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.federation.merge;
025
026 import java.util.Iterator;
027 import java.util.NoSuchElementException;
028 import net.jcip.annotations.ThreadSafe;
029 import org.jboss.dna.common.util.HashCode;
030 import org.jboss.dna.connector.federation.contribution.Contribution;
031
032 /**
033 * @author Randall Hauch
034 */
035 @ThreadSafe
036 public class TwoContributionMergePlan extends MergePlan {
037
038 private static final long serialVersionUID = 1L;
039 private final Contribution contribution1;
040 private final Contribution contribution2;
041
042 /**
043 * @param contribution1 the first contribution for this merge plan
044 * @param contribution2 the second contribution for this merge plan
045 */
046 /*package*/TwoContributionMergePlan( Contribution contribution1,
047 Contribution contribution2 ) {
048 assert contribution1 != null;
049 assert contribution2 != null;
050 this.contribution1 = contribution1;
051 this.contribution2 = contribution2;
052 assert checkEachContributionIsFromDistinctSource();
053 }
054
055 /**
056 * {@inheritDoc}
057 *
058 * @see org.jboss.dna.connector.federation.merge.MergePlan#getContributionCount()
059 */
060 @Override
061 public int getContributionCount() {
062 return 2;
063 }
064
065 /**
066 * {@inheritDoc}
067 *
068 * @see org.jboss.dna.connector.federation.merge.MergePlan#getContributionFrom(java.lang.String)
069 */
070 @Override
071 public Contribution getContributionFrom( String sourceName ) {
072 if (contribution1.getSourceName().equals(sourceName)) return contribution1;
073 if (contribution2.getSourceName().equals(sourceName)) return contribution2;
074 return null;
075 }
076
077 /**
078 * {@inheritDoc}
079 *
080 * @see java.lang.Iterable#iterator()
081 */
082 public Iterator<Contribution> iterator() {
083 return new Iterator<Contribution>() {
084 private int next = 2;
085
086 public boolean hasNext() {
087 return next > 0;
088 }
089
090 @SuppressWarnings( "synthetic-access" )
091 public Contribution next() {
092 if (next == 2) {
093 next = 1;
094 return contribution1;
095 }
096 if (next == 1) {
097 next = 0;
098 return contribution2;
099 }
100 throw new NoSuchElementException();
101 }
102
103 public void remove() {
104 throw new UnsupportedOperationException();
105 }
106 };
107 }
108
109 /**
110 * {@inheritDoc}
111 *
112 * @see org.jboss.dna.connector.federation.merge.MergePlan#isSource(java.lang.String)
113 */
114 @Override
115 public boolean isSource( String sourceName ) {
116 return contribution1.getSourceName().equals(sourceName) || contribution2.getSourceName().equals(sourceName);
117 }
118
119 /**
120 * {@inheritDoc}
121 *
122 * @see java.lang.Object#hashCode()
123 */
124 @Override
125 public int hashCode() {
126 return HashCode.compute(contribution1, contribution2);
127 }
128
129 }