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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   */
24  public interface TypeAwareExpressionEvaluator extends ExpressionEvaluator {
25  
26      /**
27       * Evaluate an expression. The optional type provided to this method is a hint (not a requirement) for the evaluator
28       * to resolve the expression to a compatible value. The evaluator is not expected to perform any conversion but
29       * rather filter out incompatible values from its result.
30       *
31       * @param expression the expression
32       * @param type The expected type of expression result, may be {@code null}.
33       * @return the value of the expression
34       * @throws ExpressionEvaluationException in case of an error.
35       */
36      Object evaluate(String expression, Class<?> type) throws ExpressionEvaluationException;
37  }