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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2008-2010 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
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 */

package com.sun.enterprise.universal.glassfish;

import com.sun.enterprise.universal.collections.CollectionUtils;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

/**
 * A replacement for System Properties
 * This is designed so that each instance in a shared JVM can have its own
 * System Properties.
 * @author bnevins
 */
public final class GFSystemImpl {
    /**
     * Get the GFSystemImpl Properties
     * @return a snapshot copy of the current Properties
     */
    public final Map getProperties()
    {
        return Collections.unmodifiableMap(props);
    }
    
    /**
     * Get a GF System Property
     * @param key the name of the property
     * @return the value of the property
     */
    public final String getProperty(String key)
    {
        return props.get(key);
    }

    /**
     * Set a GF System Property, null is acceptable for the name and/or value.
     * @param key the name of the property
     * @param value the value of the property
     */
    public final void setProperty(String key, String value)
    {
        props.put(key, value);
    }
    
    public GFSystemImpl() {
    }
    
    // initial props copy java.lang.System Properties
    private final ConcurrentMap props = new ConcurrentHashMap(
            CollectionUtils.propertiesToStringMap(System.getProperties()));
}