01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one
03: * or more contributor license agreements. See the NOTICE file
04: * distributed with this work for additional information
05: * regarding copyright ownership. The ASF licenses this file
06: * to you under the Apache License, Version 2.0 (the
07: * "License"); you may not use this file except in compliance
08: * with the License. You may obtain a copy of the License at
09: *
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: /**
23: * {@link StateContextLookup} implementation which always returns the same
24: * {@link StateContext} instance.
25: *
26: * @author The Apache MINA Project (dev@mina.apache.org)
27: * @version $Rev: 586695 $, $Date: 2007-10-20 04:01:17 -0600 (Sat, 20 Oct 2007) $
28: */
29: public class SingletonStateContextLookup implements StateContextLookup {
30: private final StateContext context;
31:
32: /**
33: * Creates a new instance which always returns the same
34: * {@link DefaultStateContext} instance.
35: */
36: public SingletonStateContextLookup() {
37: context = new DefaultStateContext();
38: }
39:
40: /**
41: * Creates a new instance which uses the specified {@link StateContextFactory}
42: * to create the single instance.
43: *
44: * @param contextFactory the {@link StateContextFactory} to use to create
45: * the singleton instance.
46: */
47: public SingletonStateContextLookup(
48: StateContextFactory contextFactory) {
49: if (contextFactory == null) {
50: throw new NullPointerException("contextFactory");
51: }
52: context = contextFactory.create();
53: }
54:
55: public StateContext lookup(Object[] eventArgs) {
56: return context;
57: }
58: }
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