1 /** 2 * Copyright (C) 2006 Google Inc. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.google.inject.jndi; 18 19 import com.google.inject.Inject; 20 import com.google.inject.Provider; 21 22 import javax.naming.Context; 23 import javax.naming.NamingException; 24 25 /** 26 * Integrates Guice with JNDI. Requires a binding to 27 * {@link javax.naming.Context}. 28 * 29 * @author crazybob@google.com (Bob Lee) 30 */ 31 public class JndiIntegration { 32 JndiIntegration()33 private JndiIntegration() {} 34 35 /** 36 * Creates a provider which looks up objects in JNDI using the given name. 37 * Example usage: 38 * 39 * <pre> 40 * bind(DataSource.class).toProvider(fromJndi(DataSource.class, "java:...")); 41 * </pre> 42 */ fromJndi(Class<T> type, String name)43 public static <T> Provider<T> fromJndi(Class<T> type, String name) { 44 return new JndiProvider<T>(type, name); 45 } 46 47 static class JndiProvider<T> implements Provider<T> { 48 49 @Inject Context context; 50 final Class<T> type; 51 final String name; 52 JndiProvider(Class<T> type, String name)53 public JndiProvider(Class<T> type, String name) { 54 this.type = type; 55 this.name = name; 56 } 57 get()58 public T get() { 59 try { 60 return type.cast(context.lookup(name)); 61 } 62 catch (NamingException e) { 63 throw new RuntimeException(e); 64 } 65 } 66 } 67 } 68