instantiator.java

jxta_src_2.41b jxta 2.41b 最新版源码 from www.jxta.org

/************************************************************************
 *
 * $Id: Instantiator.java,v 1.6 2006/07/20 19:23:36 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 net.jxta.peergroup.*;
import java.io.InputStream;
import java.net.URL;

import java.io.IOException;
import java.net.MalformedURLException;
import java.net.UnknownServiceException;

import java.util.Random;
import java.security.SecureRandom;
import org.apache.log4j.Logger;
import org.apache.log4j.Level;

/**
 * ID Factory for the binary ID type. All identifiers in this type are prefixed by "binaryid".
 * @author Daniel Brookshier <a HREF="mailto:[e-mail]">[e-mail]</a>
 */

public final class Instantiator implements net.jxta.id.IDFactory.Instantiator {
    /** LOG object for this class. */
    private final static transient Logger LOG = Logger.getLogger(Instantiator.class.getName());    
    /**
     *  Our ID Format
     **/
    final static String BinaryIDEncoded = "binaryid";
    /** Random generator used for ID creation where a seed (idValue) is not provided. */
    private Random randNumGenerator;

    /**
     * {@inheritDoc}
     **/
    public String getSupportedIDFormat() {
        return BinaryIDEncoded;
    }
    
    /**
     * {@inheritDoc}
     **/
    public net.jxta.id.ID fromURL( URL source ) throws MalformedURLException, UnknownServiceException {
        
        net.jxta.id.ID result = null;
        
        // check the protocol
        if ( !net.jxta.id.ID.URIEncodingName.equalsIgnoreCase(source.getProtocol()) ){
            throw new UnknownServiceException( "URI protocol type was not as expected." );
        }
        
        String  encoded = source.getFile();
        
        int colonAt = encoded.indexOf( ':' );
        
        // There's a colon right?
        if( -1 == colonAt ){
            throw new UnknownServiceException( "URN namespace was missing." );
        }
        
        // check the namespace
        if ( !net.jxta.id.ID.URNNamespace.equalsIgnoreCase(encoded.substring( 0, colonAt )) )
            throw new UnknownServiceException( "URN namespace was not as expected." );
        
        // skip the namespace portion and the colon
        encoded = encoded.substring( colonAt + 1 );
        
        int dashAt = encoded.indexOf( '-' );
        
        // there's a dash, right?
        if( -1 == dashAt ){
            throw new UnknownServiceException( "URN Encodingtype was missing." );
        }
        
        if( !encoded.substring( 0, dashAt).equals( BinaryIDEncoded ) ){
            throw new UnknownServiceException( "JXTA id format was not as expected. Should have been BinaryIDEncoded found:"+encoded.substring( 0, dashAt) );
        }
        
        // skip the dash
        encoded = encoded.substring( dashAt + 1 );
        // check that the length is long enough
        if( encoded.length() < 1 ){
            throw new MalformedURLException( "URN does not contain enough chars. Must have at least one byte" );
        }
        BinaryID id = new BinaryID(encoded);
        
        switch( id.type() ) {
            
            case BinaryID.flagCodatID :
                result = new CodatBinaryID(encoded);
            case BinaryID.flagPeerGroupID :
                result = new PeerGroupBinaryID(encoded);
                if( PeerGroupID.worldPeerGroupID.equals( result ) ){
                    result = net.jxta.peergroup.PeerGroupID.worldPeerGroupID;
                }
                break;
            case BinaryID.flagPeerID :
                result = new PeerBinaryID(encoded);
                break;
            case BinaryID.flagPipeID :
                result = new PipeBinaryID(encoded);
                break;
                
            case BinaryID.flagModuleClassID :
                result = new ModuleClassBinaryID(encoded);
                break;
            case BinaryID.flagModuleSpecID :
                result = new ModuleSpecBinaryID(encoded);
                break;
                
            default :
                throw new MalformedURLException( "jxta ID type not recognized" );
        }
        
        return result;
    }
    /**
     * Utility to create a random array of bits to be used when a random value is required.
     */
    private synchronized byte[] randomID(){
        byte[] randBuf16 = new byte[16];
        if (randNumGenerator ==null) {
            try {
                randNumGenerator = new SecureRandom();
            }catch( Throwable everything ) {
                randNumGenerator = new Random();
            }
        }        
        randNumGenerator.nextBytes(randBuf16);
        return randBuf16;
    }
    /**
     * {@inheritDoc}
     * @throws UnsupportedOperationException This form is not supported. Use CODAT from UUID package instead.
     **/
    public net.jxta.codat.CodatID newCodatID( final net.jxta.peergroup.PeerGroupID groupID ) {
        PeerGroupID  parentGroupID = (PeerGroupID) IDFormat.translateFromWellKnown( groupID );
        return new  net.jxta.impl.id.binaryID.CodatBinaryID(parentGroupID, randomID(), false);   
        //throw new UnsupportedOperationException("This form is not supported. Use CODAT from UUID package instead.");
    }
    
    /**
     * {@inheritDoc}
     * @throws UnsupportedOperationException This form is not supported. Use CODAT from UUID package instead.
     **/
    public net.jxta.codat.CodatID newCodatID( final net.jxta.peergroup.PeerGroupID groupID, byte [] seed ) {
        PeerGroupID  parentGroupID = (PeerGroupID) IDFormat.translateFromWellKnown( groupID );
        return new  net.jxta.impl.id.binaryID.CodatBinaryID(parentGroupID, seed, false);   
    }
    
