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 java.util.LinkedHashMap;
020 import java.util.Map;
021 import java.util.Set;
022
023 import org.apache.camel.NoSuchBeanException;
024 import org.apache.camel.spi.Registry;
025 import org.osgi.framework.Bundle;
026 import org.osgi.service.blueprint.container.BlueprintContainer;
027 import org.osgi.service.blueprint.container.NoSuchComponentException;
028 import org.osgi.service.blueprint.reflect.BeanMetadata;
029 import org.osgi.service.blueprint.reflect.ComponentMetadata;
030 import org.osgi.service.blueprint.reflect.ReferenceMetadata;
031
032 public class BlueprintContainerRegistry implements Registry {
033
034 private final BlueprintContainer blueprintContainer;
035
036 public BlueprintContainerRegistry(BlueprintContainer blueprintContainer) {
037 this.blueprintContainer = blueprintContainer;
038 }
039
040 public Object lookup(String name) {
041 return blueprintContainer.getComponentInstance(name);
042 }
043
044 public <T> T lookup(String name, Class<T> type) {
045 Object answer;
046 try {
047 answer = blueprintContainer.getComponentInstance(name);
048 } catch (NoSuchComponentException e) {
049 return null;
050 }
051
052 // just to be safe
053 if (answer == null) {
054 return null;
055 }
056
057 try {
058 return type.cast(answer);
059 } catch (Throwable e) {
060 String msg = "Found bean: " + name + " in BlueprintContainer: " + blueprintContainer
061 + " of type: " + answer.getClass().getName() + " expected type was: " + type;
062 throw new NoSuchBeanException(name, msg, e);
063 }
064 }
065
066 public <T> Map<String, T> lookupByType(Class<T> type) {
067 return lookupByType(blueprintContainer, type);
068 }
069
070 @SuppressWarnings("unchecked")
071 public static <T> Map<String, T> lookupByType(BlueprintContainer blueprintContainer, Class<T> type) {
072 Bundle bundle = (Bundle) blueprintContainer.getComponentInstance("blueprintBundle");
073 Map<String, T> objects = new LinkedHashMap<String, T>();
074 Set<String> ids = blueprintContainer.getComponentIds();
075 for (String id : ids) {
076 try {
077 ComponentMetadata metadata = blueprintContainer.getComponentMetadata(id);
078 Class<?> cl = null;
079 if (metadata instanceof BeanMetadata) {
080 BeanMetadata beanMetadata = (BeanMetadata)metadata;
081 cl = bundle.loadClass(beanMetadata.getClassName());
082 } else if (metadata instanceof ReferenceMetadata) {
083 ReferenceMetadata referenceMetadata = (ReferenceMetadata)metadata;
084 cl = bundle.loadClass(referenceMetadata.getInterface());
085 }
086 if (cl != null && type.isAssignableFrom(cl)) {
087 Object o = blueprintContainer.getComponentInstance(metadata.getId());
088 objects.put(metadata.getId(), type.cast(o));
089 }
090 } catch (Throwable t) {
091 // ignore
092 }
093 }
094 return objects;
095 }
096 }