| /* |
| * 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.util.xpath; |
| |
| import org.apache.synapse.MessageContext; |
| import org.apache.synapse.mediators.GetPropertyFunction; |
| import org.apache.synapse.util.xpath.ext.XpathExtensionUtil; |
| import org.jaxen.Function; |
| import org.jaxen.FunctionContext; |
| import org.jaxen.UnresolvableException; |
| |
| /** |
| * <p>XPath function context to be used when resolving XPath functions when using the |
| * <code>SynapseXPath</code> and this resolves one function except for the standard XPath functions |
| * and Jaxen extension functions.</p> |
| * |
| * <p>The function that has been resolved by this FunctionContext is; <tt>get-property(String)</tt> |
| * which is used to retrieve message context properties</p> |
| * |
| * @see org.jaxen.XPathFunctionContext |
| * @see org.apache.synapse.util.xpath.SynapseXPath |
| */ |
| public class SynapseXPathFunctionContext implements FunctionContext { |
| /** Parent function context */ |
| private final FunctionContext parent; |
| |
| /** MessageContext to be used by the function resolver */ |
| private final MessageContext synCtx; |
| |
| /** |
| * <p>Initialises the function context</p> |
| * |
| * @param parent the parent function context |
| * @param synCtx message to be used for the function initialization |
| * |
| * @see org.jaxen.XPathFunctionContext |
| */ |
| public SynapseXPathFunctionContext(FunctionContext parent, MessageContext synCtx) { |
| this.parent = parent; |
| this.synCtx = synCtx; |
| } |
| |
| /** |
| * Get the function with a given namespace and name. |
| * <p> |
| * Only the <tt>get-property</tt> function is recognized by this class. Any other |
| * function will be resolved using the parent function context. |
| * |
| * @param namespaceURI namespace of the function to be resolved |
| * @param prefix string prefix to be resolved |
| * @param localName string local name of the function |
| * @return resolved function |
| * @throws UnresolvableException if the function specified does not found |
| */ |
| public Function getFunction(String namespaceURI, String prefix, String localName) |
| throws UnresolvableException { |
| |
| if (localName != null && SynapseXPathConstants.GET_PROPERTY_FUNCTION.equals(localName)) { |
| |
| // create an instance of a synapse:get-property() |
| // function and set it to the xpath |
| return new GetPropertyFunction(synCtx); |
| |
| } else if (localName != null && |
| SynapseXPathConstants.BASE64_ENCODE_FUNCTION.equals(localName)) { |
| // create a base64Encode function and set it to the XPath |
| return new Base64EncodeFunction(); |
| } else if (localName != null && |
| SynapseXPathConstants.BASE64_DECODE_FUNCTION.equals(localName)) { |
| // create a base64Decode function and set it to the XPath |
| return new Base64DecodeFunction(); |
| } else if (localName != null && |
| SynapseXPathConstants.URL_ENCODE_FUNCTION.equals(localName)) { |
| // create a url-encode function and set it to the XPath |
| return new URLEncodeFunction(); |
| } |
| //We check if custom Xpath extensions are available |
| Function extensionFunction = XpathExtensionUtil.getFunctionContext( |
| synCtx,namespaceURI,prefix, localName); |
| if (extensionFunction != null) { |
| return extensionFunction; |
| } |
| // if not the get-property function then try to get it from the parent context |
| return parent.getFunction(namespaceURI, prefix, localName); |
| } |
| } |