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A lib to access XML via XPath
There is a newer version: 1.0.5
/*
 * $Header: /cvs/jaxen/jaxen/src/java/main/org/jaxen/function/SubstringAfterFunction.java,v 1.11 2006/02/05 21:47:41 elharo Exp $
 * $Revision: 1.11 $
 * $Date: 2006/02/05 21:47:41 $
 *
 * ====================================================================
 *
 * Copyright 2000-2002 bob mcwhirter & James Strachan.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 * 
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 
 *   * Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 * 
 *   * Neither the name of the Jaxen Project nor the names of its
 *     contributors may be used to endorse or promote products derived 
 *     from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * ====================================================================
 * This software consists of voluntary contributions made by many 
 * individuals on behalf of the Jaxen Project and was originally 
 * created by bob mcwhirter  and 
 * James Strachan .  For more information on the 
 * Jaxen Project, please see .
 * 
 * $Id: SubstringAfterFunction.java,v 1.11 2006/02/05 21:47:41 elharo Exp $
 */


package org.navimatrix.jaxen.function;

import java.util.List;

import org.navimatrix.jaxen.Context;
import org.navimatrix.jaxen.Function;
import org.navimatrix.jaxen.FunctionCallException;
import org.navimatrix.jaxen.Navigator;

/**
 * 4.2 string substring-after(string,string) 
 * 
 * 
 * 
 * The substring-after function returns the substring of the first argument string 
 * that follows the first occurrence of the second argument string in the first 
 * argument string, or the empty string if the first argument string does not contain the second argument string. 
 * For example, substring-after("1999/04/01","/") returns 04/01, 
 * and substring-after("1999/04/01","19") returns 99/04/01.
 * 
 * 
 * @author bob mcwhirter (bob @ werken.com)
 * @see Section 4.2 of the XPath Specification
 */
public class SubstringAfterFunction implements Function
{

    /**
     * Create a new SubstringAfterFunction object.
     */
    public SubstringAfterFunction() {}


    /** 
     * Returns the part of the string-value of the first item in args
     * that follows the string-value of the second item in args;
     * or the empty string if the second string is not a substring of the first string.
     *
     * @param context the context at the point in the
     *         expression when the function is called
     * @param args a list that contains two items
     * 
     * @return a String containing that 
     *     part of the string-value of the first item in args
     *     that comes before the string-value of the second item in args
     * 
     * @throws FunctionCallException if args does not have length two
     */
    public Object call(Context context,
                       List args) throws FunctionCallException
    {
        if (args.size() == 2)
        {
            return evaluate( args.get(0),
                             args.get(1),
                             context.getNavigator() );
        }

        throw new FunctionCallException( "substring-after() requires two arguments." );
    }


    /** 
     * Returns the part of strArg that follows the first occurence 
     * of matchArg; or the empty string if the 
     * strArg does not contain matchArg
     * 
     * @param strArg the string from which the substring is extracted
     * @param matchArg the string that marks the boundary of the substring
     * @param nav the Navigator used to calculate the string-values of
     *     the first two arguments
     * 
     * @return a String containing
     *     the part of strArg that precedes the first occurence 
     *     of matchArg
     * 
     */
    public static String evaluate(Object strArg,
                                  Object matchArg,
                                  Navigator nav)
    {
        String str   = StringFunction.evaluate( strArg,
                                                nav );

        String match = StringFunction.evaluate( matchArg,
                                                nav );
    
        int loc = str.indexOf(match);

        if ( loc < 0 )
        {
            return "";
        }

        return str.substring(loc+match.length());
    }
}