1 /*
2 * The Apache Software License, Version 1.1
3 *
4 * Copyright (c) 1999 The Apache Software Foundation. All rights
5 * reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 *
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
17 * distribution.
18 *
19 * 3. The end-user documentation included with the redistribution, if
20 * any, must include the following acknowlegement:
21 * "This product includes software developed by the
22 * Apache Software Foundation (http://www.apache.org/)."
23 * Alternately, this acknowlegement may appear in the software itself,
24 * if and wherever such third-party acknowlegements normally appear.
25 *
26 * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
27 * Foundation" must not be used to endorse or promote products derived
28 * from this software without prior written permission. For written
29 * permission, please contact apache@apache.org.
30 *
31 * 5. Products derived from this software may not be called "Apache"
32 * nor may "Apache" appear in their names without prior written
33 * permission of the Apache Group.
34 *
35 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
36 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
37 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
38 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
39 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
40 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
41 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
42 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
43 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
44 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
45 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
46 * SUCH DAMAGE.
47 * ====================================================================
48 *
49 * This software consists of voluntary contributions made by many
50 * individuals on behalf of the Apache Software Foundation. For more
51 * information on the Apache Software Foundation, please see
52 * <http://www.apache.org/>.
53 *
54 */
55
56 package org.apache.commons.jelly.tags.sql;
57
58 import java.util.*;
59
60 import org.apache.commons.jelly.JellyContext;
61 import org.apache.commons.jelly.JellyException;
62 import org.apache.commons.jelly.TagSupport;
63 import org.apache.commons.jelly.XMLOutput;
64
65 /***
66 * <p>Tag handler for <Driver> in JSTL, used to create
67 * a simple DataSource for prototyping.</p>
68 *
69 * @author Hans Bergsten
70 */
71 public class DriverTag extends TagSupport {
72 private static final String DRIVER_CLASS_NAME =
73 "javax.servlet.jsp.jstl.sql.driver";
74 private static final String JDBC_URL = "javax.servlet.jsp.jstl.sql.jdbcURL";
75 private static final String USER_NAME = "javax.servlet.jsp.jstl.sql.userName";
76 private static final String PASSWORD = "javax.servlet.jsp.jstl.sql.password";
77
78 private String driverClassName;
79 private String jdbcURL;
80 private String scope = "page";
81 private String userName;
82 private String var;
83
84 //**********************************************************************
85 // Accessor methods
86
87 public void setDriver(String driverClassName) {
88 this.driverClassName = driverClassName;
89 }
90
91 public void setJdbcURL(String jdbcURL) {
92 this.jdbcURL = jdbcURL;
93 }
94
95 /**
96 * Sets the scope of the variable to hold the
97 * result.
98 *
99 */
100 public void setScope(String scopeName) {
101 this.scope = scopeName;
102 }
103
104 public void setUserName(String userName) {
105 this.userName = userName;
106 }
107
108 public void setVar(String var) {
109 this.var = var;
110 }
111
112 //**********************************************************************
113 // Tag logic
114
115 public void doTag(XMLOutput output) throws Exception {
116 DataSourceWrapper ds = new DataSourceWrapper();
117 try {
118 ds.setDriverClassName(getDriverClassName());
119 }
120 catch (Exception e) {
121 throw new JellyException("Invalid driver class name: " + e.getMessage());
122 }
123 ds.setJdbcURL(getJdbcURL());
124 ds.setUserName(getUserName());
125 ds.setPassword(getPassword());
126 context.setVariable(var, ds);
127 }
128
129 //*********************************************************************
130 // Private utility methods
131
132 private String getDriverClassName() {
133 if (driverClassName != null) {
134 return driverClassName;
135 }
136 return getInitParameter(DRIVER_CLASS_NAME);
137 }
138
139 private String getJdbcURL() {
140 if (jdbcURL != null) {
141 return jdbcURL;
142 }
143 return getInitParameter(JDBC_URL);
144 }
145
146 private String getUserName() {
147 if (userName != null) {
148 return userName;
149 }
150 return getInitParameter(USER_NAME);
151 }
152
153 private String getPassword() {
154 return getInitParameter(PASSWORD);
155 }
156
157 protected String getInitParameter(String key) {
158 return "";
159 }
160 }
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