/**
* Copyright (C) 2010 dennis zhuang (killme2008@gmail.com)
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
**/
package com.googlecode.aviator.runtime.function.string;
import java.util.Map;
import com.googlecode.aviator.runtime.function.FunctionUtils;
import com.googlecode.aviator.runtime.type.AviatorFunction;
import com.googlecode.aviator.runtime.type.AviatorObject;
import com.googlecode.aviator.runtime.type.AviatorString;
/**
* string.substring(s1,s2) function
*
* @author dennis
*
*/
public class StringSubStringFunction implements AviatorFunction {
public String getName() {
return "string.substring";
}
public AviatorObject call(Map<String, Object> env, AviatorObject... args) {
if (args.length != 2 && args.length != 3) {
throw new IllegalArgumentException("string.endsWith(string,beginIndex[,endIndex])");
}
String target = FunctionUtils.getStringValue(0, args, env);
Number beginIndex = FunctionUtils.getNumberValue(1, args, env);
switch (args.length) {
case 2:
return new AviatorString(target.substring(beginIndex.intValue()));
case 3:
Number endIndex = FunctionUtils.getNumberValue(2, args, env);
return new AviatorString(target.substring(beginIndex.intValue(), endIndex.intValue()));
}
return null;
}
}