1 /*
2 * Copyright 2004-2009 the original author or authors.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
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.springmodules.validation.util.fel;
18
19 /**
20 * Represents a single argument function. The function evaluates the argument and outputs
21 * the evaluation result.
22 *
23 * @author Uri Boness
24 */
25 public interface Function {
26
27 /**
28 * Evaluate the function on the given argument and return the evaluation result.
29 *
30 * @param argument The argument to the function.
31 * @return The evaluation result
32 * @throws FelEvaluationException thrown when the evaluation fails.
33 */
34 Object evaluate(Object argument) throws FelEvaluationException;
35
36 }