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/*
 * Copyright 2016 Carlos Ballesteros Velasco
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package java.io;

//public abstract class Reader implements Readable, Closeable {
public abstract class Reader implements Closeable {
    protected Object lock;

    protected Reader() {
        this.lock = this;
    }

    protected Reader(Object lock) {
        if (lock == null) {
            throw new NullPointerException();
        }
        this.lock = lock;
    }

    /*
    public int read(java.nio.CharBuffer target) throws IOException {
        int len = target.remaining();
        char[] cbuf = new char[len];
        int n = read(cbuf, 0, len);
        if (n > 0)
            target.put(cbuf, 0, n);
        return n;
    }
    */

    public int read() throws IOException {
        char cb[] = new char[1];
        if (read(cb, 0, 1) == -1)
            return -1;
        else
            return cb[0];
    }

    public int read(char cbuf[]) throws IOException {
        return read(cbuf, 0, cbuf.length);
    }

    abstract public int read(char cbuf[], int off, int len) throws IOException;

    private static final int maxSkipBufferSize = 8192;

    private char skipBuffer[] = null;

    public long skip(long n) throws IOException {
        if (n < 0L) throw new IllegalArgumentException("skip value is negative");
        int nn = (int) Math.min(n, maxSkipBufferSize);
        if ((skipBuffer == null) || (skipBuffer.length < nn)) skipBuffer = new char[nn];
        long r = n;
        while (r > 0) {
            int nc = read(skipBuffer, 0, (int) Math.min(r, nn));
            if (nc == -1) break;
            r -= nc;
        }
        return n - r;
    }

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

    public boolean markSupported() {
        return false;
    }

    public void mark(int readAheadLimit) throws IOException {
        throw new IOException("mark() not supported");
    }

    public void reset() throws IOException {
        throw new IOException("reset() not supported");
    }

    abstract public void close() throws IOException;

}