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Apache Stratos CLI
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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.stratos.cli;

import java.util.HashMap;
import java.util.Map;
import java.util.Observable;

public class CommandContext extends Observable {

    /**
     * Properties for the context.
     */
    private Map properties;

    /**
     * The application
     */
    private final CommandLineApplication application;

    public CommandContext(CommandLineApplication application) {
        properties = new HashMap();
        this.application = application;
    }

    public final CommandLineApplication getApplication() {
        return application;
    }

    /**
     * Set property in the context
     *
     * @param key The key
     * @param o   The value for the key
     * @return The previous value or null
     */
    public Object put(String key, Object o) {
        Object previous = properties.put(key, o);
        setChanged();
        notifyObservers();
        return previous;
    }

    /**
     * Get property value from the context
     *
     * @param key The key
     * @return The value
     */
    public Object getObject(String key) {
        return properties.get(key);
    }

    /**
     * Get the string value, or null
     *
     * @param key The key
     * @return The string value, or null.
     */
    public String getString(String key) {
        Object o = getObject(key);
        if (o instanceof String) {
            return (String) o;
        }
        return null;
    }

}