/** * $RCSfile: $ * $Revision: $ * $Date: $ * * Copyright (C) 2005-2008 Jive Software. All rights reserved. * * This software is published under the terms of the GNU Public License (GPL), * a copy of which is included in this distribution, or a commercial license * agreement with Jive. */ package org.jivesoftware.openfire.cluster; import org.jivesoftware.util.cache.ExternalizableUtil; import java.io.Externalizable; import java.io.IOException; import java.io.ObjectInput; import java.io.ObjectOutput; import java.util.ArrayList; import java.util.Arrays; import java.util.List; /** * Class which wraps the byte[] we use to identify cluster members. The main reason * for this class is that byte[] cannot be directly compared so having a collection * of byte[] is not possible since you cannot remove to equivalent byte[] from the * collection.<p> * * @author Pete Matern * @author Gaston Dombiak */ public class NodeID implements Externalizable { private static List<NodeID> instances = new ArrayList<NodeID>(); private byte[] nodeID; public static synchronized NodeID getInstance(byte[] nodeIdBytes) { for (NodeID nodeID : instances) { if (nodeID.equals(nodeIdBytes)) { return nodeID; } } NodeID answer = new NodeID(nodeIdBytes); instances.add(answer); return answer; } public static synchronized void deleteInstance(byte[] nodeIdBytes) { NodeID toDelete = null; for (NodeID nodeID : instances) { if (nodeID.equals(nodeIdBytes)) { toDelete = nodeID; break; } } if (toDelete != null) { instances.remove(toDelete); } } public NodeID() { } private NodeID(byte[] nodeIdBytes) { this.nodeID = nodeIdBytes; } public boolean equals(byte[] anotherID) { return Arrays.equals(nodeID, anotherID); } public boolean equals(Object o) { if (this == o) return true; if (o == null || getClass() != o.getClass()) return false; NodeID that = (NodeID) o; return Arrays.equals(nodeID, that.nodeID); } public int hashCode() { return Arrays.hashCode(nodeID); } public byte[] toByteArray() { return nodeID; } public void writeExternal(ObjectOutput out) throws IOException { ExternalizableUtil.getInstance().writeByteArray(out, nodeID); } public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException { nodeID = ExternalizableUtil.getInstance().readByteArray(in); } }