| /** |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.aries.blueprint.reflect; |
| |
| import java.io.Serializable; |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.Comparator; |
| import java.util.List; |
| |
| import org.apache.aries.blueprint.PassThroughMetadata; |
| import org.osgi.service.blueprint.reflect.BeanArgument; |
| import org.osgi.service.blueprint.reflect.BeanMetadata; |
| import org.osgi.service.blueprint.reflect.CollectionMetadata; |
| import org.osgi.service.blueprint.reflect.ComponentMetadata; |
| import org.osgi.service.blueprint.reflect.IdRefMetadata; |
| import org.osgi.service.blueprint.reflect.MapMetadata; |
| import org.osgi.service.blueprint.reflect.Metadata; |
| import org.osgi.service.blueprint.reflect.NullMetadata; |
| import org.osgi.service.blueprint.reflect.PropsMetadata; |
| import org.osgi.service.blueprint.reflect.ReferenceListMetadata; |
| import org.osgi.service.blueprint.reflect.RefMetadata; |
| import org.osgi.service.blueprint.reflect.ReferenceMetadata; |
| import org.osgi.service.blueprint.reflect.ServiceMetadata; |
| import org.osgi.service.blueprint.reflect.Target; |
| import org.osgi.service.blueprint.reflect.ValueMetadata; |
| |
| |
| /** |
| * A utility class that handles cloning various polymorphic |
| * bits of metadata into concrete class implementations. |
| * |
| * @version $Rev$, $Date$ |
| */ |
| public class MetadataUtil { |
| |
| public static final Comparator<BeanArgument> BEAN_COMPARATOR = new BeanArgumentComparator(); |
| |
| static public Metadata cloneMetadata(Metadata source) { |
| if (source == null) { |
| return null; |
| } |
| else if (source instanceof MapMetadata) { |
| return new MapMetadataImpl((MapMetadata)source); |
| } |
| else if (source instanceof NullMetadata) { |
| return NullMetadata.NULL; |
| } |
| else if (source instanceof PropsMetadata) { |
| return new PropsMetadataImpl((PropsMetadata)source); |
| } |
| else if (source instanceof RefMetadata) { |
| return new RefMetadataImpl((RefMetadata)source); |
| } |
| else if (source instanceof IdRefMetadata) { |
| return new IdRefMetadataImpl((IdRefMetadata)source); |
| } |
| else if (source instanceof ValueMetadata) { |
| return new ValueMetadataImpl((ValueMetadata)source); |
| } |
| else if (source instanceof BeanMetadata) { |
| return new BeanMetadataImpl((BeanMetadata)source); |
| } |
| else if (source instanceof ReferenceListMetadata) { |
| return new ReferenceListMetadataImpl((ReferenceListMetadata)source); |
| } |
| else if (source instanceof ServiceMetadata) { |
| return new ServiceMetadataImpl((ServiceMetadata)source); |
| } |
| else if (source instanceof ReferenceMetadata) { |
| return new ReferenceMetadataImpl((ReferenceMetadata)source); |
| } |
| else if (source instanceof CollectionMetadata) { |
| return new CollectionMetadataImpl((CollectionMetadata)source); |
| } |
| else if (source instanceof PassThroughMetadata) { |
| return new PassThroughMetadataImpl((PassThroughMetadata)source); |
| } |
| |
| throw new RuntimeException("Unknown Metadata type received: " + source.getClass().getName()); |
| } |
| |
| |
| /** |
| * Clone a component metadata item, returning a mutable |
| * instance. |
| * |
| * @param source The source metadata item. |
| * |
| * @return A mutable instance of this metadata item. |
| */ |
| static public ComponentMetadata cloneComponentMetadata(ComponentMetadata source) { |
| return (ComponentMetadata) cloneMetadata(source); |
| } |
| |
| /** |
| * Clone a target item, returning a mutable |
| * instance. |
| * |
| * @param source The source target item. |
| * |
| * @return A mutable instance of this target item. |
| */ |
| static public Target cloneTarget(Target source) { |
| return (Target) cloneMetadata(source); |
| } |
| |
| /** |
| * Create a new metadata instance of the given type |
