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package com.sun.enterprise.jbi.serviceengine.util;
import java.util.HashMap;
import javax.xml.stream.XMLStreamWriter;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.Text;
import java.io.Writer;
import java.util.ArrayList;
import java.util.Map;
import javax.xml.stream.XMLStreamReader;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.Attr;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.ProcessingInstruction;
/**
* This object provides utility methods to manipulate DOM tree.
*
* @author bhavanishankar@dev.java.net.
*/
public class DOMUtil {
/**
* static object to access the methods of this object.
*/
public static final DOMUtil UTIL = new DOMUtil();
/**
* Creates a new instance of DOMUtil.
*/
public DOMUtil() {
}
/**
* Writes namespace attributes and other attributes from the current node
* of the reader to the current node of the writer.
*
* @param reader XMLStreamReader pointing to a START_ELEMENT.
* @param writer XMLStreamWriter pointing to a START_ELEMENT.
*/
void writeAttributes(XMLStreamReader reader, XMLStreamWriter writer)
throws Exception {
int namespaceCount = reader.getNamespaceCount();
int attributeCount = reader.getAttributeCount();
for(int i=0; i<namespaceCount; i++) {
writer.writeNamespace(reader.getNamespacePrefix(i),
reader.getNamespaceURI(i));
}
for(int i=0; i<attributeCount; i++) {
String attrNs = reader.getAttributeNamespace(i);
if(attrNs != null) {
writer.writeAttribute(attrNs,
reader.getAttributeLocalName(i),
reader.getAttributeValue(i));
} else {
writer.writeAttribute(reader.getAttributeLocalName(i),
reader.getAttributeValue(i));
}
}
}
private void writeAncestorNamespaceAttrs(
XMLStreamReader reader,
XMLStreamWriter writer,
Map<String,String> ancestorNamespaceAttrs) {
try {
String prefix = reader.getPrefix();
String namespace = ancestorNamespaceAttrs.remove(prefix);
if(namespace != null) {
writer.writeNamespace(prefix, namespace);
}
} catch(Exception ex) {
ex.printStackTrace();
}
}
private String fixNull(String s) {
return s == null ? "" : s;
}
/**
* Inherit the namespace attributes from e's parents and set it
* in e, if the prefix is not already resolved.
*/
private void resolvePrefix(
Element e,
Map<String,String> resolvedPrefixes) {
String nodePrefix = fixNull(e.getPrefix());
String nodeNamespace = e.getNamespaceURI();
if(nodeNamespace != null) {
/**
* Set the namespace attribute if it is not already set
*/
if(!resolvedPrefixes.containsKey(nodePrefix)) {
String attrName = (nodePrefix.trim().length() == 0)
? "xmlns" : "xmlns:" + nodePrefix;
e.setAttribute(attrName, nodeNamespace);
resolvedPrefixes.put(nodePrefix, nodeNamespace);
}
}
}
/**
* writes the node pointed by XMLStreamReader to the XMLStreamWriter
* Strictly speaking, this method should not be in this class.
*
* @param reader XMLStreamReader from where the contents should be read.
* @param writer XMLStreamWriter to where the contents should be written.
*/
// TODO : handle attributes.
public void writeNode(XMLStreamReader reader, XMLStreamWriter writer) throws Exception {
writeNode(reader, writer, new HashMap<String,String>());
}
public void writeChildren(XMLStreamReader reader, XMLStreamWriter writer) throws Exception {
writeChildren(reader, writer, new HashMap<String,String>());
}
public void writeNode(
XMLStreamReader reader,
XMLStreamWriter writer,
Map<String,String> ancestorNamespaceAttrs) throws Exception {
int depth = 0;
int event = reader.getEventType();
do {
switch(event) {
case XMLStreamReader.START_DOCUMENT:
reader.next();
writeNode(reader, writer);
break;
case XMLStreamReader.START_ELEMENT:
String tagName =
(reader.getPrefix() != null && reader.getPrefix().length() != 0)
? reader.getPrefix() + ":" + reader.getLocalName()
: reader.getLocalName();
writer.writeStartElement(tagName);
writeAttributes(reader, writer);
writeAncestorNamespaceAttrs(reader, writer, ancestorNamespaceAttrs);
++depth;
break;
case XMLStreamReader.CHARACTERS:
writer.writeCharacters(reader.getText());
break;
case XMLStreamReader.END_ELEMENT:
writer.writeEndElement();
--depth;
}
event = reader.next();
} while(depth > 0);
}
public void writeChildren(
XMLStreamReader reader,
XMLStreamWriter writer,
Map<String,String> ancestorNamespaceAttrs) throws Exception {
reader.next();
while(reader.getEventType() != XMLStreamReader.END_ELEMENT) {
writeNode(reader, writer, ancestorNamespaceAttrs);
}
reader.next();
}
/**
* Writes the node to the XMLStreamWriter as text.
