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1
22 package org.jboss.xb.util;
23
24 import java.util.List  ;
25 import java.util.Collections ;
26 import java.util.ArrayList ;
27 import org.jboss.xb.binding.Constants;
28 import org.jboss.xb.binding.NamespaceRegistry;
29 import org.w3c.dom.Attr ;
30 import org.w3c.dom.Element ;
31 import org.w3c.dom.NamedNodeMap ;
32 import org.w3c.dom.NodeList ;
33 import org.w3c.dom.Node ;
34 import org.xml.sax.ContentHandler ;
35 import org.xml.sax.SAXException ;
36 import org.xml.sax.helpers.AttributesImpl ;
37
38
42 public class Dom2Sax
43 {
44 public static void dom2sax(Element e, ContentHandler ch) throws SAXException
45 {
46 if(e == null)
47 {
48 throw new IllegalArgumentException ("The element argument must not be null!");
49 }
50
51 ch.startDocument();
52
53 process(e, ch, new NamespaceRegistry());
54
55 ch.endDocument();
56 }
57
58 private static void process(Element e, ContentHandler ch, NamespaceRegistry nsReg) throws SAXException
59 {
60 AttributesImpl attrs = new AttributesImpl ();
61
62 List startedPrefixes = Collections.EMPTY_LIST;
63
64 NamedNodeMap domAttrs = e.getAttributes();
65 if(domAttrs != null && domAttrs.getLength() > 0)
66 {
67 for(int i = 0; i < domAttrs.getLength(); ++i)
69 {
70 Attr attr = (Attr )domAttrs.item(i);
71 String attrNs = attr.getNamespaceURI();
72 String attrLocal = attr.getLocalName();
73 if(attrLocal == null)
74 {
75 attrLocal = attr.getNodeName();
76 }
77
78 if(attrNs != null && isXmlns(attrNs))
79 {
80 String prefix;
81 String attrPrefix;
82 if("xmlns".equals(attrLocal))
83 {
84 prefix = "";
85 attrPrefix = "";
86 }
87 else
88 {
89 prefix = attrLocal;
90 attrPrefix = "xmlns";
91 }
92
93 String attrVal = attr.getValue();
94 nsReg.addPrefixMapping(prefix, attrVal);
95 ch.startPrefixMapping(prefix, attrVal);
96 startedPrefixes = add(startedPrefixes, prefix);
97
98 attrs.addAttribute(attrNs, attrLocal, buildQName(attrPrefix, attrLocal), null, attrVal);
99 }
100 }
101
102 for(int i = 0; i < domAttrs.getLength(); ++i)
103 {
104 Attr attr = (Attr )domAttrs.item(i);
105 String attrNs = attr.getNamespaceURI();
106 String attrLocal = attr.getLocalName();
107 if(attrLocal == null)
108 {
109 attrLocal = attr.getNodeName();
110 }
111
112 if(attrNs == null)
113 {
114 attrNs = "";
115 }
116
117 if(!isXmlns(attrNs))
118 {
119 String prefix = nsReg.getPrefix(attrNs);
120 if(prefix == null && attrNs.length() > 0)
121 {
122 prefix = attrLocal + "_ns";
123 nsReg.addPrefixMapping(prefix, attrNs);
124 ch.startPrefixMapping(prefix, attrNs);
125 startedPrefixes = add(startedPrefixes, prefix);
126 attrs.addAttribute(Constants.NS_XML_SCHEMA, prefix, "xmlns:" + prefix, null, attrNs);
127 }
128
129 attrs.addAttribute(attrNs, attrLocal, buildQName(prefix, attrLocal), null, attr.getValue());
130 }
131 }
132 }
133
134 String localName = e.getLocalName();
135 if(localName == null)
136 {
137 localName = e.getNodeName();
138 }
139
140 String ns = e.getNamespaceURI();
141 if(ns == null)
142 {
143 ns = "";
144 }
145
146 String prefix = nsReg.getPrefix(ns);
147 if(prefix == null && ns.length() > 0)
148 {
149 prefix = localName + "_ns";
150 nsReg.addPrefixMapping(prefix, ns);
151 ch.startPrefixMapping(prefix, ns);
152 startedPrefixes = add(startedPrefixes, prefix);
153 attrs.addAttribute(Constants.NS_XML_SCHEMA, prefix, "xmlns:" + prefix, null, ns);
154 }
155
156 String qName = buildQName(prefix, localName);
157 ch.startElement(ns, localName, qName, attrs);
158
159 NodeList childNodes = e.getChildNodes();
160 if(childNodes != null && childNodes.getLength() > 0)
161 {
162 for(int i = 0; i < childNodes.getLength(); ++i)
163 {
164 Node node = childNodes.item(i);
165 switch(node.getNodeType())
166 {
167 case Node.ELEMENT_NODE:
168 process((Element )node, ch, nsReg);
169 break;
170 case Node.CDATA_SECTION_NODE:
171 case Node.TEXT_NODE:
172 String value = node.getNodeValue();
173 ch.characters(value.toCharArray(), 0, value.length());
174 break;
175 case Node.ENTITY_REFERENCE_NODE:
176 String ref = '&' + node.getNodeName() + ';';
177 ch.characters(ref.toCharArray(), 0, ref.length());
178 break;
179 case Node.ENTITY_NODE:
180 ch.skippedEntity(node.getNodeName());
181 break;
182 }
183 }
184 }
185
186 ch.endElement(ns, localName, qName);
187
188 if(startedPrefixes.size() > 0)
189 {
190 for(int i = startedPrefixes.size() - 1; i >= 0; --i)
191 {
192 String pref = (String )startedPrefixes.get(i);
193 nsReg.removePrefixMapping(pref);
194 ch.endPrefixMapping(pref);
195 }
196 }
197 }
198
199 private static boolean isXmlns(String ns)
200 {
201 return ns.startsWith("http://www.w3.org/2000/xmlns");
202 }
203
204 private static String buildQName(String prefix, String localName)
205 {
206 return prefix == null || prefix.length() == 0 ?
207 localName :
208 prefix + ':' + localName;
209 }
210
211 private static List add(List list, Object o)
212 {
213 switch(list.size())
214 {
215 case 0:
216 list = Collections.singletonList(o);
217 break;
218 case 1:
219 list = new ArrayList (list);
220 default:
221 list.add(o);
222 }
223 return list;
224 }
225 }
226 |
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