
509         m_userinfo = p_base.getUserinfo();
510         m_host = p_base.getHost();
511         m_port = p_base.getPort();
512       }
513       else
514       {
515         return;
516       }
517 
518       // check for absolute path - RFC 2396 5.2 #5
519       if (m_path.length() > 0 && m_path.startsWith("/"))
520       {
521         return;
522       }
523 
524       // if we get to this point, we need to resolve relative path
525       // RFC 2396 5.2 #6
526       String path = "";
527       String basePath = p_base.getPath();
528 
529       // 6a - get all but the last segment of the base URI path
530       if (basePath != null)
531       {
532         int lastSlash = basePath.lastIndexOf('/');
533 
534         if (lastSlash != -1)
535         {
536           path = basePath.substring(0, lastSlash + 1);
537         }
538       }
539 
540       // 6b - append the relative URI path
541       path = path.concat(m_path);
542 
543       // 6c - remove all "./" where "." is a complete path segment
544       index = -1;
545 
546       while ((index = path.indexOf("/./")) != -1)
547       {
548         path = path.substring(0, index + 1).concat(path.substring(index + 3));
549       }
550 
551       // 6d - remove "." if path ends with "." as a complete path segment
552       if (path.endsWith("/."))
553       {
554         path = path.substring(0, path.length() - 1);
555       }
556 
557       // 6e - remove all "<segment>/../" where "<segment>" is a complete
558       // path segment not equal to ".."
559       index = -1;
560 
561       int segIndex = -1;
562       String tempString = null;
563 
564       while ((index = path.indexOf("/../")) > 0)
565       {
566         tempString = path.substring(0, path.indexOf("/../"));
567         segIndex = tempString.lastIndexOf('/');
568 
569         if (segIndex != -1)
570         {
571           if (!tempString.substring(segIndex++).equals(".."))
572           {
573             path = path.substring(0, segIndex).concat(path.substring(index
574                     + 4));
575           }
576         }
577       }
578 
579       // 6f - remove ending "<segment>/.." where "<segment>" is a
580       // complete path segment
581       if (path.endsWith("/.."))
582       {
583         tempString = path.substring(0, path.length() - 3);
584         segIndex = tempString.lastIndexOf('/');
585 
586         if (segIndex != -1)
587         {
588           path = path.substring(0, segIndex + 1);
589         }
590       }
591 
592       m_path = path;
593     }
594   }
595 
596   /**
597    * Initialize the scheme for this URI from a URI string spec.
598    *
599    * @param p_uriSpec the URI specification (cannot be null)
600    *
601    * @throws MalformedURIException if URI does not have a conformant
602    *                                  scheme
603    */
604   private void initializeScheme(String p_uriSpec) throws MalformedURIException
605   {
606 
607     int uriSpecLen = p_uriSpec.length();
608     int index = 0;
609     String scheme = null;
610     char testChar = '\0';
611 
612     while (index < uriSpecLen)
613     {
614       testChar = p_uriSpec.charAt(index);
615 
616       if (testChar == ':' || testChar == '/' || testChar == '?'
617               || testChar == '#')
618       {
619         break;
620       }
621 
622       index++;
623     }
624 
625     scheme = p_uriSpec.substring(0, index);
626 
627     if (scheme.length() == 0)
628     {
629       throw new MalformedURIException(XMLMessages.createXMLMessage(XMLErrorResources.ER_NO_SCHEME_INURI, null)); //"No scheme found in URI.");
630     }
631     else
632     {
633       setScheme(scheme);
634     }
635   }
636 
637   /**
638    * Initialize the authority (userinfo, host and port) for this
639    * URI from a URI string spec.
