diff --git a/spring-integration-core/src/main/java/org/springframework/integration/handler/ExpressionPayloadMessageProcessor.java b/spring-integration-core/src/main/java/org/springframework/integration/handler/ExpressionPayloadMessageProcessor.java new file mode 100644 index 0000000000..4ad7d91684 --- /dev/null +++ b/spring-integration-core/src/main/java/org/springframework/integration/handler/ExpressionPayloadMessageProcessor.java @@ -0,0 +1,44 @@ +/* + * Copyright 2002-2010 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.handler; + +import org.springframework.expression.Expression; +import org.springframework.integration.Message; + +/** + * A MessageProcessor implementation that expects an Expression or expressionString + * as the Message payload. When processing, it simply evaluates that expression. + * + * @author Dave Syer + * @author Mark Fisher + * @since 2.0 + */ +public class ExpressionPayloadMessageProcessor extends AbstractMessageProcessor { + + /** + * Evaluates the Message payload expression. + * @throws IllegalArgumentException if the payload is not an Exception or String + */ + public Object processMessage(Message message) { + Object expression = message.getPayload(); + if (expression instanceof Expression) { + return evaluateExpression((Expression) expression, message); + } + if (expression instanceof String) { + return evaluateExpression((String) expression, message); + } + throw new IllegalArgumentException("Message payload must be an Expression instance or an expression String."); + } + +}