1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/emul/compact/src/main/java/java/io/ByteArrayOutputStream.java Wed Feb 06 15:07:20 2013 +0100
1.3 @@ -0,0 +1,272 @@
1.4 +/*
1.5 + * Copyright (c) 1994, 2010, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation. Oracle designates this
1.11 + * particular file as subject to the "Classpath" exception as provided
1.12 + * by Oracle in the LICENSE file that accompanied this code.
1.13 + *
1.14 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.15 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.16 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.17 + * version 2 for more details (a copy is included in the LICENSE file that
1.18 + * accompanied this code).
1.19 + *
1.20 + * You should have received a copy of the GNU General Public License version
1.21 + * 2 along with this work; if not, write to the Free Software Foundation,
1.22 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.23 + *
1.24 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.25 + * or visit www.oracle.com if you need additional information or have any
1.26 + * questions.
1.27 + */
1.28 +
1.29 +package java.io;
1.30 +
1.31 +import java.util.Arrays;
1.32 +
1.33 +/**
1.34 + * This class implements an output stream in which the data is
1.35 + * written into a byte array. The buffer automatically grows as data
1.36 + * is written to it.
1.37 + * The data can be retrieved using <code>toByteArray()</code> and
1.38 + * <code>toString()</code>.
1.39 + * <p>
1.40 + * Closing a <tt>ByteArrayOutputStream</tt> has no effect. The methods in
1.41 + * this class can be called after the stream has been closed without
1.42 + * generating an <tt>IOException</tt>.
1.43 + *
1.44 + * @author Arthur van Hoff
1.45 + * @since JDK1.0
1.46 + */
1.47 +
1.48 +public class ByteArrayOutputStream extends OutputStream {
1.49 +
1.50 + /**
1.51 + * The buffer where data is stored.
1.52 + */
1.53 + protected byte buf[];
1.54 +
1.55 + /**
1.56 + * The number of valid bytes in the buffer.
1.57 + */
1.58 + protected int count;
1.59 +
1.60 + /**
1.61 + * Creates a new byte array output stream. The buffer capacity is
1.62 + * initially 32 bytes, though its size increases if necessary.
1.63 + */
1.64 + public ByteArrayOutputStream() {
1.65 + this(32);
1.66 + }
1.67 +
1.68 + /**
1.69 + * Creates a new byte array output stream, with a buffer capacity of
1.70 + * the specified size, in bytes.
1.71 + *
1.72 + * @param size the initial size.
1.73 + * @exception IllegalArgumentException if size is negative.
1.74 + */
1.75 + public ByteArrayOutputStream(int size) {
1.76 + if (size < 0) {
1.77 + throw new IllegalArgumentException("Negative initial size: "
1.78 + + size);
1.79 + }
1.80 + buf = new byte[size];
1.81 + }
1.82 +
1.83 + /**
1.84 + * Increases the capacity if necessary to ensure that it can hold
1.85 + * at least the number of elements specified by the minimum
1.86 + * capacity argument.
1.87 + *
1.88 + * @param minCapacity the desired minimum capacity
1.89 + * @throws OutOfMemoryError if {@code minCapacity < 0}. This is
1.90 + * interpreted as a request for the unsatisfiably large capacity
1.91 + * {@code (long) Integer.MAX_VALUE + (minCapacity - Integer.MAX_VALUE)}.
1.92 + */
1.93 + private void ensureCapacity(int minCapacity) {
1.94 + // overflow-conscious code
1.95 + if (minCapacity - buf.length > 0)
1.96 + grow(minCapacity);
1.97 + }
1.98 +
1.99 + /**
1.100 + * Increases the capacity to ensure that it can hold at least the
1.101 + * number of elements specified by the minimum capacity argument.
1.102 + *
1.103 + * @param minCapacity the desired minimum capacity
1.104 + */
1.105 + private void grow(int minCapacity) {
1.106 + // overflow-conscious code
1.107 + int oldCapacity = buf.length;
1.108 + int newCapacity = oldCapacity << 1;
1.109 + if (newCapacity - minCapacity < 0)
1.110 + newCapacity = minCapacity;
1.111 + if (newCapacity < 0) {
1.112 + if (minCapacity < 0) // overflow
1.113 + throw new OutOfMemoryError();
1.114 + newCapacity = Integer.MAX_VALUE;
1.115 + }
1.116 + buf = Arrays.copyOf(buf, newCapacity);
1.117 + }
1.118 +
1.119 + /**
1.120 + * Writes the specified byte to this byte array output stream.
1.121 + *
1.122 + * @param b the byte to be written.
1.123 + */
1.124 + public synchronized void write(int b) {
1.125 + ensureCapacity(count + 1);
1.126 + buf[count] = (byte) b;
1.127 + count += 1;
1.128 + }
1.129 +
1.130 + /**
1.131 + * Writes <code>len</code> bytes from the specified byte array
1.132 + * starting at offset <code>off</code> to this byte array output stream.
1.133 + *
1.134 + * @param b the data.
1.135 + * @param off the start offset in the data.
1.136 + * @param len the number of bytes to write.
1.137 + */
1.138 + public synchronized void write(byte b[], int off, int len) {
1.139 + if ((off < 0) || (off > b.length) || (len < 0) ||
1.140 + ((off + len) - b.length > 0)) {
1.141 + throw new IndexOutOfBoundsException();
1.142 + }
1.143 + ensureCapacity(count + len);
1.144 + System.arraycopy(b, off, buf, count, len);
1.145 + count += len;
1.146 + }
1.147 +
1.148 + /**
1.149 + * Writes the complete contents of this byte array output stream to
1.150 + * the specified output stream argument, as if by calling the output
1.151 + * stream's write method using <code>out.write(buf, 0, count)</code>.