640    *
641    * @param p_uriSpec the URI specification (cannot be null)
642    *
643    * @throws MalformedURIException if p_uriSpec violates syntax rules
644    */
645   private void initializeAuthority(String p_uriSpec)
646           throws MalformedURIException
647   {
648 
649     int index = 0;
650     int start = 0;
651     int end = p_uriSpec.length();
652     char testChar = '\0';
653     String userinfo = null;
654 
655     // userinfo is everything up @
656     if (p_uriSpec.indexOf('@', start) != -1)
657     {
658       while (index < end)
659       {
660         testChar = p_uriSpec.charAt(index);
661 
662         if (testChar == '@')
663         {
664           break;
665         }
666 
667         index++;
668       }
669 
670       userinfo = p_uriSpec.substring(start, index);
671 
672       index++;
673     }
674 
675     // host is everything up to ':'
676     String host = null;
677 
678     start = index;
679 
680     while (index < end)
681     {
682       testChar = p_uriSpec.charAt(index);
683 
684       if (testChar == ':')
685       {
686         break;
687       }
688 
689       index++;
690     }
691 
692     host = p_uriSpec.substring(start, index);
693 
694     int port = -1;
695 
696     if (host.length() > 0)
697     {
698 
699       // port
700       if (testChar == ':')
701       {
702         index++;
703 
704         start = index;
705 
706         while (index < end)
707         {
708           index++;
709         }
710 
711         String portStr = p_uriSpec.substring(start, index);
712 
713         if (portStr.length() > 0)
714         {
715           for (int i = 0; i < portStr.length(); i++)
716           {
717             if (!isDigit(portStr.charAt(i)))
718             {
719               throw new MalformedURIException(
720                 portStr + " is invalid. Port should only contain digits!");
721             }
722           }
723 
724           try
725           {
726             port = Integer.parseInt(portStr);
727           }
728           catch (NumberFormatException nfe)
729           {
730 
731             // can't happen
732           }
733         }
734       }
735     }
736 
737     setHost(host);
738     setPort(port);
739     setUserinfo(userinfo);
740   }
741 
742   /**
743    * Initialize the path for this URI from a URI string spec.
744    *
745    * @param p_uriSpec the URI specification (cannot be null)
746    *
747    * @throws MalformedURIException if p_uriSpec violates syntax rules
748    */
749   private void initializePath(String p_uriSpec) throws MalformedURIException
750   {
751 
752     if (p_uriSpec == null)
753     {
754       throw new MalformedURIException(
755         "Cannot initialize path from null string!");
756     }
757 
758     int index = 0;
759     int start = 0;
760     int end = p_uriSpec.length();
761     char testChar = '\0';
762 
763     // path - everything up to query string or fragment
764     while (index < end)
765     {
766       testChar = p_uriSpec.charAt(index);
767 
768       if (testChar == '?' || testChar == '#')
769       {
770         break;
771       }
772 
773       // check for valid escape sequence
774       if (testChar == '%')
775       {
776         if (index + 2 >= end ||!isHex(p_uriSpec.charAt(index + 1))
777                 ||!isHex(p_uriSpec.charAt(index + 2)))
778         {
779           throw new MalformedURIException(
780             XMLMessages.createXMLMessage(XMLErrorResources.ER_PATH_CONTAINS_INVALID_ESCAPE_SEQUENCE, null)); //"Path contains invalid escape sequence!");
781         }
782       }
783       else if (!isReservedCharacter(testChar)
784                &&!isUnreservedCharacter(testChar))
785       {
786         if ('\\' != testChar)
787           throw new MalformedURIException(XMLMessages.createXMLMessage(XMLErrorResources.ER_PATH_INVALID_CHAR, new Object[]{String.valueOf(testChar)})); //"Path contains invalid character: "
788                                           //+ testChar);
789       }
790 
791       index++;
792     }
793 
794     m_path = p_uriSpec.substring(start, index);
795 
796     // query - starts with ? and up to fragment or end
797     if (testChar == '?')
798     {
799       index++;
800 
801       start = index;
802 
803       while (index < end)
804       {
805         testChar = p_uriSpec.charAt(index);
806 
807         if (testChar == '#')
808         {
809           break;
810         }
811 
812         if (testChar == '%')
813         {
814           if (index + 2 >= end ||!isHex(p_uriSpec.charAt(index + 1))
815                   ||!isHex(p_uriSpec.charAt(index + 2)))
816           {
817             throw new MalformedURIException(
818               "Query string contains invalid escape sequence!");
819           }
820         }
821         else if (!isReservedCharacter(testChar)
822                  &&!isUnreservedCharacter(testChar))
823         {
824           throw new MalformedURIException(
825             "Query string contains invalid character:" + testChar);
826         }
827 
828         index++;
829       }
830 
831       m_queryString = p_uriSpec.substring(start, index);
832     }
833 
834     // fragment - starts with #
835     if (testChar == '#')
836     {
837       index++;
838 
839       start = index;
840 
841       while (index < end)
842       {
843         testChar = p_uriSpec.charAt(index);
844 
845         if (testChar == '%')
846         {
847           if (index + 2 >= end ||!isHex(p_uriSpec.charAt(index + 1))
848                   ||!isHex(p_uriSpec.charAt(index + 2)))
849           {
850             throw new MalformedURIException(
851               "Fragment contains invalid escape sequence!");
852           }
853         }
854         else if (!isReservedCharacter(testChar)
855                  &&!isUnreservedCharacter(testChar))
856         {
857           throw new MalformedURIException(
858             "Fragment contains invalid character:" + testChar);
859         }
860 
861         index++;
862       }
863 
864       m_fragment = p_uriSpec.substring(start, index);
865     }
866   }
867 
868   /**
869    * Get the scheme for this URI.
