psekeystoremanagerfactory.java

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

/************************************************************************
 *
 * $Id: PSEKeyStoreManagerFactory.java,v 1.3 2006/03/06 19:43:09 bondolo Exp $
 *
 * Copyright (c) 2001 Sun Microsystems, Inc.  All rights reserved.
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 *       "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.
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package net.jxta.impl.membership.pse;

import java.util.NoSuchElementException;
import java.net.URI;
import java.io.File;

import java.security.KeyStoreException;
import java.security.NoSuchProviderException;

import net.jxta.peergroup.PeerGroup;
import net.jxta.document.Advertisement;
import net.jxta.id.ID;
import net.jxta.document.Element;
import net.jxta.protocol.ConfigParams;
import net.jxta.exception.PeerGroupException;
import net.jxta.document.AdvertisementFactory;
import net.jxta.document.XMLElement;

import net.jxta.impl.cm.Cm;
import net.jxta.impl.peergroup.StdPeerGroup;
import net.jxta.impl.protocol.PSEConfigAdv;

/**
 *  Encapsulates the behaviour for creating KeyStoreManager Objects.
 **/
public abstract class PSEKeyStoreManagerFactory {
    
    /**
    *   The default KeyStoreManagerGenerator
    **/
    private static PSEKeyStoreManagerFactory defaultGenerator = null;
    
    /**
    *   Sets the default KeyStoreManagerGenerator. 
    *
    *   @param newDefault The new default KeyStoreManagerGenerator.
    **/
    public static void setDefault(PSEKeyStoreManagerFactory newDefault ) {
        synchronized( PSEKeyStoreManagerFactory.class ) {
            defaultGenerator = newDefault;
            }
    }
    
    /**
    *   Returns the default KeyStoreManagerGenerator.
    *
    *   @return The current default KeyStoreManagerGenerator.
    **/
    public static PSEKeyStoreManagerFactory getDefault() {
        synchronized( PSEKeyStoreManagerFactory.class ) {
            if (defaultGenerator == null) {
                defaultGenerator = new PSEKeyStoreManagerFactoryDefault();
            }
            
            return defaultGenerator;
        }
    }
    
    /**
    *   Creates a new KeyStoreManager instance based upon the context and configuration.
    *
    *   @param service  The service that this keystore manager will be working for.
    *   @param config   The configuration parameters.
    **/
    public abstract KeyStoreManager getInstance(PSEMembershipService service, PSEConfigAdv config) throws PeerGroupException;

    
    /**
    *   Provides the default behaviour for generating KeyStore managers for PSE Membership Service Instances.    
    **/
    private static class PSEKeyStoreManagerFactoryDefault extends PSEKeyStoreManagerFactory {

        /**
        *   {@inheritDoc}
        *   
        *   <p/>If no location is specified then use the CMKeyStoreManager otherwise use the URIKeyStoreManager.
        **/
        public KeyStoreManager getInstance(PSEMembershipService service, PSEConfigAdv config) throws PeerGroupException {

            URI location = config.getKeyStoreLocation();
            KeyStoreManager store_manager;
            try {
                if( null == location ) {
                    store_manager = new CMKeyStoreManager(config.getKeyStoreType(), config.getKeyStoreProvider(), service.getGroup(), service.getAssignedID());
                } else {
                    if( !location.isAbsolute() ) {                        
                        // Resolve the location of the keystore relative to our prefs location.
                        location = service.group.getStoreHome().resolve( location );
                    }

                    store_manager = new URIKeyStoreManager(config.getKeyStoreType(), config.getKeyStoreProvider(), location);
                }
                
                return store_manager;                
            } catch( NoSuchProviderException not_available ) {
                throw new PeerGroupException( "Requested KeyStore provider not available", not_available );
            } catch( KeyStoreException bad ) {
                throw new PeerGroupException( "KeyStore failure initializing KeyStoreManager", bad );
            }
        }
    }  
}