/*
* $Header: /home/cvs/jakarta-struts/src/example/org/apache/struts/webapp/example/LinkSubscriptionTag.java,v 1.5 2003/01/18 19:48:56 craigmcc Exp $
* $Revision: 1.5 $
* $Date: 2003/01/18 19:48:56 $
*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999-2001 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Struts", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package org.apache.struts.webapp.example;
import java.io.IOException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.TagSupport;
import org.apache.struts.util.MessageResources;
import org.apache.struts.util.ResponseUtils;
import org.apache.struts.config.ModuleConfig;
/**
* Generate a URL-encoded hyperlink to the specified URI, with
* associated query parameters selecting a specified Subscription.
*
* @author Craig R. McClanahan
* @version $Revision: 1.5 $ $Date: 2003/01/18 19:48:56 $
*/
public class LinkSubscriptionTag extends TagSupport {
// ----------------------------------------------------- Instance Variables
/**
* The context-relative URI.
*/
protected String page = null;
/**
* The message resources for this package.
*/
protected static MessageResources messages =
MessageResources.getMessageResources
("org.apache.struts.webapp.example.ApplicationResources");
/**
* The attribute name.
*/
private String name = "subscription";
// ------------------------------------------------------------- Properties
/**
* Return the context-relative URI.
*/
public String getPage() {
return (this.page);
}
/**
* Set the context-relative URI.
*
* @param page Set the context-relative URI
*/
public void setPage(String page) {
this.page = page;
}
/**
* Return the attribute name.
*/
public String getName() {
return (this.name);
}
/**
* Set the attribute name.
*
* @param name The new attribute name
*/
public void setName(String name) {
this.name = name;
}
// --------------------------------------------------------- Public Methods
/**
* Render the beginning of the hyperlink.
*
* @exception JspException if a JSP exception has occurred
*/
public int doStartTag() throws JspException {
// Generate the URL to be encoded
ModuleConfig config = (ModuleConfig) pageContext.getRequest()
.getAttribute(org.apache.struts.Globals.MODULE_KEY);
HttpServletRequest request =
(HttpServletRequest) pageContext.getRequest();
StringBuffer url = new StringBuffer(request.getContextPath());
url.append(config.getPrefix());
url.append(page);
Subscription subscription = null;
try {
subscription = (Subscription) pageContext.findAttribute(name);
} catch (ClassCastException e) {
subscription = null;
}
if (subscription == null)
throw new JspException
(messages.getMessage("linkSubscription.noSubscription", name));
if (page.indexOf("?") < 0)
url.append("?");
else
url.append("&");
url.append("username=");
url.append(ResponseUtils.filter(subscription.getUser().getUsername()));
url.append("&host=");
url.append(ResponseUtils.filter(subscription.getHost()));
// Generate the hyperlink start element
HttpServletResponse response =
(HttpServletResponse) pageContext.getResponse();
StringBuffer results = new StringBuffer("<a href=\"");
results.append(response.encodeURL(url.toString()));
results.append("\">");
// Print this element to our output writer
JspWriter writer = pageContext.getOut();
try {
writer.print(results.toString());
} catch (IOException e) {
throw new JspException
(messages.getMessage("linkSubscription.io", e.toString()));
}
// Evaluate the body of this tag
return (EVAL_BODY_INCLUDE);
}
/**
* Render the end of the hyperlink.
*
* @exception JspException if a JSP exception has occurred
*/
public int doEndTag() throws JspException {
// Print the ending element to our output writer
JspWriter writer = pageContext.getOut();
try {
writer.print("</a>");
} catch (IOException e) {
throw new JspException
(messages.getMessage("link.io", e.toString()));
}
return (EVAL_PAGE);
}
/**
* Release any acquired resources.
*/
public void release() {
super.release();
this.page = null;
this.name = "subscription";
}
}
|
