Copyright (C) 2000, 2001, Geert Vernaeve. 
package gve.calc.formula;

import awt.*;
import java.awt.*;

public abstract class Tabular extends Part {
	public Tabular() {}

	public abstract int getHeight();
	public abstract int getWidth();

	
 get element at row i and column j 
	public abstract Part elementAt(int i,int j);
	public abstract void setElementAt(int i,int j,Part el);

	public Part evaluate(Evaluator ev) {
		return (Part)clone();
	}

	public void replaceChild(Part child,Part byThat) {
		int w = getWidth(), h = getHeight();
		for (int i = 0; i < h; i++)
			for (int j = 0; j < w; j++)
				if (elementAt(i,j) == child) {
					setElementAt(i,j,byThat);
					return;
				}
	}

	
 Returns Point(x=col,y=row) or null 
	public Point whichChild(Part ch) {
		int w = getWidth(), h = getHeight();
		for (int i = 0; i < h; i++) {
			for (int j = 0; j < w; j++) {
				if (ch == elementAt(i,j)) return new Point(j,i);
			}
		}
		return null;
	}

	public Point whichOffspring(Part ch) {
		while (true) {
			if (ch == null) return null;
			if (ch.parent == this) return whichChild(ch);
			ch = ch.parent;
		}
	}

	
 pos is the index of the new to be created row 
	public void insertRow(int pos) {
		MVC.changed(this,new TabularModified(pos,true,true));
	}

	
 Subclasses overriding this method should do their work and
	  at the end call super.insertCol(pos) 
	public void insertCol(int pos) {
		MVC.changed(this,new TabularModified(pos,true,false));
	}

	public void removeCol(int pos) {
		MVC.changed(this,new TabularModified(pos,false,false));
	}

	public void removeRow(int pos) {
		MVC.changed(this,new TabularModified(pos,false,true));
	}

	public void writeTable(java.io.Writer w) throws java.io.IOException {
		int width = getWidth(), height = getHeight();
		for (int i = 0; i < height; i++)
			for (int j = 0; j < width; j++)
				elementAt(i,j).write(w);
	}

	
 Utility method for subclasses 
	public void readTable(java.io.BufferedReader r) throws java.io.IOException,
			ClassNotFoundException,NoSuchMethodException,
			java.lang.reflect.InvocationTargetException,IllegalAccessException {
		int width = getWidth(), height = getHeight();
		for (int i = 0; i < height; i++)
			for (int j = 0; j < width; j++)
				setElementAt(i,j,Part.read(r));
	}

	public static final Part [] removeRow(Part []array,int pos) {
		Part [] result = new Part[array.length-1];
		for (int i = pos-1; i>=0; i--) result[i] = array[i];
		for (int i = array.length-1; i>pos; i--) result[i-1] = array[i];
		return result;
	}

	
 Utility method for subclasses.
	  Returns a new array with an empty row inserted. 
	public final Part [] insertRow(Part []array,int pos) {
		Part [] result = new Part[array.length+1];
		for (int i = pos-1; i>=0; i--) result[i] = array[i];
		for (int i = array.length-1; i>=pos; i--) result[i+1] = array[i];
		result[pos] = new Identifier("");
		result[pos].parent = this;
		return result;
	}

	public Part getChild(int count) {
		if (count < 0) return null;
		int width = getWidth();
		int row = count / width;
		if (row >= getHeight()) return null;
		return elementAt(row,count % width);
	}

	public boolean same(Object o) {
		if (!(o instanceof Tabular)) return false;
		Tabular obj = (Tabular)o;
		int width = getWidth();
		int height = getHeight();
		if (width != obj.getWidth()) return false;
		if (height != obj.getHeight()) return false;
		for (int i = height-1; i>=0; i--) {
			for (int j = width-1; j>=0; j--) {
				if (!elementAt(i,j).same(obj.elementAt(i,j))) return false;
			}
		}
		return true;
	}

	public Component createView(FormulaView f) {
		return new TabularView(this,f);
	}
}