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