stringreader.java

kaffe是一个java虚拟机的源代码。里面包含了一些java例程和标准的java包。

package java.io;


/*
 * Java core library component.
 *
 * Copyright (c) 1997, 1998
 *      Transvirtual Technologies, Inc.  All rights reserved.
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file.
 */
public class StringReader
  extends Reader
{
	private char[] buf;
	private int pos;
	private int markpos;

public StringReader(String s) {
	buf = s.toCharArray();
	pos = 0;
	markpos = 0;
}

public void close() {
	// Does nothing.
}

public void mark(int readAheadLimit) throws IOException {
	markpos = pos;
}

public boolean markSupported() {
	return (true);
}

public int read() throws IOException {
	synchronized(lock) {
		if (pos == buf.length) {
			return (-1);
		}
		else {
			return ((int)buf[pos++]);
		}

	}
}

public int read ( char cbuf[], int off, int len ) throws IOException {
	int i;
	final int m = off+len;
	synchronized(lock) {
		for (i = off; i < m && pos < buf.length; i++, pos++ ) {
			cbuf[i] = buf[pos];
		}
		if (i != off) {
			return (i - off);
		}
		return (-1);
	}
}

public boolean ready() throws IOException {
	return (true);
}

public void reset() throws IOException {
	pos = markpos;
}

public long skip(long ns) throws IOException {
	synchronized(lock) {

		long left = (long)(buf.length - pos);
		if (ns < left) {
			left = ns;
		}
		pos += (int)left;
		return (left);

	}
}
}