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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  /**
20   * Evaluate an expression.
21   *
22   * @author <a href="mailto:brett@codehaus.org">Brett Porter</a>
23   * @version $Id$
24   */
25  public interface TypeAwareExpressionEvaluator
26      extends ExpressionEvaluator
27  {
28  
29      /**
30       * Evaluate an expression. The optional type provided to this method is a hint (not a requirement) for the evaluator
31       * to resolve the expression to a compatible value. The evaluator is not expected to perform any conversion but
32       * rather filter out incompatible values from its result.
33       * 
34       * @param expression the expression
35       * @param type The expected type of expression result, may be {@code null}.
36       * @return the value of the expression
37       */
38      Object evaluate( String expression, Class<?> type )
39          throws ExpressionEvaluationException;
40  
41  }