001 /*
002 * JBoss, Home of Professional Open Source.
003 * Copyright 2008, Red Hat Middleware LLC, and individual contributors
004 * as indicated by the @author tags. See the copyright.txt file in the
005 * distribution for a full listing of individual contributors.
006 *
007 * This is free software; you can redistribute it and/or modify it
008 * under the terms of the GNU Lesser General Public License as
009 * published by the Free Software Foundation; either version 2.1 of
010 * the License, or (at your option) any later version.
011 *
012 * This software is distributed in the hope that it will be useful,
013 * but WITHOUT ANY WARRANTY; without even the implied warranty of
014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
015 * Lesser General Public License for more details.
016 *
017 * You should have received a copy of the GNU Lesser General Public
018 * License along with this software; if not, write to the Free
019 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
020 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
021 */
022 package org.jboss.dna.connector.federation.merge;
023
024 import java.util.Iterator;
025 import java.util.NoSuchElementException;
026 import net.jcip.annotations.ThreadSafe;
027 import org.jboss.dna.common.util.HashCode;
028 import org.jboss.dna.connector.federation.contribution.Contribution;
029
030 /**
031 * @author Randall Hauch
032 */
033 @ThreadSafe
034 public class ThreeContributionMergePlan extends MergePlan {
035
036 private static final long serialVersionUID = 1L;
037 private final Contribution contribution1;
038 private final Contribution contribution2;
039 private final Contribution contribution3;
040
041 /**
042 * @param contribution1 the first contribution for this merge plan
043 * @param contribution2 the second contribution for this merge plan
044 * @param contribution3 the third contribution for this merge plan
045 */
046 /*package*/ThreeContributionMergePlan( Contribution contribution1,
047 Contribution contribution2,
048 Contribution contribution3 ) {
049 assert contribution1 != null;
050 assert contribution2 != null;
051 assert contribution3 != null;
052 this.contribution1 = contribution1;
053 this.contribution2 = contribution2;
054 this.contribution3 = contribution3;
055 assert checkEachContributionIsFromDistinctSource();
056 }
057
058 /**
059 * {@inheritDoc}
060 *
061 * @see org.jboss.dna.connector.federation.merge.MergePlan#getContributionCount()
062 */
063 @Override
064 public int getContributionCount() {
065 return 3;
066 }
067
068 /**
069 * {@inheritDoc}
070 *
071 * @see org.jboss.dna.connector.federation.merge.MergePlan#getContributionFrom(java.lang.String)
072 */
073 @Override
074 public Contribution getContributionFrom( String sourceName ) {
075 if (contribution1.getSourceName().equals(sourceName)) return contribution1;
076 if (contribution2.getSourceName().equals(sourceName)) return contribution2;
077 if (contribution3.getSourceName().equals(sourceName)) return contribution3;
078 return null;
079 }
080
081 /**
082 * {@inheritDoc}
083 *
084 * @see java.lang.Iterable#iterator()
085 */
086 public Iterator<Contribution> iterator() {
087 return new Iterator<Contribution>() {
088 private int next = 3;
089
090 public boolean hasNext() {
091 return next > 0;
092 }
093
094 @SuppressWarnings( "synthetic-access" )
095 public Contribution next() {
096 if (next == 3) {
097 next = 2;
098 return contribution1;
099 }
100 if (next == 2) {
101 next = 1;
102 return contribution2;
103 }
104 if (next == 1) {
105 next = 0;
106 return contribution3;
107 }
108 throw new NoSuchElementException();
109 }
110
111 public void remove() {
112 throw new UnsupportedOperationException();
113 }
114 };
115 }
116
117 /**
118 * {@inheritDoc}
119 *
120 * @see org.jboss.dna.connector.federation.merge.MergePlan#isSource(java.lang.String)
121 */
122 @Override
123 public boolean isSource( String sourceName ) {
124 if (contribution1.getSourceName().equals(sourceName)) return true;
125 if (contribution2.getSourceName().equals(sourceName)) return true;
126 if (contribution3.getSourceName().equals(sourceName)) return true;
127 return false;
128 }
129
130 /**
131 * {@inheritDoc}
132 *
133 * @see java.lang.Object#hashCode()
134 */
135 @Override
136 public int hashCode() {
137 return HashCode.compute(contribution1, contribution2, contribution3);
138 }
139
140 }