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/*
* @(#)MimePartDataSource.java 1.9 02/03/27
*/
package com.sun.xml.messaging.saaj.packaging.mime.internet;
import java.io.*;
import java.net.UnknownServiceException;
import javax.activation.DataSource;
import com.sun.xml.messaging.saaj.packaging.mime.MessagingException;
/**
* A utility class that implements a DataSource out of
* a MimeBodyPart. This class is primarily meant for service providers.
*
* @author John Mani
*/
public final class MimePartDataSource implements DataSource {
private final MimeBodyPart part;
/**
* Constructor, that constructs a DataSource from a MimeBodyPart.
*/
public MimePartDataSource(MimeBodyPart part) {
this.part = part;
}
/**
* Returns an input stream from this MimeBodyPart.
*
* This method applies the appropriate transfer-decoding, based
* on the Content-Transfer-Encoding attribute of this MimeBodyPart.
* Thus the returned input stream is a decoded stream of bytes.
*
* This implementation obtains the raw content from the MimeBodyPart
* using the getContentStream() method and decodes
* it using the MimeUtility.decode() method.
*
* @return decoded input stream
*/
public InputStream getInputStream() throws IOException {
try {
InputStream is = part.getContentStream();
String encoding = part.getEncoding();
if (encoding != null)
return MimeUtility.decode(is, encoding);
else
return is;
} catch (MessagingException mex) {
throw new IOException(mex.getMessage());
}
}
/**
* DataSource method to return an output stream.
*
* This implementation throws the UnknownServiceException.
*/
public OutputStream getOutputStream() throws IOException {
throw new UnknownServiceException();
}
/**
* Returns the content-type of this DataSource.
*
* This implementation just invokes the getContentType
* method on the MimeBodyPart.
*/
public String getContentType() {
return part.getContentType();
}
/**
* DataSource method to return a name.
*
* This implementation just returns an empty string.
*/
public String getName() {
try {
return part.getFileName();
} catch (MessagingException mex) {
return "";
}
}
}