| /** |
| * 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.di; |
| |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.LinkedHashSet; |
| import java.util.LinkedList; |
| import java.util.List; |
| import java.util.Queue; |
| import java.util.Set; |
| import java.util.SortedSet; |
| import java.util.TreeSet; |
| |
| import org.apache.aries.blueprint.utils.ReflectionUtils; |
| import org.osgi.service.blueprint.container.ComponentDefinitionException; |
| |
| /** |
| * @version $Rev$ $Date$ |
| */ |
| public class CollectionRecipe extends AbstractRecipe { |
| |
| private final List<Recipe> list; |
| private final Class typeClass; |
| |
| public CollectionRecipe(String name, Class type) { |
| super(name); |
| if (type == null) throw new NullPointerException("type is null"); |
| this.typeClass = type; |
| this.list = new ArrayList<Recipe>(); |
| } |
| |
| public List<Recipe> getDependencies() { |
| List<Recipe> nestedRecipes = new ArrayList<Recipe>(list.size()); |
| for (Recipe recipe : list) { |
| if (recipe != null) { |
| nestedRecipes.add(recipe); |
| } |
| } |
| return nestedRecipes; |
| } |
| |
| protected Object internalCreate() throws ComponentDefinitionException { |
| Class type = getCollection(typeClass); |
| |
| if (!ReflectionUtils.hasDefaultConstructor(type)) { |
| throw new ComponentDefinitionException("Type does not have a default constructor " + type.getName()); |
| } |
| |
| // create collection instance |
| Object o; |
| try { |
| o = type.newInstance(); |
| } catch (Exception e) { |
| throw new ComponentDefinitionException("Error while creating collection instance: " + type.getName()); |
| } |
| if (!(o instanceof Collection)) { |
| throw new ComponentDefinitionException("Specified collection type does not implement the Collection interface: " + type.getName()); |
| } |
| Collection instance = (Collection) o; |
| |
| for (Recipe recipe : list) { |
| Object value; |
| if (recipe != null) { |
| try { |
| value = recipe.create(); |
| } catch (Exception e) { |
| throw new ComponentDefinitionException("Unable to convert value " + recipe + " to type " + type, e); |
| } |
| } else { |
| value = null; |
| } |
| instance.add(value); |
| } |
| return instance; |
| } |
| |
| public void add(Recipe value) { |
| list.add(value); |
| } |
| |
| public static Class getCollection(Class type) { |
| if (ReflectionUtils.hasDefaultConstructor(type)) { |
| return type; |
| } else if (SortedSet.class.isAssignableFrom(type)) { |
| return TreeSet.class; |
| } else if (Set.class.isAssignableFrom(type)) { |
| return LinkedHashSet.class; |
| } else if (List.class.isAssignableFrom(type)) { |
| return ArrayList.class; |
| } else if (Queue.class.isAssignableFrom(type)) { |
| return LinkedList.class; |
| } else { |
| return ArrayList.class; |
| } |
| } |
| } |