java.io
Class BufferedInputStream

java.lang.Object
  extended by java.io.InputStream
      extended by java.io.BufferedInputStream

public class BufferedInputStream
extends InputStream

Since:
BlackBerry API [New]

Constructor Summary
BufferedInputStream(InputStream in)
           
 
Method Summary
 void close()
          Closes this input stream and releases any system resources associated with the stream.
 int read()
          Reads the next byte of data from the input stream.
 int read(byte[] data, int offset, int length)
          Reads up to len bytes of data from the input stream into an array of bytes.
 long skip(long length)
          Skips over and discards n bytes of data from this input stream.
 
Methods inherited from class java.io.InputStream
available, mark, markSupported, read, reset
 
Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 



Constructor Detail

BufferedInputStream

public BufferedInputStream(InputStream in)
Since:
BlackBerry API [New]


Method Detail

read

public int read()
         throws IOException
Description copied from class: InputStream
Reads the next byte of data from the input stream. The value byte is returned as an 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 method blocks until input data is available, the end of the stream is detected, or an exception is thrown.

A subclass must provide an implementation of this method.

Specified by:
read in class InputStream
Returns:
the next byte of data, or -1 if the end of the stream is reached.
Throws:
IOException - if an I/O error occurs.
Since:
BlackBerry API [New]

read

public int read(byte[] data,
                int offset,
                int length)
         throws IOException
Description copied from class: InputStream
Reads up to len bytes of data from the input stream into an array of bytes. An attempt is made to read as many as len bytes, but a smaller number may be read, possibly zero. The number of bytes actually read is returned as an integer.

This method blocks until input data is available, end of file is detected, or an exception is thrown.

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.

If len is zero, then no bytes are read and 0 is returned; otherwise, there is an attempt to read at least one byte. If no byte is available because the stream is at end of file, the value -1 is returned; otherwise, at least one byte is read and stored into b.

The first byte read is stored into element b[off], the next one into b[off+1], and so on. The number of bytes read is, at most, equal to len. Let k be the number of bytes actually read; these bytes will be stored in elements b[off] through b[off+k-1], leaving elements b[off+k] through b[off+len-1] unaffected.

In every case, elements b[0] through b[off] and elements b[off+len] through b[b.length-1] are unaffected.

If the first byte cannot be read for any reason other than end of file, then an IOException is thrown. In particular, an IOException is thrown if the input stream has been closed.

The read(b, off, len) method for class InputStream simply calls the method read() repeatedly. If the first such call results in an IOException, that exception is returned from the call to the read(b, off, len) method. If any subsequent call to read() results in a IOException, the exception is caught and treated as if it were end of file; the bytes read up to that point are stored into b and the number of bytes read before the exception occurred is returned. Subclasses are encouraged to provide a more efficient implementation of this method.

Overrides:
read in class InputStream
Parameters:
data - the buffer into which the data is read.
offset - the start offset in array b at which the data is written.
length - the maximum number of bytes to read.
Returns:
the total number of bytes read into the buffer, or -1 if there is no more data because the end of the stream has been reached.
Throws:
IOException - if an I/O error occurs.
See Also:
InputStream.read()
Since:
BlackBerry API [New]

close

public void close()
           throws IOException
Description copied from class: InputStream
Closes this input stream and releases any system resources associated with the stream.

The close method of InputStream does nothing.

Overrides:
close in class InputStream
Throws:
IOException - if an I/O error occurs.
Since:
BlackBerry API [New]

skip

public long skip(long length)
          throws IOException
Description copied from class: InputStream
Skips over and discards n bytes of data from this input stream. The skip method may, for a variety of reasons, end up skipping over some smaller number of bytes, possibly 0. This may result from any of a number of conditions; reaching end of file before n bytes have been skipped is only one possibility. The actual number of bytes skipped is returned. If n is negative, no bytes are skipped.

The skip method of InputStream creates a byte array and then repeatedly reads into it until n bytes have been read or the end of the stream has been reached. Subclasses are encouraged to provide a more efficient implementation of this method.

Overrides:
skip in class InputStream
Parameters:
length - the number of bytes to be skipped.
Returns:
the actual number of bytes skipped.
Throws:
IOException - if an I/O error occurs.
Since:
BlackBerry API [New]





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