instantiator.java

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

/************************************************************************
 *
 * $Id: Instantiator.java,v 1.9 2004/04/24 18:47:26 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.id.jxta;

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 java.security.ProviderException;

import net.jxta.codat.CodatID;
import net.jxta.id.ID;
import net.jxta.peer.PeerID;
import net.jxta.peergroup.PeerGroupID;
import net.jxta.pipe.PipeID;
import net.jxta.platform.ModuleClassID;
import net.jxta.platform.ModuleSpecID;

/**
 * Instantiator for the 'jxta' ID Format.
 *
 * @see net.jxta.id.ID
 * @see net.jxta.id.IDFactory
 * @see net.jxta.id.jxta.IDFormat
 **/
final class Instantiator implements net.jxta.id.IDFactory.URIInstantiator {
    
    /**
     *  This table maps the textual values of the well known ids to the
     *  singleton classes which match those textual names.
     **/
    final static Object[] [] wellKnownIDs = {
        { net.jxta.id.ID.nullID.getUniqueValue(),
          net.jxta.id.ID.nullID },
          
          { net.jxta.peergroup.PeerGroupID.worldPeerGroupID.getUniqueValue(),
            net.jxta.peergroup.PeerGroupID.worldPeerGroupID },
            
            { net.jxta.peergroup.PeerGroupID.defaultNetPeerGroupID.getUniqueValue(),
              net.jxta.peergroup.PeerGroupID.defaultNetPeerGroupID }
    };
    
    /**
     * {@inheritDoc}
     **/
    public String getSupportedIDFormat() {
        return IDFormat.JXTAFormat;
    }
    
    /**
     * {@inheritDoc}
     **/
    public ID fromURL( URL source ) throws MalformedURLException, UnknownServiceException {
        
        // check the protocol
        if ( !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 ( !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( "JXTA ID Format was missing." );
        
        if( !encoded.substring( 0, dashAt).equals( getSupportedIDFormat() ) )
            throw new UnknownServiceException( "JXTA ID Format was not as expected." );
        
        for( int eachWellKnown = 0; eachWellKnown < wellKnownIDs.length; eachWellKnown++ ) {
            if( encoded.equalsIgnoreCase( wellKnownIDs[eachWellKnown][0].toString() ) )
                return (ID) wellKnownIDs[eachWellKnown][1];
        }
        
        throw new MalformedURLException( "unrecognized id" );
    }
    
    /**
     * {@inheritDoc}
     **/
    public CodatID newCodatID(PeerGroupID groupID) {
        throw new ProviderException( "unsupported id type" );
    }
    
    /**
     * {@inheritDoc}
     **/
    public CodatID newCodatID(PeerGroupID groupID, byte [] seed ) {
        throw new ProviderException( "unsupported id type" );
    }
    
    /**
     * {@inheritDoc}
     **/
    public CodatID newCodatID(PeerGroupID groupID, InputStream in ) throws IOException {
        throw new ProviderException( "unsupported id type" );
    }
    
    /**
     * {@inheritDoc}
     **/
    public CodatID newCodatID(PeerGroupID groupID, byte [] seed, InputStream in ) throws IOException {
        throw new ProviderException( "unsupported id type" );
    }
    
    /**
     * {@inheritDoc}
     **/
    public PeerID newPeerID(PeerGroupID groupID) {
        throw new ProviderException( "unsupported id type" );
    }
    
    /**
     * {@inheritDoc}
     **/
    public PeerID newPeerID(PeerGroupID groupID, byte [] seed ) {
        throw new ProviderException( "unsupported id type" );
    }
    
    /**
     * {@inheritDoc}
     **/
    public net.jxta.peergroup.PeerGroupID newPeerGroupID( ) {
        throw new ProviderException( "unsupported id type" );
    }
    
    /**
     * {@inheritDoc}
     **/
    public net.jxta.peergroup.PeerGroupID newPeerGroupID( byte[] seed ) {
        throw new ProviderException( "unsupported id type" );
    }
    
    /**
     * {@inheritDoc}
     **/
    public net.jxta.peergroup.PeerGroupID newPeerGroupID( net.jxta.peergroup.PeerGroupID parent) {
        throw new ProviderException( "unsupported id type" );
    }
    
    /**
     * {@inheritDoc}
     **/
    public net.jxta.peergroup.PeerGroupID newPeerGroupID( net.jxta.peergroup.PeerGroupID parent, byte[] seed ) {
        throw new ProviderException( "unsupported id type" );
    }
    
    /**
     * {@inheritDoc}
     **/
    public PipeID newPipeID( PeerGroupID groupID ) {
        throw new ProviderException( "unsupported id type" );
    }
    
    /**
     * {@inheritDoc}
     **/
    public PipeID newPipeID( PeerGroupID groupID, byte[] seed ) {
        throw new ProviderException( "unsupported id type" );
    }
    
    /**
     * {@inheritDoc}
     **/
    public ModuleClassID newModuleClassID() {
        throw new ProviderException( "unsupported id type" );
    }
    
    /**
     * {@inheritDoc}
     **/
    public ModuleClassID newModuleClassID( ModuleClassID classID ) {
        throw new ProviderException( "unsupported id type" );
    }
    
    /**
     * {@inheritDoc}
     **/
    public ModuleSpecID newModuleSpecID( ModuleClassID classID ) {
        throw new ProviderException( "unsupported id type" );
    }
    
    /**
     * {@inheritDoc}
     **/
    public ID fromURI( URI source ) throws URISyntaxException {
        
        // check the protocol
        if ( !ID.URIEncodingName.equalsIgnoreCase(source.getScheme()) )
            throw new URISyntaxException( source.toString(), "URI scheme was not as expected." );
        
        String decoded = source.getSchemeSpecificPart();
        
        int colonAt = decoded.indexOf( ':' );
        
        // There's a colon right?
        if( -1 == colonAt )
            throw new URISyntaxException( source.toString(), "URN namespace was missing." );
        
        // check the namespace
        if ( !net.jxta.id.ID.URNNamespace.equalsIgnoreCase(decoded.substring( 0, colonAt )) )
            throw new URISyntaxException( source.toString(), "URN namespace was not as expected. (" +
            net.jxta.id.ID.URNNamespace + "!=" + decoded.substring( 0, colonAt ) + ")" );
        
        // skip the namespace portion and the colon
        decoded = decoded.substring( colonAt + 1 );
        
        return fromURNNamespaceSpecificPart( decoded );
    }
    
    /**
     * {@inheritDoc}
     **/
    public ID fromURNNamespaceSpecificPart( String source ) throws URISyntaxException {
        int dashAt = source.indexOf( '-' );
        
        // there's a dash, right?
        if( -1 == dashAt )
            throw new URISyntaxException( source.toString(), "URN jxta namespace IDFormat was missing." );
        
        if( !source.substring( 0, dashAt).equals( getSupportedIDFormat() ) )
            throw new URISyntaxException( source, "JXTA ID Format was not as expected." );
        
        for( int eachWellKnown = 0; eachWellKnown < wellKnownIDs.length; eachWellKnown++ ) {
            if( source.equalsIgnoreCase( wellKnownIDs[eachWellKnown][0].toString() ) )
                return (ID) wellKnownIDs[eachWellKnown][1];
        }
        
        throw new URISyntaxException( source, "unrecognized id" );
    }
}