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'databene commons' is an open source Java library by Volker Bergmann. It provides extensions to the Java core library by utility classes, abstract concepts and concrete implementations.

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/*
 * Copyright (C) 2004-2014 Volker Bergmann ([email protected]).
 * All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.databene.commons.context;

import org.databene.commons.Context;

import java.util.Hashtable;
import java.util.Map;
import java.util.HashMap;
import java.util.Properties;
import java.util.Set;

/**
 * A thread-safe implementation of Context.

 * 

 * Created: 06.07.2007 06:30:43
 * @author Volker Bergmann
 */
public class DefaultContext implements Context {

    private Context defaults;

    protected Map map;

    public DefaultContext() {
        this((Context) null);
    }

    public DefaultContext(Context defaults) {
        this.defaults = defaults;
        this.map = new HashMap();
    }

    public DefaultContext(Map map) {
    	this.defaults = null;
        this.map = new HashMap(map);
    }
    
    public DefaultContext(Properties props) {
    	this.defaults = null;
        this.map = new HashMap(props.size());
        for (Map.Entry entry : props.entrySet())
        	this.map.put((String) entry.getKey(), entry.getValue());
    }
    
    @Override
	public synchronized Object get(String key) {
        Object value = map.get(key);
        if (value == null && defaults != null)
            value = defaults.get(key);
        return value;
    }

    @Override
	public boolean contains(String key) {
        if (map.containsKey(key))
        	return true;
        return (defaults != null && defaults.contains(key));
    }

    @Override
	public synchronized void set(String key, Object value) {
        map.put(key, value);
    }
    
    @Override
	public synchronized Set> entrySet() {
        return map.entrySet();
    }

    public synchronized  void setAll(Hashtable map) {
        for (Map.Entry entry : map.entrySet())
            this.set(String.valueOf(entry.getKey()), entry.getValue());
    }

    public synchronized  void setAll(Map map) {
        for (Map.Entry entry : map.entrySet())
            this.set(String.valueOf(entry.getKey()), entry.getValue());
    }

    @Override
	public void remove(String key) {
		map.remove(key);
	}
	
    @Override
	public Set keySet() {
        return map.keySet();
    }

    @Override
	public synchronized String toString() {
        return map.toString();
    }

}