*
* @param node Node from where the contents should be read.
* @param writer XMLStreamWriter to where the contents should be written.
*/
public void writeNode(Node node, XMLStreamWriter writer) throws Exception {
writeNode(node, writer, new HashMap<String,String>());
}
public void writeChildren(XMLStreamWriter writer, Node node) throws Exception {
NodeList l = node.getChildNodes();
int size = l.getLength();
for ( int i = 0; i < size; i++ ) {
writeNode(l.item(i), writer, new HashMap<String,String>());
}
}
/**
* namespaceMap keeps track of the namespace attributes set
* in the the ancestor node.
*/
public void writeNode(Node node, XMLStreamWriter writer, Map<String,String> resolvedPrefixes) throws Exception {
short type = node.getNodeType();
switch ( type ) {
case Node.DOCUMENT_NODE: {
writer.writeStartDocument();
writeChildren(writer, node, resolvedPrefixes);
break;
}
case Node.DOCUMENT_FRAGMENT_NODE: {
writeChildren(writer, node, resolvedPrefixes);
break;
}
case Node.ELEMENT_NODE: {
Element e = (Element)node;
String n = e.getTagName();
resolvePrefix(e, resolvedPrefixes);
writer.writeStartElement(n);
NamedNodeMap a = e.getAttributes();
int size = a.getLength();
for ( int i = 0; i < size; i++ ) {
Attr att = (Attr)a.item(i);
writeNode(att, writer, resolvedPrefixes);
}
if ( e.hasChildNodes() ) {
writeChildren(writer, node, resolvedPrefixes);
writer.writeEndElement();
} else
writer.writeEndElement();
break;
}
case Node.ATTRIBUTE_NODE:
Attr a = (Attr)node;
writer.writeAttribute(a.getName(), a.getValue());
break;
case Node.PROCESSING_INSTRUCTION_NODE: {
ProcessingInstruction pi = (ProcessingInstruction)node;
writer.writeProcessingInstruction(pi.getTarget(), pi.getData());
break;
}
case Node.TEXT_NODE: {
writer.writeCharacters(node.getNodeValue());
break;
}
case Node.CDATA_SECTION_NODE: {
writer.writeCData(node.getNodeValue());
break;
}
case Node.COMMENT_NODE: {
writer.writeComment(node.getNodeValue());
break;
}
}
}
/**
* This method should be used only from
* writeNode(node,writer,resolvedPrefixes) method.
*/
private void writeChildren(XMLStreamWriter writer,
Node node,
Map<String,String> resolvedPrefixes) throws Exception {
NodeList l = node.getChildNodes();
int size = l.getLength();
for ( int i = 0; i < size; i++ ) {
writeNode(l.item(i), writer, resolvedPrefixes);
}
}
/**
* gets the element.
*
* @param aParentDocument Document for parent node
* @param aTagName String for tagname
* @return Element with tagname
*/
public Element getElement(
Document aParentDocument,
String aTagName) {
NodeList nodeList = aParentDocument.getElementsByTagName(aTagName);
return (nodeList != null) ? (Element) nodeList.item(0) : null;
}
/**
* gets the element.
*
* @param elem Element for parent node
* @param tagName String for tagname
* @return Element with tagname
*/
public Element getElement(
Element elem,
String tagName
) {
NodeList nl = elem.getElementsByTagName(tagName);
Element childElem = (Element) nl.item(0);
return childElem;
}
/**
* gets the element value.
*
* @param doc Document for parent node
* @param elemName String for element name
* @return Element value
*/
public String getElementValue(
Document doc,
String elemName
) {
String elemVal = null;
Element elem = getElement(doc, elemName);
elemVal = getTextData(elem);
return elemVal;
}
/**
* use this util method to create/retrieve a Text Node in a element.
