EvaluationContext


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  /**
18   * Provides context when evaluating an AST of {@link org.apache.hivemind.conditional.Node}s.
19   * Effectively, a wrapper around certain runtime operations.
20   * 
21   * @author Howard M. Lewis Ship
22   * @since 1.1
23   */
24  public interface EvaluationContext
25  {
26      /**
27       * Returns true if the given system property is set.
28       */
29  
30      public boolean isPropertySet(String   propertyName);
31      
32      /**
33       * Returns true if the class, specified by FQCN, exists.
34       * 
35       */
36      
37      public boolean doesClassExist(String   className);
38  }

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