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package com.sun.enterprise.deployment.node;
import java.util.Map;
import java.util.Iterator;
import org.w3c.dom.Node;
import org.w3c.dom.Element;
import org.xml.sax.Attributes;
import com.sun.enterprise.deployment.Descriptor;
import com.sun.enterprise.deployment.ExtensionElementDescriptor;
import com.sun.enterprise.deployment.DynamicAttributesDescriptor;
import com.sun.enterprise.deployment.xml.TagNames;
/**
* This node is responsible for loading and saving any type of
* xml node and store them in a DeploymentExtensionElement
*
* @author Jerome Dochez
*/
public class ExtensionElementNode extends DeploymentDescriptorNode {
ExtensionElementDescriptor descriptor;
/** Creates a new instance of DynamicDescriptorNode */
public ExtensionElementNode() {
descriptor = new ExtensionElementDescriptor();
}
/**
* all sub-implementation of this class can use a dispatch table to map xml element to
* method name on the descriptor class for setting the element value.
*
* @return the map with the element name as a key, the setter method as a value
*/
protected Map getDispatchTable() {
return null;
}
/**
* Adds a new DOL descriptor instance to the descriptor associated with this
* XMLNode
*
* @param XMLNode the sub-node adding the descriptor;
* @param descriptor the new descriptor
*/
protected void addNodeDescriptor(DeploymentDescriptorNode node) {
// nodes are added upon creation
ExtensionElementDescriptor dad = (ExtensionElementDescriptor) node.getDescriptor();
Iterator itr = dad.getElementNames();
// jump over first element;
if (itr.hasNext()) itr.next();
if (itr.hasNext() && !dad.hasAttributes()) {
descriptor.addElement(node.getXMLRootTag().getCompleteName(), dad);
} else {
descriptor.addElement(node.getXMLRootTag().getCompleteName(), dad.getElement(node.getXMLRootTag().getCompleteName()));
}
}
/**
* @return the descriptor instance to associate with this XMLNode
*/
public Object getDescriptor() {
return descriptor;
}
/**
* @return true if the element tag can be handled by any registered sub nodes of the
* current XMLNode
*/
public boolean handlesElement(XMLElement element) {
// we are never handling xml fragment only leaf nodes, we create subnodes for that.
return false;
}
/**
* @return the handler registered for the subtag element of the curent XMLNode
*/
public XMLNode getHandlerFor(XMLElement element) {
ExtensionElementNode subNode = new ExtensionElementNode();
subNode.setParentNode(this);
subNode.setXMLRootTag(new XMLElement(element.getCompleteName()));
return subNode;
}
/**
* SAX Parser API implementation, we don't really care for now.
*/
public void startElement(XMLElement element, Attributes attributes) {
if (attributes.getLength()>0) {
for (int i=0;i<attributes.getLength();i++) {
if (attributes.getLocalName(i).equals("type")) {
// type declaration... replace the standard xml declaration with ours...
descriptor.getAttributes().addExtraAttribute("xsi:type", attributes.getValue(i));
} else {
descriptor.getAttributes().addExtraAttribute(attributes.getQName(i), attributes.getValue(i));
}
}
}
}
/**
* receives notification of the value for a particular tag
*
* @param element the xml element
* @param value it's associated value
*/
public void setElementValue(XMLElement element, String value) {
descriptor.addElement(element.getCompleteName(), value);
}
/**
* receives notification of the end of an XML element by the Parser
*
* @param element the xml tag identification
* @return true if this node is done processing the XML sub tree
*/
public boolean endElement(XMLElement element) {
boolean allDone = element.getCompleteName().equals(getXMLRootTag().getCompleteName()) || element.getQName().equals(TagNames.EXTENSION_ELEMENT);
if (allDone) {
postParsing();
((DeploymentDescriptorNode) getParentNode()).addNodeDescriptor(this);
}
return allDone;
}
/**
* write the deployment extensions nodes associated with this node
*
* @param parent node for the DOM tree
* @param deployment extension element
*/
protected void writeDescriptor(Node parentNode, String tagName, ExtensionElementDescriptor descriptor) {
Element node = appendChildNS(parentNode, tagName, descriptor);
if (descriptor.hasAttributes()) {
Map attributes = descriptor.getAttributes().getExtraAttributes();
for (Iterator itr = attributes.keySet().iterator();itr.hasNext();) {
String key = (String) itr.next();
String value = (String) attributes.get(key);
String namespace = "";
if (key.indexOf(':')!=-1) {
String prefix = key.substring(0, key.indexOf(':'));
namespace = getNamespaceFor(descriptor, parentNode, prefix);
}
node.setAttributeNS(namespace, key, value);
}
}
addNamespaceDeclaration(node, descriptor);
for (Iterator itr = descriptor.getElementNames();itr.hasNext();) {
String elementName = (String) itr.next();
Object value = descriptor.getElement(elementName);
if (value instanceof ExtensionElementDescriptor) {
writeDescriptor(node, elementName, (ExtensionElementDescriptor) value);
} else
if (value instanceof String) {
appendTextChildNS(node, elementName, (String) value, descriptor);
}
}
}
/**
* <p>
* Append a new element child to the current node
* </p>
* @param parentNode is the parent node for the new child element
* @param elementName is new element tag name
* @return the newly created child node
*/
public Element appendChildNS(Node parent, String elementName, Descriptor descriptor) {
if (elementName.indexOf(':')!=-1) {
String prefix = elementName.substring(0, elementName.indexOf(':'));
elementName = elementName.substring(elementName.indexOf(':')+1);
String namespace = getNamespaceFor(descriptor, parent, prefix);
Element child = getOwnerDocument(parent).createElementNS(namespace, elementName);
child.setPrefix(prefix);
parent.appendChild(child);
return child;
}
return super.appendChild(parent, elementName);
}
/**
* look in the mapping defined in this descriptor and in all parent nodes
* for the right namespace for the passed prefix
*/
private String getNamespaceFor(Descriptor descriptor, Node parent, String prefix) {
Map prefixMapping = descriptor.getPrefixMapping();
String namespace = null;
if (prefixMapping!=null) {
namespace = (String) prefixMapping.get(prefix);
}
if (namespace==null) {
Element currentNode = (Element) parent;
namespace="";
while (currentNode!=null && namespace.length()==0) {
namespace = currentNode.getAttributeNS("http://www.w3.org/2000/xmlns/", prefix);
if (namespace.length()==0)
currentNode = (Element) currentNode.getParentNode();
}
}
return namespace;
}
/**
* <p>
* Append a new text child
* </p>
* @param parent for the new child element
* @param elementName is the new element tag name
* @param text the text for the new element
* @result the newly create child node
*/
public Node appendTextChildNS(Node parent, String elementName, String text, Descriptor descriptor) {
if (text == null || text.length()==0)
return null;
Node child = appendChildNS(parent, elementName, descriptor);
child.appendChild(getOwnerDocument(child).createTextNode(text));
return child;
}
}
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