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 * JBoss DNA is free software. Unless otherwise indicated, all code in JBoss DNA 010 * is licensed 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.connector.store.jpa.model.basic; 025 026 import java.io.Serializable; 027 import javax.persistence.Column; 028 import javax.persistence.Embeddable; 029 import net.jcip.annotations.Immutable; 030 031 /** 032 * A unique identifer for a large value, which is the 160-bit SHA-1 hash of this value, in hex form (40-bytes). The SHA-1 033 * algorithm is fast and has not yet proven to have any duplicates. Even if SHA-2 and SHA-3 are better for cryptographically 034 * secure purposes, it is doubtful whether a repository needs more than SHA-1 for identity purposes. 035 * 036 * @author Randall Hauch 037 */ 038 @Embeddable 039 @Immutable 040 @org.hibernate.annotations.Immutable 041 public class LargeValueId implements Serializable { 042 043 /** 044 * Version {@value} 045 */ 046 private static final long serialVersionUID = 1L; 047 048 @Column( name = "SHA1", nullable = false, length = 40 ) 049 private String hash; 050 051 public LargeValueId() { 052 } 053 054 public LargeValueId( String hash ) { 055 this.hash = hash; 056 } 057 058 /** 059 * @return hash 060 */ 061 public String getHash() { 062 return hash; 063 } 064 065 /** 066 * {@inheritDoc} 067 * 068 * @see java.lang.Object#hashCode() 069 */ 070 @Override 071 public int hashCode() { 072 return hash.hashCode(); 073 } 074 075 /** 076 * {@inheritDoc} 077 * 078 * @see java.lang.Object#equals(java.lang.Object) 079 */ 080 @Override 081 public boolean equals( Object obj ) { 082 if (obj == this) return true; 083 if (obj instanceof LargeValueId) { 084 LargeValueId that = (LargeValueId)obj; 085 return this.hash.equals(that.hash); 086 } 087 return false; 088 } 089 090 /** 091 * {@inheritDoc} 092 * 093 * @see java.lang.Object#toString() 094 */ 095 @Override 096 public String toString() { 097 return "Large value " + hash; 098 } 099 100 }