/*
* 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.wso2.carbon.mediator.calltemplate.util;
import org.apache.axiom.om.OMElement;
import org.apache.axiom.om.OMNamespace;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
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;
/**
* Represents a Value
* Handling both static and dynamic(Xpath) keys.
* User can give Xpath expression as a key and derive
* real key based on message context
*/
public class Value {
private static final Log log = LogFactory.getLog(org.apache.synapse.mediators.Value.class);
/**
* Name of the value attribute
*/
private String name = null;
/**
* The static key value
*/
private String keyValue = null;
/**
* the dynamic key
*/
private SynapseXPath expression = null;
private List<OMNamespace> namespaceList = new ArrayList<OMNamespace>();
/**
* Create a key instance using a static key
*
* @param staticKey static key
*/
public Value(String staticKey) {
this.keyValue = staticKey;
}
/**
* Create a key instance using a dynamic key (Xpath Expression)
*
* @param expression SynapseXpath for dynamic key
*/
public Value(SynapseXPath expression) {
this.expression = expression;
}
/**
* Retrieving static key
*
* @return static key
*/
public String getKeyValue() {
return keyValue;
}
/**
* Retrieving dynamic key
*
* @return SynapseXpath
*/
public SynapseXPath getExpression() {
if(expression == null && keyValue != null && hasExprTypeKey()){
try {
expression = new SynapseXPath(keyValue.substring(1, keyValue.length()-1));
for (OMNamespace aNamespaceList : namespaceList) {
expression.addNamespace(aNamespaceList);
}
} catch (JaxenException e) {
expression = null;
handleException("Can not evaluate escaped expression..");
}
}
return expression;
}
/**
* Handle exceptions
*
* @param msg error message
*/
private void handleException(String msg) {
log.error(msg);
throw new SynapseException(msg);
}
/**
* checks whether key returned by #getKeyValue() is a string of an expression type.
* @return if true if this is an expression
*/
public boolean hasExprTypeKey() {
return keyValue != null && keyValue.startsWith("{") && keyValue.endsWith("}");
}
public void setNamespaces(OMElement elem){
Iterator namespaces = elem.getAllDeclaredNamespaces();
while (namespaces.hasNext()){
OMNamespace ns = (OMNamespace) namespaces.next();
namespaceList.add(ns);
}
}
public void addNamespace(OMNamespace ns){
if (ns != null){
namespaceList.add(ns);
}
}
@Override
public String toString() {
return "Value {" +
"name ='" + name + '\'' +
(keyValue != null ? ", keyValue ='" + keyValue + '\'' : "") +
(expression != null ? ", expression =" + expression : "") +
'}';
}
}