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Source file | Conditionals | Statements | Methods | TOTAL | |||||||||||||||
ExpressionCacheImpl.java | 100% | 100% | 100% | 100% |
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1 | // Copyright 2004, 2005 The Apache Software Foundation | |
2 | // | |
3 | // Licensed under the Apache License, Version 2.0 (the "License"); | |
4 | // you may not use this file except in compliance with the License. | |
5 | // You may obtain a copy of the License at | |
6 | // | |
7 | // http://www.apache.org/licenses/LICENSE-2.0 | |
8 | // | |
9 | // Unless required by applicable law or agreed to in writing, software | |
10 | // distributed under the License is distributed on an "AS IS" BASIS, | |
11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
12 | // See the License for the specific language governing permissions and | |
13 | // limitations under the License. | |
14 | ||
15 | package org.apache.tapestry.services.impl; | |
16 | ||
17 | import java.util.HashMap; | |
18 | import java.util.Map; | |
19 | ||
20 | import ognl.Ognl; | |
21 | ||
22 | import org.apache.hivemind.ApplicationRuntimeException; | |
23 | import org.apache.tapestry.event.ResetEventListener; | |
24 | import org.apache.tapestry.services.ExpressionCache; | |
25 | ||
26 | /** | |
27 | * @author Howard M. Lewis Ship | |
28 | * @since 4.0 | |
29 | */ | |
30 | public class ExpressionCacheImpl implements ExpressionCache, ResetEventListener | |
31 | { | |
32 | 1 | public synchronized void resetEventDidOccur() |
33 | { | |
34 | 1 | _cache.clear(); |
35 | } | |
36 | ||
37 | private Map _cache = new HashMap(); | |
38 | ||
39 | 1810 | public synchronized Object getCompiledExpression(String expression) |
40 | { | |
41 | 1810 | Object result = _cache.get(expression); |
42 | ||
43 | 1810 | if (result == null) |
44 | { | |
45 | 551 | result = parse(expression); |
46 | 550 | _cache.put(expression, result); |
47 | } | |
48 | ||
49 | 1809 | return result; |
50 | } | |
51 | ||
52 | 551 | private Object parse(String expression) |
53 | { | |
54 | 551 | try |
55 | { | |
56 | 551 | return Ognl.parseExpression(expression); |
57 | } | |
58 | catch (Exception ex) | |
59 | { | |
60 | 1 | throw new ApplicationRuntimeException(ImplMessages.unableToParseExpression( |
61 | expression, | |
62 | ex), ex); | |
63 | } | |
64 | } | |
65 | ||
66 | } |
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