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