jakarta.mail.internet.PreencodedMimeBodyPart Maven / Gradle / Ivy
/*
* Copyright (c) 1997, 2021 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package jakarta.mail.internet;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Enumeration;
import jakarta.mail.MessagingException;
import jakarta.mail.util.LineOutputStream;
/**
* A MimeBodyPart that handles data that has already been encoded.
* This class is useful when constructing a message and attaching
* data that has already been encoded (for example, using base64
* encoding). The data may have been encoded by the application,
* or may have been stored in a file or database in encoded form.
* The encoding is supplied when this object is created. The data
* is attached to this object in the usual fashion, by using the
* setText, setContent, or
* setDataHandler methods.
*
* @since JavaMail 1.4
*/
public class PreencodedMimeBodyPart extends MimeBodyPart {
private String encoding;
/**
* Create a PreencodedMimeBodyPart that assumes the data is
* encoded using the specified encoding. The encoding must
* be a MIME supported Content-Transfer-Encoding.
*
* @param encoding the Content-Transfer-Encoding
*/
public PreencodedMimeBodyPart(String encoding) {
this.encoding = encoding;
}
/**
* Returns the content transfer encoding specified when
* this object was created.
*/
@Override
public String getEncoding() throws MessagingException {
return encoding;
}
/**
* Output the body part as an RFC 822 format stream.
*
* @exception IOException if an error occurs writing to the
* stream or if an error is generated
* by the jakarta.activation layer.
* @exception MessagingException for other failures
* @see jakarta.activation.DataHandler#writeTo
*/
@Override
public void writeTo(OutputStream os)
throws IOException, MessagingException {
// see if we already have a LOS
LineOutputStream los = null;
if (os instanceof LineOutputStream) {
los = (LineOutputStream) os;
} else {
los = streamProvider.outputLineStream(os, false);
}
// First, write out the header
Enumeration hdrLines = getAllHeaderLines();
while (hdrLines.hasMoreElements())
los.writeln(hdrLines.nextElement());
// The CRLF separator between header and content
los.writeln();
// Finally, the content, already encoded.
getDataHandler().writeTo(os);
os.flush();
}
/**
* Force the Content-Transfer-Encoding header to use
* the encoding that was specified when this object was created.
*/
@Override
protected void updateHeaders() throws MessagingException {
super.updateHeaders();
MimeBodyPart.setEncoding(this, encoding);
}
}