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17 package org.apache.commons.jexl.util.introspection;
18
19 /***
20 * Interface used for setting values that appear to be properties in Velocity.
21 * Ex.
22 *
23 * #set($foo.bar = "hello")
24 *
25 * @since 1.0
26 * @author <a href="mailto:geirm@optonline.net">Geir Magnusson Jr.</a>
27 * @version $Id: VelPropertySet.java 398515 2006-05-01 03:46:33Z dion $
28 */
29 public interface VelPropertySet {
30 /***
31 * method used to set the value in the object.
32 *
33 * @param o Object on which the method will be called with the arg
34 * @param arg value to be set
35 * @return the value returned from the set operation (impl specific)
36 * @throws Exception on any error.
37 */
38 Object invoke(Object o, Object arg) throws Exception;
39
40 /***
41 * specifies if this VelPropertySet is cacheable and able to be reused for
42 * this class of object it was returned for.
43 *
44 * @return true if can be reused for this class, false if not
45 */
46 boolean isCacheable();
47
48 /***
49 * returns the method name used to set this 'property'.
50 * @return the method name.
51 */
52 String getMethodName();
53 }