org.ka2ddo.yaac.io
Class NonshareableByteArrayOutputStream

java.lang.Object
  extended by java.io.OutputStream
      extended by org.ka2ddo.yaac.io.NonshareableByteArrayOutputStream
All Implemented Interfaces:
java.io.Closeable, java.io.Flushable

public class NonshareableByteArrayOutputStream
extends java.io.OutputStream

This class is a stripped-down version of the JRE's ByteArrayOutputStream, which allows direct access to the underlying byte array instead of making copies, is not synchronized (for speed), and doesn't do String conversions.


Field Summary
protected  byte[] buf
          The buffer where data is stored.
protected  int count
          The number of valid bytes in the buffer.
 
Constructor Summary
NonshareableByteArrayOutputStream(int size)
          Creates a new byte array output stream, with a buffer capacity of the specified size, in bytes.
 
Method Summary
 void close()
          Closing a ByteArrayOutputStream has no effect.
 byte[] getByteArray()
          Returns a reference to the current contents of this output stream; bytes at or past the index == size() are undefined.
 void reset()
          Resets the count field of this byte array output stream to zero, so that all currently accumulated output in the output stream is discarded.
 int size()
          Returns the current usage of the buffer.
 void write(byte[] b, int off, int len)
          Writes len bytes from the specified byte array starting at offset off to this byte array output stream.
 void write(int b)
          Writes the specified byte to this byte array output stream.
 void writeTo(java.io.OutputStream out)
          Writes the complete contents of this byte array output stream to the specified output stream argument, as if by calling the output stream's write method using out.write(buf, 0, count).
 
Methods inherited from class java.io.OutputStream
flush, write
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

buf

protected byte[] buf
The buffer where data is stored.


count

protected int count
The number of valid bytes in the buffer.

Constructor Detail

NonshareableByteArrayOutputStream

public NonshareableByteArrayOutputStream(int size)
Creates a new byte array output stream, with a buffer capacity of the specified size, in bytes.

Parameters:
size - the initial size.
Throws:
java.lang.IllegalArgumentException - if size is negative.
Method Detail

write

public void write(int b)
Writes the specified byte to this byte array output stream.

Specified by:
write in class java.io.OutputStream
Parameters:
b - the byte to be written.

write

public void write(byte[] b,
                  int off,
                  int len)
Writes len bytes from the specified byte array starting at offset off to this byte array output stream.

Overrides:
write in class java.io.OutputStream
Parameters:
b - the data.
off - the start offset in the data.
len - the number of bytes to write.

writeTo

public void writeTo(java.io.OutputStream out)
             throws java.io.IOException
Writes the complete contents of this byte array output stream to the specified output stream argument, as if by calling the output stream's write method using out.write(buf, 0, count).

Parameters:
out - the output stream to which to write the data.
Throws:
java.io.IOException - if an I/O error occurs.

reset

public void reset()
Resets the count field of this byte array output stream to zero, so that all currently accumulated output in the output stream is discarded. The output stream can be used again, reusing the already allocated buffer space.


getByteArray

public byte[] getByteArray()
Returns a reference to the current contents of this output stream; bytes at or past the index == size() are undefined.

Returns:
the current contents of this output stream, as a byte array.
See Also:
size()

size

public int size()
Returns the current usage of the buffer. Note this can be less than the actual internal array size, as the array is expanded in chunks to minimize heap thrashing.

Returns:
the value of the count field, which is the number of valid bytes in this output stream.

close

public void close()
           throws java.io.IOException
Closing a ByteArrayOutputStream has no effect. The methods in this class can be called after the stream has been closed without generating an IOException.

Specified by:
close in interface java.io.Closeable
Overrides:
close in class java.io.OutputStream
Throws:
java.io.IOException