01: /*
02: * Copyright 2002,2004 The Apache Software Foundation.
03: *
04: * Licensed under the Apache License, Version 2.0 (the "License");
05: * you may not use this file except in compliance with the License.
06: * You may obtain a copy of the License at
07: *
08: * http://www.apache.org/licenses/LICENSE-2.0
09: *
10: * Unless required by applicable law or agreed to in writing, software
11: * distributed under the License is distributed on an "AS IS" BASIS,
12: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13: * See the License for the specific language governing permissions and
14: * limitations under the License.
15: */
16:
17: package org.apache.commons.jexl.util.introspection;
18:
19: /**
20: * Interface defining a 'getter'. For uses when looking for resolution of
21: * property references
22: *
23: * $foo.bar
24: *
25: * @since 1.0
26: * @author <a href="mailto:geirm@optonline.net">Geir Magnusson Jr.</a>
27: * @version $Id: VelPropertyGet.java 398514 2006-05-01 03:44:34Z dion $
28: */
29: public interface VelPropertyGet {
30: /**
31: * invocation method - called when the 'get action' should be performed and
32: * a value returned.
33: * @param o the object to get the property from.
34: * @return the property value.
35: * @throws Exception on any error.
36: */
37: Object invoke(Object o) throws Exception;
38:
39: /**
40: * specifies if this VelPropertyGet is cacheable and able to be reused for
41: * this class of object it was returned for.
42: *
43: * @return true if can be reused for this class, false if not
44: */
45: boolean isCacheable();
46:
47: /**
48: * returns the method name used to return this 'property'.
49: * @return the method name.
50: */
51: String getMethodName();
52: }
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