01: // Copyright 2004, 2005 The Apache Software Foundation
02: //
03: // Licensed under the Apache License, Version 2.0 (the "License");
04: // you may not use this file except in compliance with the License.
05: // You may obtain a copy of the License at
06: //
07: // http://www.apache.org/licenses/LICENSE-2.0
08: //
09: // 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: * Returns true if the given system property is set.
27: */
28:
29: public boolean isPropertySet(String propertyName);
30:
31: /**
32: * Returns true if the class, specified by FQCN, exists.
33: *
34: */
35:
36: public boolean doesClassExist(String className);
37: }
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