Class Reader

classpath/java/io/Reader.java:15–58

import java.nio.CharBuffer;

public abstract class Reader implements Closeable, Readable {
  public int read(CharBuffer buffer) throws IOException {
    int c = read(buffer.array(),
                 buffer.arrayOffset() + buffer.position(),
                 buffer.remaining());

    if (c > 0) {
      buffer.position(buffer.position() + c);
    }

    return c;
  }

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

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

  public abstract int read(char[] buffer, int offset, int length)
    throws IOException;

  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");
  }

  public abstract void close() throws IOException;
}