org.jaxen.function.SubstringAfterFunction Maven / Gradle / Ivy
/*
* $Header$
* $Revision$
* $Date$
*
* ====================================================================
*
* 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
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* 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,
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* 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 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
*/
@SuppressWarnings({"rawtypes"})
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
*
* @ if args does not have length two
*/
public Object call(Context context,
List args)
{
if (args.size() == 2)
{
return evaluate( args.get(0),
args.get(1),
context.getNavigator() );
}
throw new RuntimeException( "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());
}
}