870    *
871    * @return the scheme for this URI
872    */
873   public String getScheme()
874   {
875     return m_scheme;
876   }
877 
878   /**
879    * Get the scheme-specific part for this URI (everything following the
880    * scheme and the first colon). See RFC 2396 Section 5.2 for spec.
881    *
882    * @return the scheme-specific part for this URI
883    */
884   public String getSchemeSpecificPart()
885   {
886 
887     final StringBuilder schemespec = new StringBuilder();
888 
889     if (m_userinfo != null || m_host != null || m_port != -1)
890     {
891       schemespec.append("//");
892     }
893 
894     if (m_userinfo != null)
895     {
896       schemespec.append(m_userinfo);
897       schemespec.append('@');
898     }
899 
900     if (m_host != null)
901     {
902       schemespec.append(m_host);
903     }
904 
905     if (m_port != -1)
906     {
907       schemespec.append(':');
908       schemespec.append(m_port);
909     }
910 
911     if (m_path != null)
912     {
913       schemespec.append((m_path));
914     }
915 
916     if (m_queryString != null)
917     {
918       schemespec.append('?');
919       schemespec.append(m_queryString);
920     }
921 
922     if (m_fragment != null)
923     {
924       schemespec.append('#');
925       schemespec.append(m_fragment);
926     }
927 
928     return schemespec.toString();
929   }
930 
931   /**
932    * Get the userinfo for this URI.
933    *
934    * @return the userinfo for this URI (null if not specified).
935    */
936   public String getUserinfo()
937   {
938     return m_userinfo;
939   }
940 
941   /**
942    * Get the host for this URI.
943    *
944    * @return the host for this URI (null if not specified).
945    */
946   public String getHost()
947   {
948     return m_host;
949   }
950 
951   /**
952    * Get the port for this URI.
953    *
954    * @return the port for this URI (-1 if not specified).
955    */
956   public int getPort()
957   {
958     return m_port;
959   }
960 
961   /**
962    * Get the path for this URI (optionally with the query string and
963    * fragment).
964    *
965    * @param p_includeQueryString if true (and query string is not null),
966    *                             then a "?" followed by the query string
967    *                             will be appended
968    * @param p_includeFragment if true (and fragment is not null),
969    *                             then a "#" followed by the fragment
970    *                             will be appended
971    *
972    * @return the path for this URI possibly including the query string
973    *         and fragment
974    */
975   public String getPath(boolean p_includeQueryString,
976                         boolean p_includeFragment)
977   {
978 
979     final StringBuilder pathString = new StringBuilder(m_path);
980 
981     if (p_includeQueryString && m_queryString != null)
982     {
983       pathString.append('?');
984       pathString.append(m_queryString);
985     }
986 
987     if (p_includeFragment && m_fragment != null)
988     {
989       pathString.append('#');
990       pathString.append(m_fragment);
991     }
992 
993     return pathString.toString();
994   }
995 
996   /**
997    * Get the path for this URI. Note that the value returned is the path
998    * only and does not include the query string or fragment.
999    *
1000    * @return the path for this URI.
1001    */
1002   public String getPath()
1003   {
1004     return m_path;
1005   }
1006 
1007   /**
1008    * Get the query string for this URI.
1009    *
1010    * @return the query string for this URI. Null is returned if there
1011    *         was no "?" in the URI spec, empty string if there was a
1012    *         "?" but no query string following it.
1013    */
1014   public String getQueryString()
1015   {
1016     return m_queryString;
1017   }
1018 
1019   /**
1020    * Get the fragment for this URI.
1021    *
1022    * @return the fragment for this URI. Null is returned if there
1023    *         was no "#" in the URI spec, empty string if there was a
1024    *         "#" but no fragment following it.
