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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 java.io.IOException;
29  
30  import com.sun.xml.internal.xsom.parser.XMLParser;
31  
32  import org.w3c.dom.Document;
33  import org.xml.sax.ContentHandler;
34  import org.xml.sax.EntityResolver;
35  import org.xml.sax.ErrorHandler;
36  import org.xml.sax.InputSource;
37  import org.xml.sax.SAXException;
38  
39  
40  /**
41   * {@link XMLParser} implementation that
42   * parses XML from a DOM forest instead of parsing it from
43   * its original location.
44   *
45   * @author
46   *     Kohsuke Kawaguchi (kohsuke.kawaguchi@sun.com)
47   */
48  class DOMForestParser implements XMLParser {
49  
50      /** DOM forest to be "parsed". */
51      private final DOMForest forest;
52  
53      /** Scanner object will do the actual SAX events generation. */
54      private final DOMForestScanner scanner;
55  
56      private final XMLParser fallbackParser;
57  
58      /**
59       * @param fallbackParser
60       *      This parser will be used when DOMForestParser needs to parse
61       *      documents that are not in the forest.
62       */
63      DOMForestParser( DOMForest forest, XMLParser fallbackParser ) {
64          this.forest = forest;
65          this.scanner = new DOMForestScanner(forest);
66          this.fallbackParser = fallbackParser;
67      }
68  
69      public void parse(
70          InputSource source,
71          ContentHandler contentHandler,
72          ErrorHandler errorHandler,
73          EntityResolver entityResolver )
74          throws SAXException, IOException {
75  
76          String systemId = source.getSystemId();
77          Document dom = forest.get(systemId);
78  
79          if(dom==null) {
80              // if no DOM tree is built for it,
81              // let the fall back parser parse the original document.
82              //
83              // for example, XSOM parses datatypes.xsd (XML Schema part 2)
84              // but this will never be built into the forest.
85              fallbackParser.parse( source, contentHandler, errorHandler, entityResolver );
86              return;
87          }
88  
89          scanner.scan( dom, contentHandler );
90      }
91  }