1 /* 2 * Copyright 2001,2004 The Apache Software Foundation. 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 org.apache.commons.scaffold.sql; 18 19 20 import java.sql.SQLException; 21 22 import javax.servlet.http.HttpServlet; 23 import javax.sql.DataSource; 24 25 26 /** 27 * Connection adaptor for a connection pool that is exposed 28 * through the servlet context, like the Struts generic 29 * connection pool. 30 * <p> 31 * The ConnectionServlet will automatically set a reference 32 * to itself if an instance of this class is specified 33 * as the ConnectionAdaptor. 34 * 35 * @author Ted Husted 36 * @version $Revision: 155464 $ $Date: 2005-02-26 13:26:54 +0000 (Sat, 26 Feb 2005) $ 37 */ 38 public class ServletAdaptor extends ConnectionAdaptor { 39 40 41 /** 42 * Field to store a link to a servlet in the application. 43 */ 44 private static HttpServlet servlet = null; 45 46 47 /** 48 * Set a reference to a servlet in the application 49 * to allow access to the servlet context. 50 */ 51 public void setServlet(HttpServlet servlet) { 52 ServletAdaptor.servlet = servlet; 53 } 54 55 56 /** 57 * Return datasource from the servlet context using 58 * key as the attribute name. 59 * 60 * @param key The attribute name for the resource. 61 * If null is passed, null is returned. 62 * @returns null or the datasource object related to "key" 63 */ 64 protected DataSource getDataSource(String key) 65 throws SQLException { 66 67 if (null==key) return null; 68 69 return (DataSource) 70 servlet.getServletContext().getAttribute(key); 71 72 } 73 74 75 // Required 76 public ServletAdaptor() { 77 78 if (null==pool) pool = this; 79 80 } 81 82 } // end ServletAdaptor 83