org.apache.taglibs.standard.tag.common.sql.DriverTag Maven / Gradle / Ivy
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Jakarta Standard Tag Library Implementation
/*
* Copyright (c) 1997, 2020 Oracle and/or its affiliates. All rights reserved.
* Copyright 2004 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.taglibs.standard.tag.common.sql;
import jakarta.servlet.ServletContext;
import jakarta.servlet.jsp.JspException;
import jakarta.servlet.jsp.JspTagException;
import jakarta.servlet.jsp.PageContext;
import jakarta.servlet.jsp.tagext.TagSupport;
/**
* Tag handler for <Driver> in JSTL, used to create
* a simple DataSource for prototyping.
*
* @author Hans Bergsten
*/
public class DriverTag extends TagSupport {
private static final String DRIVER_CLASS_NAME =
"jakarta.servlet.jsp.jstl.sql.driver";
private static final String JDBC_URL =
"jakarta.servlet.jsp.jstl.sql.jdbcURL";
private static final String USER_NAME =
"jakarta.servlet.jsp.jstl.sql.userName";
private static final String PASSWORD =
"jakarta.servlet.jsp.jstl.sql.password";
private String driverClassName;
private String jdbcURL;
private int scope = PageContext.PAGE_SCOPE;
private String userName;
private String var;
//*********************************************************************
// Accessor methods
public void setDriver(String driverClassName) {
this.driverClassName = driverClassName;
}
public void setJdbcURL(String jdbcURL) {
this.jdbcURL = jdbcURL;
}
/**
* Setter method for the scope of the variable to hold the
* result.
*
*/
public void setScope(String scopeName) {
if ("page".equals(scopeName)) {
scope = PageContext.PAGE_SCOPE;
}
else if ("request".equals(scopeName)) {
scope = PageContext.REQUEST_SCOPE;
}
else if ("session".equals(scopeName)) {
scope = PageContext.SESSION_SCOPE;
}
else if ("application".equals(scopeName)) {
scope = PageContext.APPLICATION_SCOPE;
}
}
public void setUserName(String userName) {
this.userName = userName;
}
public void setVar(String var) {
this.var = var;
}
//*********************************************************************
// Tag logic
public int doStartTag() throws JspException {
DataSourceWrapper ds = new DataSourceWrapper();
try {
ds.setDriverClassName(getDriverClassName());
}
catch (Exception e) {
throw new JspTagException("Invalid driver class name: " +
e.toString(), e);
}
ds.setJdbcURL(getJdbcURL());
ds.setUserName(getUserName());
ds.setPassword(getPassword());
pageContext.setAttribute(var, ds, scope);
return SKIP_BODY;
}
//*********************************************************************
// Private utility methods
private String getDriverClassName() {
if (driverClassName != null) {
return driverClassName;
}
ServletContext application = pageContext.getServletContext();
return application.getInitParameter(DRIVER_CLASS_NAME);
}
private String getJdbcURL() {
if (jdbcURL != null) {
return jdbcURL;
}
ServletContext application = pageContext.getServletContext();
return application.getInitParameter(JDBC_URL);
}
private String getUserName() {
if (userName != null) {
return userName;
}
ServletContext application = pageContext.getServletContext();
return application.getInitParameter(USER_NAME);
}
private String getPassword() {
ServletContext application = pageContext.getServletContext();
return application.getInitParameter(PASSWORD);
}
}