1 /* 2 * XltC.java 3 * This file is part of JaCoP. 4 * <p> 5 * JaCoP is a Java Constraint Programming solver. 6 * <p> 7 * Copyright (C) 2000-2008 Krzysztof Kuchcinski and Radoslaw Szymanek 8 * <p> 9 * This program is free software: you can redistribute it and/or modify 10 * it under the terms of the GNU Affero General Public License as published by 11 * the Free Software Foundation, either version 3 of the License, or 12 * (at your option) any later version. 13 * <p> 14 * This program is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU Affero General Public License for more details. 18 * <p> 19 * Notwithstanding any other provision of this License, the copyright 20 * owners of this work supplement the terms of this License with terms 21 * prohibiting misrepresentation of the origin of this work and requiring 22 * that modified versions of this work be marked in reasonable ways as 23 * different from the original version. This supplement of the license 24 * terms is in accordance with Section 7 of GNU Affero General Public 25 * License version 3. 26 * <p> 27 * You should have received a copy of the GNU Affero General Public License 28 * along with this program. If not, see <http://www.gnu.org/licenses/>. 29 */ 30 31 package org.jacop.constraints; 32 33 import org.jacop.core.Domain; 34 import org.jacop.core.IntDomain; 35 import org.jacop.core.IntVar; 36 import org.jacop.core.Store; 37 38 import java.util.concurrent.atomic.AtomicInteger; 39 40 /** 41 * Constraint X {@literal <} C 42 * 43 * @author Krzysztof Kuchcinski and Radoslaw Szymanek 44 * @version 4.8 45 */ 46 47 public class XltC extends PrimitiveConstraint { 48 49 final static AtomicInteger idNumber = new AtomicInteger(0); 50 51 /** 52 * It specifies variable x to be lower than a given constant. 53 */ 54 final public IntVar x; 55 56 /** 57 * It specifies constant 58 */ 59 final public int c; 60 61 /** 62 * It constructs constraint X {@literal <} C. 63 * 64 * @param x variable x. 65 * @param c constant c. 66 */ XltC(IntVar x, int c)67 public XltC(IntVar x, int c) { 68 69 if (x == null) 70 throw new IllegalArgumentException("Constraint XltC has variable x that is null."); 71 72 numberId = idNumber.incrementAndGet(); 73 74 this.x = x; 75 this.c = c; 76 77 setScope(x); 78 } 79 consistency(final Store store)80 @Override public void consistency(final Store store) { 81 x.domain.inMax(store.level, x, c - 1); 82 } 83 getDefaultNestedConsistencyPruningEvent()84 @Override protected int getDefaultNestedConsistencyPruningEvent() { 85 return IntDomain.BOUND; 86 } 87 getDefaultNestedNotConsistencyPruningEvent()88 @Override protected int getDefaultNestedNotConsistencyPruningEvent() { 89 return IntDomain.BOUND; 90 } 91 getDefaultNotConsistencyPruningEvent()92 @Override protected int getDefaultNotConsistencyPruningEvent() { 93 return Domain.NONE; 94 } 95 getDefaultConsistencyPruningEvent()96 @Override public int getDefaultConsistencyPruningEvent() { 97 return Domain.NONE; 98 } 99 notConsistency(final Store store)100 @Override public void notConsistency(final Store store) { 101 x.domain.inMin(store.level, x, c); 102 } 103 notSatisfied()104 @Override public boolean notSatisfied() { 105 return x.min() >= c; 106 } 107 satisfied()108 @Override public boolean satisfied() { 109 return x.max() < c; 110 } 111 toString()112 @Override public String toString() { 113 return id() + " : XltC(" + x + ", " + c + " )"; 114 } 115 116 } 117