1025    */
1026   public String getFragment()
1027   {
1028     return m_fragment;
1029   }
1030 
1031   /**
1032    * Set the scheme for this URI. The scheme is converted to lowercase
1033    * before it is set.
1034    *
1035    * @param p_scheme the scheme for this URI (cannot be null)
1036    *
1037    * @throws MalformedURIException if p_scheme is not a conformant
1038    *                                  scheme name
1039    */
1040   public void setScheme(String p_scheme) throws MalformedURIException
1041   {
1042 
1043     if (p_scheme == null)
1044     {
1045       throw new MalformedURIException(XMLMessages.createXMLMessage(XMLErrorResources.ER_SCHEME_FROM_NULL_STRING, null)); //"Cannot set scheme from null string!");
1046     }
1047 
1048     if (!isConformantSchemeName(p_scheme))
1049     {
1050       throw new MalformedURIException(XMLMessages.createXMLMessage(XMLErrorResources.ER_SCHEME_NOT_CONFORMANT, null)); //"The scheme is not conformant.");
1051     }
1052 
1053     m_scheme = p_scheme.toLowerCase();
1054   }
1055 
1056   /**
1057    * Set the userinfo for this URI. If a non-null value is passed in and
1058    * the host value is null, then an exception is thrown.
1059    *
1060    * @param p_userinfo the userinfo for this URI
1061    *
1062    * @throws MalformedURIException if p_userinfo contains invalid
1063    *                                  characters
1064    */
1065   public void setUserinfo(String p_userinfo) throws MalformedURIException
1066   {
1067 
1068     if (p_userinfo == null)
1069     {
1070       m_userinfo = null;
1071     }
1072     else
1073     {
1074       if (m_host == null)
1075       {
1076         throw new MalformedURIException(
1077           "Userinfo cannot be set when host is null!");
1078       }
1079 
1080       // userinfo can contain alphanumerics, mark characters, escaped
1081       // and ';',':','&','=','+','$',','
1082       int index = 0;
1083       int end = p_userinfo.length();
1084       char testChar = '\0';
1085 
1086       while (index < end)
1087       {
1088         testChar = p_userinfo.charAt(index);
1089 
1090         if (testChar == '%')
1091         {
1092           if (index + 2 >= end ||!isHex(p_userinfo.charAt(index + 1))
1093                   ||!isHex(p_userinfo.charAt(index + 2)))
1094           {
1095             throw new MalformedURIException(
1096               "Userinfo contains invalid escape sequence!");
1097           }
1098         }
1099         else if (!isUnreservedCharacter(testChar)
1100                  && USERINFO_CHARACTERS.indexOf(testChar) == -1)
1101         {
1102           throw new MalformedURIException(
1103             "Userinfo contains invalid character:" + testChar);
1104         }
1105 
1106         index++;
1107       }
1108     }
1109 
1110     m_userinfo = p_userinfo;
1111   }
1112 
1113   /**
1114    * Set the host for this URI. If null is passed in, the userinfo
1115    * field is also set to null and the port is set to -1.
1116    *
1117    * @param p_host the host for this URI
1118    *
1119    * @throws MalformedURIException if p_host is not a valid IP
1120    *                                  address or DNS hostname.
1121    */
1122   public void setHost(String p_host) throws MalformedURIException
1123   {
1124 
1125     if (p_host == null || p_host.trim().length() == 0)
1126     {
1127       m_host = p_host;
1128       m_userinfo = null;
1129       m_port = -1;
1130     }
1131     else if (!isWellFormedAddress(p_host))
1132     {
1133       throw new MalformedURIException(XMLMessages.createXMLMessage(XMLErrorResources.ER_HOST_ADDRESS_NOT_WELLFORMED, null)); //"Host is not a well formed address!");
1134     }
1135 
1136     m_host = p_host;
1137   }
1138 
1139   /**
1140    * Set the port for this URI. -1 is used to indicate that the port is
1141    * not specified, otherwise valid port numbers are  between 0 and 65535.
1142    * If a valid port number is passed in and the host field is null,
1143    * an exception is thrown.
