001/** 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.camel; 018 019/** 020 * Evaluates a binary <a 021 * href="http://camel.apache.org/predicate.html">predicate</a> on the 022 * message exchange to support things like <a 023 * href="http://camel.apache.org/scripting-languages.html">scripting 024 * languages</a>, <a href="http://camel.apache.org/xquery.html">XQuery</a> 025 * or <a href="http://camel.apache.org/sql.html">SQL</a> as well as 026 * any arbitrary Java expression. 027 * 028 * @version 029 */ 030public interface Predicate { 031 032 /** 033 * Evaluates the predicate on the message exchange and returns true if this 034 * exchange matches the predicate 035 * 036 * @param exchange the message exchange 037 * @return true if the predicate matches 038 */ 039 boolean matches(Exchange exchange); 040 041}