Top Description Fields Constructors Methods
org.eclipse.jgit.internal.storage.io

public Class CancellableDigestOutputStream

extends OutputStream
Class Inheritance
Known Direct Subclasses
org.eclipse.jgit.internal.storage.pack.PackOutputStream
Imports
org.eclipse.jgit.lib.Constants, .ProgressMonitor, java.io.IOException, .InterruptedIOException, .OutputStream, java.security.MessageDigest

An OutputStream that keeps a digest and checks every N bytes for cancellation.

Field Summary

Modifier and TypeField and Description
public static final int
BYTES_TO_WRITE_BEFORE_CANCEL_CHECK

The OutputStream checks every this value for cancellation

private long
private long
private final MessageDigest
private final OutputStream
private final ProgressMonitor

Constructor Summary

AccessConstructor and Description
public
CancellableDigestOutputStream(ProgressMonitor
monitor to update on output progress and check cancel.
writeMonitor
,
OutputStream
target stream to receive all contents.
out
)

Initialize a CancellableDigestOutputStream.

Method Summary

Modifier and TypeMethod and Description
public void
flush()

Overrides java.io.OutputStream.flush.

Implements java.io.Flushable.flush.

Flushes this output stream and forces any buffered output bytes to be written out.

public final byte[]

Returns:

SHA-1 digest
getDigest
()

Obtain the current SHA-1 digest.

public final ProgressMonitor

Returns:

the monitor
getWriteMonitor
()

Get the monitor which is used to update on output progress and check cancel.

public final long

Returns:

total number of bytes written since stream start.
length
()

Get total number of bytes written since stream start.

public final void
write(int
the byte.
b
)

Implements abstract java.io.OutputStream.write.

Writes the specified byte to this output stream.

public final void
write(byte[]
the data.
b
,
int
the start offset in the data.
off
,
int
the number of bytes to write.
len
)

Overrides java.io.OutputStream.write.

Writes len bytes from the specified byte array starting at offset off to this output stream.

Inherited from java.io.OutputStream:
closenullOutputStreamwrite

Field Detail

BYTES_TO_WRITE_BEFORE_CANCEL_CHECKback to summary
public static final int BYTES_TO_WRITE_BEFORE_CANCEL_CHECK

The OutputStream checks every this value for cancellation

checkCancelAtback to summary
private long checkCancelAt
countback to summary
private long count
mdback to summary
private final MessageDigest md
outback to summary
private final OutputStream out
writeMonitorback to summary
private final ProgressMonitor writeMonitor

Constructor Detail

CancellableDigestOutputStreamback to summary
public CancellableDigestOutputStream(ProgressMonitor writeMonitor, OutputStream out)

Initialize a CancellableDigestOutputStream.

Parameters
writeMonitor:ProgressMonitor

monitor to update on output progress and check cancel.

out:OutputStream

target stream to receive all contents.

Method Detail

flushback to summary
public void flush() throws IOException

Overrides java.io.OutputStream.flush.

Implements java.io.Flushable.flush.

Doc from java.io.OutputStream.flush.

Flushes this output stream and forces any buffered output bytes to be written out. The general contract of flush is that calling it is an indication that, if any bytes previously written have been buffered by the implementation of the output stream, such bytes should immediately be written to their intended destination.

If the intended destination of this stream is an abstraction provided by the underlying operating system, for example a file, then flushing the stream guarantees only that bytes previously written to the stream are passed to the operating system for writing; it does not guarantee that they are actually written to a physical device such as a disk drive.

Annotations
@Override
Exceptions
IOException:
if an I/O error occurs.
getDigestback to summary
public final byte[] getDigest()

Obtain the current SHA-1 digest.

Returns:byte[]

SHA-1 digest

getWriteMonitorback to summary
public final ProgressMonitor getWriteMonitor()

Get the monitor which is used to update on output progress and check cancel.

Returns:ProgressMonitor

the monitor

lengthback to summary
public final long length()

Get total number of bytes written since stream start.

Returns:long

total number of bytes written since stream start.

writeback to summary
public final void write(int b) throws IOException

Implements abstract java.io.OutputStream.write.

Doc from java.io.OutputStream.write.

Writes the specified byte to this output stream. The general contract for write is that one byte is written to the output stream. The byte to be written is the eight low-order bits of the argument b. The 24 high-order bits of b are ignored.

Parameters
b:int

the byte.

Annotations
@Override
Exceptions
IOException:
if an I/O error occurs. In particular, an IOException may be thrown if the output stream has been closed.
writeback to summary
public final void write(byte[] b, int off, int len) throws IOException

Overrides java.io.OutputStream.write.

Doc from java.io.OutputStream.write.

Writes len bytes from the specified byte array starting at offset off to this output stream. The general contract for write(b, off, len) is that some of the bytes in the array b are written to the output stream in order; element b[off] is the first byte written and b[off+len-1] is the last byte written by this operation.

If b is null, a NullPointerException is thrown.

If off is negative, or len is negative, or off+len is greater than the length of the array b, then an IndexOutOfBoundsException is thrown.

Parameters
b:byte[]

the data.

off:int

the start offset in the data.

len:int

the number of bytes to write.

Annotations
@Override
Exceptions
IOException:
if an I/O error occurs. In particular, an IOException is thrown if the output stream is closed.