old_trunk/apacheds-jdbm/src/main/java/jdbm/recman/Provider.java

/**
 * JDBM LICENSE v1.00
 *
 * Redistribution and use of this software and associated documentation
 * ("Software"), with or without modification, are permitted provided
 * that the following conditions are met:
 *
 * 1. Redistributions of source code must retain copyright
 *    statements and notices.  Redistributions must also contain a
 *    copy of this document.
 *
 * 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 name "JDBM" must not be used to endorse or promote
 *    products derived from this Software without prior written
 *    permission of Cees de Groot.  For written permission,
 *    please contact cg@cdegroot.com.
 *
 * 4. Products derived from this Software may not be called "JDBM"
 *    nor may "JDBM" appear in their names without prior written
 *    permission of Cees de Groot.
 *
 * 5. Due credit should be given to the JDBM Project
 *    (http://jdbm.sourceforge.net/).
 *
 * THIS SOFTWARE IS PROVIDED BY THE JDBM PROJECT AND CONTRIBUTORS
 * ``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
 * CEES DE GROOT OR ANY 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.
 *
 * Copyright 2000 (C) Cees de Groot. All Rights Reserved.
 * Copyright 2000-2001 (C) Alex Boisvert. All Rights Reserved.
 * Contributions are Copyright (C) 2000 by their associated contributors.
 *
 * $Id: Provider.java,v 1.3 2005/06/25 23:12:32 doomdark Exp $
 */

package jdbm.recman;

import java.io.IOException;
import java.util.Properties;

import jdbm.RecordManager;
import jdbm.RecordManagerOptions;
import jdbm.RecordManagerProvider;

import jdbm.helper.MRU;

/**
 * Provider of the default RecordManager implementation.
 *
 * @author <a href="mailto:boisvert@intalio.com">Alex Boisvert</a>
 * @version $Id: Provider.java,v 1.3 2005/06/25 23:12:32 doomdark Exp $
 */
public final class Provider
    implements RecordManagerProvider
{

    /**
     * Create a default implementation record manager.
     *
     * @param name Name of the record file.
     * @param options Record manager options.
     * @throws IOException if an I/O related exception occurs while creating
     *                    or opening the record manager.
     * @throws UnsupportedOperationException if some options are not supported by the
     *                                      implementation.
     * @throws IllegalArgumentException if some options are invalid.
     */
    public RecordManager createRecordManager( String name,
                                              Properties options )
        throws IOException
    {
        RecordManager  recman;
        String         value;
        int            cacheSize;

        recman = new BaseRecordManager( name );

        value = options.getProperty( RecordManagerOptions.DISABLE_TRANSACTIONS, "false" );
        if ( value.equalsIgnoreCase( "TRUE" ) ) {
            ( (BaseRecordManager) recman ).disableTransactions();
        }

        value = options.getProperty( RecordManagerOptions.CACHE_SIZE, "1000" );
        cacheSize = Integer.parseInt( value );

        value = options.getProperty( RecordManagerOptions.CACHE_TYPE,
                                     RecordManagerOptions.NORMAL_CACHE );
        if ( value.equalsIgnoreCase( RecordManagerOptions.NORMAL_CACHE ) ) {
            MRU cache = new MRU( cacheSize );
            recman = new CacheRecordManager( recman, cache );
        } else if ( value.equalsIgnoreCase( RecordManagerOptions.SOFT_REF_CACHE ) ) {
            throw new IllegalArgumentException( "Soft reference cache not implemented" );
        } else if ( value.equalsIgnoreCase( RecordManagerOptions.WEAK_REF_CACHE ) ) {
            throw new IllegalArgumentException( "Weak reference cache not implemented" );
        } else {
            throw new IllegalArgumentException( "Invalid cache type: " + value );
        }

        return recman;
    }


}