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| 1 | /* | ||
| 2 | * Copyright (c) 1994, 2003, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package java.io; | ||
| 27 | |||
| 28 | /** | ||
| 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. | ||
| 33 | * | ||
| 34 | * @author Arthur van Hoff | ||
| 35 | * @since JDK1.0 | ||
| 36 | */ | ||
| 37 | public | ||
| 38 | class BufferedOutputStream extends FilterOutputStream { | ||
| 39 | /** | ||
| 40 | * The internal buffer where data is stored. | ||
| 41 | */ | ||
| 42 | protected byte buf[]; | ||
| 43 | |||
| 44 | /** | ||
| 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 | ||
| 48 | * byte data. | ||
| 49 | */ | ||
| 50 | protected int count; | ||
| 51 | |||
| 52 | /** | ||
| 53 | * Creates a new buffered output stream to write data to the | ||
| 54 | * specified underlying output stream. | ||
| 55 | * | ||
| 56 | * @param out the underlying output stream. | ||
| 57 | */ | ||
| 58 | public BufferedOutputStream(OutputStream out) { | ||
| 59 | this(out, 8192); | ||
| 60 | } | ||
| 61 | |||
| 62 | /** | ||
| 63 | * Creates a new buffered output stream to write data to the | ||
| 64 | * specified underlying output stream with the specified buffer | ||
| 65 | * size. | ||
| 66 | * | ||
| 67 | * @param out the underlying output stream. | ||
| 68 | * @param size the buffer size. | ||
| 69 | * @exception IllegalArgumentException if size <= 0. | ||
| 70 | */ | ||
| 71 | public BufferedOutputStream(OutputStream out, int size) { | ||
| 72 | super(out); | ||
| 73 | if (size <= 0) { | ||
| 74 | throw new IllegalArgumentException("Buffer size <= 0"); | ||
| 75 | } | ||
| 76 | buf = new byte[size]; | ||
| 77 | } | ||
| 78 | |||
| 79 | /** Flush the internal buffer */ | ||
| 80 | private void flushBuffer() throws IOException { | ||
| 81 | if (count > 0) { | ||
| 82 | out.write(buf, 0, count); | ||
| 83 | count = 0; | ||
| 84 | } | ||
| 85 | } | ||
| 86 | |||
| 87 | /** | ||
| 88 | * Writes the specified byte to this buffered output stream. | ||
| 89 | * | ||
| 90 | * @param b the byte to be written. | ||
| 91 | * @exception IOException if an I/O error occurs. | ||
| 92 | */ | ||
| 93 | public synchronized void write(int b) throws IOException { | ||
| 94 | if (count >= buf.length) { | ||
| 95 | flushBuffer(); | ||
| 96 | } | ||
| 97 | buf[count++] = (byte)b; | ||
| 98 | } | ||
| 99 | |||
| 100 | /** | ||
| 101 | * Writes <code>len</code> bytes from the specified byte array | ||
| 102 | * starting at offset <code>off</code> to this buffered output stream. | ||
| 103 | * | ||
| 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. | ||
| 110 | * | ||
| 111 | * @param b the data. | ||
| 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. | ||
| 115 | */ | ||
| 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. */ | ||
| 121 | flushBuffer(); | ||
| 122 | out.write(b, off, len); | ||
| 123 | return; | ||
| 124 | } | ||
| 125 | if (len > buf.length - count) { | ||
| 126 | flushBuffer(); | ||
| 127 | } | ||
| 128 | System.arraycopy(b, off, buf, count, len); | ||
| 129 | count += len; | ||
| 130 | } | ||
| 131 | |||
| 132 | /** | ||
| 133 | * Flushes this buffered output stream. This forces any buffered | ||
| 134 | * output bytes to be written out to the underlying output stream. | ||
| 135 | * | ||
| 136 | * @exception IOException if an I/O error occurs. | ||
| 137 | * @see java.io.FilterOutputStream#out | ||
| 138 | */ | ||
| 139 | public synchronized void flush() throws IOException { | ||
| 140 | flushBuffer(); | ||
| 141 | out.flush(); | ||
| 142 | } | ||
| 143 | } | ||