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