XMLFactory


1   /*
2    * $Id: XMLFactory.java,v 1.3 2002/03/22 19:08:58 awason Exp $
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6    * The JGenerator Software License, Version 1.0
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11   * modification, are permitted provided that the following conditions are met:
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23   *    "This product includes software developed by Dmitry Skavish
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50  
51  package org.openlaszlo.iv.flash.xml;
52  
53  import org.openlaszlo.iv.flash.context.*;
54  
55  import org.openlaszlo.iv.flash.util.*;
56  
57  import javax.xml.parsers.*;
58  import java.lang.reflect.*;
59  import org.w3c.dom.Node  ;
60  
61  /**
62   * XML Factory
63   *
64   * @author Dmitry Skavish
65   */
66  public abstract class XMLFactory {
67  
68      private static XMLFactory instance;
69  
70      /**
71       * Returns implementation specific DocumentBuilder
72       *
73       * @return implementation specific DocumentBuilder
74       * @exception ParserConfigurationException
75       */
76      public abstract DocumentBuilder getDocumentBuilder() throws ParserConfigurationException;
77  
78      /**
79       * Creates new implementation specific XMLContext
80       *
81       * @param parent parent context
82       * @param node   node representing the created context
83       * @return implementation specific XMLContext
84       */
85      public abstract XMLContext newXMLContext( Context parent, Node   node );
86  
87      /**
88       * Returns implementation specific XPathProcessor
89       *
90       * @return implementation specific XPathProcessor
91       */
92      public abstract XPathProcessor getXPathProcessor();
93  
94      /**
95       * Returns implementation specific instance of XMLFactory
96       *
97       * @return implementation specific instance of XMLFactory
98       */
99      public static XMLFactory getFactory() {
100         return instance;
101     }
102 
103     static {
104         DocumentBuilderFactory docFactory = null;
105 
106         String   factoryName = PropertyManager.getProperty("javax.xml.parsers.DocumentBuilderFactory", null);
107         if( factoryName != null ) {
108             try {
109                 Class   clazz = Class.forName(factoryName);
110                 docFactory = (DocumentBuilderFactory) clazz.newInstance();
111             } catch( Exception   e ) {
112             }
113         }
114 
115         if( docFactory == null ) {
116             try {
117                 docFactory = DocumentBuilderFactory.newInstance();
118             } catch( RuntimeException   e ) {
119             }
120             if (docFactory == null) {
121                 try {
122                     Class   clazz = Class.forName("org.openlaszlo.iv.flash.xml.apache.DocumentBuilderFactoryImpl");
123                     docFactory = (DocumentBuilderFactory) clazz.newInstance();
124                 } catch( Exception   e ) {
125                     Log.logRB(e);
126                 }
127             }
128         }
129 
130         if (docFactory != null) {
131 
132             String   name = docFactory.getClass().getName();
133             if( name.startsWith("org.apache.xerces") ) {
134                 // change default apache factory with ours, because default one very strict to errors
135                 try {
136                     Class   clazz = Class.forName("org.openlaszlo.iv.flash.xml.apache.DocumentBuilderFactoryImpl");
137                     DocumentBuilderFactory docFactory2 = (DocumentBuilderFactory) clazz.newInstance();
138                     docFactory = docFactory2;
139                     name = docFactory.getClass().getName();
140                 } catch( Exception   e ) {
141                 }
142             }
143 
144             docFactory.setExpandEntityReferences(false);
145             docFactory.setIgnoringComments(true);
146             docFactory.setNamespaceAware(true);
147             docFactory.setValidating(false);
148 
149             // Use XML factory if specified
150             String   xmlFactoryName = PropertyManager.getProperty("org.openlaszlo.iv.flash.XMLFactory", null);
151             if (xmlFactoryName != null) {
152                 try {
153                     instance = constructFactory(xmlFactoryName, docFactory);
154                 } catch( Exception   e ) {
155                     Log.logRB(e);
156                 }
157             }
158             // Otherwise find a factory to match the DocumentBuilderFactory
159             else if( name.startsWith("org.openlaszlo.iv.flash.xml.apache.") ) {
160                 try {
161                     instance = constructFactory("org.openlaszlo.iv.flash.xml.apache.XMLFactoryImpl", docFactory);
162                 } catch( Exception   e ) {
163                     Log.logRB(e);
164                 }
165             } else if( name.startsWith("com.caucho.") ) {
166                 // instance = new org.openlaszlo.iv.flash.xml.caucho.XMLFactoryImpl(docFactory);
167                 try {
168                     instance = constructFactory("org.openlaszlo.iv.flash.xml.caucho.XMLFactoryImpl", docFactory);
169                 } catch( Exception   e ) {
170                     Log.logRB(e);
171                 }
172             } else {
173                 instance = new org.openlaszlo.iv.flash.xml.generic.XMLFactoryImpl(docFactory);
174             }
175         }
176     }
177 
178     private static XMLFactory constructFactory(String   factoryName, DocumentBuilderFactory docFactory) throws Exception   {
179         Class   factory = Class.forName(factoryName);
180         Constructor constr = factory.getConstructor(new Class  [] {DocumentBuilderFactory.class});
181         return (XMLFactory) constr.newInstance(new Object  [] {docFactory});
182     }
183 }
184 
185 
186
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