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.graph.property.basic;
025    
026    import java.io.ByteArrayInputStream;
027    import java.io.InputStream;
028    import net.jcip.annotations.Immutable;
029    import org.jboss.dna.common.util.CheckArg;
030    import org.jboss.dna.graph.property.Binary;
031    
032    /**
033     * An implementation of {@link Binary} that keeps the binary data in-memory.
034     * 
035     * @author Randall Hauch
036     */
037    @Immutable
038    public class InMemoryBinary extends AbstractBinary {
039    
040        /**
041         * Version {@value} .
042         */
043        private static final long serialVersionUID = 2L;
044    
045        private final byte[] bytes;
046        private byte[] sha1hash;
047        private int hc;
048    
049        public InMemoryBinary( byte[] bytes ) {
050            CheckArg.isNotNull(bytes, "bytes");
051            this.bytes = bytes;
052        }
053    
054        /**
055         * {@inheritDoc}
056         * 
057         * @see java.lang.Object#hashCode()
058         */
059        @Override
060        public int hashCode() {
061            if (sha1hash == null) {
062                // Idempotent, so doesn't matter if we recompute in concurrent threads ...
063                sha1hash = computeHash(bytes);
064                hc = sha1hash.hashCode();
065            }
066            return hc;
067        }
068    
069        /**
070         * {@inheritDoc}
071         */
072        public long getSize() {
073            return this.bytes.length;
074        }
075    
076        /**
077         * {@inheritDoc}
078         * 
079         * @see org.jboss.dna.graph.property.Binary#getHash()
080         */
081        public byte[] getHash() {
082            if (sha1hash == null) {
083                // Idempotent, so doesn't matter if we recompute in concurrent threads ...
084                sha1hash = computeHash(bytes);
085                hc = sha1hash.hashCode();
086            }
087            return sha1hash;
088        }
089    
090        /**
091         * {@inheritDoc}
092         */
093        public byte[] getBytes() {
094            return this.bytes;
095        }
096    
097        /**
098         * {@inheritDoc}
099         */
100        public InputStream getStream() {
101            return new ByteArrayInputStream(this.bytes);
102        }
103    
104        /**
105         * {@inheritDoc}
106         */
107        public void acquire() {
108            // do nothing
109        }
110    
111        /**
112         * {@inheritDoc}
113         */
114        public void release() {
115            // do nothing
116        }
117    }