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


1 // Copyright 2004, 2005 The Apache Software Foundation
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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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 JavaDoc propertyName);
31     
32     /**
33      * Returns true if the class, specified by FQCN, exists.
34      *
35      */

36     
37     public boolean doesClassExist(String JavaDoc className);
38 }
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