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 /**
39 * {@inheritDoc}
40 */
41 @Override
42 public Object getAttribute(Object key) {
43 return getAttributes().get(key);
44 }
45
46 /**
47 * {@inheritDoc}
48 */
49 @Override
50 public State getCurrentState() {
51 return currentState;
52 }
53
54 /**
55 * {@inheritDoc}
56 */
57 @Override
58 public void setAttribute(Object key, Object value) {
59 getAttributes().put(key, value);
60 }
61
62 /**
63 * {@inheritDoc}
64 */
65 @Override
66 public void setCurrentState(State state) {
67 currentState = state;
68 }
69
70 protected Map<Object, Object> getAttributes() {
71 if (attributes == null) {
72 attributes = new HashMap<>();
73 }
74 return attributes;
75 }
76
77 /**
78 * {@inheritDoc}
79 */
80 @Override
81 public String toString() {
82 StringBuilder sb = new StringBuilder();
83
84 sb.append("StateContext[");
85 sb.append("currentState=").append(currentState);
86 sb.append(",attributes=").append(attributes);
87 sb.append("]");
88
89 return sb.toString();
90 }
91 }