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 */ 017 package org.apache.camel.impl; 018 019 import org.apache.camel.CamelContext; 020 import org.apache.camel.Component; 021 import org.apache.camel.Exchange; 022 import org.apache.camel.spi.ComponentResolver; 023 import org.apache.camel.util.FactoryFinder; 024 import org.apache.camel.util.NoFactoryAvailableException; 025 026 /** 027 * The default implementation of {@link ComponentResolver} which tries to find 028 * components by using the URI scheme prefix and searching for a file of the URI 029 * scheme name in the <b>META-INF/services/org/apache/camel/component/</b> 030 * directory on the classpath. 031 * 032 * @version $Revision: 563607 $ 033 */ 034 public class DefaultComponentResolver<E extends Exchange> implements ComponentResolver<E> { 035 protected static final FactoryFinder COMPONENT_FACTORY = 036 new FactoryFinder("META-INF/services/org/apache/camel/component/"); 037 038 public Component<E> resolveComponent(String name, CamelContext context) { 039 Class type; 040 try { 041 type = COMPONENT_FACTORY.findClass(name); 042 } catch (NoFactoryAvailableException e) { 043 return null; 044 } catch (Throwable e) { 045 throw new IllegalArgumentException("Invalid URI, no Component registered for scheme : " 046 + name, e); 047 } 048 if (type == null) { 049 return null; 050 } 051 if (Component.class.isAssignableFrom(type)) { 052 return (Component<E>)context.getInjector().newInstance(type); 053 } else { 054 throw new IllegalArgumentException("Type is not a Component implementation. Found: " 055 + type.getName()); 056 } 057 } 058 }