DivideFilter.java

/**********************************************************************
Copyright (c) 2009 Asfun Net.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
 **********************************************************************/
package net.asfun.jangod.lib.filter;

import java.math.BigDecimal;
import java.math.BigInteger;

import net.asfun.jangod.interpret.InterpretException;
import net.asfun.jangod.interpret.JangodInterpreter;
import net.asfun.jangod.lib.Filter;

public class DivideFilter implements Filter {

    @Override
    public Object filter(Object object, JangodInterpreter interpreter,
	    String... arg) throws InterpretException {
	if (arg.length != 1) {
	    throw new InterpretException("filter multiply expects 1 arg >>> "
		    + arg.length);
	}
	Object toMul = interpreter.evaluateExpression(arg[0]);
	Number num;
	if (toMul instanceof String) {
	    num = new BigDecimal(toMul.toString());
	} else if (toMul instanceof Number) {
	    num = (Number) toMul;
	} else {
	    return object;
	}
	if (object instanceof Integer) {
	    return (Integer) object / num.intValue();
	}
	if (object instanceof Float) {
	    return (Float) object / num.floatValue();
	}
	if (object instanceof Long) {
	    return (Long) object / num.longValue();
	}
	if (object instanceof Short) {
	    return (Short) object / num.shortValue();
	}
	if (object instanceof Double) {
	    return (Double) object / num.doubleValue();
	}
	if (object instanceof BigDecimal) {
	    return ((BigDecimal) object).divide(BigDecimal.valueOf(num
		    .doubleValue()));
	}
	if (object instanceof BigInteger) {
	    return ((BigInteger) object).divide(BigInteger.valueOf(num
		    .longValue()));
	}
	if (object instanceof Byte) {
	    return (Byte) object / num.byteValue();
	}
	if (object instanceof String) {
	    try {
		return Double.valueOf(object.toString()) / num.doubleValue();
	    } catch (Exception e) {
		throw new InterpretException(object
			+ " can't be dealed with multiply filter");
	    }
	}
	return object;
    }

    @Override
    public String getName() {
	return "divide";
    }

}