107 lines
3.4 KiB
Java
107 lines
3.4 KiB
Java
/*
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* The contents of this file are subject to the Mozilla Public License Version 1.1
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* (the "License"); you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at <http://www.mozilla.org/MPL/>.
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*
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* Software distributed under the License is distributed on an "AS IS" basis, WITHOUT
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* WARRANTY OF ANY KIND, either express or implied. See the License for the specific
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* language governing rights and limitations under the License.
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*
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* The Original Code is the Venice Web Communities System.
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*
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* The Initial Developer of the Original Code is Eric J. Bowersox <erbo@silcom.com>,
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* for Silverwrist Design Studios. Portions created by Eric J. Bowersox are
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* Copyright (C) 2001-02 Eric J. Bowersox/Silverwrist Design Studios. All Rights Reserved.
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*
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* Contributor(s):
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*/
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package com.silverwrist.venice.ui.servlet;
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import java.io.IOException;
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import java.lang.ref.SoftReference;
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import javax.servlet.ServletContext;
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import javax.servlet.http.HttpServletResponse;
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import com.silverwrist.venice.ui.*;
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import com.silverwrist.venice.ui.config.RootConfig;
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public class StyleSheetServlet extends BaseServlet
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{
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/*--------------------------------------------------------------------------------
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* Internal class for returning the stylesheet data.
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*--------------------------------------------------------------------------------
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*/
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static class StyleSheetOutput implements ContentExecute
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{
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private String data; // the data to output
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StyleSheetOutput(String data)
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{
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this.data = data;
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} // end constructor
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public void execute(RequestExec req) throws IOException
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{
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if (data!=null) // send the data
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req.sendText("text/css",data);
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else // No stylesheet present - send back an error
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req.error(HttpServletResponse.SC_NOT_FOUND,"stylesheets not enabled");
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} // end execute
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} // end class StyleSheetOutput
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/*--------------------------------------------------------------------------------
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* Attributes
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*--------------------------------------------------------------------------------
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*/
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private SoftReference ref_stylesheet = null; // reference to stylesheet data
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/*--------------------------------------------------------------------------------
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* Implementations from class BaseServlet
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*--------------------------------------------------------------------------------
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*/
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public Object process(RequestInput req)
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{
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String data = null;
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ServletContext ctxt = getServletContext();
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RootConfig config = getRootConfig(ctxt);
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if (config.usingStyleSheet())
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{ // we need to load the stylesheet data...
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synchronized (this)
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{ // see if the stylesheet data has already been loaded
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if (ref_stylesheet!=null)
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data = (String)(ref_stylesheet.get());
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if ((data==null) || config.hasStyleSheetChanged())
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{ // construct or reconstruct the stylesheet data, save a soft reference to it
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if (ref_stylesheet!=null)
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ref_stylesheet.clear();
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try
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{ // retrieve the stylesheet data
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data = config.loadStyleSheetData();
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ref_stylesheet = new SoftReference(data);
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} // end try
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catch (IOException e)
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{ // can't load the stylesheet
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data = null;
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} // end catch
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} // end if
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} // end synchronized block
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} // end if
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// else not using stylesheet data at all...
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return new StyleSheetOutput(data);
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} // end process
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} // end class StyleSheetServlet
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