001/*
002 *  Licensed to the Apache Software Foundation (ASF) under one
003 *  or more contributor license agreements.  See the NOTICE file
004 *  distributed with this work for additional information
005 *  regarding copyright ownership.  The ASF licenses this file
006 *  to you under the Apache License, Version 2.0 (the
007 *  "License"); you may not use this file except in compliance
008 *  with the License.  You may obtain a copy of the License at
009 *
010 *    http://www.apache.org/licenses/LICENSE-2.0
011 *
012 *  Unless required by applicable law or agreed to in writing,
013 *  software distributed under the License is distributed on an
014 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 *  KIND, either express or implied.  See the License for the
016 *  specific language governing permissions and limitations
017 *  under the License.
018 *
019 */
020package org.apache.mina.statemachine.context;
021
022import java.util.HashMap;
023import java.util.Map;
024
025import org.apache.mina.statemachine.State;
026
027/**
028 * Abstract {@link StateContext} which uses a {@link Map} to store the
029 * attributes.
030 *
031 * @author <a href="http://mina.apache.org">Apache MINA Project</a>
032 */
033public abstract class AbstractStateContext implements StateContext {
034    private State currentState = null;
035
036    private Map<Object, Object> attributes = null;
037
038    public Object getAttribute(Object key) {
039        return getAttributes().get(key);
040    }
041
042    public State getCurrentState() {
043        return currentState;
044    }
045
046    public void setAttribute(Object key, Object value) {
047        getAttributes().put(key, value);
048    }
049
050    public void setCurrentState(State state) {
051        currentState = state;
052    }
053
054    protected Map<Object, Object> getAttributes() {
055        if (attributes == null) {
056            attributes = new HashMap<Object, Object>();
057        }
058        return attributes;
059    }
060
061    public String toString() {
062        StringBuilder sb = new StringBuilder();
063        
064        sb.append("StateContext[");
065        sb.append("currentState=").append(currentState);
066        sb.append(",attributes=").append(attributes);
067        sb.append("]");
068        
069        return sb.toString();
070    }
071}