01: /*
02: * Copyright 2004-2007 the original author or authors.
03: *
04: * Licensed under the Apache License, Version 2.0 (the "License");
05: * you may not use this file except in compliance with the License.
06: * You may obtain a copy of the License at
07: *
08: * http://www.apache.org/licenses/LICENSE-2.0
09: *
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 on 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: *
23: * @author Keith Donald
24: */
25: public interface Expression {
26:
27: /**
28: * Evaluate the expression encapsulated by this evaluator against the
29: * provided target object and return the result of the evaluation.
30: * @param target the target of the expression
31: * @param context the expression evaluation context
32: * @return the evaluation result
33: * @throws EvaluationException an exception occured during evaluation
34: */
35: public Object evaluate(Object target, EvaluationContext context)
36: throws EvaluationException;
37: }
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