/*
* Copyright (c) 2011 by the original author(s).
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.data.mapping.model;
import org.springframework.data.mapping.PreferredConstructor.Parameter;
import org.springframework.expression.EvaluationContext;
import org.springframework.expression.Expression;
import org.springframework.expression.spel.standard.SpelExpressionParser;
/**
* {@link ParameterValueProvider} implementation that evaluates the {@link Parameter}s key against
* {@link SpelExpressionParser} and {@link EvaluationContext}.
*
* @author Oliver Gierke
*/
public class DefaultSpELExpressionEvaluator implements SpELExpressionEvaluator {
private final Object source;
private final SpELContext factory;
/**
* @param parser
* @param factory
*/
public DefaultSpELExpressionEvaluator(Object source, SpELContext factory) {
this.source = source;
this.factory = factory;
}
/* (non-Javadoc)
* @see org.springframework.data.mapping.model.SpELExpressionEvaluator#evaluate(java.lang.String)
*/
@SuppressWarnings("unchecked")
public <T> T evaluate(String expression) {
Expression parseExpression = factory.getParser().parseExpression(expression);
return (T) parseExpression.getValue(factory.getEvaluationContext(source));
}
}