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.blueprint;
018
019import java.util.LinkedHashMap;
020import java.util.Map;
021import java.util.Set;
022
023import org.apache.camel.NoSuchBeanException;
024import org.apache.camel.spi.Registry;
025import org.osgi.framework.Bundle;
026import org.osgi.service.blueprint.container.BlueprintContainer;
027import org.osgi.service.blueprint.container.NoSuchComponentException;
028import org.osgi.service.blueprint.reflect.BeanMetadata;
029import org.osgi.service.blueprint.reflect.ComponentMetadata;
030import org.osgi.service.blueprint.reflect.ReferenceMetadata;
031
032public 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        try {
042            return blueprintContainer.getComponentInstance(name);
043        } catch (NoSuchComponentException e) {
044            return null;
045        }
046    }
047
048    public <T> T lookup(String name, Class<T> type) {
049        Object answer;
050        try {
051            answer = blueprintContainer.getComponentInstance(name);
052        } catch (NoSuchComponentException e) {
053            return null;
054        }
055
056        // just to be safe
057        if (answer == null) {
058            return null;
059        }
060
061        try {
062            return type.cast(answer);
063        } catch (Throwable e) {
064            String msg = "Found bean: " + name + " in BlueprintContainer: " + blueprintContainer
065                    + " of type: " + answer.getClass().getName() + " expected type was: " + type;
066            throw new NoSuchBeanException(name, msg, e);
067        }
068    }
069
070    public <T> Map<String, T> lookupByType(Class<T> type) {
071        return lookupByType(blueprintContainer, type);
072    }
073
074    @SuppressWarnings("unchecked")
075    public static <T> Map<String, T> lookupByType(BlueprintContainer blueprintContainer, Class<T> type) {
076        Bundle bundle = (Bundle) blueprintContainer.getComponentInstance("blueprintBundle");
077        Map<String, T> objects = new LinkedHashMap<String, T>();
078        Set<String> ids = blueprintContainer.getComponentIds();
079        for (String id : ids) {
080            try {
081                ComponentMetadata metadata = blueprintContainer.getComponentMetadata(id);
082                Class<?> cl = null;
083                if (metadata instanceof BeanMetadata) {
084                    BeanMetadata beanMetadata = (BeanMetadata)metadata;
085                    cl = bundle.loadClass(beanMetadata.getClassName());
086                } else if (metadata instanceof ReferenceMetadata) {
087                    ReferenceMetadata referenceMetadata = (ReferenceMetadata)metadata;
088                    cl = bundle.loadClass(referenceMetadata.getInterface());
089                }
090                if (cl != null && type.isAssignableFrom(cl)) {
091                    Object o = blueprintContainer.getComponentInstance(metadata.getId());
092                    objects.put(metadata.getId(), type.cast(o));
093                }
094            } catch (Throwable t) {
095                // ignore
096            }
097        }
098        return objects;
099    }
100}