/**
* 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.system;
import java.util.Map;
import com.googlecode.aviator.exception.ExpressionRuntimeException;
import com.googlecode.aviator.lexer.token.OperatorType;
import com.googlecode.aviator.runtime.type.AviatorFunction;
import com.googlecode.aviator.runtime.type.AviatorObject;
/**
* Binary function,includes +,-,*,/,%,!
*
* @author dennis
*
*/
public class BinaryFunction implements AviatorFunction {
private final OperatorType opType;
public BinaryFunction(OperatorType opType) {
super();
this.opType = opType;
}
public String getName() {
return opType.getToken();
}
public OperatorType getOpType() {
return opType;
}
public AviatorObject call(Map<String, Object> env, AviatorObject... args) {
if (args.length != this.opType.getOperandCount()) {
throw new IllegalArgumentException(getName() + " has only " + opType.getOperandCount() + " arguments");
}
AviatorObject left = args[0];
switch (opType) {
case ADD:
AviatorObject right = args[1];
return left.add(right, env);
case SUB:
right = args[1];
return left.sub(right, env);
case MULT:
right = args[1];
return left.mult(right, env);
case DIV:
right = args[1];
return left.div(right, env);
case MOD:
right = args[1];
return left.mod(right, env);
case NOT:
return left.not(env);
case NEG:
return left.neg(env);
default:
throw new ExpressionRuntimeException(getName() + " is not a binary operation");
}
}
}