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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.mina.statemachine.State;
26  
27  /**
28   * Abstract {@link StateContext} which uses a {@link Map} to store the
29   * attributes.
30   *
31   * @author <a href="http://mina.apache.org">Apache MINA Project</a>
32   */
33  public abstract class AbstractStateContext implements StateContext {
34      private State currentState = null;
35  
36      private Map<Object, Object> attributes = null;
37  
38      public Object getAttribute(Object key) {
39          return getAttributes().get(key);
40      }
41  
42      public State getCurrentState() {
43          return currentState;
44      }
45  
46      public void setAttribute(Object key, Object value) {
47          getAttributes().put(key, value);
48      }
49  
50      public void setCurrentState(State state) {
51          currentState = state;
52      }
53  
54      protected Map<Object, Object> getAttributes() {
55          if (attributes == null) {
56              attributes = new HashMap<Object, Object>();
57          }
58          return attributes;
59      }
60  
61      public String toString() {
62          StringBuilder sb = new StringBuilder();
63          
64          sb.append("StateContext[");
65          sb.append("currentState=").append(currentState);
66          sb.append(",attributes=").append(attributes);
67          sb.append("]");
68          
69          return sb.toString();
70      }
71  }