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java.lang.Objectjava.io.InputStream
java.io.ByteArrayInputStream
@TransactionType(value=NOT_SUPPORTED) public class ByteArrayInputStream
A 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.
Closing a ByteArrayInputStream has no effect. The methods in this class can be called after the stream has been closed without generating an IOException.
| 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)
Creates a ByteArrayInputStream so that it uses
buf as its buffer array. |
|
ByteArrayInputStream(byte[] buf,
int offset,
int length)
Creates ByteArrayInputStream that uses buf
as its buffer array. |
|
| Method Summary | |
|---|---|
int |
available()
Returns the number of bytes that can be read from this input stream without blocking. |
void |
close()
Closing a ByteArrayInputStream has no effect. |
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. |
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 |
|---|
read |
| Methods inherited from class java.lang.Object |
|---|
equals, 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+length. 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.
read in class InputStream-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.
read in class InputStreamb - 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.InputStream.read()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.
skip in class InputStreamn - 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.
available in class InputStreampublic boolean markSupported()
markSupported in class InputStreamtrue if this true type supports the mark and reset
method; false otherwise.InputStream.mark(int),
InputStream.reset()public void mark(int readAheadLimit)
Note: The readAheadLimit for this class
has no meaning.
mark in class InputStreamreadAheadLimit - the maximum limit of bytes that can be read before the mark
position becomes invalid.InputStream.reset()public void reset()
pos is set to 0.
reset in class InputStreamInputStream.mark(int),
IOException
public void close()
throws IOException
close in class InputStreamIOException - if an I/O error occurs.
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