Show DOMWriter.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.List;
import org.dom4j.Attribute;
import org.dom4j.CDATA;
import org.dom4j.Comment;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.Entity;
import org.dom4j.Namespace;
import org.dom4j.ProcessingInstruction;
import org.dom4j.Text;
import org.dom4j.tree.NamespaceStack;
import org.w3c.dom.DOMImplementation;
/**
* <p>
* <code>DOMWriter</code> takes a DOM4J tree and outputs it as a W3C DOM
* object
* </p>
*
* @author <a href="mailto:james.strachan@metastuff.com">James Strachan </a>
* @version $Revision: 1.1 $
*/
public class DOMWriter {
private static boolean loggedWarning = false;
private static final String[] DEFAULT_DOM_DOCUMENT_CLASSES = {
"org.apache.xerces.dom.DocumentImpl", // Xerces
"gnu.xml.dom.DomDocument", // GNU JAXP
"org.apache.crimson.tree.XmlDocument", // Crimson
"com.sun.xml.tree.XmlDocument", // Sun's Project X
"oracle.xml.parser.v2.XMLDocument", // Oracle V2
"oracle.xml.parser.XMLDocument", // Oracle V1
"org.dom4j.dom.DOMDocument" // Internal DOM implementation
};
// the Class used to create new DOM Document instances
private Class domDocumentClass;
/** stack of <code>Namespace</code> objects */
private NamespaceStack namespaceStack = new NamespaceStack();
public DOMWriter() {
}
public DOMWriter(Class domDocumentClass) {
this.domDocumentClass = domDocumentClass;
}
public Class getDomDocumentClass() throws DocumentException {
Class result = domDocumentClass;
if (result == null) {
// lets try and find one in the classpath
int size = DEFAULT_DOM_DOCUMENT_CLASSES.length;
for (int i = 0; i < size; i++) {
try {
String name = DEFAULT_DOM_DOCUMENT_CLASSES[i];
result = Class.forName(name, true, DOMWriter.class
.getClassLoader());
if (result != null) {
break;
}
} catch (Exception e) {
// could not load class correctly
// lets carry on to the next one
}
}
}
return result;
}
/**
* Sets the DOM {@link org.w3c.dom.Document}implementation class used by
* the writer when creating DOM documents.
*
* @param domDocumentClass
* is the Class implementing the {@linkorg.w3c.dom.Document}
* interface
*/
public void setDomDocumentClass(Class domDocumentClass) {
this.domDocumentClass = domDocumentClass;
}
/**
* Sets the DOM {@link org.w3c.dom.Document}implementation class name used
* by the writer when creating DOM documents.
*
* @param name
* is the name of the Class implementing the {@link
* org.w3c.dom.Document} interface
*
* @throws DocumentException
* if the class could not be loaded
*/
public void setDomDocumentClassName(String name) throws DocumentException {
try {
this.domDocumentClass = Class.forName(name, true, DOMWriter.class
.getClassLoader());
} catch (Exception e) {
throw new DocumentException("Could not load the DOM Document "
+ "class: " + name, e);
}
}
public org.w3c.dom.Document write(Document document)
throws DocumentException {
if (document instanceof org.w3c.dom.Document) {
return (org.w3c.dom.Document) document;
}
resetNamespaceStack();
org.w3c.dom.Document domDocument = createDomDocument(document);
appendDOMTree(domDocument, domDocument, document.content());
namespaceStack.clear();
return domDocument;
}
public org.w3c.dom.Document write(Document document,
org.w3c.dom.DOMImplementation domImpl) throws DocumentException {
if (document instanceof org.w3c.dom.Document) {
return (org.w3c.dom.Document) document;
}
resetNamespaceStack();
org.w3c.dom.Document domDocument = createDomDocument(document, domImpl);
appendDOMTree(domDocument, domDocument, document.content());
namespaceStack.clear();
return domDocument;
}
protected void appendDOMTree(org.w3c.dom.Document domDocument,
org.w3c.dom.Node domCurrent, List content) {
int size = content.size();
for (int i = 0; i < size; i++) {
Object object = content.get(i);
if (object instanceof Element) {
appendDOMTree(domDocument, domCurrent, (Element) object);
} else if (object instanceof String) {
appendDOMTree(domDocument, domCurrent, (String) object);
} else if (object instanceof Text) {
Text text = (Text) object;
appendDOMTree(domDocument, domCurrent, text.getText());
} else if (object instanceof CDATA) {
appendDOMTree(domDocument, domCurrent, (CDATA) object);
} else if (object instanceof Comment) {
appendDOMTree(domDocument, domCurrent, (Comment) object);
} else if (object instanceof Entity) {
appendDOMTree(domDocument, domCurrent, (Entity) object);
} else if (object instanceof ProcessingInstruction) {
appendDOMTree(domDocument, domCurrent,
(ProcessingInstruction) object);
}
}
}
protected void appendDOMTree(org.w3c.dom.Document domDocument,
org.w3c.dom.Node domCurrent, Element element) {
String elUri = element.getNamespaceURI();
String elName = element.getQualifiedName();
org.w3c.dom.Element domElement = domDocument.createElementNS(elUri,
elName);
int stackSize = namespaceStack.size();
// add the namespace of the element first
Namespace elementNamespace = element.getNamespace();
if (isNamespaceDeclaration(elementNamespace)) {
namespaceStack.push(elementNamespace);
writeNamespace(domElement, elementNamespace);
}
// add the additional declared namespaces
List declaredNamespaces = element.declaredNamespaces();
for (int i = 0, size = declaredNamespaces.size(); i < size; i++) {
Namespace namespace = (Namespace) declaredNamespaces.get(i);
if (isNamespaceDeclaration(namespace)) {
namespaceStack.push(namespace);
writeNamespace(domElement, namespace);
}
}
// add the attributes
for (int i = 0, size = element.attributeCount(); i < size; i++) {
Attribute attribute = (Attribute) element.attribute(i);
String attUri = attribute.getNamespaceURI();
String attName = attribute.getQualifiedName();
String value = attribute.getValue();
domElement.setAttributeNS(attUri, attName, value);
}
// add content
appendDOMTree(domDocument, domElement, element.content());
domCurrent.appendChild(domElement);
while (namespaceStack.size() > stackSize) {
namespaceStack.pop();
}
}
protected void appendDOMTree(org.w3c.dom.Document domDocument,
org.w3c.dom.Node domCurrent, CDATA cdata) {
org.w3c.dom.CDATASection domCDATA = domDocument
.createCDATASection(cdata.getText());
domCurrent.appendChild(domCDATA);
}
protected void appendDOMTree(org.w3c.dom.Document domDocument,
org.w3c.dom.Node domCurrent, Comment comment) {
org.w3c.dom.Comment domComment = domDocument.createComment(comment
.getText());
domCurrent.appendChild(domComment);
}
protected void appendDOMTree(org.w3c.dom.Document domDocument,
org.w3c.dom.Node domCurrent, String text) {
org.w3c.dom.Text domText = domDocument.createTextNode(text);
domCurrent.appendChild(domText);
}
protected void appendDOMTree(org.w3c.dom.Document domDocument,
org.w3c.dom.Node domCurrent, Entity entity) {
org.w3c.dom.EntityReference domEntity = domDocument
.createEntityReference(entity.getName());
domCurrent.appendChild(domEntity);
}
protected void appendDOMTree(org.w3c.dom.Document domDoc,
org.w3c.dom.Node domCurrent, ProcessingInstruction pi) {
org.w3c.dom.ProcessingInstruction domPI = domDoc
.createProcessingInstruction(pi.getTarget(), pi.getText());
domCurrent.appendChild(domPI);
}
protected void writeNamespace(org.w3c.dom.Element domElement,
Namespace namespace) {
String attributeName = attributeNameForNamespace(namespace);
// domElement.setAttributeNS("", attributeName, namespace.getURI());
domElement.setAttribute(attributeName, namespace.getURI());
}
protected String attributeNameForNamespace(Namespace namespace) {
String xmlns = "xmlns";
String prefix = namespace.getPrefix();
if (prefix.length() > 0) {
return xmlns + ":" + prefix;
}
return xmlns;
}
protected org.w3c.dom.Document createDomDocument(Document document)
throws DocumentException {
org.w3c.dom.Document result = null;
// use the given domDocumentClass (if not null)
if (domDocumentClass != null) {
try {
result = (org.w3c.dom.Document) domDocumentClass.newInstance();
} catch (Exception e) {
throw new DocumentException(
"Could not instantiate an instance "
+ "of DOM Document with class: "
+ domDocumentClass.getName(), e);
}
} else {
// lets try JAXP first before using the hardcoded default parsers
result = createDomDocumentViaJAXP();
if (result == null) {
Class theClass = getDomDocumentClass();
try {
result = (org.w3c.dom.Document) theClass.newInstance();
} catch (Exception e) {
throw new DocumentException("Could not instantiate an "
+ "instance of DOM Document " + "with class: "
+ theClass.getName(), e);
}
}
}
return result;
}
protected org.w3c.dom.Document createDomDocumentViaJAXP()
throws DocumentException {
try {
return JAXPHelper.createDocument(false, true);
} catch (Throwable e) {
if (!loggedWarning) {
loggedWarning = true;
if (SAXHelper.isVerboseErrorReporting()) {
// log all exceptions as warnings and carry
// on as we have a default SAX parser we can use
System.out.println("Warning: Caught exception attempting "
+ "to use JAXP to create a W3C DOM " + "document");
System.out.println("Warning: Exception was: " + e);
e.printStackTrace();
} else {
System.out.println("Warning: Error occurred using JAXP to "
+ "create a DOM document.");
}
}
}
return null;
}
protected org.w3c.dom.Document createDomDocument(Document document,
DOMImplementation domImpl) throws DocumentException {
String namespaceURI = null;
String qualifiedName = null;
org.w3c.dom.DocumentType docType = null;
return domImpl.createDocument(namespaceURI, qualifiedName, docType);
}
protected boolean isNamespaceDeclaration(Namespace ns) {
if ((ns != null) && (ns != Namespace.NO_NAMESPACE)
&& (ns != Namespace.XML_NAMESPACE)) {
String uri = ns.getURI();
if ((uri != null) && (uri.length() > 0)) {
if (!namespaceStack.contains(ns)) {
return true;
}
}
}
return false;
}
protected void resetNamespaceStack() {
namespaceStack.clear();
namespaceStack.push(Namespace.XML_NAMESPACE);
}
}
/*
* 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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