public CharArrayReader(char[] buf) 
{
        this.buf = buf;
        this.pos = 0;
        this.count = buf.length;
}

Creates a CharArrayReader from the specified array of chars.

Parameters:

buf - Input buffer (not copied)

 public CharArrayReader(char[] buf,
    int offset,
    int length) 
{
        if ((offset <  0) || (offset  > buf.length) || (length <  0) ||
            ((offset + length) <  0)) {
            throw new IllegalArgumentException();
        }
        this.buf = buf;
        this.pos = offset;
        this.count = Math.min(offset + length, buf.length);
        this.markedPos = offset;
}

Creates a CharArrayReader from the specified array of chars.

The resulting reader will start reading at the given offset. The total number of char values that can be read from this reader will be either length or buf.length-offset, whichever is smaller.

Parameters:

buf - Input buffer (not copied)

offset - Offset of the first char to read

length - Number of chars to read

Throws:

IllegalArgumentException - If offset is negative or greater than buf.length, or if length is negative, or if the sum of these two values is negative.

 public  void close() 
{
        buf = null;
}

Closes the stream and releases any system resources associated with it. Once the stream has been closed, further read(), ready(), mark(), reset(), or skip() invocations will throw an IOException. Closing a previously closed stream has no effect.

 public  void mark(int readAheadLimit) throws IOException 
{
        synchronized (lock) {
            ensureOpen();
            markedPos = pos;
        }
}

Marks the present position in the stream. Subsequent calls to reset() will reposition the stream to this point.

 public boolean markSupported() 
{
        return true;
}

Tells whether this stream supports the mark() operation, which it does.

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

Reads a single character.

 public int read(char[] b,
    int off,
    int len) throws IOException 
{
        synchronized (lock) {
            ensureOpen();
            if ((off <  0) || (off  > b.length) || (len <  0) ||
                ((off + len)  > b.length) || ((off + len) <  0)) {
                throw new IndexOutOfBoundsException();
            } else if (len == 0) {
                return 0;
            }
            if (pos  >= count) {
                return -1;
            }
            if (pos + len  > count) {
                len = count - pos;
            }
            if (len < = 0) {
                return 0;
            }
            System.arraycopy(buf, pos, b, off, len);
            pos += len;
            return len;
        }
}

Reads characters into a portion of an array.

 public boolean ready() throws IOException 
{
        synchronized (lock) {
            ensureOpen();
            return (count - pos)  > 0;
        }
}

Tells whether this stream is ready to be read. Character-array readers are always ready to be read.

 public  void reset() throws IOException 
{
        synchronized (lock) {
            ensureOpen();
            pos = markedPos;
        }
}

Resets the stream to the most recent mark, or to the beginning if it has never been marked.

 public long skip(long n) throws IOException 
{
        synchronized (lock) {
            ensureOpen();
            if (pos + n  > count) {
                n = count - pos;
            }
            if (n <  0) {
                return 0;
            }
            pos += n;
            return n;
        }
}

Skips characters. Returns the number of characters that were skipped.

The n parameter may be negative, even though the skip method of the Reader superclass throws an exception in this case. If n is negative, then this method does nothing and returns 0.