- * The size of the internal buffer defaults to 32 and it is resized
- * by doubling the size of the buffer. This default size can be
- * overridden by using the
- * gnu.java.io.ByteArrayOutputStream.initialBufferSize
- * property.
- *
- * There is a constructor that specified the initial buffer size and - * that is the preferred way to set that value because it it portable - * across all Java class library implementations. - *
- * Note that this class also has methods that convert the byte array
- * buffer to a
- * This method does not convert bytes to characters in the proper way and
- * so is deprecated in favor of the other overloaded String using either the system default or an
- * application specified character encoding. Thus it can handle
- * multibyte character encodings.
- *
- * @version 0.0
- *
- * @author Aaron M. Renn (arenn@urbanophile.com)
- * @author Tom Tromey ByteArrayOutputStream
- * with the default buffer size of 32 bytes. If a different initial
- * buffer size is desired, see the constructor
- * ByteArrayOutputStream(int size). For applications
- * where the source code is not available, the default buffer size
- * can be set using the system property
- * gnu.java.io.ByteArrayOutputStream.initialBufferSize
- */
- public ByteArrayOutputStream ()
- {
- this (initial_buffer_size);
- }
-
- /**
- * This method initializes a new ByteArrayOutputStream with
- * a specified initial buffer size.
- *
- * @param size The initial buffer size in bytes
- */
- public ByteArrayOutputStream (int size)
- {
- buf = new byte[size];
- count = 0;
- }
-
- /**
- * This method discards all of the bytes that have been written to
- * the internal buffer so far by setting the count
- * variable to 0. The internal buffer remains at its currently
- * allocated size.
- */
- public synchronized void reset ()
- {
- count = 0;
- }
-
- /**
- * This method returns the number of bytes that have been written to
- * the buffer so far. This is the same as the value of the protected
- * count variable. If the reset method is
- * called, then this value is reset as well. Note that this method does
- * not return the length of the internal buffer, but only the number
- * of bytes that have been written to it.
- *
- * @return The number of bytes in the internal buffer
- *
- * @see reset
- */
- public int size ()
- {
- return count;
- }
-
- /**
- * This method returns a byte array containing the bytes that have been
- * written to this stream so far. This array is a copy of the valid
- * bytes in the internal buffer and its length is equal to the number of
- * valid bytes, not necessarily to the the length of the current
- * internal buffer. Note that since this method allocates a new array,
- * it should be used with caution when the internal buffer is very large.
- */
- public synchronized byte[] toByteArray ()
- {
- byte[] ret = new byte[count];
- System.arraycopy(buf, 0, ret, 0, count);
- return ret;
- }
-
- /**
- * Returns the bytes in the internal array as a String. The
- * bytes in the buffer are converted to characters using the system default
- * encoding. There is an overloaded toString() method that
- * allows an application specified character encoding to be used.
- *
- * @return A String containing the data written to this
- * stream so far
- */
- public String toString ()
- {
- return new String (buf, 0, count);
- }
-
- /**
- * Returns the bytes in the internal array as a String. The
- * bytes in the buffer are converted to characters using the specified
- * encoding.
- *
- * @param enc The name of the character encoding to use
- *
- * @return A String containing the data written to this
- * stream so far
- *
- * @exception UnsupportedEncodingException If the named encoding is
- * not available
- */
- public String toString (String enc) throws UnsupportedEncodingException
- {
- return new String (buf, 0, count, enc);
- }
-
- /**
- * This method returns the bytes in the internal array as a
- * String. It uses each byte in the array as the low
- * order eight bits of the Unicode character value and the passed in
- * parameter as the high eight bits.
- * toString
- * methods which use a true character encoding.
- *
- * @param hibyte The high eight bits to use for each character in
- * the String
- *
- * @return A String containing the data written to this
- * stream so far
- *
- * @deprecrated
- */
- public String toString (int hibyte)
- {
- return new String (buf, 0, count, hibyte);
- }
-
- // Resize buffer to accommodate new bytes.
- private void resize (int add)
- {
- if (count + add >= buf.length)
- {
- int newlen = buf.length * 2;
- if (count + add > newlen)
- newlen = count + add;
- byte[] newbuf = new byte[newlen];
- System.arraycopy(buf, 0, newbuf, 0, count);
- buf = newbuf;
- }
- }
-
- /**
- * This method writes the writes the specified byte into the internal
- * buffer.
- *
- * @param oneByte The byte to be read passed as an int
- */
- public synchronized void write (int oneByte)
- {
- resize (1);
- buf[count++] = (byte) oneByte;
- }
-
- /**
- * This method writes len bytes from the passed in array
- * buf starting at index offset into the
- * internal buffer.
- *
- * @param buffer The byte array to write data from
- * @param offset The index into the buffer to start writing data from
- * @param add The number of bytes to write
- */
- public synchronized void write (byte[] buffer, int offset, int add)
- {
- // If ADD < 0 then arraycopy will throw the appropriate error for
- // us.
- if (add >= 0)
- resize (add);
- System.arraycopy(buffer, offset, buf, count, add);
- count += add;
- }
-
- /**
- * This method writes all the bytes that have been written to this stream
- * from the internal buffer to the specified OutputStream.
- *
- * @param out The OutputStream to write to
- *
- * @exception IOException If an error occurs
- */
- public synchronized void writeTo (OutputStream out) throws IOException
- {
- out.write(buf, 0, count);
- }
-
- /**
- * The internal buffer where the data written is stored
- */
- protected byte[] buf;
-
- /**
- * The number of bytes that have been written to the buffer
- */
- protected int count;
-
- /**
- * The default initial buffer size. Specified by the JCL.
- */
- private static final int DEFAULT_INITIAL_BUFFER_SIZE = 32;
-
- // The default buffer size which can be overridden by the user.
- private static final int initial_buffer_size;
-
- static
- {
- int r
- = Integer.getInteger ("gnu.java.io.ByteArrayOutputStream.initialBufferSize",
- DEFAULT_INITIAL_BUFFER_SIZE).intValue ();
- if (r <= 0)
- r = DEFAULT_INITIAL_BUFFER_SIZE;
- initial_buffer_size = r;
- }
-}