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 ThreeContributionMergePlan extends MergePlan {
037
038 private static final long serialVersionUID = 1L;
039 private final Contribution contribution1;
040 private final Contribution contribution2;
041 private final Contribution contribution3;
042
043 /**
044 * @param contribution1 the first contribution for this merge plan
045 * @param contribution2 the second contribution for this merge plan
046 * @param contribution3 the third contribution for this merge plan
047 */
048 /*package*/ThreeContributionMergePlan( Contribution contribution1,
049 Contribution contribution2,
050 Contribution contribution3 ) {
051 assert contribution1 != null;
052 assert contribution2 != null;
053 assert contribution3 != null;
054 this.contribution1 = contribution1;
055 this.contribution2 = contribution2;
056 this.contribution3 = contribution3;
057 assert checkEachContributionIsFromDistinctSource();
058 }
059
060 /**
061 * {@inheritDoc}
062 *
063 * @see org.jboss.dna.connector.federation.merge.MergePlan#getContributionCount()
064 */
065 @Override
066 public int getContributionCount() {
067 return 3;
068 }
069
070 /**
071 * {@inheritDoc}
072 *
073 * @see org.jboss.dna.connector.federation.merge.MergePlan#getContributionFrom(java.lang.String)
074 */
075 @Override
076 public Contribution getContributionFrom( String sourceName ) {
077 if (contribution1.getSourceName().equals(sourceName)) return contribution1;
078 if (contribution2.getSourceName().equals(sourceName)) return contribution2;
079 if (contribution3.getSourceName().equals(sourceName)) return contribution3;
080 return null;
081 }
082
083 /**
084 * {@inheritDoc}
085 *
086 * @see java.lang.Iterable#iterator()
087 */
088 public Iterator<Contribution> iterator() {
089 return new Iterator<Contribution>() {
090 private int next = 3;
091
092 public boolean hasNext() {
093 return next > 0;
094 }
095
096 @SuppressWarnings( "synthetic-access" )
097 public Contribution next() {
098 if (next == 3) {
099 next = 2;
100 return contribution1;
101 }
102 if (next == 2) {
103 next = 1;
104 return contribution2;
105 }
106 if (next == 1) {
107 next = 0;
108 return contribution3;
109 }
110 throw new NoSuchElementException();
111 }
112
113 public void remove() {
114 throw new UnsupportedOperationException();
115 }
116 };
117 }
118
119 /**
120 * {@inheritDoc}
121 *
122 * @see org.jboss.dna.connector.federation.merge.MergePlan#isSource(java.lang.String)
123 */
124 @Override
125 public boolean isSource( String sourceName ) {
126 if (contribution1.getSourceName().equals(sourceName)) return true;
127 if (contribution2.getSourceName().equals(sourceName)) return true;
128 if (contribution3.getSourceName().equals(sourceName)) return true;
129 return false;
130 }
131
132 /**
133 * {@inheritDoc}
134 *
135 * @see java.lang.Object#hashCode()
136 */
137 @Override
138 public int hashCode() {
139 return HashCode.compute(contribution1, contribution2, contribution3);
140 }
141
142 }