randomaccessfilestoragefactory.java

Java的面向对象数据库系统的源代码

// You can redistribute this software and/or modify it under the terms of
// the Ozone Core License version 1 published by ozone-db.org.
//
// Copyright (C) 2003-@year@, Leo Mekenkamp. All rights reserved.
//
// $Id: RandomAccessFileStorageFactory.java,v 1.1 2004/01/02 09:24:38 leomekenkamp Exp $

package org.ozoneDB.core.storage.gammaStore;

import java.io.File;
import java.io.IOException;
import java.util.Collection;
import java.util.List;
import java.util.Properties;
import java.util.logging.Logger;
import org.ozoneDB.core.storage.PropertyInfo;

/**
 * @author <a href="mailto:leoATmekenkampD0Tcom">Leo Mekenkamp (mind the anti sp@m)</a>
 * @version $Id: RandomAccessFileStorageFactory.java,v 1.1 2004/01/02 09:24:38 leomekenkamp Exp $
 */
public class RandomAccessFileStorageFactory extends FileStorageFactory {
    
    private static Logger log = Logger.getLogger(RandomAccessFileStorageFactory.class.getName());
    
    public static final PropertyInfo MODE = new PropertyInfo(
        ".mode",
        "one of r, rw, rws, rwd",
        "rws",
        "mode for opening the storage files; see mode in java.util.RandomAccessFile#RandomAccessFile(java.io.File, String)",
        new String[] {
            "rw", "rwd"
        }
    );

    private String mode;
    
    /**
     * As prescribed by the <code>PropertyConfigurable</code> interface.
     */
    public RandomAccessFileStorageFactory(Properties properties, String prefix) {
        super(properties, prefix);
        String property = getPrefix() + MODE.getKey();
        setMode(properties.getProperty(property, MODE.getDefaultValue()));
    }
    
    public Storage createStorage(String name) throws IOException {
        File file = nameToFile(name);
        ensureParentsExist(file);
        return new RandomAccessFileStorage(file, getMode());
    }
    
    // private so it can be inlined
    private String getMode() {
        return mode;
    }
    
    // private so it can be inlined
    private void setMode(String mode) {
        this.mode = mode;
    }
    
    public Collection getPropertyInfos() {
        Collection result = super.getPropertyInfos();
        result.add(MODE);
        return result;
    }
    
}