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 java.util.Set; 27 import net.jcip.annotations.Immutable; 28 29 /** 30 * A dynamic operand that evaluates to the qualified name of a node given by a selector, used in a {@link Comparison} constraint. 31 */ 32 @Immutable 33 public class NodeName implements DynamicOperand { 34 private static final long serialVersionUID = 1L; 35 36 private final Set<SelectorName> selectorNames; 37 38 /** 39 * Create a dynamic operand that evaluates to the qualified name of the node identified by the selector. 40 * 41 * @param selectorName the name of the selector 42 */ 43 public NodeName( SelectorName selectorName ) { 44 this.selectorNames = SelectorName.nameSetFrom(selectorName); 45 } 46 47 /** 48 * Get the selector symbol upon which this operand applies. 49 * 50 * @return the one selector names used by this operand; never null 51 */ 52 public SelectorName selectorName() { 53 return selectorNames.iterator().next(); 54 } 55 56 /** 57 * {@inheritDoc} 58 * 59 * @see org.modeshape.graph.query.model.DynamicOperand#selectorNames() 60 */ 61 public Set<SelectorName> selectorNames() { 62 return selectorNames; 63 } 64 65 /** 66 * {@inheritDoc} 67 * 68 * @see java.lang.Object#toString() 69 */ 70 @Override 71 public String toString() { 72 return Visitors.readable(this); 73 } 74 75 /** 76 * {@inheritDoc} 77 * 78 * @see java.lang.Object#hashCode() 79 */ 80 @Override 81 public int hashCode() { 82 return selectorNames().hashCode(); 83 } 84 85 /** 86 * {@inheritDoc} 87 * 88 * @see java.lang.Object#equals(java.lang.Object) 89 */ 90 @Override 91 public boolean equals( Object obj ) { 92 if (obj == this) return true; 93 if (obj instanceof NodeName) { 94 NodeName that = (NodeName)obj; 95 return this.selectorNames().equals(that.selectorNames()); 96 } 97 return false; 98 } 99 100 /** 101 * {@inheritDoc} 102 * 103 * @see org.modeshape.graph.query.model.Visitable#accept(org.modeshape.graph.query.model.Visitor) 104 */ 105 public void accept( Visitor visitor ) { 106 visitor.visit(this); 107 } 108 }