/*
* Copyright 2002-2014 the original author or authors.
*
* 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.integration.endpoint;
import org.springframework.expression.Expression;
import org.springframework.integration.context.ExpressionCapable;
import org.springframework.util.Assert;
/**
* @author Mark Fisher
* @author Gary Russell
* @since 2.0
*/
public class ExpressionEvaluatingMessageSource<T> extends AbstractMessageSource<T> implements ExpressionCapable {
private final Expression expression;
private final Class<T> expectedType;
public ExpressionEvaluatingMessageSource(Expression expression, Class<T> expectedType) {
Assert.notNull(expression, "expression must not be null");
this.expression = expression;
this.expectedType = expectedType;
}
@Override
public String getComponentType() {
return "inbound-channel-adapter";
}
@Override
public T doReceive() {
return this.evaluateExpression(this.expression, this.expectedType);
}
@Override
public Expression getExpression() {
return this.expression;
}
}