/**
* Populate this instance with what we find on the passed in <code>in</code> stream. Can
* deserialize protobuf of old Writables format.
*
* @param in
* @throws IOException
* @see #write(DataOutputStream)
*/
void read(final DataInputStream in) throws IOException {
// This code is tested over in TestHFileReaderV1 where we read an old hfile w/ this new code.
int pblen = ProtobufUtil.lengthOfPBMagic();
byte[] pbuf = new byte[pblen];
if (in.markSupported()) in.mark(pblen);
int read = in.read(pbuf);
if (read != pblen) throw new IOException("read=" + read + ", wanted=" + pblen);
if (ProtobufUtil.isPBMagicPrefix(pbuf)) {
parsePB(HFileProtos.FileInfoProto.parseDelimitedFrom(in));
} else {
if (in.markSupported()) {
in.reset();
parseWritable(in);
} else {
// We cannot use BufferedInputStream, it consumes more than we read from the underlying IS
ByteArrayInputStream bais = new ByteArrayInputStream(pbuf);
SequenceInputStream sis = new SequenceInputStream(bais, in); // Concatenate input streams
// TODO: Am I leaking anything here wrapping the passed in stream? We are not calling
// close on the wrapped
// streams but they should be let go after we leave this context? I see that we keep a
// reference to the
// passed in inputstream but since we no longer have a reference to this after we leave,
// we should be ok.
parseWritable(new DataInputStream(sis));
}
}
}
/**
* Parses an HRegionInfo instance from the passed in stream. Presumes the HRegionInfo was
* serialized to the stream with {@link #toDelimitedByteArray()}
*
* @param in
* @return An instance of HRegionInfo.
* @throws IOException
*/
public static HRegionInfo parseFrom(final DataInputStream in) throws IOException {
// I need to be able to move back in the stream if this is not a pb serialization so I can
// do the Writable decoding instead.
int pblen = ProtobufUtil.lengthOfPBMagic();
byte[] pbuf = new byte[pblen];
if (in.markSupported()) { // read it with mark()
in.mark(pblen);
}
int read =
in.read(pbuf); // assumption: if Writable serialization, it should be longer than pblen.
if (read != pblen) throw new IOException("read=" + read + ", wanted=" + pblen);
if (ProtobufUtil.isPBMagicPrefix(pbuf)) {
return convert(HBaseProtos.RegionInfo.parseDelimitedFrom(in));
} else {
// Presume Writables. Need to reset the stream since it didn't start w/ pb.
if (in.markSupported()) {
in.reset();
HRegionInfo hri = new HRegionInfo();
hri.readFields(in);
return hri;
} else {
// we cannot use BufferedInputStream, it consumes more than we read from the underlying IS
ByteArrayInputStream bais = new ByteArrayInputStream(pbuf);
SequenceInputStream sis = new SequenceInputStream(bais, in); // concatenate input streams
HRegionInfo hri = new HRegionInfo();
hri.readFields(new DataInputStream(sis));
return hri;
}
}
}
@Override
public boolean markSupported() {
return dataInput.markSupported();
}
@Override
public boolean markSupported() {
return in.markSupported();
}