1144    *
1145    * @param p_port the port number for this URI
1146    *
1147    * @throws MalformedURIException if p_port is not -1 and not a
1148    *                                  valid port number
1149    */
1150   public void setPort(int p_port) throws MalformedURIException
1151   {
1152 
1153     if (p_port >= 0 && p_port <= 65535)
1154     {
1155       if (m_host == null)
1156       {
1157         throw new MalformedURIException(
1158           XMLMessages.createXMLMessage(XMLErrorResources.ER_PORT_WHEN_HOST_NULL, null)); //"Port cannot be set when host is null!");
1159       }
1160     }
1161     else if (p_port != -1)
1162     {
1163       throw new MalformedURIException(XMLMessages.createXMLMessage(XMLErrorResources.ER_INVALID_PORT, null)); //"Invalid port number!");
1164     }
1165 
1166     m_port = p_port;
1167   }
1168 
1169   /**
1170    * Set the path for this URI. If the supplied path is null, then the
1171    * query string and fragment are set to null as well. If the supplied
1172    * path includes a query string and/or fragment, these fields will be
1173    * parsed and set as well. Note that, for URIs following the "generic
1174    * URI" syntax, the path specified should start with a slash.
1175    * For URIs that do not follow the generic URI syntax, this method
1176    * sets the scheme-specific part.
1177    *
1178    * @param p_path the path for this URI (may be null)
1179    *
1180    * @throws MalformedURIException if p_path contains invalid
1181    *                                  characters
1182    */
1183   public void setPath(String p_path) throws MalformedURIException
1184   {
1185 
1186     if (p_path == null)
1187     {
1188       m_path = null;
1189       m_queryString = null;
1190       m_fragment = null;
1191     }
1192     else
1193     {
1194       initializePath(p_path);
1195     }
1196   }
1197 
1198   /**
1199    * Append to the end of the path of this URI. If the current path does
1200    * not end in a slash and the path to be appended does not begin with
1201    * a slash, a slash will be appended to the current path before the
1202    * new segment is added. Also, if the current path ends in a slash
1203    * and the new segment begins with a slash, the extra slash will be
1204    * removed before the new segment is appended.
1205    *
1206    * @param p_addToPath the new segment to be added to the current path
1207    *
1208    * @throws MalformedURIException if p_addToPath contains syntax
1209    *                                  errors
1210    */
1211   public void appendPath(String p_addToPath) throws MalformedURIException
1212   {
1213 
1214     if (p_addToPath == null || p_addToPath.trim().length() == 0)
1215     {
1216       return;
1217     }
1218 
1219     if (!isURIString(p_addToPath))
1220     {
1221       throw new MalformedURIException(XMLMessages.createXMLMessage(XMLErrorResources.ER_PATH_INVALID_CHAR, new Object[]{p_addToPath})); //"Path contains invalid character!");
1222     }
1223 
1224     if (m_path == null || m_path.trim().length() == 0)
1225     {
1226       if (p_addToPath.startsWith("/"))
1227       {
1228         m_path = p_addToPath;
1229       }
1230       else
1231       {
1232         m_path = "/" + p_addToPath;
1233       }
1234     }
1235     else if (m_path.endsWith("/"))
1236     {
1237       if (p_addToPath.startsWith("/"))
1238       {
1239         m_path = m_path.concat(p_addToPath.substring(1));
1240       }
1241       else
1242       {
1243         m_path = m_path.concat(p_addToPath);
1244       }
1245     }
1246     else
1247     {
1248       if (p_addToPath.startsWith("/"))
1249       {
1250         m_path = m_path.concat(p_addToPath);
1251       }
1252       else
1253       {
1254         m_path = m_path.concat("/" + p_addToPath);
1255       }
1256     }
1257   }
1258 
1259   /**
1260    * Set the query string for this URI. A non-null value is valid only
1261    * if this is an URI conforming to the generic URI syntax and
1262    * the path value is not null.
1263    *
1264    * @param p_queryString the query string for this URI
1265    *
1266    * @throws MalformedURIException if p_queryString is not null and this
1267    *                                  URI does not conform to the generic
1268    *                                  URI syntax or if the path is null
1269    */
1270   public void setQueryString(String p_queryString)
1271           throws MalformedURIException
1272   {
1273 
1274     if (p_queryString == null)
1275     {
1276       m_queryString = null;
1277     }
1278     else if (!isGenericURI())
1279     {
1280       throw new MalformedURIException(
1281         "Query string can only be set for a generic URI!");
1282     }
1283     else if (getPath() == null)
1284     {
1285       throw new MalformedURIException(
1286         "Query string cannot be set when path is null!");
1287     }
1288     else if (!isURIString(p_queryString))
1289     {
1290       throw new MalformedURIException(
1291         "Query string contains invalid character!");
1292     }
1293     else
1294     {
1295       m_queryString = p_queryString;
1296     }
1297   }
1298 
1299   /**
1300    * Set the fragment for this URI. A non-null value is valid only
1301    * if this is a URI conforming to the generic URI syntax and
1302    * the path value is not null.
