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Commons JXPath example source code file (

This example Commons JXPath source code file ( is included in the "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Commons JXPath tags/keywords

expressioncontext, expressioncontext, jxpathcontext, jxpathcontext, list, list, pointer, pointer, util

The Commons JXPath 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
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * 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();

Other Commons JXPath examples (source code examples)

Here is a short list of links related to this Commons JXPath source code file:

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