/*
* 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.
*/
package org.apache.synapse.mediators.eip;
import org.apache.axiom.om.OMElement;
import org.apache.axiom.om.OMNode;
import org.apache.axiom.soap.SOAPEnvelope;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.synapse.MessageContext;
import org.apache.synapse.SynapseException;
import org.apache.synapse.util.xpath.SynapseXPath;
import org.jaxen.JaxenException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
/**
* Utility methods for the EIP mediators
*/
public class EIPUtils {
private static final Log log = LogFactory.getLog(EIPUtils.class);
/**
* Return the set of elements specified by the XPath over the given envelope
*
* @param envelope SOAPEnvelope from which the elements will be extracted
* @param expression SynapseXPath expression describing the elements to be extracted
* @return List OMElements in the envelope matching the expression
* @throws JaxenException if the XPath expression evaluation fails
*/
public static List getMatchingElements(SOAPEnvelope envelope, SynapseXPath expression)
throws JaxenException {
return getMatchingElements(envelope,null,expression);
}
/**
* Return the set of elements specified by the XPath over the given envelope
*
* @param envelope SOAPEnvelope from which the elements will be extracted
* @param expression SynapseXPath expression describing the elements to be extracted
* @return List OMElements in the envelope matching the expression
* @throws JaxenException if the XPath expression evaluation fails
*/
public static List getMatchingElements(SOAPEnvelope envelope,MessageContext synCtxt, SynapseXPath expression)
throws JaxenException {
Object o = expression.evaluate(envelope, synCtxt);
if (o instanceof OMNode) {
List list = new ArrayList();
list.add(o);
return list;
} else if (o instanceof List) {
return (List) o;
} else {
return new ArrayList();
}
}
/**
* Return the set of detached elements specified by the XPath over the given envelope
*
* @param envelope SOAPEnvelope from which the elements will be extracted
* @param expression SynapseXPath expression describing the elements to be extracted
* @return List detached OMElements in the envelope matching the expression
* @throws JaxenException if the XPath expression evaluation fails
*/
public static List<OMNode> getDetachedMatchingElements(SOAPEnvelope envelope, MessageContext synCtxt,
SynapseXPath expression)
throws JaxenException {
List<OMNode> elementList = new ArrayList<OMNode>();
Object o = expression.evaluate(envelope, synCtxt);
if (o instanceof OMNode) {
elementList.add(((OMNode) o).detach());
} else if (o instanceof List) {
for (Object elem : (List) o) {
if (elem instanceof OMNode) {
elementList.add(((OMNode) elem).detach());
}
}
}
return elementList;
}
/**
* Merge two SOAP envelopes using the given XPath expression that specifies the
* element that enriches the first envelope from the second
*
* @param envelope SOAPEnvelope to be enriched with the content
* @param enricher SOAPEnvelope from which the enriching element will be extracted
* @param expression SynapseXPath describing the enriching element
* @throws JaxenException on failing of processing the xpath
*/
public static void enrichEnvelope(SOAPEnvelope envelope, SOAPEnvelope enricher,
MessageContext synCtxt,
SynapseXPath expression) throws JaxenException {
OMElement enrichingElement;
List elementList = getMatchingElements(envelope, synCtxt, expression);
List list = getMatchingElements(enricher, synCtxt, expression);
if ((checkNotEmpty(elementList) && checkNotEmpty(list))
|| (!checkNotEmpty(elementList) && checkNotEmpty(list))) {
if (checkNotEmpty(elementList)) {
// attach at parent of the first result from the XPath, or to the SOAPBody
Object o = elementList.get(0);
if (o instanceof OMElement &&
((OMElement) o).getParent() != null &&
((OMElement) o).getParent() instanceof OMElement) {
enrichingElement = (OMElement) ((OMElement) o).getParent();
OMElement body = envelope.getBody();
if (!isBody(body, enrichingElement)) {
OMElement nonBodyElem = enrichingElement;
enrichingElement = envelope.getBody();
addChildren(elementList, enrichingElement);
while (!isBody(body, (OMElement) nonBodyElem.getParent())) {
nonBodyElem = (OMElement) nonBodyElem.getParent();
}
nonBodyElem.detach();
}
}
}
enrichingElement = envelope.getBody();
if (list != null) {
addChildren(list, enrichingElement);
}
} else {
throw new SynapseException("Could not find matching elements to aggregate.");
}
}
private static boolean isBody(OMElement body, OMElement enrichingElement) {
try {
return (body.getLocalName().equals(enrichingElement.getLocalName()) &&
body.getNamespace().getNamespaceURI().equals(enrichingElement.getNamespace().getNamespaceURI()));
} catch (NullPointerException e) {
return false;
}
}
private static boolean checkNotEmpty(List list) {
return list != null && !list.isEmpty();
}
private static void addChildren(List list, OMElement element) {
Iterator itr = list.iterator();
Object o;
while (itr.hasNext()) {
o = itr.next();
if (o != null && o instanceof OMElement) {
element.addChild((OMElement) o);
}
itr.remove();
}
}
/**
* Util functions related to EIP Templates
*/
public static String getTemplatePropertyMapping(String templateName, String parameter) {
return templateName + ":" + parameter;
}
public static void createSynapseEIPTemplateProperty(MessageContext synCtxt, String templateName,
String paramName, Object value) {
String targetSynapsePropName = getTemplatePropertyMapping(templateName,paramName);
synCtxt.setProperty(targetSynapsePropName,value);
}
/**
* Enclose children of the soap body with a specific element
*
* @param envelope SOAPEnvelope which is to be enclosed
* @param encloseElement enclosing element
* @return modified SOAPEnvelope
*/
public static SOAPEnvelope encloseWithElement (SOAPEnvelope envelope, OMElement encloseElement) {
Iterator itr = envelope.getBody().getChildElements();
Object o;
while (itr.hasNext()) {
o = itr.next();
if (o != null && o instanceof OMElement) {
encloseElement.addChild((OMElement) o);
}
}
envelope.getBody().addChild(encloseElement);
return envelope;
}
}