/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 javax.mail.internet;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.UnknownServiceException;
import javax.activation.DataSource;
import javax.mail.MessageAware;
import javax.mail.MessageContext;
import javax.mail.MessagingException;
/**
* @version $Rev: 702432 $ $Date: 2008-10-07 07:18:08 -0400 (Tue, 07 Oct 2008) $
*/
public class MimePartDataSource implements DataSource, MessageAware {
// the part that provides the data form this data source.
protected MimePart part;
public MimePartDataSource(MimePart part) {
this.part = part;
}
public InputStream getInputStream() throws IOException {
try {
InputStream stream;
if (part instanceof MimeMessage) {
stream = ((MimeMessage) part).getContentStream();
} else if (part instanceof MimeBodyPart) {
stream = ((MimeBodyPart) part).getContentStream();
} else {
throw new MessagingException("Unknown part");
}
return checkPartEncoding(part, stream);
} catch (MessagingException e) {
throw (IOException) new IOException(e.getMessage()).initCause(e);
}
}
/**
* For a given part, decide it the data stream requires
* wrappering with a stream for decoding a particular
* encoding.
*
* @param part The part we're extracting.
* @param stream The raw input stream for the part.
*
* @return An input stream configured for reading the
* source part and decoding it into raw bytes.
*/
private InputStream checkPartEncoding(MimePart part, InputStream stream) throws MessagingException {
String encoding = part.getEncoding();
// if nothing is specified, there's nothing to do
if (encoding == null) {
return stream;
}
// now screen out the ones that never need decoding
encoding = encoding.toLowerCase();
if (encoding.equals("7bit") || encoding.equals("8bit") || encoding.equals("binary")) {
return stream;
}
// now we need to check the content type to prevent
// MultiPart types from getting decoded, since the part is just an envelope around other
// parts
String contentType = part.getContentType();
if (contentType != null) {
try {
ContentType type = new ContentType(contentType);
// no decoding done here
if (type.match("multipart/*")) {
return stream;
}
} catch (ParseException e) {
// ignored....bad content type means we handle as a normal part
}
}
// ok, wrap this is a decoding stream if required
return MimeUtility.decode(stream, encoding);
}
public OutputStream getOutputStream() throws IOException {
throw new UnknownServiceException();
}
public String getContentType() {
try {
return part.getContentType();
} catch (MessagingException e) {
return null;
}
}
public String getName() {
return "";
}
public synchronized MessageContext getMessageContext() {
return new MessageContext(part);
}
}