/*
* 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.extend;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import org.directwebremoting.io.FileTransfer;
import org.directwebremoting.io.OutputStreamLoader;
import org.directwebremoting.util.Base64;
import org.directwebremoting.util.LocalUtil;
/**
* A download manager that works my returning a data: URL so the data is
* sent directly without waiting in some store.
* <p>This method has the benefit that it works in a clustered environment
* and is quite simple. However it does not work in IE.
* @author Jose Noheda [jose dot noheda at gmail dot com]
* @author Joe Walker [joe at getahead dot ltd dot uk]
*/
public class DataUrlDownloadManager implements DownloadManager
{
/* (non-Javadoc)
* @see org.directwebremoting.extend.DownloadManager#addFile(org.directwebremoting.extend.DownloadManager.FileGenerator)
*/
public String addFileTransfer(FileTransfer transfer) throws IOException
{
OutputStreamLoader loader = null;
ByteArrayOutputStream out = null;
try
{
out = new ByteArrayOutputStream();
String mimeType = transfer.getMimeType();
loader = transfer.getOutputStreamLoader();
loader.load(out);
String base64data = new String(Base64.encodeBase64(out.toByteArray()));
return "'data:" + mimeType + ";base64," + base64data + "'";
}
finally
{
LocalUtil.close(loader);
LocalUtil.close(out);
}
}
/* (non-Javadoc)
* @see org.directwebremoting.extend.DownloadManager#getFile(java.lang.String)
*/
public FileTransfer getFileTransfer(String id)
{
throw new UnsupportedOperationException("data: URLs should not be touched with http:");
}
}