CheckedInputStream
public
class
CheckedInputStream
extends FilterInputStream
An input stream that also maintains a checksum of the data being read.
The checksum can then be used to verify the integrity of the input data.
Summary
Public methods |
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Checksum
|
getChecksum()
Returns the Checksum for this input stream.
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int
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read()
Reads a byte.
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int
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read(byte[] buf, int off, int len)
Reads into an array of bytes.
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long
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skip(long n)
Skips specified number of bytes of input.
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Inherited methods |
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From class
java.io.FilterInputStream
int
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available()
Returns an estimate of the number of bytes that can be read (or
skipped over) from this input stream without blocking by the next
caller of a method for this input stream.
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void
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close()
Closes this input stream and releases any system resources
associated with the stream.
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void
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mark(int readlimit)
Marks the current position in this input stream.
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boolean
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markSupported()
Tests if this input stream supports the mark
and reset methods.
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int
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read()
Reads the next byte of data from this input stream.
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int
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read(byte[] b, int off, int len)
Reads up to len bytes of data from this input stream
into an array of bytes.
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int
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read(byte[] b)
Reads up to byte.length bytes of data from this
input stream into an array of bytes.
|
void
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reset()
Repositions this stream to the position at the time the
mark method was last called on this input stream.
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long
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skip(long n)
Skips over and discards n bytes of data from the
input stream.
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From class
java.io.InputStream
int
|
available()
Returns an estimate of the number of bytes that can be read (or
skipped over) from this input stream without blocking by the next
invocation of a method for this input stream.
|
void
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close()
Closes this input stream and releases any system resources associated
with the stream.
|
void
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mark(int readlimit)
Marks the current position in this input stream.
|
boolean
|
markSupported()
Tests if this input stream supports the mark and
reset methods.
|
abstract
int
|
read()
Reads the next byte of data from the input stream.
|
int
|
read(byte[] b, int off, int len)
Reads up to len bytes of data from the input stream into
an array of bytes.
|
int
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read(byte[] b)
Reads some number of bytes from the input stream and stores them into
the buffer array b.
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void
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reset()
Repositions this stream to the position at the time the
mark method was last called on this input stream.
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long
|
skip(long n)
Skips over and discards n bytes of data from this input
stream.
|
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From class
java.lang.Object
Object
|
clone()
Creates and returns a copy of this object.
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boolean
|
equals(Object obj)
Indicates whether some other object is "equal to" this one.
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void
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finalize()
Called by the garbage collector on an object when garbage collection
determines that there are no more references to the object.
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final
Class<?>
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getClass()
Returns the runtime class of this Object.
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int
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hashCode()
Returns a hash code value for the object.
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final
void
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notify()
Wakes up a single thread that is waiting on this object's
monitor.
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final
void
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notifyAll()
Wakes up all threads that are waiting on this object's monitor.
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String
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toString()
Returns a string representation of the object.
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final
void
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wait(long timeout, int nanos)
Causes the current thread to wait until another thread invokes the
notify() method or the
notifyAll() method for this object, or
some other thread interrupts the current thread, or a certain
amount of real time has elapsed.
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final
void
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wait(long timeout)
Causes the current thread to wait until either another thread invokes the
notify() method or the
notifyAll() method for this object, or a
specified amount of time has elapsed.
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final
void
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wait()
Causes the current thread to wait until another thread invokes the
notify() method or the
notifyAll() method for this object.
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From interface
java.io.Closeable
abstract
void
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close()
Closes this stream and releases any system resources associated
with it.
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Public constructors
public CheckedInputStream (InputStream in,
Checksum cksum)
Creates an input stream using the specified Checksum.
| Parameters |
|---|
in |
InputStream: the input stream |
cksum |
Checksum: the Checksum |
Public methods
getChecksum
public Checksum getChecksum ()
Returns the Checksum for this input stream.
read
public int read ()
Reads a byte. Will block if no input is available.
| Returns |
|---|
int |
the byte read, or -1 if the end of the stream is reached. |
read
public int read (byte[] buf,
int off,
int len)
Reads into an array of bytes. If len is not zero, the method
blocks until some input is available; otherwise, no
bytes are read and 0 is returned.
| Parameters |
|---|
buf |
byte: the buffer into which the data is read |
off |
int: the start offset in the destination array b |
len |
int: the maximum number of bytes read |
| Returns |
|---|
int |
the actual number of bytes read, or -1 if the end
of the stream is reached. |
skip
public long skip (long n)
Skips specified number of bytes of input.
| Parameters |
|---|
n |
long: the number of bytes to skip |
| Returns |
|---|
long |
the actual number of bytes skipped |
Developers