1303    *
1304    * @param p_fragment the fragment for this URI
1305    *
1306    * @throws MalformedURIException if p_fragment is not null and this
1307    *                                  URI does not conform to the generic
1308    *                                  URI syntax or if the path is null
1309    */
1310   public void setFragment(String p_fragment) throws MalformedURIException
1311   {
1312 
1313     if (p_fragment == null)
1314     {
1315       m_fragment = null;
1316     }
1317     else if (!isGenericURI())
1318     {
1319       throw new MalformedURIException(
1320         XMLMessages.createXMLMessage(XMLErrorResources.ER_FRAG_FOR_GENERIC_URI, null)); //"Fragment can only be set for a generic URI!");
1321     }
1322     else if (getPath() == null)
1323     {
1324       throw new MalformedURIException(
1325         XMLMessages.createXMLMessage(XMLErrorResources.ER_FRAG_WHEN_PATH_NULL, null)); //"Fragment cannot be set when path is null!");
1326     }
1327     else if (!isURIString(p_fragment))
1328     {
1329       throw new MalformedURIException(XMLMessages.createXMLMessage(XMLErrorResources.ER_FRAG_INVALID_CHAR, null)); //"Fragment contains invalid character!");
1330     }
1331     else
1332     {
1333       m_fragment = p_fragment;
1334     }
1335   }
1336 
1337   /**
1338    * Determines if the passed-in Object is equivalent to this URI.
1339    *
1340    * @param p_test the Object to test for equality.
1341    *
1342    * @return true if p_test is a URI with all values equal to this
1343    *         URI, false otherwise
1344    */
1345   @Override
1346   public boolean equals(Object p_test)
1347   {
1348 
1349     if (p_test instanceof URI)
1350     {
1351       URI testURI = (URI) p_test;
1352 
1353       if (((m_scheme == null && testURI.m_scheme == null) || (m_scheme != null && testURI.m_scheme != null && m_scheme.equals(
1354               testURI.m_scheme))) && ((m_userinfo == null && testURI.m_userinfo == null) || (m_userinfo != null && testURI.m_userinfo != null && m_userinfo.equals(
1355               testURI.m_userinfo))) && ((m_host == null && testURI.m_host == null) || (m_host != null && testURI.m_host != null && m_host.equals(
1356               testURI.m_host))) && m_port == testURI.m_port && ((m_path == null && testURI.m_path == null) || (m_path != null && testURI.m_path != null && m_path.equals(
1357               testURI.m_path))) && ((m_queryString == null && testURI.m_queryString == null) || (m_queryString != null && testURI.m_queryString != null && m_queryString.equals(
1358               testURI.m_queryString))) && ((m_fragment == null && testURI.m_fragment == null) || (m_fragment != null && testURI.m_fragment != null && m_fragment.equals(
1359               testURI.m_fragment))))
1360       {
1361         return true;
1362       }
1363     }
1364 
1365     return false;
1366   }
1367 
1368   @Override
1369   public int hashCode() {
1370     int hash = 7;
1371     hash = 59 * hash + Objects.hashCode(this.m_scheme);
1372     hash = 59 * hash + Objects.hashCode(this.m_userinfo);
1373     hash = 59 * hash + Objects.hashCode(this.m_host);
1374     hash = 59 * hash + this.m_port;
1375     hash = 59 * hash + Objects.hashCode(this.m_path);
1376     hash = 59 * hash + Objects.hashCode(this.m_queryString);
1377     hash = 59 * hash + Objects.hashCode(this.m_fragment);
1378     return hash;
1379   }
1380 
1381   /**
1382    * Get the URI as a string specification. See RFC 2396 Section 5.2.