| * |
| * @param type the class of the Metadata object to create |
| * @param <T> |
| * @return a new instance |
| */ |
| public static <T extends Metadata> T createMetadata(Class<T> type) { |
| if (MapMetadata.class.isAssignableFrom(type)) { |
| return type.cast(new MapMetadataImpl()); |
| } else if (NullMetadata.class.isAssignableFrom(type)) { |
| return type.cast(NullMetadata.NULL); |
| } else if (PropsMetadata.class.isAssignableFrom(type)) { |
| return type.cast(new PropsMetadataImpl()); |
| } else if (RefMetadata.class.isAssignableFrom(type)) { |
| return type.cast(new RefMetadataImpl()); |
| } else if (IdRefMetadata.class.isAssignableFrom(type)) { |
| return type.cast(new IdRefMetadataImpl()); |
| } else if (ValueMetadata.class.isAssignableFrom(type)) { |
| return type.cast(new ValueMetadataImpl()); |
| } else if (BeanMetadata.class.isAssignableFrom(type)) { |
| return type.cast(new BeanMetadataImpl()); |
| } else if (ReferenceListMetadata.class.isAssignableFrom(type)) { |
| return type.cast(new ReferenceListMetadataImpl()); |
| } else if (ServiceMetadata.class.isAssignableFrom(type)) { |
| return type.cast(new ServiceMetadataImpl()); |
| } else if (ReferenceMetadata.class.isAssignableFrom(type)) { |
| return type.cast(new ReferenceMetadataImpl()); |
| } else if (CollectionMetadata.class.isAssignableFrom(type)) { |
| return type.cast(new CollectionMetadataImpl()); |
| } else if (PassThroughMetadata.class.isAssignableFrom(type)) { |
| return type.cast(new PassThroughMetadataImpl()); |
| } else { |
| throw new IllegalArgumentException("Unsupport metadata type: " + (type != null ? type.getName() : null)); |
| } |
| } |
| |
| public static List<BeanArgument> validateBeanArguments(List<BeanArgument> arguments) { |
| if (arguments == null || arguments.isEmpty()) { |
| return arguments; |
| } |
| // check if all or none arguments have index attribute |
| boolean hasIndexFirst = (arguments.get(0).getIndex() > -1); |
| for (int i = 1; i < arguments.size(); i++) { |
| boolean hasIndex = (arguments.get(i).getIndex() > -1); |
| if ( (hasIndexFirst && !hasIndex) || |
| (!hasIndexFirst && hasIndex) ) { |
| throw new IllegalArgumentException("Index attribute must be specified either on all or none constructor arguments"); |
| } |
| } |
| if (hasIndexFirst) { |
| // sort the arguments |
| List<BeanArgument> argumentsCopy = new ArrayList<BeanArgument>(arguments); |
| Collections.sort(argumentsCopy, MetadataUtil.BEAN_COMPARATOR); |
| arguments = argumentsCopy; |
| |
| // check if the indexes are sequential |
| for (int i = 0; i < arguments.size(); i++) { |
| int index = arguments.get(i).getIndex(); |
| if (index > i) { |
| throw new IllegalArgumentException("Missing attribute index"); |
| } else if (index < i) { |
| throw new IllegalArgumentException("Duplicate attribute index"); |
| } // must be the same |
| } |
| } |
| |
| return arguments; |
| } |
| |
| public static boolean isPrototypeScope(BeanMetadata metadata) { |
| return (BeanMetadata.SCOPE_PROTOTYPE.equals(metadata.getScope()) || |
| (metadata.getScope() == null && metadata.getId() == null)); |
| } |
| |
| public static boolean isSingletonScope(BeanMetadata metadata) { |
| return (BeanMetadata.SCOPE_SINGLETON.equals(metadata.getScope()) || |
| (metadata.getScope() == null && metadata.getId() != null)); |
| } |
| |
| public static boolean isCustomScope(BeanMetadata metadata) { |
| return (metadata.getScope() != null && |
| !BeanMetadata.SCOPE_PROTOTYPE.equals(metadata.getScope()) && |
| !BeanMetadata.SCOPE_SINGLETON.equals(metadata.getScope())); |
| } |
| |
| private static class BeanArgumentComparator implements Comparator<BeanArgument>, Serializable { |
| public int compare(BeanArgument object1, BeanArgument object2) { |
| return object1.getIndex() - object2.getIndex(); |
| } |
| } |
| |
| } |
| |