001    /**
002     *
003     * Licensed to the Apache Software Foundation (ASF) under one or more
004     * contributor license agreements.  See the NOTICE file distributed with
005     * this work for additional information regarding copyright ownership.
006     * The ASF licenses this file to You under the Apache License, Version 2.0
007     * (the "License"); you may not use this file except in compliance with
008     * the License.  You may obtain a copy of the License at
009     *
010     *     http://www.apache.org/licenses/LICENSE-2.0
011     *
012     *  Unless required by applicable law or agreed to in writing, software
013     *  distributed under the License is distributed on an "AS IS" BASIS,
014     *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015     *  See the License for the specific language governing permissions and
016     *  limitations under the License.
017     */
018    package org.apache.xbean.recipe;
019    
020    import java.util.SortedMap;
021    import java.util.TreeMap;
022    
023    public class DefaultRepository implements Repository {
024        /**
025         * The unmarshaled object instances by name.
026         */
027        private final SortedMap<String, Object> instances = new TreeMap<String, Object>();
028    
029        /**
030         * Does this repository contain a object with the specified name.
031         *
032         * @param name the unique name of the object instance
033         * @return true if this repository contain a object with the specified name
034         */
035        public boolean contains(String name) {
036            return instances.containsKey(name);
037        }
038    
039        /**
040         * Gets the object or recipe with the specified name from this repository.
041         *
042         * @param name the unique name of the object instance
043         * @return the object instance, a recipe to build the object or null
044         */
045        public Object get(String name) {
046            return instances.get(name);
047        }
048    
049        /**
050         * Add an object instance to this repository.
051         *
052         * @param name the unique name of the instance
053         * @param instance the instance
054         * @throws ConstructionException if another object instance is already registered with the name
055         */
056        public void add(String name, Object instance) {
057            if (instances.containsKey(name) && !(instances.get(name) instanceof Recipe)) {
058                throw new ConstructionException("Name " + name + " is already registered to instance " + instance);
059            }
060            instances.put(name, instance);
061        }
062    }