1 package org.codehaus.plexus.component.configurator.expression;
2
3 /*
4 * Copyright 2001-2006 Codehaus Foundation.
5 *
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18
19 import java.io.File;
20
21 /**
22 * Evaluate an expression.
23 *
24 * @author <a href="mailto:brett@codehaus.org">Brett Porter</a>
25 */
26 public interface ExpressionEvaluator {
27 String ROLE = ExpressionEvaluator.class.getName();
28
29 /**
30 * Evaluate an expression.
31 *
32 * @param expression the expression
33 * @return the value of the expression
34 * @throws ExpressionEvaluationException in case of an error.
35 */
36 Object evaluate(String expression) throws ExpressionEvaluationException;
37
38 /**
39 * Align a given path to the base directory that can be evaluated by this expression evaluator, if known.
40 *
41 * @param file the file
42 * @return the aligned file
43 */
44 File alignToBaseDirectory(File file);
45 }