001 /**
002 *
003 * Licensed to the Apache Software Foundation (ASF) under one or more
004 * contributor license agreements. See the NOTICE file distributed with
005 * this work for additional information regarding copyright ownership.
006 * The ASF licenses this file to You under the Apache License, Version 2.0
007 * (the "License"); you may not use this file except in compliance with
008 * the License. You may obtain a copy of the License at
009 *
010 * http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018 package org.apache.camel.impl;
019
020 import org.apache.camel.CamelContext;
021 import org.apache.camel.Component;
022 import org.apache.camel.Exchange;
023 import org.apache.camel.spi.ComponentResolver;
024 import org.apache.camel.util.FactoryFinder;
025 import org.apache.camel.util.NoFactoryAvailableException;
026
027 /**
028 * The default implementation of {@link ComponentResolver}
029 * which tries to find components by using the URI scheme prefix and searching for a file of the URI
030 * scheme name in the <b>META-INF/services/org/apache/camel/component/</b>
031 * directory on the classpath.
032 *
033 * @version $Revision: 530555 $
034 */
035 public class DefaultComponentResolver<E extends Exchange> implements ComponentResolver<E> {
036 protected static final FactoryFinder componentFactory = 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 = componentFactory.findClass(name);
042 }
043 catch (NoFactoryAvailableException e) {
044 return null;
045 }
046 catch (Throwable e) {
047 throw new IllegalArgumentException("Invalid URI, no EndpointResolver registered for scheme : " + name, e);
048 }
049 if (type == null) {
050 return null;
051 }
052 if (Component.class.isAssignableFrom(type)) {
053 return (Component<E>)context.getInjector().newInstance(type);
054 }
055 else {
056 throw new IllegalArgumentException("Type is not a Component implementation. Found: " + type.getName());
057 }
058 }
059 }