Show DOMReader.java syntax highlighted
/*
* Copyright 2001-2005 (C) MetaStuff, Ltd. All Rights Reserved.
*
* This software is open source.
* See the bottom of this file for the licence.
*/
package org.dom4j.io;
import java.util.ArrayList;
import java.util.List;
import org.dom4j.Branch;
import org.dom4j.Document;
import org.dom4j.DocumentFactory;
import org.dom4j.Element;
import org.dom4j.Namespace;
import org.dom4j.QName;
import org.dom4j.tree.NamespaceStack;
/**
* <p>
* <code>DOMReader</code> navigates a W3C DOM tree and creates a DOM4J tree
* from it.
* </p>
*
* @author <a href="mailto:jstrachan@apache.org">James Strachan </a>
* @version $Revision: 1.1 $
*/
public class DOMReader {
/** <code>DocumentFactory</code> used to create new document objects */
private DocumentFactory factory;
/** stack of <code>Namespace</code> and <code>QName</code> objects */
private NamespaceStack namespaceStack;
public DOMReader() {
this.factory = DocumentFactory.getInstance();
this.namespaceStack = new NamespaceStack(factory);
}
public DOMReader(DocumentFactory factory) {
this.factory = factory;
this.namespaceStack = new NamespaceStack(factory);
}
/**
* DOCUMENT ME!
*
* @return the <code>DocumentFactory</code> used to create document
* objects
*/
public DocumentFactory getDocumentFactory() {
return factory;
}
/**
* <p>
* This sets the <code>DocumentFactory</code> used to create new
* documents. This method allows the building of custom DOM4J tree objects
* to be implemented easily using a custom derivation of
* {@link DocumentFactory}
* </p>
*
* @param docFactory
* <code>DocumentFactory</code> used to create DOM4J objects
*/
public void setDocumentFactory(DocumentFactory docFactory) {
this.factory = docFactory;
this.namespaceStack.setDocumentFactory(factory);
}
public Document read(org.w3c.dom.Document domDocument) {
if (domDocument instanceof Document) {
return (Document) domDocument;
}
Document document = createDocument();
clearNamespaceStack();
org.w3c.dom.NodeList nodeList = domDocument.getChildNodes();
for (int i = 0, size = nodeList.getLength(); i < size; i++) {
readTree(nodeList.item(i), document);
}
return document;
}
// Implementation methods
protected void readTree(org.w3c.dom.Node node, Branch current) {
Element element = null;
Document document = null;
if (current instanceof Element) {
element = (Element) current;
} else {
document = (Document) current;
}
switch (node.getNodeType()) {
case org.w3c.dom.Node.ELEMENT_NODE:
readElement(node, current);
break;
case org.w3c.dom.Node.PROCESSING_INSTRUCTION_NODE:
if (current instanceof Element) {
Element currentEl = (Element) current;
currentEl.addProcessingInstruction(node.getNodeName(), node
.getNodeValue());
} else {
Document currentDoc = (Document) current;
currentDoc.addProcessingInstruction(node.getNodeName(),
node.getNodeValue());
}
break;
case org.w3c.dom.Node.COMMENT_NODE:
if (current instanceof Element) {
((Element) current).addComment(node.getNodeValue());
} else {
((Document) current).addComment(node.getNodeValue());
}
break;
case org.w3c.dom.Node.DOCUMENT_TYPE_NODE:
org.w3c.dom.DocumentType domDocType
= (org.w3c.dom.DocumentType) node;
document.addDocType(domDocType.getName(), domDocType
.getPublicId(), domDocType.getSystemId());
break;
case org.w3c.dom.Node.TEXT_NODE:
element.addText(node.getNodeValue());
break;
case org.w3c.dom.Node.CDATA_SECTION_NODE:
element.addCDATA(node.getNodeValue());
break;
case org.w3c.dom.Node.ENTITY_REFERENCE_NODE:
// is there a better way to get the value of an entity?