1383    *
1384    * @return the URI string specification
1385    */
1386   @Override
1387   public String toString()
1388   {
1389 
1390     final StringBuilder uriSpecString = new StringBuilder();
1391 
1392     if (m_scheme != null)
1393     {
1394       uriSpecString.append(m_scheme);
1395       uriSpecString.append(':');
1396     }
1397 
1398     uriSpecString.append(getSchemeSpecificPart());
1399 
1400     return uriSpecString.toString();
1401   }
1402 
1403   /**
1404    * Get the indicator as to whether this URI uses the "generic URI"
1405    * syntax.
1406    *
1407    * @return true if this URI uses the "generic URI" syntax, false
1408    *         otherwise
1409    */
1410   public boolean isGenericURI()
1411   {
1412 
1413     // presence of the host (whether valid or empty) means
1414     // double-slashes which means generic uri
1415     return (m_host != null);
1416   }
1417 
1418   /**
1419    * Determine whether a scheme conforms to the rules for a scheme name.
1420    * A scheme is conformant if it starts with an alphanumeric, and
1421    * contains only alphanumerics, '+','-' and '.'.
1422    *
1423    *
1424    * @param p_scheme The sheme name to check
1425    * @return true if the scheme is conformant, false otherwise
1426    */
1427   public static boolean isConformantSchemeName(String p_scheme)
1428   {
1429 
1430     if (p_scheme == null || p_scheme.trim().length() == 0)
1431     {
1432       return false;
1433     }
1434 
1435     if (!isAlpha(p_scheme.charAt(0)))
1436     {
1437       return false;
1438     }
1439 
1440     char testChar;
1441 
1442     for (int i = 1; i < p_scheme.length(); i++)
1443     {
1444       testChar = p_scheme.charAt(i);
1445 
1446       if (!isAlphanum(testChar) && SCHEME_CHARACTERS.indexOf(testChar) == -1)
1447       {
1448         return false;
1449       }
1450     }
1451 
1452     return true;
1453   }
1454 
1455   /**
1456    * Determine whether a string is syntactically capable of representing
1457    * a valid IPv4 address or the domain name of a network host. A valid
1458    * IPv4 address consists of four decimal digit groups separated by a
1459    * '.'. A hostname consists of domain labels (each of which must
1460    * begin and end with an alphanumeric but may contain '-') separated
1461    * & by a '.'. See RFC 2396 Section 3.2.2.
1462    *
1463    *
1464    * @param p_address The address string to check
1465    * @return true if the string is a syntactically valid IPv4 address
1466    *              or hostname
1467    */
1468   public static boolean isWellFormedAddress(String p_address)
1469   {
1470 
1471     if (p_address == null)
1472     {
1473       return false;
1474     }
1475 
1476     String address = p_address.trim();
1477     int addrLength = address.length();
1478 
1479     if (addrLength == 0 || addrLength > 255)
1480     {
1481       return false;
1482     }
1483 
1484     if (address.startsWith(".") || address.startsWith("-"))
1485     {
1486       return false;
1487     }
1488 
1489     // rightmost domain label starting with digit indicates IP address
1490     // since top level domain label can only start with an alpha
1491     // see RFC 2396 Section 3.2.2
1492     int index = address.lastIndexOf('.');
1493 
1494     if (address.endsWith("."))
1495     {
1496       index = address.substring(0, index).lastIndexOf('.');
1497     }
1498 
1499     if (index + 1 < addrLength && isDigit(p_address.charAt(index + 1)))
1500     {
1501       char testChar;
1502       int numDots = 0;
1503 
1504       // make sure that 1) we see only digits and dot separators, 2) that
1505       // any dot separator is preceded and followed by a digit and
1506       // 3) that we find 3 dots
1507       for (int i = 0; i < addrLength; i++)
1508       {
1509         testChar = address.charAt(i);
1510 
1511         if (testChar == '.')
1512         {
1513           if (!isDigit(address.charAt(i - 1))
1514                   || (i + 1 < addrLength &&!isDigit(address.charAt(i + 1))))
1515           {
1516             return false;
1517           }
1518 
1519           numDots++;
1520         }
1521         else if (!isDigit(testChar))
1522         {
1523           return false;
1524         }
1525       }
1526 
1527       if (numDots != 3)
1528       {
1529         return false;
1530       }
1531     }
1532     else
1533     {
1534 
1535       // domain labels can contain alphanumerics and '-"
1536       // but must start and end with an alphanumeric
1537       char testChar;
1538 
1539       for (int i = 0; i < addrLength; i++)
1540       {
1541         testChar = address.charAt(i);
1542 
1543         if (testChar == '.')
