88 lines
1.7 KiB
Java
88 lines
1.7 KiB
Java
/* Copyright (C) 1998, 1999 Red Hat, Inc.
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This file is part of libgcj.
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This software is copyrighted work licensed under the terms of the
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Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
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details. */
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package java.io;
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/**
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* @author Per Bothner <bothner@cygnus.com>
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* @date April 21, 1998.
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*/
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/* Written using "Java Class Libraries", 2nd edition, plus online
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* API docs for JDK 1.2 beta from http://www.javasoft.com.
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* Status: Believed complete and correct.
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*/
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public abstract class Reader
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{
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protected Object lock;
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protected Reader()
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{
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this.lock = this;
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}
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protected Reader(Object lock)
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{
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this.lock = lock;
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}
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abstract public int read(char buf[], int offset, int count)
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throws IOException;
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public int read(char buf[]) throws IOException
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{
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return read(buf, 0, buf.length);
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}
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public int read() throws IOException
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{
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char[] buf = new char[1];
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int count = read(buf, 0, 1);
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return count > 0 ? buf[0] : -1;
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}
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abstract public void close() throws IOException;
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public boolean markSupported()
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{
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return false;
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}
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public void mark(int readLimit) throws IOException
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{
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throw new IOException("mark not supported");
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}
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public void reset() throws IOException
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{
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throw new IOException("reset not supported");
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}
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public boolean ready() throws IOException
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{
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return false;
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}
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public long skip(long count) throws IOException
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{
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if (count <= 0)
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return 0;
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int bsize = count > 1024 ? 1024 : (int) count;
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char[] buffer = new char[bsize];
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long todo = count;
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while (todo > 0)
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{
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int skipped = read(buffer, 0, bsize > todo ? (int) todo : bsize);
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if (skipped <= 0)
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break;
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todo -= skipped;
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}
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return count - todo;
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}
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}
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