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 import javax.naming.Context; 22 import javax.naming.NamingException; 23 24 /** 25 * Integrates Guice with JNDI. Requires a binding to {@link javax.naming.Context}. 26 * 27 * @author crazybob@google.com (Bob Lee) 28 */ 29 public class JndiIntegration { 30 JndiIntegration()31 private JndiIntegration() {} 32 33 /** 34 * Creates a provider which looks up objects in JNDI using the given name. Example usage: 35 * 36 * <pre> 37 * bind(DataSource.class).toProvider(fromJndi(DataSource.class, "java:...")); 38 * </pre> 39 */ fromJndi(Class<T> type, String name)40 public static <T> Provider<T> fromJndi(Class<T> type, String name) { 41 return new JndiProvider<T>(type, name); 42 } 43 44 static class JndiProvider<T> implements Provider<T> { 45 46 @Inject Context context; 47 final Class<T> type; 48 final String name; 49 JndiProvider(Class<T> type, String name)50 public JndiProvider(Class<T> type, String name) { 51 this.type = type; 52 this.name = name; 53 } 54 55 @Override get()56 public T get() { 57 try { 58 return type.cast(context.lookup(name)); 59 } catch (NamingException e) { 60 throw new RuntimeException(e); 61 } 62 } 63 } 64 } 65