OoasTools

/**

  *

  *                      OOAS Compiler

  *

  *       Copyright 2015, AIT Austrian Institute of Technology.

  * This code is based on the C# Version of the OOAS Compiler, which is

  * copyright 2015 by the Institute of Software Technology, Graz University

  * of Technology with portions copyright by the AIT Austrian Institute of

  * Technology. All rights reserved.

  *

  * SEE THE "LICENSE" FILE FOR THE TERMS UNDER WHICH THIS FILE IS PROVIDED.

  *

  * If you modify the file please update the list of contributors below to in-

  * clude your name. Please also stick to the coding convention of using TABs

  * to do the basic (block-level) indentation and spaces for anything after

  * that. (Enable the display of special chars and it should be pretty obvious

  * what this means.) Also, remove all trailing whitespace.

  *

  * Contributors:

  *               Willibald Krenn (AIT)

  *               Stephan Zimmerer (AIT)

  *               Markus Demetz (AIT)

  *               Christoph Czurda (AIT)

  *

  */

package org.momut.ooas.math;

public final class SaturatedIntegerOperations extends Operations<Integer>{

	public static final class SatIntegerBasicOps extends BasicOps<Integer> {

		@Override

		public Integer unMinus(Integer input) {

			return input == Integer.MIN_VALUE ? Integer.MAX_VALUE : -input;

		}

		@Override

		public Integer minus(Integer inputA, Integer inputB) {

			if (inputB < 0)

				return (inputA > Integer.MAX_VALUE + inputB) ? Integer.MAX_VALUE : inputA - inputB;

			else

				return (inputA < Integer.MIN_VALUE + inputB) ? Integer.MIN_VALUE : inputA - inputB;

		}

		@Override

		public Integer plus(Integer inputA, Integer inputB) {

			if (inputB < 0)

				return (inputA < Integer.MIN_VALUE - inputB) ? Integer.MIN_VALUE : inputA + inputB;

			else

				return (inputA > Integer.MAX_VALUE - inputB) ? Integer.MAX_VALUE : inputA + inputB;

		}

		@Override

		public Integer div(Integer inputA, Integer inputB) {

			//FIXME: checked { return a / b; };

			return inputA / inputB;

		}

		@Override

		public Integer pow(Integer inputA, Integer inputB) {

			long tmp = (long) Math.pow(inputA, inputB);

			if (tmp < Integer.MIN_VALUE) return Integer.MIN_VALUE;

			else if (tmp > Integer.MAX_VALUE) return Integer.MAX_VALUE;

			else return (int)tmp;

		}

		@Override

		public Integer prod(Integer inputA, Integer inputB) {

			long tmp = (long)inputA * (long)inputB;

			if (tmp < Integer.MIN_VALUE) return Integer.MIN_VALUE;

			else if (tmp > Integer.MAX_VALUE) return Integer.MAX_VALUE;

			else return (int)tmp;

		}

		@Override

		public Integer mod(Integer inputA, Integer inputB) {return inputA % inputB;}

		@Override

		public boolean equal(Integer inputA, Integer inputB) {return inputA.equals(inputB);}

		@Override

		public boolean smaller(Integer inputA, Integer inputB) {return inputA < inputB;}

		@Override

		public boolean greater(Integer inputA, Integer inputB){return inputA > inputB;}

		@Override

		public Integer getDefaultValue() {return 0;}

	}

	public SaturatedIntegerOperations() {

		super(new SatIntegerBasicOps());

	}

}