Copyright (C) 2001, Geert Vernaeve. All Rights Reserved.
  Created 25-jan-2001 
package gve.calc.formula;

import java.awt.*;

public class Stack extends Tabular {
	private Part [] elements;

	
 Create an empty Stack 
	public Stack() {
		elements = new Part[0];
	}

	
 Create a Stack with one element 
	public Stack(Part p) {
		elements = new Part[1];
		elements[0] = p;
		p.setParent(this);
	}

	public Stack(Part [] cloneme) {
		elements = new Part[cloneme.length];
		for (int i = cloneme.length-1; i>=0; i--) {
			elements[i] = (Part)cloneme[i].clone();
			elements[i].setParent(this);
		}
	}

	public int getHeight() { return elements.length; }
	public int getWidth() { return 1; }
	public Part elementAt(int i,int j) {
		if (j == 0) return elements[i];
		throw new ArrayIndexOutOfBoundsException("invalid column"+j);
	}
	public void setElementAt(int i,int j,Part el) {
		if (j == 0) {
			elements[i] = el;
			el.setParent(this);
		} else throw new ArrayIndexOutOfBoundsException("invalid column"+j);
	}

	public Part elementAt(int i) { return elements[i]; }
	public void setElementAt(int i,Part el) { elements[i] = el; el.setParent(this); }

	public Object clone() {
		return new Stack(elements);
	}

	public void insertRow(int pos) {
		int h = getHeight();
		Part [] newel = new Part[h+1];
		for (int i = 0; i < h; i++) {
			if (i < pos) newel[i] = elements[i];
			else newel[i+1] = elements[i];
		}
		elements = newel;
		setElementAt(pos,new Identifier());
		super.insertRow(pos);
	}

	public void removeRow(int pos) {
		int h = getHeight();
		Part [] newel = new Part[h-1];
		for (int i = 0; i < h; i++) {
			if (i < pos) newel[i] = elements[i];
			else newel[i] = elements[i+1];
		}
		elements = newel;
		super.removeRow(pos);
	}

	public Component createView(FormulaView view) {
		return new StackView(this,view);
	}
}