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29 * The class implements a buffered output stream. By setting up such
30 * an output stream, an application can write bytes to the underlying
31 * output stream without necessarily causing a call to the underlying
32 * system for each byte written.
34 * @author Arthur van Hoff
38 class BufferedOutputStream extends FilterOutputStream {
40 * The internal buffer where data is stored.
45 * The number of valid bytes in the buffer. This value is always
46 * in the range <tt>0</tt> through <tt>buf.length</tt>; elements
47 * <tt>buf[0]</tt> through <tt>buf[count-1]</tt> contain valid
53 * Creates a new buffered output stream to write data to the
54 * specified underlying output stream.
56 * @param out the underlying output stream.
58 public BufferedOutputStream(OutputStream out) {
63 * Creates a new buffered output stream to write data to the
64 * specified underlying output stream with the specified buffer
67 * @param out the underlying output stream.
68 * @param size the buffer size.
69 * @exception IllegalArgumentException if size <= 0.
71 public BufferedOutputStream(OutputStream out, int size) {
74 throw new IllegalArgumentException("Buffer size <= 0");
79 /** Flush the internal buffer */
80 private void flushBuffer() throws IOException {
82 out.write(buf, 0, count);
88 * Writes the specified byte to this buffered output stream.
90 * @param b the byte to be written.
91 * @exception IOException if an I/O error occurs.
93 public synchronized void write(int b) throws IOException {
94 if (count >= buf.length) {
97 buf[count++] = (byte)b;
101 * Writes <code>len</code> bytes from the specified byte array
102 * starting at offset <code>off</code> to this buffered output stream.
104 * <p> Ordinarily this method stores bytes from the given array into this
105 * stream's buffer, flushing the buffer to the underlying output stream as
106 * needed. If the requested length is at least as large as this stream's
107 * buffer, however, then this method will flush the buffer and write the
108 * bytes directly to the underlying output stream. Thus redundant
109 * <code>BufferedOutputStream</code>s will not copy data unnecessarily.
112 * @param off the start offset in the data.
113 * @param len the number of bytes to write.
114 * @exception IOException if an I/O error occurs.
116 public synchronized void write(byte b[], int off, int len) throws IOException {
117 if (len >= buf.length) {
118 /* If the request length exceeds the size of the output buffer,
119 flush the output buffer and then write the data directly.
120 In this way buffered streams will cascade harmlessly. */
122 out.write(b, off, len);
125 if (len > buf.length - count) {
128 System.arraycopy(b, off, buf, count, len);
133 * Flushes this buffered output stream. This forces any buffered
134 * output bytes to be written out to the underlying output stream.
136 * @exception IOException if an I/O error occurs.
137 * @see java.io.FilterOutputStream#out
139 public synchronized void flush() throws IOException {