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/*
 * Copyright (c) 2013, SRI International
 * All rights reserved.
 * Licensed under the The BSD 3-Clause License;
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 * 
 * http://opensource.org/licenses/BSD-3-Clause
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * 
 * Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * 
 * Neither the name of the aic-expresso nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
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package com.sri.ai.grinder.sgdpllt.library.inequality;

import static com.sri.ai.grinder.sgdpllt.library.FunctorConstants.GREATER_THAN;
import static com.sri.ai.grinder.sgdpllt.library.FunctorConstants.GREATER_THAN_OR_EQUAL_TO;
import static com.sri.ai.grinder.sgdpllt.library.FunctorConstants.LESS_THAN;
import static com.sri.ai.grinder.sgdpllt.library.FunctorConstants.LESS_THAN_OR_EQUAL_TO;
import static com.sri.ai.util.Util.map;

import java.util.Map;

import com.google.common.annotations.Beta;
import com.sri.ai.grinder.sgdpllt.library.number.GreaterThan;
import com.sri.ai.grinder.sgdpllt.library.number.GreaterThanOrEqualTo;
import com.sri.ai.grinder.sgdpllt.library.number.LessThan;
import com.sri.ai.grinder.sgdpllt.library.number.LessThanOrEqualTo;
import com.sri.ai.grinder.sgdpllt.rewriter.api.Rewriter;
import com.sri.ai.grinder.sgdpllt.rewriter.api.Simplifier;
import com.sri.ai.grinder.sgdpllt.rewriter.core.Switch;

/**
 * A {@link Simplifier} with inequality functions (> <, >=, <=)
 * 
 * @author braz
 *
 */
@Beta
public class InequalitySimplifier extends Switch {
	
	public InequalitySimplifier() {
		super(Switch.FUNCTOR, makeFunctionApplicationSimplifiers());
	}
	
	public static Map makeFunctionApplicationSimplifiers() {
		return map(
				LESS_THAN_OR_EQUAL_TO,    (Simplifier) (f, context) ->
				LessThanOrEqualTo.simplify(f, context),

				LESS_THAN,                (Simplifier) (f, context) ->
				LessThan.simplify(f, context),
				
				GREATER_THAN_OR_EQUAL_TO, (Simplifier) (f, context) ->
				GreaterThanOrEqualTo.simplify(f, context),

				GREATER_THAN,             (Simplifier) (f, context) ->
				GreaterThan.simplify(f, context)
				);
	}
}