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'rapiddweller Script' is an open source software library for resolving Java-like script expressions, forked from Databene Scripts written by Volker Bergmann.

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/*
 * Copyright (C) 2011-2014 Volker Bergmann ([email protected]).
 * All rights reserved.
 *
 * 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 com.rapiddweller.script.math;

import java.sql.Time;
import java.util.Date;

import com.rapiddweller.commons.BeanUtil;
import com.rapiddweller.commons.TimeUtil;

/**
 * {@link TypeArithmetic} implementation for Time objects.

 * 

 * Created at 06.10.2009 10:31:14
 * @since 0.6.0
 * @author Volker Bergmann
 */

public class TimeArithmetic extends TypeArithmetic {

    public TimeArithmetic() {
	    super(Time.class);
    }

    // Arithmetic interface implementation -----------------------------------------------------------------------------

    @Override
    public Time add(Object summand1, Object summand2) {
    	if (summand1 instanceof Time)
    		return addImpl((Time) summand1, summand2);
    	else if (summand2 instanceof Number)
    		return addImpl((Time) summand2, summand1);
    	else
    		throw new IllegalArgumentException("No argument is of type " + baseType + ": " + 
    				summand1 + ", " + summand2);
    }

    @Override
    public Object subtract(Object minuend, Object subtrahend) {
    	if (minuend instanceof Date) {
            long minuendMillis = ((Date) minuend).getTime();
    		if (subtrahend instanceof Date)
	            return new Time(minuendMillis - TimeUtil.millisSinceOwnEpoch((Date) subtrahend));
            else if (subtrahend instanceof Number)
	    		return new Time(minuendMillis - ((Number) subtrahend).longValue());
            else
        		throw new IllegalArgumentException("Subtrahend must be Date, Time, Timestamp or Number, but was: " + 
        				subtrahend.getClass().getName());
    	} else
    		throw new IllegalArgumentException("Minuend needs to be of type " + baseType + ", but was: " + 
    				minuend.getClass().getName());
    }

    @Override
    public Object multiply(Object factor1, Object factor2) {
	    throw new UnsupportedOperationException("Cannot multiply times");
    }

    @Override
    public Object divide(Object quotient, Object divisor) {
	    throw new UnsupportedOperationException("Cannot divide times");
    }

    // private methods -------------------------------------------------------------------------------------------------
    
	private static Time addImpl(Time summand1, Object summand2) {
    	if (summand2 instanceof Number)
    		return new Time(summand1.getTime() + ((Number) summand2).longValue());
    	else if (summand2 instanceof Date)
    		return new Time(summand1.getTime() + TimeUtil.millisSinceOwnEpoch((Date) summand2));
    	else
    		throw new IllegalArgumentException("Cannot add " +
    				BeanUtil.simpleClassName(summand2) + " to java.util.Date");
    }

}