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Java Platform 1.2 Beta 4 |
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SUMMARY: INNER | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |
java.lang.Object | +--java.io.InputStream | +--java.io.ByteArrayInputStream
ByteArrayInputStream
contains
an internal buffer that contains bytes that
may be read from the stream. An internal
counter keeps track of the next byte to
be supplied by the read
method.
StringBufferInputStream
Field Summary | |
protected byte[] | buf
An array of bytes that was provided by the creator of the stream. |
protected int | count
The index one greater than the last valid character in the input stream buffer. |
protected int | mark
The currently marked position in the stream. |
protected int | pos
The index of the next character to read from the input stream buffer. |
Constructor Summary | |
ByteArrayInputStream(byte[] buf,
int offset,
int length)
Creates ByteArrayInputStream
that uses buf as its
buffer array. |
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ByteArrayInputStream(byte[] buf)
Creates a ByteArrayInputStream
so that it uses buf as its
buffer array.
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Method Summary | |
int | available()
Returns the number of bytes that can be read from this input stream without blocking. |
void | mark(int readAheadLimit)
Set the current marked position in the stream. |
boolean | markSupported()
Tests if ByteArrayInputStream supports mark/reset. |
int | read()
Reads the next byte of data from this input stream. |
int | read(byte[] b,
int off,
int len)
Reads up to len bytes of data into an array of bytes
from this input stream.
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void | reset()
Resets the buffer to the marked position. |
long | skip(long n)
Skips n bytes of input from this input stream. |
Methods inherited from class java.io.InputStream | |
close , read |
Methods inherited from class java.lang.Object | |
clone , equals , finalize , getClass , hashCode , notify , notifyAll , toString , wait , wait , wait |
Field Detail |
protected byte[] buf
buf[0]
through buf[count-1]
are the
only bytes that can ever be read from the
stream; element buf[pos]
is
the next byte to be read.protected int pos
count
.
The next byte to be read from the input stream buffer
will be buf[pos]
.protected int mark
mark()
method.
The current buffer position is set to this point by the
reset()
method.protected int count
buf
.
It is one greater than the position of
the last byte within buf
that
can ever be read from the input stream buffer.Constructor Detail |
public ByteArrayInputStream(byte[] buf)
ByteArrayInputStream
so that it uses buf
as its
buffer array.
The buffer array is not copied.
The initial value of pos
is 0
and the initial value
of count
is the length of
buf
.
buf
- the input buffer.public ByteArrayInputStream(byte[] buf, int offset, int length)
ByteArrayInputStream
that uses buf
as its
buffer array. The initial value of pos
is offset
and the initial value
of count
is offset+len
.
The buffer array is not copied.
Note that if bytes are simply read from
the resulting input stream, elements buf[pos]
through buf[pos+len-1]
will
be read; however, if a reset
operation is performed, then bytes buf[0]
through buf[pos-1]
will then
become available for input.
buf
- the input buffer.
offset
- the offset in the buffer of the first byte to read.
length
- the maximum number of bytes to read from the buffer.Method Detail |
public int read()
int
in the range
0
to 255
. If no byte is available
because the end of the stream has been reached, the value
-1
is returned.
This read
method
cannot block.
-1
if the end of the
stream has been reached.public int read(byte[] b, int off, int len)
len
bytes of data into an array of bytes
from this input stream.
If pos
equals count
,
then -1
is returned to indicate
end of file. Otherwise, the number k
of bytes read is equal to the smaller of
len
and count-pos
.
If k
is positive, then bytes
buf[pos]
through buf[pos+k-1]
are copied into b[off]
through
b[off+k-1]
in the manner performed
by System.arraycopy
. The
value k
is added into pos
and k
is returned.
This read
method cannot block.
b
- the buffer into which the data is read.
off
- the start offset of the data.
len
- the maximum number of bytes read.-1
if there is no more data because the end of
the stream has been reached.public long skip(long n)
n
bytes of input from this input stream. Fewer
bytes might be skipped if the end of the input stream is reached.
The actual number k
of bytes to be skipped is equal to the smaller
of n
and count-pos
.
The value k
is added into pos
and k
is returned.
n
- the number of bytes to be skipped.public int available()
count - pos
,
which is the number of bytes remaining to be read from the input buffer.public boolean markSupported()
public void mark(int readAheadLimit)
public void reset()
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Java Platform 1.2 Beta 4 |
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SUMMARY: INNER | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |