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.NoSuchLanguageException;
021 import org.apache.camel.spi.Language;
022 import org.apache.camel.spi.LanguageResolver;
023 import org.apache.camel.util.FactoryFinder;
024 import org.apache.camel.util.NoFactoryAvailableException;
025
026 /**
027 * Default language resolver that looks for language factories in <b>META-INF/services/org/apache/camel/language/</b> and
028 * language resolvers in <b>META-INF/services/org/apache/camel/language/resolver/</b>.
029 *
030 * @version $Revision: 659798 $
031 */
032 public class DefaultLanguageResolver implements LanguageResolver {
033 protected static final FactoryFinder LANGUAGE_FACTORY = new FactoryFinder("META-INF/services/org/apache/camel/language/");
034 protected static final FactoryFinder LANGUAGE_RESOLVER = new FactoryFinder("META-INF/services/org/apache/camel/language/resolver/");
035
036 public Language resolveLanguage(String name, CamelContext context) {
037 Class type = null;
038 try {
039 type = LANGUAGE_FACTORY.findClass(name);
040 } catch (NoFactoryAvailableException e) {
041 // ignore
042 } catch (Throwable e) {
043 throw new IllegalArgumentException("Invalid URI, no Language registered for scheme : " + name, e);
044 }
045 if (type != null) {
046 if (Language.class.isAssignableFrom(type)) {
047 return (Language)context.getInjector().newInstance(type);
048 } else {
049 throw new IllegalArgumentException("Type is not a Language implementation. Found: " + type.getName());
050 }
051 }
052 return noSpecificLanguageFound(name, context);
053 }
054
055 protected Language noSpecificLanguageFound(String name, CamelContext context) {
056 Class type = null;
057 try {
058 type = LANGUAGE_RESOLVER.findClass("default");
059 } catch (NoFactoryAvailableException e) {
060 // ignore
061 } catch (Throwable e) {
062 throw new IllegalArgumentException("Invalid URI, no Language registered for scheme : " + name, e);
063 }
064 if (type != null) {
065 if (LanguageResolver.class.isAssignableFrom(type)) {
066 LanguageResolver resolver = (LanguageResolver)context.getInjector().newInstance(type);
067 return resolver.resolveLanguage(name, context);
068 } else {
069 throw new IllegalArgumentException("Type is not a LanguageResolver implementation. Found: " + type.getName());
070 }
071 }
072 throw new NoSuchLanguageException(name);
073 }
074 }