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.HashSet;
020import java.util.LinkedHashMap;
021import java.util.Map;
022import java.util.Set;
023
024import org.apache.camel.NoSuchBeanException;
025import org.apache.camel.spi.Registry;
026import org.osgi.framework.Bundle;
027import org.osgi.service.blueprint.container.BlueprintContainer;
028import org.osgi.service.blueprint.container.NoSuchComponentException;
029import org.osgi.service.blueprint.reflect.BeanMetadata;
030import org.osgi.service.blueprint.reflect.ComponentMetadata;
031import org.osgi.service.blueprint.reflect.ReferenceMetadata;
032
033public class BlueprintContainerRegistry implements Registry {
034
035    private final BlueprintContainer blueprintContainer;
036
037    public BlueprintContainerRegistry(BlueprintContainer blueprintContainer) {
038        this.blueprintContainer = blueprintContainer;
039    }
040
041    @Override
042    public Object lookupByName(String name) {
043        try {
044            return blueprintContainer.getComponentInstance(name);
045        } catch (NoSuchComponentException e) {
046            return null;
047        }
048    }
049
050    @Override
051    public <T> T lookupByNameAndType(String name, Class<T> type) {
052        Object answer;
053        try {
054            answer = blueprintContainer.getComponentInstance(name);
055        } catch (NoSuchComponentException e) {
056            return null;
057        }
058
059        // just to be safe
060        if (answer == null) {
061            return null;
062        }
063
064        try {
065            return type.cast(answer);
066        } catch (Throwable e) {
067            String msg = "Found bean: " + name + " in BlueprintContainer: " + blueprintContainer
068                    + " of type: " + answer.getClass().getName() + " expected type was: " + type;
069            throw new NoSuchBeanException(name, msg, e);
070        }
071    }
072
073    @Override
074    public <T> Map<String, T> findByTypeWithName(Class<T> type) {
075        return lookupByType(blueprintContainer, type);
076    }
077
078    @Override
079    public <T> Set<T> findByType(Class<T> type) {
080        Map<String, T> map = lookupByType(blueprintContainer, type);
081        return new HashSet<T>(map.values());
082    }
083
084    @Override
085    public Object lookup(String name) {
086        return lookupByName(name);
087    }
088
089    @Override
090    public <T> T lookup(String name, Class<T> type) {
091        return lookupByNameAndType(name, type);
092    }
093
094    @Override
095    public <T> Map<String, T> lookupByType(Class<T> type) {
096        return findByTypeWithName(type);
097    }
098
099    public static <T> Map<String, T> lookupByType(BlueprintContainer blueprintContainer, Class<T> type) {
100        Bundle bundle = (Bundle) blueprintContainer.getComponentInstance("blueprintBundle");
101        Map<String, T> objects = new LinkedHashMap<String, T>();
102        Set<String> ids = blueprintContainer.getComponentIds();
103        for (String id : ids) {
104            try {
105                ComponentMetadata metadata = blueprintContainer.getComponentMetadata(id);
106                Class<?> cl = null;
107                if (metadata instanceof BeanMetadata) {
108                    BeanMetadata beanMetadata = (BeanMetadata)metadata;
109                    cl = bundle.loadClass(beanMetadata.getClassName());
110                } else if (metadata instanceof ReferenceMetadata) {
111                    ReferenceMetadata referenceMetadata = (ReferenceMetadata)metadata;
112                    cl = bundle.loadClass(referenceMetadata.getInterface());
113                }
114                if (cl != null && type.isAssignableFrom(cl)) {
115                    Object o = blueprintContainer.getComponentInstance(metadata.getId());
116                    objects.put(metadata.getId(), type.cast(o));
117                }
118            } catch (Throwable t) {
119                // ignore
120            }
121        }
122        return objects;
123    }
124}