org.w3c.dom.Node firstChild = node.getFirstChild();
if (firstChild != null) {
element.addEntity(node.getNodeName(), firstChild
.getNodeValue());
} else {
element.addEntity(node.getNodeName(), "");
}
break;
case org.w3c.dom.Node.ENTITY_NODE:
element.addEntity(node.getNodeName(), node.getNodeValue());
break;
default:
System.out.println("WARNING: Unknown DOM node type: "
+ node.getNodeType());
}
}
protected void readElement(org.w3c.dom.Node node, Branch current) {
int previouslyDeclaredNamespaces = namespaceStack.size();
String namespaceUri = node.getNamespaceURI();
String elementPrefix = node.getPrefix();
if (elementPrefix == null) {
elementPrefix = "";
}
org.w3c.dom.NamedNodeMap attributeList = node.getAttributes();
if ((attributeList != null) && (namespaceUri == null)) {
// test if we have an "xmlns" attribute
org.w3c.dom.Node attribute = attributeList.getNamedItem("xmlns");
if (attribute != null) {
namespaceUri = attribute.getNodeValue();
elementPrefix = "";
}
}
QName qName = namespaceStack.getQName(namespaceUri,
node.getLocalName(), node.getNodeName());
Element element = current.addElement(qName);
if (attributeList != null) {
int size = attributeList.getLength();
List attributes = new ArrayList(size);
for (int i = 0; i < size; i++) {
org.w3c.dom.Node attribute = attributeList.item(i);
// Define all namespaces first then process attributes later
String name = attribute.getNodeName();
if (name.startsWith("xmlns")) {
String prefix = getPrefix(name);
String uri = attribute.getNodeValue();
Namespace namespace = namespaceStack.addNamespace(prefix,
uri);
element.add(namespace);
} else {
attributes.add(attribute);
}
}
// now add the attributes, the namespaces should be available
size = attributes.size();
for (int i = 0; i < size; i++) {
org.w3c.dom.Node attribute = (org.w3c.dom.Node) attributes
.get(i);
QName attributeQName = namespaceStack.getQName(attribute
.getNamespaceURI(), attribute.getLocalName(), attribute
.getNodeName());
element.addAttribute(attributeQName, attribute.getNodeValue());
}
}
// Recurse on child nodes
org.w3c.dom.NodeList children = node.getChildNodes();
for (int i = 0, size = children.getLength(); i < size; i++) {
org.w3c.dom.Node child = children.item(i);
readTree(child, element);
}
// pop namespaces from the stack
while (namespaceStack.size() > previouslyDeclaredNamespaces) {
namespaceStack.pop();
}
}
protected Namespace getNamespace(String prefix, String uri) {
return getDocumentFactory().createNamespace(prefix, uri);
}
protected Document createDocument() {
return getDocumentFactory().createDocument();
}
protected void clearNamespaceStack() {
namespaceStack.clear();
if (!namespaceStack.contains(Namespace.XML_NAMESPACE)) {
namespaceStack.push(Namespace.XML_NAMESPACE);
}
}
private String getPrefix(String xmlnsDecl) {
int index = xmlnsDecl.indexOf(':', 5);
if (index != -1) {
return xmlnsDecl.substring(index + 1);
} else {
return "";
}
}
}
/*
* Redistribution and use of this software and associated documentation
* ("Software"), with or without modification, are permitted provided that the
* following conditions are met:
*
* 1. Redistributions of source code must retain copyright statements and
* notices. Redistributions must also contain a copy of this document.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. The name "DOM4J" must not be used to endorse or promote products derived
* from this Software without prior written permission of MetaStuff, Ltd. For
* written permission, please contact dom4j-info@metastuff.com.
*
* 4. Products derived from this Software may not be called "DOM4J" nor may
* "DOM4J" appear in their names without prior written permission of MetaStuff,
* Ltd. DOM4J is a registered trademark of MetaStuff, Ltd.
*
* 5. Due credit should be given to the DOM4J Project - http://www.dom4j.org
*
* THIS SOFTWARE IS PROVIDED BY METASTUFF, LTD. AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL METASTUFF, LTD. OR ITS CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* Copyright 2001-2005 (C) MetaStuff, Ltd. All Rights Reserved.
*/
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