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Commons JXPath example source code file (ExpressionContext.java)
The Commons JXPath ExpressionContext.java source code/* * 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.commons.jxpath; import java.util.List; /** * If an extenstion function has an argument of type ExpressionContext, * it can gain access to the current node of an XPath expression context. * <p> * Example: * <blockquote>* public class MyExtenstionFunctions { * public static String objectType(ExpressionContext context){ * Object value = context.getContextNodePointer().getValue(); * if (value == null){ * return "null"; * } * return value.getClass().getName(); * } * } * </pre> * * You can then register this extension function using a {@link ClassFunctions * ClassFunctions} object and call it like this: * <blockquote>* "/descendent-or-self::node()[ns:objectType() = 'java.util.Date']" * </pre> * This expression will find all nodes of the graph that are dates. */ public interface ExpressionContext { /** * Get the JXPathContext in which this function is being evaluated. * * @return A list representing the current context nodes. */ JXPathContext getJXPathContext(); /** * Get the current context node. * * @return The current context node pointer. */ Pointer getContextNodePointer(); /** * Get the current context node list. Each element of the list is * a Pointer. * * @return A list representing the current context nodes. */ List getContextNodeList(); /** * Returns the current context position. * @return int */ int getPosition(); } |
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