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/*
 * Copyright (c) 1998-2018 University Corporation for Atmospheric Research/Unidata
 * See LICENSE for license information.
 */
package ucar.ma2;

/**
 * Specialization of Index for rank 2 arrays.
 *
 * @see Index
 * @author caron
 */
public class Index2D extends Index {

  /** current element's indices */
  private int curr0, curr1;
  /** array strides */
  private int stride0, stride1;
  /** array shapes */
  private int shape0, shape1;

  Index2D() {
    super(2);
  }

  public Index2D(int[] shape) {
    super(shape);
    precalc();
  }

  protected void precalc() {
    shape0 = shape[0];
    shape1 = shape[1];

    stride0 = stride[0];
    stride1 = stride[1];

    curr0 = current[0];
    curr1 = current[1];
  }

  public int[] getCurrentCounter() {
    current[0] = curr0;
    current[1] = curr1;
    return current.clone();
  }

  public String toString() {
    return curr0 + "," + curr1;
  }

  public int currentElement() {
    return offset + curr0 * stride0 + curr1 * stride1;
  }

  public int incr() {
    if (++curr1 >= shape1) {
      curr1 = 0;
      if (++curr0 >= shape0) {
        curr0 = 0; // rollover !
      }
    }
    return offset + curr0 * stride0 + curr1 * stride1;
  }


  public void setDim(int dim, int value) {
    if (value < 0 || value >= shape[dim]) // check index here
      throw new ArrayIndexOutOfBoundsException();
    if (dim == 1)
      curr1 = value;
    else
      curr0 = value;
  }

  public Index set(int[] index) {
    if (index.length != rank)
      throw new ArrayIndexOutOfBoundsException();
    set0(index[0]);
    set1(index[1]);
    return this;
  }

  public Index set0(int v) {
    if (v < 0 || v >= shape0) // check index here
      throw new ArrayIndexOutOfBoundsException();
    curr0 = v;
    return this;
  }

  public Index set1(int v) {
    if (v < 0 || v >= shape1) // check index here
      throw new ArrayIndexOutOfBoundsException("index=" + v + " shape=" + shape1);
    curr1 = v;
    return this;
  }

  public Index set(int v0, int v1) {
    set0(v0);
    set1(v1);
    return this;
  }

  public Object clone() {
    return super.clone();
  }

  int setDirect(int v0, int v1) {
    if (v0 < 0 || v0 >= shape0)
      throw new ArrayIndexOutOfBoundsException();
    if (v1 < 0 || v1 >= shape1)
      throw new ArrayIndexOutOfBoundsException();
    return offset + v0 * stride0 + v1 * stride1;
  }

}