| /** |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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.apache.camel; |
| |
| /** |
| * An <a href="http://camel.apache.org/expression.html">expression</a> |
| * provides a plugin strategy for evaluating expressions on a message exchange to support things like |
| * <a href="http://camel.apache.org/scripting-languages.html">scripting languages</a>, |
| * <a href="http://camel.apache.org/xquery.html">XQuery</a> |
| * or <a href="http://camel.apache.org/sql.html">SQL</a> as well |
| * as any arbitrary Java expression. |
| * |
| * @version |
| */ |
| public interface Expression { |
| |
| /** |
| * Returns the value of the expression on the given exchange |
| * |
| * @param exchange the message exchange on which to evaluate the expression |
| * @param type the expected type of the evaluation result |
| * @return the value of the expression |
| */ |
| <T> T evaluate(Exchange exchange, Class<T> type); |
| } |
