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Posted to slide-dev@jakarta.apache.org by cm...@apache.org on 2001/12/03 16:12:37 UTC
cvs commit: jakarta-slide/src/taglib/struts/org/apache/slide/taglib/tag/struts ContentTag.java
cmlenz 01/12/03 07:12:37
Added: src/taglib/common/org/apache/slide/taglib/tag
ContentTagSupport.java
src/taglib/struts/org/apache/slide/taglib/tag/struts
ContentTag.java
Log:
Add an experimental 'content' tag that will reset the response buffers and
try to stream the content of a selected node revision to the client. This
allows the viewing of slide resources in the context of a JSP application
without having to write a servlet, or redirect to the WebdavServlet
(which might not even be deployed).
This tag should also implement the usage of Content-Range for better
performance, but for that the corresponding code in
o.a.s.webdav.method.GetMethod should be factored out into a utility class.
Revision Changes Path
1.1 jakarta-slide/src/taglib/common/org/apache/slide/taglib/tag/ContentTagSupport.java
Index: ContentTagSupport.java
===================================================================
/*
* $Header: /home/cvs/jakarta-slide/src/taglib/common/org/apache/slide/taglib/tag/ContentTagSupport.java,v 1.1 2001/12/03 15:12:36 cmlenz Exp $
* $Revision: 1.1 $
* $Date: 2001/12/03 15:12:36 $
*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999 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", "Tomcat", 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/>.
*
* [Additional notices, if required by prior licensing conditions]
*
*/
package org.apache.slide.taglib.tag;
import java.io.InputStream;
import java.io.IOException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.tagext.TagSupport;
import org.apache.slide.common.SlideException;
import org.apache.slide.taglib.bean.NodeBean;
import org.apache.slide.taglib.bean.PropertyBean;
import org.apache.slide.taglib.bean.RevisionBean;
/**
* Very simple implementation of a tag that sends the content of a revision of
* a node to the client.
*
* <p>The node and revision is chosen based on the tags the content tag is
* nested in. This tag must be used before the response is commited as HTML
* content, because the response headers and content will be reset.</p>
*
* <ul>TODO:
* <li>Support Content-Range</li>
* </ul>
*
* @author <a href="mailto:cmlenz@apache.org">Christopher Lenz</a>
* @version $Revision: 1.1 $
*/
public abstract class ContentTagSupport
extends TagSupport {
// ----------------------------------------------------- Instance Variables
/**
* The revision bean.
*/
protected RevisionBean revision;
// ----------------------------------------------------------- Construction
/**
* Initialize inherited and local state.
*/
public ContentTagSupport() {
super();
init();
}
// ------------------------------------------------------------ Tag Methods
/**
* Called by the JSP Engine when opening this tag.
*
* @throws JspException If this tag isn't nested inside a NodeTag or a
* NodeWrapper iteration
*/
public int doStartTag()
throws JspException {
super.doStartTag();
HttpServletResponse response =
(HttpServletResponse)pageContext.getResponse();
if (response.isCommitted()) {
// indicates improper use of this tag: should be used very close to
// the beginning of a JSP, not after so much output has already
// been written that part of the response has already been sent.
throw new JspException("The Slide 'content' tag has to be used " +
"before the response has been committed.");
} else {
response.resetBuffer();
}
// revision not found
if (revision == null) {
try {
response.sendError(HttpServletResponse.SC_NOT_FOUND);
return SKIP_PAGE;
} catch (IOException e) {
// ignore
}
}
// set the HTTP response headers
PropertyBean property;
property = revision.getProperty("DAV:", "getcontenttype");
if (property != null) {
response.setHeader("Content-Type", property.getValue());
}
property = revision.getProperty("DAV:", "getcontentlength");
if (property != null) {
response.setHeader("Content-Length", property.getValue());
}
property = revision.getProperty("DAV:", "lastmodified");
if (property != null) {
response.setHeader("Last-Modified", property.getValue());
}
// stream the content
ServletOutputStream os = null;
InputStream is = null;
try {
os = response.getOutputStream();
try {
is = revision.getInputStream();
} catch (SlideException e) {
System.out.println(e.getMessage());
e.printStackTrace();
}
if (is != null) {
byte buffer[] = new byte[2048];
int len = buffer.length;
while (true) {
len = is.read(buffer);
if (len == -1)
break;
os.write(buffer, 0, len);
}
}
} catch (IOException e) {
// ignore
} finally {
if (os != null) {
try {
os.flush();
} catch (Exception e) {
// ignore
}
try {
os.close();
} catch (Exception e) {
// ignore
}
}
if (is != null) {
try {
is.close();
} catch (Exception e) {
// ignore
}
}
}
return SKIP_PAGE;
}
/**
* Releases any resources we may have (or inherit).
*/
public void release() {
super.release();
init();
}
// -------------------------------------------------------- Private Methods
/**
* Reset internal state.
*/
private void init() {
revision = null;
}
}
1.1 jakarta-slide/src/taglib/struts/org/apache/slide/taglib/tag/struts/ContentTag.java
Index: ContentTag.java
===================================================================
/*
* $Header: /home/cvs/jakarta-slide/src/taglib/struts/org/apache/slide/taglib/tag/struts/ContentTag.java,v 1.1 2001/12/03 15:12:37 cmlenz Exp $
* $Revision: 1.1 $
* $Date: 2001/12/03 15:12:37 $
*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999 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", "Tomcat", 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/>.
*
* [Additional notices, if required by prior licensing conditions]
*
*/
package org.apache.slide.taglib.tag.struts;
import javax.servlet.jsp.JspException;
import org.apache.slide.taglib.bean.RevisionBean;
import org.apache.slide.taglib.tag.ContentTagSupport;
/**
* Extends the ContentTagSupport to work in a Struts environment.
*
* @author <a href="mailto:cmlenz@apache.org">Christopher Lenz</a>
* @version $Revision: 1.1 $
*/
public class ContentTag
extends ContentTagSupport {
// ------------------------------------------------------------ Tag Methods
/**
* Called by the JSP Engine when opening this tag.
*
* @throws JspException if the 'number' attribute does not contain a
* version number in a valid format
*/
public int doStartTag()
throws JspException {
System.out.println("ContentTag.doStartTag()");
RevisionBean revision =
StrutsTagUtils.findRevision(this, pageContext);
return super.doStartTag();
}
}
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