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1   /*
2    * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
3    * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4    *
5    * This code is free software; you can redistribute it and/or modify it
6    * under the terms of the GNU General Public License version 2 only, as
7    * published by the Free Software Foundation.  Oracle designates this
8    * particular file as subject to the "Classpath" exception as provided
9    * by Oracle in the LICENSE file that accompanied this code.
10   *
11   * This code is distributed in the hope that it will be useful, but WITHOUT
12   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14   * version 2 for more details (a copy is included in the LICENSE file that
15   * accompanied this code).
16   *
17   * You should have received a copy of the GNU General Public License version
18   * 2 along with this work; if not, write to the Free Software Foundation,
19   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20   *
21   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22   * or visit www.oracle.com if you need additional information or have any
23   * questions.
24   */
25  
26  package com.sun.tools.internal.xjc.reader.internalizer;
27  
28  import javax.xml.XMLConstants;
29  
30  import org.xml.sax.Attributes;
31  import org.xml.sax.SAXException;
32  import org.xml.sax.SAXNotRecognizedException;
33  import org.xml.sax.SAXNotSupportedException;
34  import org.xml.sax.XMLReader;
35  import org.xml.sax.helpers.AttributesImpl;
36  import org.xml.sax.helpers.XMLFilterImpl;
37  
38  /**
39   * {@link XMLReader} filter for supporting
40   * <tt>http://xml.org/sax/features/namespace-prefixes</tt> feature.
41   *
42   * @author Kohsuke Kawaguchi
43   */
44  final class ContentHandlerNamespacePrefixAdapter extends XMLFilterImpl {
45      /**
46       * True if <tt>http://xml.org/sax/features/namespace-prefixes</tt> is set to true.
47       */
48      private boolean namespacePrefixes = false;
49  
50      private String[] nsBinding = new String[8];
51      private int len;
52  
53      public ContentHandlerNamespacePrefixAdapter() {
54      }
55  
56      public ContentHandlerNamespacePrefixAdapter(XMLReader parent) {
57          setParent(parent);
58      }
59  
60      @Override
61      public boolean getFeature(String name) throws SAXNotRecognizedException, SAXNotSupportedException {
62          if(name.equals(PREFIX_FEATURE))
63              return namespacePrefixes;
64          return super.getFeature(name);
65      }
66  
67      @Override
68      public void setFeature(String name, boolean value) throws SAXNotRecognizedException, SAXNotSupportedException {
69          if(name.equals(PREFIX_FEATURE)) {
70              this.namespacePrefixes = value;
71              return;
72          }
73          if(name.equals(NAMESPACE_FEATURE) && value)
74              return;
75          super.setFeature(name, value);
76      }
77  
78  
79      @Override
80      public void startPrefixMapping(String prefix, String uri) throws SAXException {
81          if (XMLConstants.XML_NS_URI.equals(uri)) return; //xml prefix shall not be declared based on jdk api javadoc
82          if(len==nsBinding.length) {
83              // reallocate
84              String[] buf = new String[nsBinding.length*2];
85              System.arraycopy(nsBinding,0,buf,0,nsBinding.length);
86              nsBinding = buf;
87          }
88          nsBinding[len++] = prefix;
89          nsBinding[len++] = uri;
90          super.startPrefixMapping(prefix,uri);
91      }
92  
93      @Override
94      public void startElement(String uri, String localName, String qName, Attributes atts) throws SAXException {
95          if(namespacePrefixes) {
96              this.atts.setAttributes(atts);
97              // add namespace bindings back as attributes
98              for( int i=0; i<len; i+=2 ) {
99                  String prefix = nsBinding[i];
100                 if(prefix.length()==0)
101                     this.atts.addAttribute(XMLConstants.XML_NS_URI,"xmlns","xmlns","CDATA",nsBinding[i+1]);
102                 else
103                     this.atts.addAttribute(XMLConstants.XML_NS_URI,prefix,"xmlns:"+prefix,"CDATA",nsBinding[i+1]);
104             }
105             atts = this.atts;
106         }
107         len=0;
108         super.startElement(uri, localName, qName, atts);
109     }
110 
111     private final AttributesImpl atts = new AttributesImpl();
112 
113     private static final String PREFIX_FEATURE = "http://xml.org/sax/features/namespace-prefixes";
114     private static final String NAMESPACE_FEATURE = "http://xml.org/sax/features/namespaces";
115 }