1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/emul/compact/src/main/java/java/io/InputStreamReader.java Wed Jan 23 22:32:27 2013 +0100
1.3 @@ -0,0 +1,201 @@
1.4 +/*
1.5 + * Copyright (c) 1996, 2005, 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.nio.charset.Charset;
1.32 +import java.nio.charset.CharsetDecoder;
1.33 +import sun.nio.cs.StreamDecoder;
1.34 +
1.35 +
1.36 +/**
1.37 + * An InputStreamReader is a bridge from byte streams to character streams: It
1.38 + * reads bytes and decodes them into characters using a specified {@link
1.39 + * java.nio.charset.Charset <code>charset</code>}. The charset that it uses
1.40 + * may be specified by name or may be given explicitly, or the platform's
1.41 + * default charset may be accepted.
1.42 + *
1.43 + * <p> Each invocation of one of an InputStreamReader's read() methods may
1.44 + * cause one or more bytes to be read from the underlying byte-input stream.
1.45 + * To enable the efficient conversion of bytes to characters, more bytes may
1.46 + * be read ahead from the underlying stream than are necessary to satisfy the
1.47 + * current read operation.
1.48 + *
1.49 + * <p> For top efficiency, consider wrapping an InputStreamReader within a
1.50 + * BufferedReader. For example:
1.51 + *
1.52 + * <pre>
1.53 + * BufferedReader in
1.54 + * = new BufferedReader(new InputStreamReader(System.in));
1.55 + * </pre>
1.56 + *
1.57 + * @see BufferedReader
1.58 + * @see InputStream
1.59 + * @see java.nio.charset.Charset
1.60 + *
1.61 + * @author Mark Reinhold
1.62 + * @since JDK1.1
1.63 + */
1.64 +
1.65 +public class InputStreamReader extends Reader {
1.66 +
1.67 + private final StreamDecoder sd;
1.68 +
1.69 + /**
1.70 + * Creates an InputStreamReader that uses the default charset.
1.71 + *
1.72 + * @param in An InputStream
1.73 + */
1.74 + public InputStreamReader(InputStream in) {
1.75 + super(in);
1.76 + try {
1.77 + sd = StreamDecoder.forInputStreamReader(in, this, (String)null); // ## check lock object
1.78 + } catch (UnsupportedEncodingException e) {
1.79 + // The default encoding should always be available
1.80 + throw new Error(e);
1.81 + }
1.82 + }
1.83 +
1.84 + /**
1.85 + * Creates an InputStreamReader that uses the named charset.
1.86 + *
1.87 + * @param in
1.88 + * An InputStream
1.89 + *
1.90 + * @param charsetName
1.91 + * The name of a supported
1.92 + * {@link java.nio.charset.Charset </code>charset<code>}
1.93 + *
1.94 + * @exception UnsupportedEncodingException
1.95 + * If the named charset is not supported
1.96 + */
1.97 + public InputStreamReader(InputStream in, String charsetName)
1.98 + throws UnsupportedEncodingException
1.99 + {
1.100 + super(in);
1.101 + if (charsetName == null)
1.102 + throw new NullPointerException("charsetName");
1.103 + sd = StreamDecoder.forInputStreamReader(in, this, charsetName);
1.104 + }
1.105 +
1.106 + /**
1.107 + * Creates an InputStreamReader that uses the given charset. </p>
1.108 + *
1.109 + * @param in An InputStream
1.110 + * @param cs A charset
1.111 + *
1.112 + * @since 1.4
1.113 + * @spec JSR-51
1.114 + */
1.115 + public InputStreamReader(InputStream in, Charset cs) {
1.116 + super(in);
1.117 + if (cs == null)
1.118 + throw new NullPointerException("charset");
1.119 + sd = StreamDecoder.forInputStreamReader(in, this, cs);
1.120 + }
1.121 +
1.122 + /**
1.123 + * Creates an InputStreamReader that uses the given charset decoder. </p>
1.124 + *
1.125 + * @param in An InputStream
1.126 + * @param dec A charset decoder
1.127 + *
1.128 + * @since 1.4
1.129 + * @spec JSR-51
1.130 + */
1.131 + public InputStreamReader(InputStream in, CharsetDecoder dec) {
1.132 + super(in);
1.133 + if (dec == null)
1.134 + throw new NullPointerException("charset decoder");
1.135 + sd = StreamDecoder.forInputStreamReader(in, this, dec);
1.136 + }
1.137 +
1.138 + /**
1.139 + * Returns the name of the character encoding being used by this stream.
1.140 + *
1.141 + * <p> If the encoding has an historical name then that name is returned;
1.142 + * otherwise the encoding's canonical name is returned.
1.143 + *
1.144 + * <p> If this instance was created with the {@link
1.145 + * #InputStreamReader(InputStream, String)} constructor then the returned
1.146 + * name, being unique for the encoding, may differ from the name passed to
1.147 + * the constructor. This method will return <code>null</code> if the
1.148 + * stream has been closed.
1.149 + * </p>
1.150 + * @return The historical name of this encoding, or
1.151 + * <code>null</code> if the stream has been closed
1.152 + *
1.153 + * @see java.nio.charset.Charset
1.154 + *
1.155 + * @revised 1.4
1.156 + * @spec JSR-51
1.157 + */
1.158 + public String getEncoding() {
1.159 + return sd.getEncoding();
1.160 + }
1.161 +
1.162 + /**
1.163 + * Reads a single character.
1.164 + *
1.165 + * @return The character read, or -1 if the end of the stream has been
1.166 + * reached
1.167 + *
1.168 + * @exception IOException If an I/O error occurs
1.169 + */
1.170 + public int read() throws IOException {
1.171 + return sd.read();
1.172 + }
1.173 +
1.174 + /**
1.175 + * Reads characters into a portion of an array.
1.176 + *
1.177 + * @param cbuf Destination buffer
1.178 + * @param offset Offset at which to start storing characters
1.179 + * @param length Maximum number of characters to read
1.180 + *
1.181 + * @return The number of characters read, or -1 if the end of the
1.182 + * stream has been reached
1.183 + *
1.184 + * @exception IOException If an I/O error occurs
1.185 + */
1.186 + public int read(char cbuf[], int offset, int length) throws IOException {
1.187 + return sd.read(cbuf, offset, length);
1.188 + }
1.189 +
1.190 + /**
1.191 + * Tells whether this stream is ready to be read. An InputStreamReader is
1.192 + * ready if its input buffer is not empty, or if bytes are available to be
1.193 + * read from the underlying byte stream.
1.194 + *
1.195 + * @exception IOException If an I/O error occurs
1.196 + */
1.197 + public boolean ready() throws IOException {
1.198 + return sd.ready();
1.199 + }
1.200 +
1.201 + public void close() throws IOException {
1.202 + sd.close();
1.203 + }
1.204 +}