*
* @param aElement Element node
* @return Text node for text data
*/
private Text getText(Element aElement) {
Node node = null;
aElement.normalize();
node = aElement.getFirstChild();
if ((node == null) || !(node instanceof Text)) {
node = aElement.getOwnerDocument().createTextNode("");
aElement.appendChild(node);
}
return (Text) node;
}
/**
* use this util method to set a Text Data in a element.
*
* @param aElement Element for text node
* @param aData String contains text
*/
public void setTextData(
Element aElement,
String aData
) {
getText(aElement).setData(aData);
}
/**
* use this util method to retrieve a Text Data in a element.
*
* @param aElement Element for text node
* @return String contains text
*/
public String getTextData(Element aElement) {
return getText(aElement).getData();
}
/**
* save document to stream.
*
* @param aDocument Document
* @param aWriter is what the aDocument is serialized to.
* @return String representation of Document
* @throws Exception If fails to construct a string.
*/
public String DOM2String(Document aDocument,
Writer aWriter) throws Exception {
TransformerFactory transformerFactory =
TransformerFactory.newInstance();
Transformer transformer;
try {
transformer = transformerFactory.newTransformer();
} catch (javax.xml.transform.TransformerConfigurationException e) {
e.printStackTrace();
transformer = null;
throw e;
}
transformer.setOutputProperty(OutputKeys.METHOD, "xml");
transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "no");
transformer.setOutputProperty(OutputKeys.STANDALONE, "yes");
transformer.setOutputProperty(OutputKeys.CDATA_SECTION_ELEMENTS, "");
transformer.setOutputProperty(OutputKeys.INDENT, "no");
try {
transformer.transform(new DOMSource(aDocument),
new StreamResult(aWriter));
} catch (javax.xml.transform.TransformerException e) {
e.printStackTrace();
throw e;
}
return aWriter.toString();
}
/**
* gets list of elements.
*
* @param aParentElement Element for parent
* @param aTagName String for tagname
* @return NodeList with tagname
*/
public NodeList getElements(
Element aParentElement,
String aTagName
) {
return aParentElement.getElementsByTagNameNS(
aParentElement.getNamespaceURI(),
aTagName
);
}
/**
* gets set of elements.
*
* @param aParentDocument Document for parent node
* @param aTagName String for tagname
* @return NodeList with tagname
*/
public NodeList getElements(
Document aParentDocument,
String aTagName
) {
return aParentDocument.getElementsByTagNameNS("*", aTagName);
}
/**
* get the children of the same type element tag name.
*
* @param aElement Element for parent node
* @param aElementTagName String for tagname
* @return NodeList for list of children with the tagname
*/
public NodeList getChildElements(
Element aElement,
String aElementTagName
) {
NodeList nodeList = aElement.getChildNodes();
NodeListImpl list = new NodeListImpl();
int count = nodeList.getLength();
for (int i = 0; i < count; ++i) {
Node node = nodeList.item(i);
if (node instanceof Element) {
String tagName = getElementName((Element) node);
if (tagName.equals(aElementTagName)) {
list.add(node);
}
}
}
return list;
}
/**
* get Element Tag Name with striped prefix.
*
* @param aElement Element object
* @return String with stripped prefix
*/
public String getElementName(Element aElement) {
String tagName = aElement.getTagName();
return getName(tagName);
}
/**
* strips the prefix of the name if present.
*
* @param aName String value of Name with prefix
* @return String for name after striping prefix
*/
public String getName(String aName) {
int lastIdx = aName.lastIndexOf(':');
if (lastIdx >= 0) {
return aName.substring(lastIdx + 1);
}
return aName;
}
/**
* NodeListImpl.
*/
public static class NodeListImpl extends ArrayList implements NodeList {
/**
* Default Constructor.
*/
public NodeListImpl() {
super();
}
/**
* nodelist length.
*
* @return int for number of nodes in nodelist
*/
public int getLength() {
return this.size();
}
/**
* return a node.
*
* @param aIndex int for the index of the node
* @return Node at the index
*/
public Node item(int aIndex) {
return (Node) this.get(aIndex);
}
}
}
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