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/**
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
/* @version $Rev$ $Date$ */
package org.apache.tuscany.sca.cpp.tools.services;
import java.io.File;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.Map.Entry;
import org.apache.tuscany.sca.cpp.tools.common.Utils;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
/**
*
*
*
*
*/
public class GenericDomNodeHandler implements DomNodeHandler {
/**
* This method parses the DOM attributes into name value pairs in the
* parameter map each valued keyed by its XPath.
*
* @param node
* the DOM node being processed
* @param contextPath
* the XPath to the DOM node being processed
* @param parameters
* a scratchpad map of name value pairs
*/
public void transferAttrsToParameters(Node node, String contextPath,
Map parameters) {
if (node == null || contextPath == null || parameters == null)
return;
NamedNodeMap attrs = node.getAttributes();
if (attrs != null) {
for (int i = 0; i < attrs.getLength(); i++) {
Node attr = attrs.item(i);
parameters.put(contextPath + "/" + "@" + attr.getNodeName(),
attr.getNodeValue());
// Report the library name to the deployment tool if required.
if ("library".equals(attr.getNodeName())) {
//This is a path relative to the composite root.
//so we need to add it in.
File mod = (File) parameters.get("compositeOrFragmentFile");
if (null != mod) {
String separatorForRegex = File.separator.replaceAll(
"\\\\", "\\\\\\\\");
String end = attr.getNodeValue().replaceAll("[/\\\\]+",
separatorForRegex);
if (!end.startsWith(File.separator)) {
end = File.separator + end;
}
String fullPath = mod.getParentFile().getAbsolutePath()
+ end;
Utils.postEvent(Utils.DEPLOYMENT_ARTEFACT_ENCOUNTERED,
fullPath);
}
}
}
}
return;
}
/**
* This method will iterate through the DOM node's children and call the
* appropriate handler for each one.
*
* @param node
* the DOM node being processed
* @param contextPath
* the XPath to the DOM node being processed
* @param handlers
* a map of element name to handler objects
* @param parameters
* a scratchpad map of name value pairs
*/
public void handleChildElements(Node node, String contextPath,
Map handlers, Map parameters) {
if (node == null || contextPath == null)
return;
NodeList children = node.getChildNodes();
if (children != null) {
for (int i = 0; i < children.getLength(); i++) {
Node child = children.item(i);
mapNodeToHandlerAndHandle(child, contextPath + "/"
+ child.getNodeName(), handlers, parameters);
}
}
return;
}
/**
* This method will resolve any registered handler for a particular DOM
* element and call the handleNode method on it. If the handlers map has a
* mapping from "entity" to an instance of EntityHandler which implements
* the DomNodeHandler interface then any node that looks like <entity>
* <any_other/><stuff/></entity>
*
* Will be passed to the EntityHandler to process.
*
* @param node
* the DOM node being processed
* @param contextPath
* the XPath to the DOM node being processed
* @param handlers
* a map of element name to handler objects
* @param parameters
* a scratchpad map of name value pairs
*/
public static void mapNodeToHandlerAndHandle(Node node, String contextPath,
Map handlers, Map parameters) {
if (node != null && node.getNodeType() == DomNodeHandler.ELEMENT) {
String nodeName = node.getNodeName();
if (nodeName != null && nodeName.length() > 0) {
DomNodeHandler handler = (DomNodeHandler) handlers
.get(nodeName);
if (handler != null) {
handler.handleNode(node, contextPath, handlers, parameters);
}
}
}
}
/**
* This method will place the attributes in this node into the parameter map
* keyed by the XPath and recursively continue processing for any
* sub-elements of the node.
*
* @param node
* The DOM node being consumed
* @param contextXPath
* The XPath to this node
* @param handlers
* The map from element name to node handler
* @param parameters
* A map of parameters - this is often used by a handler to place
* a name-value pair, the name is often an Xpath representation
* of the location of the data in the DOM but handlers are free
* to use whatever they like - the contextXpath is generated as
* an Xpath prefix for those handlers that wish to use it.
*/
public void handleNode(Node node, String contextXPath, Map handlers,
Map parameters) {
clearParametersAtThisXPath(contextXPath, parameters);
transferAttrsToParameters(node, contextXPath, parameters);
handleChildElements(node, contextXPath, handlers, parameters);
}
/**
* @param contextXPath
* @param parameters
*/
private void clearParametersAtThisXPath(String contextXPath, Map parameters) {
// TODO: Slow but works, improve parameters mechanism overall
// to make this unecessary
if (contextXPath == null || parameters == null) {
return;
}
// We want to clear both /compositeFragment and /composite
// subtrees when we come across the root of either..
if (contextXPath.equals("/compositeFragment")) {
//clear both this and "composite"
contextXPath = "/composite";
}
Set parms = parameters.entrySet();
if (null != parms) {
Iterator iter = parms.iterator();
Map.Entry item = null;
String thisKey;
while (iter.hasNext()) {
item = (Entry) iter.next();
thisKey = (String) item.getKey();
if (thisKey.startsWith(contextXPath)) {
//System.out.println(" removing " + thisKey + " for " +
// item.getValue().toString() + " against " + contextXPath);
iter.remove();
}
}
}
}
}
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