peerbinaryid.java

jxta平台的开发包

/*
 *
 * $Id: PeerBinaryID.java,v 1.7 2006/07/20 19:23:35 bondolo Exp $
 *
 * Copyright (c) 2001 Sun Microsystems, Inc.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *       Sun Microsystems, Inc. for Project JXTA."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Sun", "Sun Microsystems, Inc.", "JXTA" and "Project JXTA"
 *    must not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact Project JXTA at http://www.jxta.org.
 *
 * 5. Products derived from this software may not be called "JXTA",
 *    nor may "JXTA" appear in their name, without prior written
 *    permission of Sun.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL SUN MICROSYSTEMS OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of Project JXTA.  For more
 * information on Project JXTA, please see
 * <http://www.jxta.org/>.
 *
 * This license is based on the BSD license adopted by the Apache Foundation.
 */
package net.jxta.impl.id.binaryID;

import java.net.URL;
import org.apache.log4j.Logger;
import org.apache.log4j.Level;


/**
 * This class implements a PeerID. Each peer is assigned a unique peer id.UUID
 * id are used to implement peer id.
 *
 * @see net.jxta.impl.id.UUID.UUID
 * @see net.jxta.impl.id.UUID.UUIDFactory
 */
public final class PeerBinaryID extends net.jxta.peer.PeerID {
    /** LOG object form this class */
    private final static transient Logger LOG = Logger.getLogger(PeerBinaryID.class.getName());
    
    /** This is the id string used in the XML of the id. The format is TX0..Xn where T is the type and X0 through Xn are the base64 encoded id.*/
    private String id;
    
    /**
     * Constructor. Used only internally.
     */
    private PeerBinaryID() {
        super();
    }
       /** 
     * Creates a ID from a string. Note that the ID is not currently validated.
     * @param id Value of ID.
     */
 
    protected PeerBinaryID(String id){
        super();
        this.id = id;
       
    }
    
    /**
     * Creates a new PeerID object.
     *
     * @param binaryID binary id to build the peerID from.
     */
    public PeerBinaryID(BinaryID binaryID) {
        id = binaryID.getID();
    }
    
    /**
     * Constructor. Creates a PeerID. A PeerGroupID and BinaryID is provided. If
     * the  binary ID is not a pipe ID, the construcion will throw a  runtime
     * exception.<p>
     *
     * Note that only the ID for the parent is obtained and not the
     * parent and the grandparent.
     *
     * @param parent    the group to which this will belong.
     * @param data data byte array to be used as the id.
     * @param lengthIncluded If true, the first byte in the data array is the length of the remaining bytes.
     */
    public PeerBinaryID(net.jxta.peergroup.PeerGroupID parent, byte[] data, boolean lengthIncluded) {
        this();
        
        String parentStr = IDFormat.childGroup(parent); 
        
        id = BinaryIDFactory.newBinaryID(BinaryID.flagPeerID, data,lengthIncluded).getID()+"."+parentStr.replace('-','.');
    }
    
    /**
     * {@inheritDoc}
     */
    public boolean equals(Object target) {
        if (this == target) {
            return true;
        } else if ((id != null) && target instanceof PeerBinaryID && getUniqueValue().equals(((PeerBinaryID) target).getUniqueValue())) {
            return true;
        } else if(target instanceof String && getURL( ).toString().equals(target)) {
            return true;
        }else{
            return false;
        }
    }
    
    /**
     * {@inheritDoc}
     */
    public int hashCode() {
        return getUniqueValue().hashCode();
    }
    
    /**
     * {@inheritDoc}
     */
    public String getIDFormat() {
        return IDFormat.INSTANTIATOR.getSupportedIDFormat();
    }
    
    /**
     * {@inheritDoc}
     */
    public Object getUniqueValue() {
        return getIDFormat() + "-" + (String) id;
    }
    
   /**
     * {@inheritDoc}
     */
    public net.jxta.id.ID getPeerGroupID() {
         try{
            if (id == null){
                return (net.jxta.peergroup.PeerGroupID)net.jxta.id.ID.nullID;
            }
            String idd = id;
            int parentStart = idd.indexOf('.');
            if (parentStart != -1) {
                idd = idd.substring(parentStart + 1);
            } else {
                return null; 
            }
            
            URL url = new URL("urn:jxta:"+idd.replace('.','-'));
            net.jxta.peergroup.PeerGroupID peerGroupID = (net.jxta.peergroup.PeerGroupID)net.jxta.id.IDFactory.fromURL(url);
            return peerGroupID;
        }catch(Exception e ){
            if (LOG.isEnabledFor(Level.WARN)) {
                LOG.warn("cannot convert sub group. ID value = "+id);
            }
            return null; 
            
        }
    }    

    
    /**
     * returns the coded ID without the binaryid tag.
     *
     * @return The raw ID.
     */
    protected String getID() {
        return id;
    }
}