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Java > Open Source Codes > org > springframework > binding > expression > Expression


1 /*
2  * Copyright 2002-2006 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 package org.springframework.binding.expression;
17
18 /**
19  * Evaluates a single parsed expression of the provided input object in the
20  * specified context. This provides a common abstraction for expression
21  * evaluation independent of any language like OGNL or Spring's BeanWrapper.
22  * @author Keith Donald
23  */
24 public interface Expression {
25
26     /**
27      * Evaluate the expression encapsulated by this evaluator against the
28      * provided target object and return the result of the evaluation.
29      * @param target The target of the expression
30      * @param context The expression evaluation context
31      * @return the evaluation result
32      * @throws EvaluationException an exception occured during evaluation.
33      */
34     public Object JavaDoc evaluate(Object JavaDoc target, EvaluationContext context) throws EvaluationException;
35 }
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