public void seekRelative(long relativeOffset) throws IOException {
ensureReadyOnFirstUse();
long pos = streamDataInput.getAbsolutePosition();
pos += relativeOffset;
if (pos < filePositionOfStreamData) pos = filePositionOfStreamData;
// It's alright to seek beyond the end, it's just that read operations will fail
streamDataInput.seekAbsolute(pos);
}
private void ensureReadyOnFirstUse() throws IOException {
beginThreadAccess();
if (usedYet) return;
usedYet = true;
// System.out.println("SICW.ensureReadyOnFirstUse() About to ... " + this);
filePositionBeforeUse = streamDataInput.getAbsolutePosition();
streamDataInput.seekAbsolute(filePositionOfStreamData);
// System.out.println("SICW.ensureReadyOnFirstUse() ... Done " + this);
}
public int available()
throws IOException
{
long l = in.length() - in.tell();
if (l > 0x7fffffffL)
{
return 0x7fffffff;
} else
{
return (int)l;
}
}
public static DataFileReader openReader(SeekableInput seekableinput, DatumReader datumreader, DataFileStream.Header header, boolean flag)
throws IOException
{
datumreader = new DataFileReader(seekableinput, datumreader, header);
if (flag)
{
datumreader.sync(seekableinput.tell());
return datumreader;
} else
{
datumreader.seek(seekableinput.tell());
return datumreader;
}
}
public long skip(long n) throws IOException {
ensureReadyOnFirstUse();
long remain = getBytesRemaining();
if (remain <= 0) return -1;
n = (int) Math.min(Math.min(remain, (long) n), (long) Integer.MAX_VALUE);
return streamDataInput.skip(n);
}
//
// Methods from InputStream
// Since Java does not have multiple inheritance, we have to
// explicitly expose InputStream's methods as part of our interface
//
public int read() throws IOException {
ensureReadyOnFirstUse();
long remain = getBytesRemaining();
// System.out.println("SICW.read() remain: " + remain);
if (remain <= 0) return -1;
return streamDataInput.read();
}
public int read(byte[] buffer, int offset, int length) throws IOException {
ensureReadyOnFirstUse();
long remain = getBytesRemaining();
// System.out.println("SICW.read( "+length+" ) remain: " + remain);
if (remain <= 0) return -1;
length = (int) Math.min(Math.min(remain, (long) length), (long) Integer.MAX_VALUE);
return streamDataInput.read(buffer, offset, length);
}
private void endCurrentUse() throws IOException {
// System.out.println("SICW.endCurrentUse() About to ... " + this);
if (usedYet) {
streamDataInput.seekAbsolute(filePositionBeforeUse);
usedYet = false;
}
endThreadAccess();
// System.out.println("SICW.endCurrentUse() ... Done " + this);
}
public void seekAbsolute(long absolutePosition) throws IOException {
ensureReadyOnFirstUse();
// The wrapper exists in a different coordinate system,
// where its beginning is location 0
if (absolutePosition < 0L)
throw new IOException("Attempt to absolutely seek to negative location: " + absolutePosition);
// It's alright to seek beyond the end, it's just that read operations will fail
absolutePosition += filePositionOfStreamData;
streamDataInput.seekAbsolute(absolutePosition);
}
public void seek(long l)
throws IOException
{
if (l < 0L)
{
throw new IOException((new StringBuilder()).append("Illegal seek: ").append(l).toString());
} else
{
in.seek(l);
return;
}
}
public static FileReader openReader(SeekableInput seekableinput, DatumReader datumreader)
throws IOException
{
if (seekableinput.length() < (long)DataFileConstants.MAGIC.length)
{
throw new IOException("Not an Avro data file");
}
byte abyte0[] = new byte[DataFileConstants.MAGIC.length];
seekableinput.seek(0L);
for (int i = 0; i < abyte0.length; i = seekableinput.read(abyte0, i, abyte0.length - i)) { }
seekableinput.seek(0L);
if (Arrays.equals(DataFileConstants.MAGIC, abyte0))
{
return new DataFileReader(seekableinput, datumreader);
}
if (Arrays.equals(DataFileReader12.MAGIC, abyte0))
{
return new DataFileReader12(seekableinput, datumreader);
} else
{
throw new IOException("Not an Avro data file");
}
}
public void dispose() throws IOException {
beginThreadAccess();
// System.out.println("SICW.endFinalUse() About to ... " + this);
if (takeOwnershipOfStreamDataInput) {
if (streamDataInput != null) {
streamDataInput.close();
endThreadAccess();
streamDataInput = null;
}
} else {
endCurrentUse(); // In case using code forgot
}
// System.out.println("SICW.endFinalUse() ... Done " + this);
}
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append(super.toString());
sb.append(" ( ");
sb.append("pos=").append(filePositionOfStreamData).append(", ");
sb.append("len=").append(lengthOfStreamData).append(", ");
sb.append("posToRestore=").append(filePositionBeforeUse).append(", ");
sb.append("own=").append(takeOwnershipOfStreamDataInput).append(", ");
sb.append("usedYet=").append(usedYet);
sb.append(" ) ");
sb.append(": ");
if (streamDataInput == null) sb.append("null ");
else sb.append(streamDataInput.toString());
return sb.toString();
}
public long skip(long l)
throws IOException
{
long l1 = in.tell();
long l2 = in.length() - l1;
if (l2 > l)
{
in.seek(l);
return in.tell() - l1;
} else
{
in.seek(l2);
return in.tell() - l1;
}
}
public void endThreadAccess() {
if (streamDataInput != null) streamDataInput.endThreadAccess();
}
public void beginThreadAccess() {
if (streamDataInput != null) streamDataInput.beginThreadAccess();
}
public int read(byte abyte0[], int i, int j)
throws IOException
{
return in.read(abyte0, i, j);
}
public void close()
throws IOException
{
in.close();
super.close();
}
public long length()
throws IOException
{
return in.length();
}
private long getBytesRemaining() throws IOException {
long absPos = streamDataInput.getAbsolutePosition();
if (absPos < filePositionOfStreamData) return -1;
long end = filePositionOfStreamData + lengthOfStreamData;
return end - absPos;
}
public void seekEnd() throws IOException {
ensureReadyOnFirstUse();
streamDataInput.seekAbsolute(filePositionOfStreamData + lengthOfStreamData);
}
public long tell()
throws IOException
{
return in.tell();
}
public int read(byte abyte0[])
throws IOException
{
return in.read(abyte0, 0, abyte0.length);
}