Bindings/Java/RowCells.java

/*
 * libbrlapi - A library providing access to braille terminals for applications.
 *
 * Copyright (C) 2006-2023 by
 *   Samuel Thibault <Samuel.Thibault@ens-lyon.org>
 *   Sébastien Hinderer <Sebastien.Hinderer@ens-lyon.org>
 *
 * libbrlapi comes with ABSOLUTELY NO WARRANTY.
 *
 * This is free software, placed under the terms of the
 * GNU Lesser General Public License, as published by the Free Software
 * Foundation; either version 2.1 of the License, or (at your option) any
 * later version. Please see the file LICENSE-LGPL for details.
 *
 * Web Page: http://brltty.app/
 *
 * This software is maintained by Dave Mielke <dave@mielke.cc>.
 */

package org.a11y.brlapi;

public class RowCells extends ParameterComponent {
  private final static int BYTE_SIZE = Byte.SIZE;

  private final byte[] cellArray;
  private final BitMask cellMask;

  private final int copyBytes (byte[] to, byte[] from, int index) {
    int count = to.length;
    System.arraycopy(from, index, to, 0, count);
    return index + count;
  }

  public RowCells (byte[] bytes) {
    if (bytes.length == 0) {
      cellArray = null;
      cellMask = new BitMask(new byte[0]);
    } else {
      cellArray = new byte[0X100];
      int index = copyBytes(cellArray, bytes, 0);

      {
        byte[] mask = new byte[cellArray.length / BYTE_SIZE];
        index = copyBytes(mask, bytes, index);
        cellMask = new BitMask(mask);
      }
    }
  }

  public int getSize () {
    return cellArray.length;
  }

  public boolean isDefined (int index) {
    return cellMask.isSet(index);
  }

  public byte getCell (int index) {
    return isDefined(index)? cellArray[index]: 0;
  }

  @Override
  public String toString () {
    StringBuilder sb = new StringBuilder();
    sb.append('{');
    boolean first = true;

    for (int index : cellMask.getBitNumbers()) {
      if (first) {
        first = false;
      } else {
        sb.append(", ");
      }

      sb.append(
        String.format(
          "%02X:%s", index, asDots(cellArray[index])
        )
      );
    }

    sb.append('}');
    return sb.toString();
  }
}