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 FourContributionMergePlan 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 private final Contribution contribution4;
043
044 /**
045 * @param contribution1 the first contribution for this merge plan
046 * @param contribution2 the second contribution for this merge plan
047 * @param contribution3 the third contribution for this merge plan
048 * @param contribution4 the fourth contribution for this merge plan
049 */
050 /*package*/FourContributionMergePlan( Contribution contribution1,
051 Contribution contribution2,
052 Contribution contribution3,
053 Contribution contribution4 ) {
054 assert contribution1 != null;
055 assert contribution2 != null;
056 assert contribution3 != null;
057 assert contribution4 != null;
058 this.contribution1 = contribution1;
059 this.contribution2 = contribution2;
060 this.contribution3 = contribution3;
061 this.contribution4 = contribution4;
062 assert checkEachContributionIsFromDistinctSource();
063 }
064
065 /**
066 * {@inheritDoc}
067 *
068 * @see org.jboss.dna.connector.federation.merge.MergePlan#getContributionCount()
069 */
070 @Override
071 public int getContributionCount() {
072 return 4;
073 }
074
075 /**
076 * {@inheritDoc}
077 *
078 * @see org.jboss.dna.connector.federation.merge.MergePlan#getContributionFrom(java.lang.String)
079 */
080 @Override
081 public Contribution getContributionFrom( String sourceName ) {
082 if (contribution1.getSourceName().equals(sourceName)) return contribution1;
083 if (contribution2.getSourceName().equals(sourceName)) return contribution2;
084 if (contribution3.getSourceName().equals(sourceName)) return contribution3;
085 if (contribution4.getSourceName().equals(sourceName)) return contribution4;
086 return null;
087 }
088
089 /**
090 * {@inheritDoc}
091 *
092 * @see java.lang.Iterable#iterator()
093 */
094 public Iterator<Contribution> iterator() {
095 return new Iterator<Contribution>() {
096 private int next = 4;
097
098 public boolean hasNext() {
099 return next > 0;
100 }
101
102 @SuppressWarnings( "synthetic-access" )
103 public Contribution next() {
104 if (next == 4) {
105 next = 3;
106 return contribution1;
107 }
108 if (next == 3) {
109 next = 2;
110 return contribution2;
111 }
112 if (next == 2) {
113 next = 1;
114 return contribution3;
115 }
116 if (next == 1) {
117 next = 0;
118 return contribution4;
119 }
120 throw new NoSuchElementException();
121 }
122
123 public void remove() {
124 throw new UnsupportedOperationException();
125 }
126 };
127 }
128
129 /**
130 * {@inheritDoc}
131 *
132 * @see org.jboss.dna.connector.federation.merge.MergePlan#isSource(java.lang.String)
133 */
134 @Override
135 public boolean isSource( String sourceName ) {
136 if (contribution1.getSourceName().equals(sourceName)) return true;
137 if (contribution2.getSourceName().equals(sourceName)) return true;
138 if (contribution3.getSourceName().equals(sourceName)) return true;
139 if (contribution4.getSourceName().equals(sourceName)) return true;
140 return false;
141 }
142
143 /**
144 * {@inheritDoc}
145 *
146 * @see java.lang.Object#hashCode()
147 */
148 @Override
149 public int hashCode() {
150 return HashCode.compute(contribution1, contribution2, contribution3, contribution4);
151 }
152
153 }