abstractstatecontext.java

mina是以Java实现的一个开源的网络程序框架

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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.mina.statemachine.context;

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

import org.apache.commons.lang.builder.ToStringBuilder;
import org.apache.mina.statemachine.State;

/**
 * Abstract {@link StateContext} which uses a {@link Map} to store the
 * attributes.
 *
 * @author The Apache MINA Project ([e-mail])
 * @version $Rev: 586695 $, $Date: 2007-10-20 12:01:17 +0200 (Sat, 20 Oct 2007) $
 */
public abstract class AbstractStateContext implements StateContext {
    private State currentState = null;
    private Map<Object, Object> attributes = null;

    public Object getAttribute(Object key) {
        return getAttributes().get(key);
    }

    public State getCurrentState() {
        return currentState;
    }

    public void setAttribute(Object key, Object value) {
        getAttributes().put(key, value);
    }

    public void setCurrentState(State state) {
        currentState = state;
    }

    protected Map<Object, Object> getAttributes() {
        if (attributes == null) {
            attributes = new HashMap<Object, Object>();
        }
        return attributes;
    }

    public String toString() {
        return new ToStringBuilder(this)
            .append("currentState", currentState)
            .append("attributes", attributes)
            .toString();
    }    
}