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My first initial commit with all of mine experimental changes.

Dmitry Kabak (userdima committed 13 years ago

Commit d37b88d1 parent 3f5b46618352 files · +2598093 −-8690Browse files

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java/pkg/java/io/BufferedOutputStream.java+143−0
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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 &lt;= 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+}