1 /* 2 * ModeShape (http://www.modeshape.org) 3 * See the COPYRIGHT.txt file distributed with this work for information 4 * regarding copyright ownership. Some portions may be licensed 5 * to Red Hat, Inc. under one or more contributor license agreements. 6 * See the AUTHORS.txt file in the distribution for a full listing of 7 * individual contributors. 8 * 9 * ModeShape is free software. Unless otherwise indicated, all code in ModeShape 10 * is licensed to you under the terms of the GNU Lesser General Public License as 11 * published by the Free Software Foundation; either version 2.1 of 12 * the License, or (at your option) any later version. 13 * 14 * ModeShape 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 GNU 17 * Lesser General Public License for more details. 18 * 19 * You should have received a copy of the GNU Lesser General Public 20 * License along with this software; if not, write to the Free 21 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 22 * 02110-1301 USA, or see the FSF site: http://www.fsf.org. 23 */ 24 package org.modeshape.graph.query.model; 25 26 import net.jcip.annotations.Immutable; 27 import org.modeshape.common.util.CheckArg; 28 import org.modeshape.common.util.HashCode; 29 30 /** 31 * A constraint requiring that the selected node is a child of the node reachable by the supplied absolute path 32 */ 33 @Immutable 34 public class ChildNode implements Constraint { 35 private static final long serialVersionUID = 1L; 36 37 private final SelectorName selectorName; 38 private final String parentPath; 39 private final int hc; 40 41 /** 42 * Create a constraint requiring that the node identified by the selector is a child of the node reachable by the supplied 43 * absolute path. 44 * 45 * @param selectorName the name of the selector 46 * @param parentPath the absolute path to the parent 47 */ 48 public ChildNode( SelectorName selectorName, 49 String parentPath ) { 50 CheckArg.isNotNull(selectorName, "selectorName"); 51 CheckArg.isNotNull(parentPath, "parentPath"); 52 this.selectorName = selectorName; 53 this.parentPath = parentPath; 54 this.hc = HashCode.compute(this.selectorName, this.parentPath); 55 } 56 57 /** 58 * Get the name of the selector representing the child 59 * 60 * @return the selector name; never null 61 */ 62 public final SelectorName selectorName() { 63 return selectorName; 64 } 65 66 /** 67 * Get the path of the parent. 68 * 69 * @return the parent path; never null 70 */ 71 public final String parentPath() { 72 return parentPath; 73 } 74 75 /** 76 * {@inheritDoc} 77 * 78 * @see java.lang.Object#toString() 79 */ 80 @Override 81 public String toString() { 82 return Visitors.readable(this); 83 } 84 85 /** 86 * {@inheritDoc} 87 * 88 * @see java.lang.Object#hashCode() 89 */ 90 @Override 91 public int hashCode() { 92 return hc; 93 } 94 95 /** 96 * {@inheritDoc} 97 * 98 * @see java.lang.Object#equals(java.lang.Object) 99 */ 100 @Override 101 public boolean equals( Object obj ) { 102 if (obj == this) return true; 103 if (obj instanceof ChildNode) { 104 ChildNode that = (ChildNode)obj; 105 if (this.hc != that.hc) return false; 106 if (!this.selectorName.equals(that.selectorName)) return false; 107 if (!this.parentPath.equals(that.parentPath)) return false; 108 return true; 109 } 110 return false; 111 } 112 113 /** 114 * {@inheritDoc} 115 * 116 * @see org.modeshape.graph.query.model.Visitable#accept(org.modeshape.graph.query.model.Visitor) 117 */ 118 public void accept( Visitor visitor ) { 119 visitor.visit(this); 120 } 121 }