1 package org.apache.onami.persist; 2 3 /* 4 * Licensed to the Apache Software Foundation (ASF) under one 5 * or more contributor license agreements. See the NOTICE file 6 * distributed with this work for additional information 7 * regarding copyright ownership. The ASF licenses this file 8 * to you under the Apache License, Version 2.0 (the 9 * "License"); you may not use this file except in compliance 10 * with the License. You may obtain a copy of the License at 11 * 12 * http://www.apache.org/licenses/LICENSE-2.0 13 * 14 * Unless required by applicable law or agreed to in writing, 15 * software distributed under the License is distributed on an 16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 17 * KIND, either express or implied. See the License for the 18 * specific language governing permissions and limitations 19 * under the License. 20 */ 21 22 import javax.inject.Singleton; 23 import javax.naming.InitialContext; 24 import javax.naming.NamingException; 25 26 /** 27 * Helper class which does a JNDI lookup and handles exceptions. 28 */ 29 @Singleton 30 class JndiLookupHelper 31 { 32 33 /** 34 * Does the actual JNDI lookup. 35 * 36 * @param type type of the object to lookup 37 * @param jndiName name of the object to lookup 38 * @param <T> type of the object to lookup 39 * @return the object provided by the JNDI context. 40 */ 41 @SuppressWarnings( "unchecked" ) 42 <T> T doJndiLookup( Class<T> type, String jndiName ) 43 { 44 try 45 { 46 final InitialContext ctx = new InitialContext(); 47 final T result = (T) ctx.lookup( jndiName ); 48 49 Preconditions.checkNotNull( result, "lookup for " + type.getSimpleName() + " with JNDI name '" + jndiName 50 + "' returned null" ); 51 52 return result; 53 } 54 catch ( NamingException e ) 55 { 56 throw new RuntimeException( 57 "lookup for " + type.getSimpleName() + " with JNDI name '" + jndiName + "' failed", e ); 58 } 59 } 60 61 }