/*
* $Header: /home/projects/jaxen/scm/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 <bob@werken.com> and
* James Strachan <jstrachan@apache.org>. For more information on the
* Jaxen Project, please see <http://www.jaxen.org/>.
*
* $Id: SubstringAfterFunction.java,v 1.11 2006/02/05 21:47:41 elharo Exp $
*/
package org.orbeon.jaxen.function;
import org.orbeon.jaxen.Context;
import org.orbeon.jaxen.Function;
import org.orbeon.jaxen.FunctionCallException;
import org.orbeon.jaxen.Navigator;
import java.util.List;
/**
* <p><b>4.2</b> <code><i>string</i> substring-after(<i>string</i>,<i>string</i>)</code></p>
*
*
* <blockquote src="http://www.w3.org/TR/xpath">
* The <b>substring-after</b> 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.
* </blockquote>
*
* @author bob mcwhirter (bob @ werken.com)
* @see <a href="http://www.w3.org/TR/xpath#function-substring-after" target="_top">Section 4.2 of the XPath Specification</a>
*/
public class SubstringAfterFunction implements Function
{
/**
* Create a new <code>SubstringAfterFunction</code> object.
*/
public SubstringAfterFunction() {}
/**
* Returns the part of the string-value of the first item in <code>args</code>
* that follows the string-value of the second item in <code>args</code>;
* 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 <code>String</code> containing that
* part of the string-value of the first item in <code>args</code>
* that comes before the string-value of the second item in <code>args</code>
*
* @throws FunctionCallException if <code>args</code> 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 <code>strArg</code> that follows the first occurence
* of <code>matchArg</code>; or the empty string if the
* <code>strArg</code> does not contain <code>matchArg</code>
*
* @param strArg the string from which the substring is extracted
* @param matchArg the string that marks the boundary of the substring
* @param nav the <code>Navigator</code> used to calculate the string-values of
* the first two arguments
*
* @return a <code>String</code> containing
* the part of <code>strArg</code> that precedes the first occurence
* of <code>matchArg</code>
*
*/
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());
}
}