Java tutorial
/* * Copyright (c) 1996, 2013, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package java.io; import java.nio.charset.Charset; import java.nio.charset.CharsetDecoder; import sun.nio.cs.StreamDecoder; /** * An InputStreamReader is a bridge from byte streams to character streams: It * reads bytes and decodes them into characters using a specified {@link * java.nio.charset.Charset charset}. The charset that it uses * may be specified by name or may be given explicitly, or the platform's * default charset may be accepted. * * <p> Each invocation of one of an InputStreamReader's read() methods may * cause one or more bytes to be read from the underlying byte-input stream. * To enable the efficient conversion of bytes to characters, more bytes may * be read ahead from the underlying stream than are necessary to satisfy the * current read operation. * * <p> For top efficiency, consider wrapping an InputStreamReader within a * BufferedReader. For example: * * <pre> * BufferedReader in * = new BufferedReader(new InputStreamReader(System.in)); * </pre> * * @see BufferedReader * @see InputStream * @see java.nio.charset.Charset * * @author Mark Reinhold * @since 1.1 */ public class InputStreamReader extends Reader { private final StreamDecoder sd; /** * Creates an InputStreamReader that uses the default charset. * * @param in An InputStream */ public InputStreamReader(InputStream in) { super(in); try { sd = StreamDecoder.forInputStreamReader(in, this, (String) null); // ## check lock object } catch (UnsupportedEncodingException e) { // The default encoding should always be available throw new Error(e); } } /** * Creates an InputStreamReader that uses the named charset. * * @param in * An InputStream * * @param charsetName * The name of a supported * {@link java.nio.charset.Charset charset} * * @exception UnsupportedEncodingException * If the named charset is not supported */ public InputStreamReader(InputStream in, String charsetName) throws UnsupportedEncodingException { super(in); if (charsetName == null) throw new NullPointerException("charsetName"); sd = StreamDecoder.forInputStreamReader(in, this, charsetName); } /** * Creates an InputStreamReader that uses the given charset. * * @param in An InputStream * @param cs A charset * * @since 1.4 * @spec JSR-51 */ public InputStreamReader(InputStream in, Charset cs) { super(in); if (cs == null) throw new NullPointerException("charset"); sd = StreamDecoder.forInputStreamReader(in, this, cs); } /** * Creates an InputStreamReader that uses the given charset decoder. * * @param in An InputStream * @param dec A charset decoder * * @since 1.4 * @spec JSR-51 */ public InputStreamReader(InputStream in, CharsetDecoder dec) { super(in); if (dec == null) throw new NullPointerException("charset decoder"); sd = StreamDecoder.forInputStreamReader(in, this, dec); } /** * Returns the name of the character encoding being used by this stream. * * <p> If the encoding has an historical name then that name is returned; * otherwise the encoding's canonical name is returned. * * <p> If this instance was created with the {@link * #InputStreamReader(InputStream, String)} constructor then the returned * name, being unique for the encoding, may differ from the name passed to * the constructor. This method will return <code>null</code> if the * stream has been closed. * </p> * @return The historical name of this encoding, or * <code>null</code> if the stream has been closed * * @see java.nio.charset.Charset * * @revised 1.4 * @spec JSR-51 */ public String getEncoding() { return sd.getEncoding(); } /** * Reads a single character. * * @return The character read, or -1 if the end of the stream has been * reached * * @exception IOException If an I/O error occurs */ public int read() throws IOException { return sd.read(); } /** * Reads characters into a portion of an array. * * @param cbuf Destination buffer * @param offset Offset at which to start storing characters * @param length Maximum number of characters to read * * @return The number of characters read, or -1 if the end of the * stream has been reached * * @exception IOException If an I/O error occurs * @exception IndexOutOfBoundsException {@inheritDoc} */ public int read(char cbuf[], int offset, int length) throws IOException { return sd.read(cbuf, offset, length); } /** * Tells whether this stream is ready to be read. An InputStreamReader is * ready if its input buffer is not empty, or if bytes are available to be * read from the underlying byte stream. * * @exception IOException If an I/O error occurs */ public boolean ready() throws IOException { return sd.ready(); } public void close() throws IOException { sd.close(); } }