instantiator.java

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

/************************************************************************
 *
 * $Id: Instantiator.java,v 1.10 2005/12/07 04:41:02 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.UUID;

import java.io.InputStream;
import java.net.URI;
import java.net.URL;

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

import net.jxta.id.IDFactory;

/**
 *  The instantiator for the UUID ID Format.
 *
 *  <p/>For "seed" varient constructors, the first 16 bytes of the seed are used
 *  literally as the UUID value. The value is masked to make it a valid version 4
 *  IETF varient UUID.
 **/
public class Instantiator implements IDFactory.URIInstantiator {
    
    /**
     *  Our ID Format
     **/
    final static String UUIDEncoded = "uuid";
    
    /**
     * {@inheritDoc}
     **/
    public String getSupportedIDFormat() {
        return UUIDEncoded;
    }
    
    /**
     * {@inheritDoc}
     **/
    public net.jxta.id.ID fromURL( URL source ) throws MalformedURLException, UnknownServiceException {
        
        // 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( getSupportedIDFormat() ) ) {
            throw new UnknownServiceException( "JXTA ID Format was not as expected." );
        }
        
        // skip the dash
        encoded = encoded.substring( dashAt + 1 );
        
        // check that the length is even
        if( 0 != (encoded.length() % 2) ) {
            throw new MalformedURLException( "URN contains an odd number of chars" );
        }
        
        // check that the length is long enough
        if( encoded.length() < 2 ) {
            throw new MalformedURLException( "URN does not contain enough chars" );
        }
        
        // check that id is short enough
        if( IDFormat.IdByteArraySize < (encoded.length() % 2) ) {
            throw new MalformedURLException( "URN contains too many chars" );
        }
        
        net.jxta.id.ID result = null;
        IDBytes id = new IDBytes();
        
        try {
            // do the primary portion.
            for( int eachByte = 0; eachByte < ((encoded.length() / 2) - IDFormat.flagsSize ); eachByte++ ) {
                int index = eachByte * 2;
                String twoChars = encoded.substring( index, index + 2 );
                id.bytes[eachByte] = (byte) Integer.parseInt( twoChars, 16 );
            }
            
            // do the flags
            for( int eachByte = IDFormat.flagsOffset; eachByte < IDFormat.IdByteArraySize; eachByte++ ) {
                int index = encoded.length() - (IDFormat.IdByteArraySize - eachByte) * 2;
                String twoChars = encoded.substring( index, index + 2 );
                id.bytes[eachByte] = (byte) Integer.parseInt( twoChars, 16 );
            }
        } catch( NumberFormatException caught ) {
            throw new MalformedURLException( "Invalid Character in JXTA URI" );
        }
        
        switch( id.bytes[IDFormat.flagsOffset + IDFormat.flagsIdTypeOffset] ) {
            case IDFormat.flagCodatID :
                result = new CodatID(id);
                break;
            case IDFormat.flagPeerGroupID :
                result = new PeerGroupID(id);
                result = (PeerGroupID) IDFormat.translateToWellKnown( result );
                break;
            case IDFormat.flagPeerID :
                result = new PeerID(id);
                break;
            case IDFormat.flagPipeID :
                result = new PipeID(id);
                break;
            case IDFormat.flagModuleClassID :
                result = new ModuleClassID(id);
                break;
            case IDFormat.flagModuleSpecID :
                result = new ModuleSpecID(id);
                break;
            default :
                throw new MalformedURLException( "JXTA ID Type not recognized" );
        }
        
        return result;
    }
    
    /**
     * {@inheritDoc}
     **/
    public net.jxta.codat.CodatID newCodatID( net.jxta.peergroup.PeerGroupID groupID ) {
        PeerGroupID  peerGroupID = (PeerGroupID) IDFormat.translateFromWellKnown( groupID );
        
        return new CodatID( peerGroupID );
    }
    
    /**
     * {@inheritDoc}
     **/
    public net.jxta.codat.CodatID newCodatID( net.jxta.peergroup.PeerGroupID groupID, byte [] seed ) {
        PeerGroupID  peerGroupID = (PeerGroupID) IDFormat.translateFromWellKnown( groupID );
        
        return new CodatID( peerGroupID, seed );
    }
    
    /**
     * {@inheritDoc}
     **/
    public net.jxta.codat.CodatID newCodatID( net.jxta.peergroup.PeerGroupID groupID, InputStream in ) throws IOException {