pipebinaryid.java

jxta平台的开发包

/*
 *
 * $Id: PipeBinaryID.java,v 1.8 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.*;

import net.jxta.peergroup.PeerGroupID;
import org.apache.log4j.Logger;
import org.apache.log4j.Level;


/**
 * This class implements a Pipe ID. Each pipe is assigned a unique id.
 *
 * @author Daniel Brookshier <a HREF="mailto:[e-mail]">[e-mail]</a>
 *
 * @see net.jxta.id.ID
 * @see net.jxta.id.IDFactory
 * @see net.jxta.peergroup.PeerGroupID
 */
public final class PipeBinaryID extends net.jxta.pipe.PipeID { 
    /** LOG object for this class. */
    private final static transient Logger LOG = Logger.getLogger(PipeBinaryID.class.getName());
    
    /** The id data */
    protected String id;
    
    /**
     * Used only internally
     */
    protected PipeBinaryID() {
        super();
    }
        /** 
     * Creates a ID from a string. Note that the ID is not currently validated.
     * @param id Value of ID.
     */
   
    protected PipeBinaryID(String id){
        super();
        this.id = id;
        
    }
    /**
     * Constructor. Intializes contents from provided ID.
     *
     * @param id    the ID data
     */
    PipeBinaryID(BinaryID id) {
        super();
        this.id = id.getID();
    }
    
    /**
     * Constructor. Creates a PipeID. A PeerGroupID is provided.  Note that only
     * the peer group's primary node is used to  build this node. We don't want
     * to be appending great grand parents.
     *
     * @param parent    the group to which this will belong.
     * @param data DOCUMENT ME!
     * @param lengthIncluded DOCUMENT ME!
     */
    public PipeBinaryID(net.jxta.peergroup.PeerGroupID parent, byte[] data, boolean lengthIncluded) {
        this();
        
        String parentStr = IDFormat.childGroup(parent);
        id = BinaryIDFactory.newBinaryID(BinaryID.flagPipeID, data, lengthIncluded).getID() +"."+parentStr.replace('-','.');
    }
    
    /**
     * {@inheritDoc}
     */
    public boolean equals(Object target) {
       boolean result = false;
        if (this == target) {
            result = true;
        } else if ((id != null) && target instanceof PipeBinaryID &&  getUniqueValue().equals(((PipeBinaryID) target).getUniqueValue())) {
            result = true;
        } else if(target instanceof String && getURL( ).toString().equals(target)) {
            result = true;
        } else if (id == null && target.equals(net.jxta.id.ID.nullID) ){
            result = true;
        } 
        return result;
      }
    
    /**
     * {@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 Returns the raw string used to create the urn!
     */
    protected String getID() {
        return id;
    }
}