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.contribution; 023 024 import java.util.Iterator; 025 import net.jcip.annotations.Immutable; 026 import org.jboss.dna.graph.Location; 027 import org.jboss.dna.graph.properties.DateTime; 028 029 /** 030 * The record of a source contributing only two children to a node. 031 * 032 * @author Randall Hauch 033 */ 034 @Immutable 035 public class TwoChildContribution extends NonEmptyContribution { 036 037 /** 038 * This is the first version of this class. See the documentation of MergePlan.serialVersionUID. 039 */ 040 private static final long serialVersionUID = 1L; 041 042 private final Location child1; 043 private final Location child2; 044 045 /** 046 * Create a contribution of two children from the source with the supplied name. 047 * 048 * @param sourceName the name of the source, which may not be null or blank 049 * @param locationInSource the path in the source for this contributed information; may not be null 050 * @param expirationTime the time (in UTC) after which this contribution should be considered expired, or null if there is no 051 * expiration time 052 * @param child1 the first child contributed from the source; may not be null 053 * @param child2 the second child contributed from the source; may not be null 054 */ 055 public TwoChildContribution( String sourceName, 056 Location locationInSource, 057 DateTime expirationTime, 058 Location child1, 059 Location child2 ) { 060 super(sourceName, locationInSource, expirationTime); 061 assert child1 != null; 062 assert child2 != null; 063 this.child1 = child1; 064 this.child2 = child2; 065 if (ContributionStatistics.RECORD) ContributionStatistics.record(0, 2); 066 } 067 068 /** 069 * {@inheritDoc} 070 * 071 * @see org.jboss.dna.connector.federation.contribution.Contribution#getChildren() 072 */ 073 @Override 074 public Iterator<Location> getChildren() { 075 return new TwoValueIterator<Location>(child1, child2); 076 } 077 078 /** 079 * {@inheritDoc} 080 * 081 * @see org.jboss.dna.connector.federation.contribution.Contribution#getChildrenCount() 082 */ 083 @Override 084 public int getChildrenCount() { 085 return 2; 086 } 087 088 }