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.activemq.jndi;
018
019import javax.naming.NameNotFoundException;
020import javax.naming.NamingException;
021
022/**
023 * Allows users to dynamically create items
024 * 
025 * 
026 */
027public abstract class LazyCreateContext extends ReadOnlyContext {
028    public Object lookup(String name) throws NamingException {
029        try {
030            return super.lookup(name);
031        } catch (NameNotFoundException e) {
032            Object answer = createEntry(name);
033            if (answer == null) {
034                throw e;
035            }
036            internalBind(name, answer);
037            return answer;
038        }
039    }
040
041    protected abstract Object createEntry(String name);
042}