basepropertiesimpl.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 Library License version 1 published by ozone-db.org.
//
// This file is
// Copyright (C) 2002-@year@ by Leo Mekenkamp. All rights reserved.
// $Id: BasePropertiesImpl.java,v 1.2 2003/11/20 23:18:41 per_nyfelt Exp $

package org.ozoneDB.collections;

import java.util.Enumeration;
import java.util.Iterator;
import java.util.Map;
import java.util.Properties;
import org.ozoneDB.OzoneObject;

/**
 * See the overall description on {@link org.ozoneDB.collections.OzoneCollection}.
 * <br/>Although properties are technically not a <code>Collection</code>,
 * there are enough similarities to justify placing one in this package.
 *
 * @author <a href="mailto:ozone-db.orgATmekenkampD0Tcom">Leo Mekenkamp (mind the anti-sp@m)</a>
 */
public class BasePropertiesImpl extends OzoneObject implements OzoneProperties {

    private static final long serialVersionUID = 1L;

    protected OzoneTreeMap backingMap;

    protected BasePropertiesImpl() {
    }

    public void load(Properties properties) {
        for(Iterator i = properties.keySet().iterator(); i.hasNext(); ) {
            String key = (String) i.next();
            setProperty(key, properties.getProperty(key));
        }
    }

    public String getProperty(String key) {
        return (String) backingMap.get(key);
    }

    public String getProperty(String key, String defaultValue) {
        String result = getProperty(key);
        return result == null ? defaultValue : result;
    }

    public Enumeration propertyNames() {
        return new IteratorEnumerationAdaptor(backingMap.keySet().iterator());
    }

    public String setProperty(String key, String value) {
        return (String) backingMap.put(key, value);
    }

    public Properties getClientProperties() {
        Properties result = new Properties();
        for(Iterator i = backingMap.entrySet().iterator(); i.hasNext(); ) {
            Map.Entry entry = (Map.Entry) i.next();
            result.setProperty((String) entry.getKey(), (String) entry.getValue());
        }
        return result;
    }

}