1.152 + *
1.153 + * @param out the output stream to which to write the data.
1.154 + * @exception IOException if an I/O error occurs.
1.155 + */
1.156 + public synchronized void writeTo(OutputStream out) throws IOException {
1.157 + out.write(buf, 0, count);
1.158 + }
1.159 +
1.160 + /**
1.161 + * Resets the <code>count</code> field of this byte array output
1.162 + * stream to zero, so that all currently accumulated output in the
1.163 + * output stream is discarded. The output stream can be used again,
1.164 + * reusing the already allocated buffer space.
1.165 + *
1.166 + * @see java.io.ByteArrayInputStream#count
1.167 + */
1.168 + public synchronized void reset() {
1.169 + count = 0;
1.170 + }
1.171 +
1.172 + /**
1.173 + * Creates a newly allocated byte array. Its size is the current
1.174 + * size of this output stream and the valid contents of the buffer
1.175 + * have been copied into it.
1.176 + *
1.177 + * @return the current contents of this output stream, as a byte array.
1.178 + * @see java.io.ByteArrayOutputStream#size()
1.179 + */
1.180 + public synchronized byte toByteArray()[] {
1.181 + return Arrays.copyOf(buf, count);
1.182 + }
1.183 +
1.184 + /**
1.185 + * Returns the current size of the buffer.
1.186 + *
1.187 + * @return the value of the <code>count</code> field, which is the number
1.188 + * of valid bytes in this output stream.
1.189 + * @see java.io.ByteArrayOutputStream#count
1.190 + */
1.191 + public synchronized int size() {
1.192 + return count;
1.193 + }
1.194 +
1.195 + /**
1.196 + * Converts the buffer's contents into a string decoding bytes using the
1.197 + * platform's default character set. The length of the new <tt>String</tt>
1.198 + * is a function of the character set, and hence may not be equal to the
1.199 + * size of the buffer.
1.200 + *
1.201 + * <p> This method always replaces malformed-input and unmappable-character
1.202 + * sequences with the default replacement string for the platform's
1.203 + * default character set. The {@linkplain java.nio.charset.CharsetDecoder}
1.204 + * class should be used when more control over the decoding process is
1.205 + * required.
1.206 + *
1.207 + * @return String decoded from the buffer's contents.
1.208 + * @since JDK1.1
1.209 + */
1.210 + public synchronized String toString() {
1.211 + return new String(buf, 0, count);
1.212 + }
1.213 +
1.214 + /**
1.215 + * Converts the buffer's contents into a string by decoding the bytes using
1.216 + * the specified {@link java.nio.charset.Charset charsetName}. The length of
1.217 + * the new <tt>String</tt> is a function of the charset, and hence may not be
1.218 + * equal to the length of the byte array.
1.219 + *
1.220 + * <p> This method always replaces malformed-input and unmappable-character
1.221 + * sequences with this charset's default replacement string. The {@link
1.222 + * java.nio.charset.CharsetDecoder} class should be used when more control
1.223 + * over the decoding process is required.
1.224 + *
1.225 + * @param charsetName the name of a supported
1.226 + * {@linkplain java.nio.charset.Charset </code>charset<code>}
1.227 + * @return String decoded from the buffer's contents.
1.228 + * @exception UnsupportedEncodingException
1.229 + * If the named charset is not supported
1.230 + * @since JDK1.1
1.231 + */
1.232 + public synchronized String toString(String charsetName)
1.233 + throws UnsupportedEncodingException
1.234 + {
1.235 + return new String(buf, 0, count, charsetName);
1.236 + }
1.237 +
1.238 + /**
1.239 + * Creates a newly allocated string. Its size is the current size of
1.240 + * the output stream and the valid contents of the buffer have been
1.241 + * copied into it. Each character <i>c</i> in the resulting string is
1.242 + * constructed from the corresponding element <i>b</i> in the byte
1.243 + * array such that:
1.244 + * <blockquote><pre>
1.245 + * c == (char)(((hibyte & 0xff) << 8) | (b & 0xff))
1.246 + * </pre></blockquote>
1.247 + *
1.248 + * @deprecated This method does not properly convert bytes into characters.
1.249 + * As of JDK 1.1, the preferred way to do this is via the
1.250 + * <code>toString(String enc)</code> method, which takes an encoding-name
1.251 + * argument, or the <code>toString()</code> method, which uses the
1.252 + * platform's default character encoding.
1.253 + *
1.254 + * @param hibyte the high byte of each resulting Unicode character.
1.255 + * @return the current contents of the output stream, as a string.
1.256 + * @see java.io.ByteArrayOutputStream#size()
1.257 + * @see java.io.ByteArrayOutputStream#toString(String)
1.258 + * @see java.io.ByteArrayOutputStream#toString()
1.259 + */
1.260 + @Deprecated
1.261 + public synchronized String toString(int hibyte) {
1.262 + return new String(buf, hibyte, 0, count);
1.263 + }
1.264 +
1.265 + /**
1.266 + * Closing a <tt>ByteArrayOutputStream</tt> has no effect. The methods in
1.267 + * this class can be called after the stream has been closed without
1.268 + * generating an <tt>IOException</tt>.
1.269 + * <p>
1.270 + *
1.271 + */
1.272 + public void close() throws IOException {
1.273 + }
1.274 +
1.275 +}