View Javadoc
1   /*
2    *  Licensed to the Apache Software Foundation (ASF) under one
3    *  or more contributor license agreements.  See the NOTICE file
4    *  distributed with this work for additional information
5    *  regarding copyright ownership.  The ASF licenses this file
6    *  to you under the Apache License, Version 2.0 (the
7    *  "License"); you may not use this file except in compliance
8    *  with the License.  You may obtain a copy of the License at
9    *
10   *    http://www.apache.org/licenses/LICENSE-2.0
11   *
12   *  Unless required by applicable law or agreed to in writing,
13   *  software distributed under the License is distributed on an
14   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   *  KIND, either express or implied.  See the License for the
16   *  specific language governing permissions and limitations
17   *  under the License.
18   *
19   */
20  package org.apache.mina.statemachine.context;
21  
22  import java.util.HashMap;
23  import java.util.Map;
24  
25  import org.apache.commons.lang.builder.ToStringBuilder;
26  import org.apache.mina.statemachine.State;
27  
28  /**
29   * Abstract {@link StateContext} which uses a {@link Map} to store the
30   * attributes.
31   *
32   * @author <a href="http://mina.apache.org">Apache MINA Project</a>
33   */
34  public abstract class AbstractStateContext implements StateContext {
35      private State currentState = null;
36  
37      private Map<Object, Object> attributes = null;
38  
39      public Object getAttribute(Object key) {
40          return getAttributes().get(key);
41      }
42  
43      public State getCurrentState() {
44          return currentState;
45      }
46  
47      public void setAttribute(Object key, Object value) {
48          getAttributes().put(key, value);
49      }
50  
51      public void setCurrentState(State state) {
52          currentState = state;
53      }
54  
55      protected Map<Object, Object> getAttributes() {
56          if (attributes == null) {
57              attributes = new HashMap<Object, Object>();
58          }
59          return attributes;
60      }
61  
62      public String toString() {
63          return new ToStringBuilder(this).append("currentState", currentState).append("attributes", attributes)
64                  .toString();
65      }
66  }