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: 41838 $ 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 }