// Path: src/main/java/org/chocosolver/graphsolver/variables/delta/GraphDelta.java
// public class GraphDelta extends TimeStampedObject implements IDelta {
// 
// 	//NR NE AR AE : NodeRemoved NodeEnforced ArcRemoved ArcEnforced
// 	public final static int NR = 0;
// 	public final static int NE = 1;
// 	public final static int AR_TAIL = 2;
// 	public final static int AR_HEAD = 3;
// 	public final static int AE_TAIL = 4;
// 	public final static int AE_HEAD = 5;
// 	public final static int NB = 6;
// 
// 	//***********************************************************************************
// 	// VARIABLES
// 	//***********************************************************************************
// 
// 	private IEnumDelta[] deltaOfType;
// 
// 	//***********************************************************************************
// 	// CONSTRUCTORS
// 	//***********************************************************************************
// 
// 	public GraphDelta(IEnvironment environment) {
// 		super(environment);
// 		deltaOfType = new IEnumDelta[NB];
// 		for (int i = 0; i < NB; i++) {
// 			deltaOfType[i] = new EnumDelta(environment);
// 		}
// 	}
// 
// 	//***********************************************************************************
// 	// METHODS
// 	//***********************************************************************************
// 
// 	public int getSize(int i) {
// 		return deltaOfType[i].size();
// 	}
// 
// 	public void add(int element, int type, ICause cause) {
// 		lazyClear();
// 		deltaOfType[type].add(element, cause);
// 	}
// 
// 	public void lazyClear() {
// 		if (needReset()) {
// 			for (int i = 0; i < NB; i++) {
// 				deltaOfType[i].lazyClear();
// 			}
// 			resetStamp();
// 		}
// 	}
// 
// 	public int get(int index, int type) {
// 		return deltaOfType[type].get(index);
// 	}
// 
// 	public ICause getCause(int index, int type) {
// 		return deltaOfType[type].getCause(index);
// 	}
// }


import org.chocosolver.solver.exception.ContradictionException;
import org.chocosolver.util.objects.graphs.UndirectedGraph;
import org.chocosolver.util.objects.setDataStructures.ISet;
import org.chocosolver.graphsolver.variables.delta.GraphDelta;
import org.chocosolver.solver.ICause;
import org.chocosolver.solver.Model;
/*
 * Copyright (c) 1999-2014, Ecole des Mines de Nantes
 * All rights reserved.
 * 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 Ecole des Mines de Nantes 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 REGENTS 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 REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.chocosolver.graphsolver.variables;


public class UndirectedGraphVar extends GraphVar<UndirectedGraph> {

	//////////////////////////////// GRAPH PART /////////////////////////////////////////

	//***********************************************************************************
	// CONSTRUCTORS
	//***********************************************************************************

	/**
	 * Creates a graph variable
	 *
	 * @param name
	 * @param solver
	 * @param LB
	 * @param UB
	 */
	public UndirectedGraphVar(String name, Model solver, UndirectedGraph LB, UndirectedGraph UB) {
		super(name, solver, LB, UB);
	}

	//***********************************************************************************
	// METHODS
	//***********************************************************************************

	@Override
	public boolean removeArc(int x, int y, ICause cause) throws ContradictionException {
		assert cause != null;
		if (LB.edgeExists(x, y)) {
			this.contradiction(cause, "remove mandatory arc");
			return false;
		}
		if (UB.removeEdge(x, y)) {
			if (reactOnModification) {
// Path: src/main/java/org/chocosolver/graphsolver/variables/delta/GraphDelta.java
// public class GraphDelta extends TimeStampedObject implements IDelta {
// 
// 	//NR NE AR AE : NodeRemoved NodeEnforced ArcRemoved ArcEnforced
// 	public final static int NR = 0;
// 	public final static int NE = 1;
// 	public final static int AR_TAIL = 2;
// 	public final static int AR_HEAD = 3;
// 	public final static int AE_TAIL = 4;
// 	public final static int AE_HEAD = 5;
// 	public final static int NB = 6;
// 
// 	//***********************************************************************************
// 	// VARIABLES
// 	//***********************************************************************************
// 
// 	private IEnumDelta[] deltaOfType;
// 
// 	//***********************************************************************************
// 	// CONSTRUCTORS
// 	//***********************************************************************************
// 
// 	public GraphDelta(IEnvironment environment) {
// 		super(environment);
// 		deltaOfType = new IEnumDelta[NB];
// 		for (int i = 0; i < NB; i++) {
// 			deltaOfType[i] = new EnumDelta(environment);
// 		}
// 	}
// 
// 	//***********************************************************************************
// 	// METHODS
// 	//***********************************************************************************
// 
// 	public int getSize(int i) {
// 		return deltaOfType[i].size();
// 	}
// 
// 	public void add(int element, int type, ICause cause) {
// 		lazyClear();
// 		deltaOfType[type].add(element, cause);
// 	}
// 
// 	public void lazyClear() {
// 		if (needReset()) {
// 			for (int i = 0; i < NB; i++) {
// 				deltaOfType[i].lazyClear();
// 			}
// 			resetStamp();
// 		}
// 	}
// 
// 	public int get(int index, int type) {
// 		return deltaOfType[type].get(index);
// 	}
// 
// 	public ICause getCause(int index, int type) {
// 		return deltaOfType[type].getCause(index);
// 	}
// }


// Path: src/main/java/org/chocosolver/graphsolver/variables/UndirectedGraphVar.java
import org.chocosolver.solver.exception.ContradictionException;
import org.chocosolver.util.objects.graphs.UndirectedGraph;
import org.chocosolver.util.objects.setDataStructures.ISet;
import org.chocosolver.graphsolver.variables.delta.GraphDelta;
import org.chocosolver.solver.ICause;
import org.chocosolver.solver.Model;

/*
 * Copyright (c) 1999-2014, Ecole des Mines de Nantes
 * All rights reserved.
 * 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 Ecole des Mines de Nantes 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 REGENTS 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 REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.chocosolver.graphsolver.variables;


public class UndirectedGraphVar extends GraphVar<UndirectedGraph> {

	//////////////////////////////// GRAPH PART /////////////////////////////////////////

	//***********************************************************************************
	// CONSTRUCTORS
	//***********************************************************************************

	/**
	 * Creates a graph variable
	 *
	 * @param name
	 * @param solver
	 * @param LB
	 * @param UB
	 */
	public UndirectedGraphVar(String name, Model solver, UndirectedGraph LB, UndirectedGraph UB) {
		super(name, solver, LB, UB);
	}

	//***********************************************************************************
	// METHODS
	//***********************************************************************************

	@Override
	public boolean removeArc(int x, int y, ICause cause) throws ContradictionException {
		assert cause != null;
		if (LB.edgeExists(x, y)) {
			this.contradiction(cause, "remove mandatory arc");
			return false;
		}
		if (UB.removeEdge(x, y)) {
			if (reactOnModification) {
				delta.add(x, GraphDelta.AR_TAIL, cause);