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.impl;
018
019import java.io.IOException;
020
021import org.apache.camel.CamelContext;
022import org.apache.camel.ExtendedCamelContext;
023import org.apache.camel.RuntimeCamelException;
024import org.apache.camel.spi.FactoryFinder;
025import org.apache.camel.spi.ModelToXMLDumper;
026import org.slf4j.Logger;
027import org.slf4j.LoggerFactory;
028
029/**
030 * Factory to create the {@link ModelToXMLDumper} implementation to be used.
031 *
032 * @see ModelToXMLDumper
033 */
034public class ModelToXMLDumperResolver {
035
036    public static final String RESOURCE_PATH = "META-INF/services/org/apache/camel/";
037
038    private static final Logger LOG = LoggerFactory.getLogger(ModelToXMLDumperResolver.class);
039
040    private FactoryFinder factoryFinder;
041
042    public ModelToXMLDumper resolve(CamelContext context) {
043        // use factory finder to find a custom implementations
044        Class<?> type = null;
045        try {
046            type = findFactory("modelxml-dumper", context);
047        } catch (Exception e) {
048            // ignore
049        }
050
051        if (type != null) {
052            if (LOG.isDebugEnabled()) {
053                LOG.debug("Found ModelToXMLDumper: {} via: {}{}", type.getName(), factoryFinder.getResourcePath(), "modelxml-dumper");
054            }
055            if (ModelToXMLDumper.class.isAssignableFrom(type)) {
056                ModelToXMLDumper answer = (ModelToXMLDumper) context.getInjector().newInstance(type, false);
057                LOG.info("Detected and using ModelToXMLDumper: {}", answer);
058                return answer;
059            } else {
060                throw new IllegalArgumentException("Type is not a ModelToXMLDumper implementation. Found: " + type.getName());
061            }
062        }
063
064        throw new RuntimeCamelException("Cannot find XML routes dumper in classpath. Add camel-xml-jaxb to the classpath.");
065    }
066
067    private Class<?> findFactory(String name, CamelContext context) throws IOException {
068        if (factoryFinder == null) {
069            factoryFinder = context.adapt(ExtendedCamelContext.class).getFactoryFinder(RESOURCE_PATH);
070        }
071        return factoryFinder.findClass(name).orElse(null);
072    }
073
074}
075