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Java > Open Source Codes > org > apache > hivemind > conditional > EvaluationContextImpl


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.hivemind.conditional;
16
17 import org.apache.hivemind.ApplicationRuntimeException;
18 import org.apache.hivemind.ClassResolver;
19 import org.apache.hivemind.util.Defense;
20
21 /**
22  * @author Howard M. Lewis Ship
23  */
24 public class EvaluationContextImpl implements EvaluationContext
25 {
26     private ClassResolver _resolver;
27
28     public EvaluationContextImpl(ClassResolver resolver)
29     {
30         Defense.notNull(resolver, "resolver");
31
32         _resolver = resolver;
33     }
34
35     public boolean isPropertySet(String JavaDoc propertyName)
36     {
37         return Boolean.getBoolean(propertyName);
38     }
39
40     public boolean doesClassExist(String JavaDoc className)
41     {
42         try
43         {
44             _resolver.findClass(className);
45
46             return true;
47         }
48         catch (ApplicationRuntimeException ex)
49         {
50             return false;
51         }
52     }
53
54 }
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