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org.directwebremoting.extend.DataUrlDownloadManager Maven / Gradle / Ivy

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.
 * 

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:"); } }





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