/*
* Copyright 2005 Joe Walker
*
* 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.directwebremoting.dwrp;
import java.io.IOException;
import javax.servlet.http.HttpServletResponse;
import org.directwebremoting.ConversionException;
import org.directwebremoting.ScriptBuffer;
import org.directwebremoting.extend.ConverterManager;
import org.directwebremoting.extend.ProtocolConstants;
import org.directwebremoting.extend.ScriptBufferUtil;
import org.directwebremoting.extend.Sleeper;
import org.directwebremoting.util.MimeConstants;
/**
* A ScriptConduit for use with plain Javascript output.
* <p>Scripts are plain Javascript without 'execute-in-parent-context' wrapping,
* but with script-start and script-end markers.
* <p>If this conduit is used the client should direct the output to an iframe
* and then poll, looking for new data into the iframe. The html tags should be
* removed and script between script-start and script-end tags eval()ed.
* <p>This conduit is useful for Firefox. It will not work as it stands with IE
* 6/6 because they don't allow the browser to see data entering an iframe until
* it overflows a 4k buffer. See the {@link Html4kScriptConduit} for a version
* that works around this problem.
* @author Joe Walker [joe at getahead dot ltd dot uk]
*/
public class PlainScriptConduit extends BaseScriptConduit
{
/**
* Simple ctor
* @param response Used to flush output
* @param batchId The id of the batch that we are responding to
* @param converterManager How we convert objects to script
* @throws IOException If stream actions fail
*/
public PlainScriptConduit(Sleeper sleeper, HttpServletResponse response, String batchId, ConverterManager converterManager, boolean jsonOutput) throws IOException
{
super(sleeper, response, batchId, converterManager, jsonOutput);
}
/* (non-Javadoc)
* @see org.directwebremoting.dwrp.BaseScriptConduit#preStreamSetup()
*/
@Override
protected String getOutboundMimeType()
{
return MimeConstants.MIME_JS;
}
/* (non-Javadoc)
* @see org.directwebremoting.dwrp.BaseScriptConduit#beginStream()
*/
@Override
public void beginStream()
{
}
/* (non-Javadoc)
* @see org.directwebremoting.dwrp.BaseScriptConduit#endStream()
*/
@Override
public void endStream()
{
}
/* (non-Javadoc)
* @see org.directwebremoting.ScriptConduit#addScript(org.directwebremoting.ScriptBuffer)
*/
@Override
public boolean addScript(ScriptBuffer scriptBuffer) throws IOException, ConversionException
{
String script = ScriptBufferUtil.createOutput(scriptBuffer, converterManager, jsonOutput);
synchronized (out)
{
out.println(ProtocolConstants.SCRIPT_START_MARKER);
out.println(script);
out.println(ProtocolConstants.SCRIPT_END_MARKER);
return flush();
}
}
}