001 /* 002 * JBoss DNA (http://www.jboss.org/dna) 003 * See the COPYRIGHT.txt file distributed with this work for information 004 * regarding copyright ownership. Some portions may be licensed 005 * to Red Hat, Inc. under one or more contributor license agreements. 006 * See the AUTHORS.txt file in the distribution for a full listing of 007 * individual contributors. 008 * 009 * Unless otherwise indicated, all code in JBoss DNA is licensed 010 * to you under the terms of the GNU Lesser General Public License as 011 * published by the Free Software Foundation; either version 2.1 of 012 * the License, or (at your option) any later version. 013 * 014 * JBoss DNA is distributed in the hope that it will be useful, 015 * but WITHOUT ANY WARRANTY; without even the implied warranty of 016 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 017 * Lesser General Public License for more details. 018 * 019 * You should have received a copy of the GNU Lesser General Public 020 * License along with this software; if not, write to the Free 021 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 022 * 02110-1301 USA, or see the FSF site: http://www.fsf.org. 023 */ 024 package org.jboss.dna.jcr; 025 026 import java.util.UUID; 027 import net.jcip.annotations.Immutable; 028 import org.jboss.dna.common.util.HashCode; 029 import org.jboss.dna.graph.property.Name; 030 031 /** 032 * An immutable identifier for a property, often used to reference information a property held within the {@link SessionCache}. 033 */ 034 @Immutable 035 public final class PropertyId { 036 037 private final UUID nodeId; 038 private final Name propertyName; 039 private final int hc; 040 041 /** 042 * Create a new property identifier. 043 * 044 * @param nodeId the UUID of the node that owns the property being reference; may not be null 045 * @param propertyName the name of the property being referenced; may not be null 046 */ 047 public PropertyId( UUID nodeId, 048 Name propertyName ) { 049 assert nodeId != null; 050 assert propertyName != null; 051 this.nodeId = nodeId; 052 this.propertyName = propertyName; 053 this.hc = HashCode.compute(this.nodeId, this.propertyName); 054 } 055 056 /** 057 * Get the UUID of the node that owns the property. 058 * 059 * @return the node's UUID; never null 060 */ 061 public UUID getNodeId() { 062 return nodeId; 063 } 064 065 /** 066 * Get the name of the property. 067 * 068 * @return the property name; never null 069 */ 070 public Name getPropertyName() { 071 return propertyName; 072 } 073 074 /** 075 * {@inheritDoc} 076 * 077 * @see java.lang.Object#hashCode() 078 */ 079 @Override 080 public int hashCode() { 081 return hc; 082 } 083 084 /** 085 * {@inheritDoc} 086 * 087 * @see java.lang.Object#equals(java.lang.Object) 088 */ 089 @Override 090 public boolean equals( Object obj ) { 091 if (obj == this) return true; 092 if (obj instanceof PropertyId) { 093 PropertyId that = (PropertyId)obj; 094 if (this.hc != that.hc) return false; 095 if (!this.nodeId.equals(that.nodeId)) return false; 096 return this.propertyName.equals(that.propertyName); 097 } 098 return false; 099 } 100 101 /** 102 * {@inheritDoc} 103 * 104 * @see java.lang.Object#toString() 105 */ 106 @Override 107 public String toString() { 108 return this.nodeId.toString() + '@' + this.propertyName.toString(); 109 } 110 111 }