    /**
     * {@inheritDoc}
     * @throws UnsupportedOperationException This form is not supported. Use CODAT from UUID package instead.
     **/
    public net.jxta.codat.CodatID newCodatID(final net.jxta.peergroup.PeerGroupID groupID, InputStream in) throws IOException {
        PeerGroupID  parentGroupID = (PeerGroupID) IDFormat.translateFromWellKnown( groupID );
        return new  net.jxta.impl.id.binaryID.CodatBinaryID(parentGroupID, randomID(), false); 
    }
    
    /**
     * {@inheritDoc}
     * @throws UnsupportedOperationException This form is not supported. Use CODAT from UUID package instead.
     **/
    public net.jxta.codat.CodatID newCodatID(final net.jxta.peergroup.PeerGroupID groupID, byte [] idValue, InputStream in) throws IOException {
        PeerGroupID  parentGroupID = (PeerGroupID) IDFormat.translateFromWellKnown( groupID );
        return new  net.jxta.impl.id.binaryID.CodatBinaryID(parentGroupID, idValue, false);   
    }
    
    /**
     * {@inheritDoc}
     **/
    public net.jxta.peer.PeerID newPeerID( final  net.jxta.peergroup.PeerGroupID groupID ) {
         LOG.error("random peer created",new RuntimeException());
         PeerGroupID  parentGroupID = (PeerGroupID) IDFormat.translateFromWellKnown( groupID );
        return new  net.jxta.impl.id.binaryID.PeerBinaryID(parentGroupID, randomID(), false); 
    }
    
    /**
     * {@inheritDoc}
     **/
    public net.jxta.peer.PeerID newPeerID( final  net.jxta.peergroup.PeerGroupID groupID, byte[] idValue ) {
        PeerGroupID  parentGroupID = (PeerGroupID) IDFormat.translateFromWellKnown( groupID );
        return new  net.jxta.impl.id.binaryID.PeerBinaryID(parentGroupID, idValue, false); 
    }
    
    /**
     * {@inheritDoc}
     **/
    public net.jxta.peergroup.PeerGroupID newPeerGroupID( ) {
        return net.jxta.id.IDFactory.newPeerGroupID(randomID());
    }
    
    /**
     * {@inheritDoc}
     **/
    public net.jxta.peergroup.PeerGroupID newPeerGroupID( byte [] idValue ) {
        return new  PeerGroupBinaryID(idValue,false );
    }
    
    /**
     * {@inheritDoc}
     **/
    public net.jxta.peergroup.PeerGroupID newPeerGroupID( net.jxta.peergroup.PeerGroupID parent ) {
        LOG.error("random peergroup created",new RuntimeException());
        PeerGroupID  parentGroupID = (PeerGroupID) IDFormat.translateFromWellKnown( parent );
        return net.jxta.id.IDFactory.newPeerGroupID(parentGroupID, randomID());
    }
    
    /**
     * {@inheritDoc}
     **/
    public net.jxta.peergroup.PeerGroupID newPeerGroupID( net.jxta.peergroup.PeerGroupID parent, byte [] idValue ) {
        PeerGroupID  parentGroupID = (PeerGroupID) IDFormat.translateFromWellKnown( parent );
        return new  PeerGroupBinaryID( parentGroupID, idValue,false );
    }
    
    /**
     * {@inheritDoc}
     **/
    public net.jxta.pipe.PipeID newPipeID( final net.jxta.peergroup.PeerGroupID groupID ) {
        PeerGroupID  parentGroupID = (PeerGroupID) IDFormat.translateFromWellKnown( groupID );
        return net.jxta.id.IDFactory.newPipeID(parentGroupID, randomID());
    }
    
    /**
     * {@inheritDoc}
     **/
    public net.jxta.pipe.PipeID newPipeID(  final net.jxta.peergroup.PeerGroupID groupID, byte [] idValue ) {
        PeerGroupID  peerGroupID = (PeerGroupID) IDFormat.translateFromWellKnown( groupID );
        return new PipeBinaryID( peerGroupID, idValue,false );
    }
    
    /**
     * {@inheritDoc}
     * @throws UnsupportedOperationException This form is not supported because a binary ID is meant to be created with a random ID.
     **/
    public net.jxta.platform.ModuleClassID newModuleClassID( ) {
        throw new UnsupportedOperationException("This form is not supported because a binary ID is meant to be created with a random ID. Use UUID package instead.");
    }
    
    /**
     * {@inheritDoc}
     * @throws UnsupportedOperationException This form is not supported because a binary ID is meant to be created with a random ID.
     **/
    public net.jxta.platform.ModuleClassID newModuleClassID( final net.jxta.platform.ModuleClassID classID ) {
        throw new UnsupportedOperationException("This form is not supported because a binary ID is meant to be created with a random ID. Use UUID package instead.");
    }
    
    /**
     * {@inheritDoc}
     * @throws UnsupportedOperationException This form is not supported because a binary ID is meant to be created with a random ID. Use UUID instead.
     **/
    public net.jxta.platform.ModuleSpecID newModuleSpecID( final net.jxta.platform.ModuleClassID classID ) {
        throw new UnsupportedOperationException("This form is not supported because a binary ID is meant to be created with a random ID. Use UUID package instead.");
    }
    
}