Class Overview
The CheckedOutputStream class is used to maintain a running checksum
of all data written to a stream. The purpose of this checksum is to establish
data integrity, by publishing the checksum to other parties wanting to read
the non corrupted data.
Summary
| Public Methods |
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Checksum
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getChecksum()
Returns the checksum calculated on the stream read so far.
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void
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write(byte[] buf, int off, int nbytes)
Writes n bytes of data from buf starting at offset off to
the underlying stream.
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void
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write(int val)
Writes the specified byte to the underlying stream.
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[Expand]
Inherited Methods |
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From class
java.io.FilterOutputStream
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void
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close()
Closes this stream.
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void
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flush()
Ensures that all pending data is sent out to the target stream.
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void
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write(byte[] buffer, int offset, int length)
Writes count bytes from the byte array buffer starting at
offset to the target stream.
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void
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write(int oneByte)
Writes one byte to the target stream.
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From class
java.io.OutputStream
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void
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close()
Closes this stream.
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void
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flush()
Flushes this stream.
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void
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write(byte[] buffer, int offset, int count)
Writes count bytes from the byte array buffer starting at
position offset to this stream.
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void
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write(byte[] buffer)
Equivalent to write(buffer, 0, buffer.length).
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abstract
void
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write(int oneByte)
Writes a single byte to this stream.
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From class
java.lang.Object
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Object
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clone()
Creates and returns a copy of this Object.
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boolean
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equals(Object o)
Compares this instance with the specified object and indicates if they
are equal.
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void
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finalize()
Invoked when the garbage collector has detected that this instance is no longer reachable.
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final
Class<?>
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getClass()
Returns the unique instance of Class that represents this
object's class. |
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int
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hashCode()
Returns an integer hash code for this object.
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final
void
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notify()
Causes a thread which is waiting on this object's monitor (by means of
calling one of the wait() methods) to be woken up.
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final
void
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notifyAll()
Causes all threads which are waiting on this object's monitor (by means
of calling one of the wait() methods) to be woken up.
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String
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toString()
Returns a string containing a concise, human-readable description of this
object.
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final
void
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wait()
Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object.
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final
void
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wait(long millis, int nanos)
Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the
specified timeout expires.
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final
void
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wait(long millis)
Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the
specified timeout expires.
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From interface
java.io.Closeable
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abstract
void
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close()
Closes the object and release any system resources it holds.
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From interface
java.io.Flushable
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abstract
void
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flush()
Flushes the object by writing out any buffered data to the underlying
output.
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Public Constructors
Constructs a new CheckedOutputStream on OutputStream
os. The checksum is calculated using the algorithm implemented
by csum.
Parameters
| os
| the output stream to calculate checksum for. |
| cs
| an entity implementing the checksum algorithm.
|
Public Methods
public
Checksum
getChecksum
()
Returns the checksum calculated on the stream read so far.
public
void
write
(byte[] buf, int off, int nbytes)
Writes n bytes of data from buf starting at offset off to
the underlying stream. The checksum is updated with the bytes written.
Parameters
| buf
| data written to the output stream. |
| off
| the offset to start reading the data from buf written
to the output stream. |
| nbytes
| number of bytes to write to the output stream. |
public
void
write
(int val)
Writes the specified byte to the underlying stream. The checksum is
updated with val.
Parameters
| val
| the data value to written to the output stream. |
