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.blueprint;
018    
019    import org.apache.camel.CamelContext;
020    import org.apache.camel.Component;
021    import org.apache.camel.core.osgi.OsgiComponentResolver;
022    import org.apache.camel.spi.ComponentResolver;
023    import org.apache.camel.util.CamelContextHelper;
024    import org.osgi.framework.BundleContext;
025    import org.osgi.service.blueprint.container.NoSuchComponentException;
026    import org.slf4j.Logger;
027    import org.slf4j.LoggerFactory;
028    
029    import static org.apache.camel.util.ObjectHelper.getException;
030    
031    public class BlueprintComponentResolver extends OsgiComponentResolver {
032    
033        private static final Logger LOG = LoggerFactory.getLogger(BlueprintComponentResolver.class);
034    
035        public BlueprintComponentResolver(BundleContext bundleContext) {
036            super(bundleContext);
037        }
038    
039        @Override
040        public Component resolveComponent(String name, CamelContext context) throws Exception {
041            try {
042                Object bean = context.getRegistry().lookupByName(name);
043                if (bean instanceof Component) {
044                    LOG.debug("Found component: {} in registry: {}", name, bean);
045                    return (Component) bean;
046                } else {
047                    // let's use Camel's type conversion mechanism to convert things like CamelContext
048                    // and other types into a valid Component
049                    Component component = CamelContextHelper.convertTo(context, Component.class, bean);
050                    if (component != null) {
051                        return component;
052                    }
053                }
054            } catch (Exception e) {
055                if (getException(NoSuchComponentException.class, e) != null) {
056                    // if the caused error is NoSuchComponentException then that can be expected so ignore
057                } else {
058                    LOG.trace("Ignored error looking up bean: " + name + " due: " + e.getMessage(), e);
059                }
060            }
061            try {
062                Object bean = context.getRegistry().lookupByName(".camelBlueprint.componentResolver." + name);
063                if (bean instanceof ComponentResolver) {
064                    LOG.debug("Found component resolver: {} in registry: {}", name, bean);
065                    return ((ComponentResolver) bean).resolveComponent(name, context);
066                }
067            } catch (Exception e) {
068                LOG.trace("Ignored error looking up bean: " + name + " due: " + e.getMessage(), e);
069            }
070            return getComponent(name, context);
071        }
072    
073    }