1544         {
1545           if (!isAlphanum(address.charAt(i - 1)))
1546           {
1547             return false;
1548           }
1549 
1550           if (i + 1 < addrLength &&!isAlphanum(address.charAt(i + 1)))
1551           {
1552             return false;
1553           }
1554         }
1555         else if (!isAlphanum(testChar) && testChar != '-')
1556         {
1557           return false;
1558         }
1559       }
1560     }
1561 
1562     return true;
1563   }
1564 
1565   /**
1566    * Determine whether a char is a digit.
1567    *
1568    *
1569    * @param p_char the character to check
1570    * @return true if the char is betweeen '0' and '9', false otherwise
1571    */
1572   private static boolean isDigit(char p_char)
1573   {
1574     return p_char >= '0' && p_char <= '9';
1575   }
1576 
1577   /**
1578    * Determine whether a character is a hexadecimal character.
1579    *
1580    *
1581    * @param p_char the character to check
1582    * @return true if the char is betweeen '0' and '9', 'a' and 'f'
1583    *         or 'A' and 'F', false otherwise
1584    */
1585   private static boolean isHex(char p_char)
1586   {
1587     return (isDigit(p_char) || (p_char >= 'a' && p_char <= 'f')
1588             || (p_char >= 'A' && p_char <= 'F'));
1589   }
1590 
1591   /**
1592    * Determine whether a char is an alphabetic character: a-z or A-Z
1593    *
1594    *
1595    * @param p_char the character to check
1596    * @return true if the char is alphabetic, false otherwise
1597    */
1598   private static boolean isAlpha(char p_char)
1599   {
1600     return ((p_char >= 'a' && p_char <= 'z')
1601             || (p_char >= 'A' && p_char <= 'Z'));
1602   }
1603 
1604   /**
1605    * Determine whether a char is an alphanumeric: 0-9, a-z or A-Z
1606    *
1607    *
1608    * @param p_char the character to check
1609    * @return true if the char is alphanumeric, false otherwise
1610    */
1611   private static boolean isAlphanum(char p_char)
1612   {
1613     return (isAlpha(p_char) || isDigit(p_char));
1614   }
1615 
1616   /**
1617    * Determine whether a character is a reserved character:
1618    * ';', '/', '?', ':', '@', '&', '=', '+', '$' or ','
1619    *
1620    *
1621    * @param p_char the character to check
1622    * @return true if the string contains any reserved characters
1623    */
1624   private static boolean isReservedCharacter(char p_char)
1625   {
1626     return RESERVED_CHARACTERS.indexOf(p_char) != -1;
1627   }
1628 
1629   /**
1630    * Determine whether a char is an unreserved character.
1631    *
1632    *
1633    * @param p_char the character to check
1634    * @return true if the char is unreserved, false otherwise
1635    */
1636   private static boolean isUnreservedCharacter(char p_char)
1637   {
1638     return (isAlphanum(p_char) || MARK_CHARACTERS.indexOf(p_char) != -1);
1639   }
1640 
1641   /**
1642    * Determine whether a given string contains only URI characters (also
1643    * called "uric" in RFC 2396). uric consist of all reserved
1644    * characters, unreserved characters and escaped characters.
1645    *
1646    *
1647    * @param p_uric URI string
1648    * @return true if the string is comprised of uric, false otherwise
1649    */
1650   private static boolean isURIString(String p_uric)
1651   {
1652 
1653     if (p_uric == null)
1654     {
1655       return false;
1656     }
1657 
1658     int end = p_uric.length();
1659     char testChar = '\0';
1660 
1661     for (int i = 0; i < end; i++)
1662     {
1663       testChar = p_uric.charAt(i);
1664 
1665       if (testChar == '%')
1666       {
1667         if (i + 2 >= end ||!isHex(p_uric.charAt(i + 1))
1668                 ||!isHex(p_uric.charAt(i + 2)))
1669         {
1670           return false;
1671         }
1672         else
1673         {
1674           i += 2;
1675 
1676           continue;
1677         }
1678       }
1679 
1680       if (isReservedCharacter(testChar) || isUnreservedCharacter(testChar))
1681       {
1682         continue;
1683       }
1684       else
1685       {
1686         return false;
1687       }
1688     }
1689 
1690     return true;
1691   }
1692 }