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/*
 * Copyright © 1996-2009 GlobalMentor, Inc. 
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.globalmentor.swing.unicode;

import javax.swing.table.*;
import com.globalmentor.java.Integers;

/**
 * Table model for displaying Unicode code points.
 * @author Garret Wilson
 */
public class UnicodeTableModel extends AbstractTableModel {

	/** The number of Unicode code points. */
	//TODO fix for extended Unicode code points
	protected static final int UNICODE_CODE_POINT_COUNT = 0x10000; //TODO maybe put this in UnicodeConstants

	/** The number of rows of Unicode code points to show at a time. */
	protected static final int ROW_COUNT = 0x10;

	/** The number of columns of Unicode code points to show at a time. */
	protected static final int COLUMN_COUNT = UNICODE_CODE_POINT_COUNT / ROW_COUNT;

	/** Default constructor. */
	public UnicodeTableModel() {
	}

	/** @return The number of rows to display. */
	public int getRowCount() {
		return ROW_COUNT; //return the number of rows to display
	}

	/** @return The number of columns to display. */
	public int getColumnCount() {
		return COLUMN_COUNT; //return the number of columns to display
	}

	/**
	 * Determines the row of a particular code point.
	 * @param codePoint A Unicode code point.
	 * @return The table row in which the code point is shown.
	 */
	public int getRow(final int codePoint) {
		return codePoint % ROW_COUNT;
	}

	/**
	 * Determines the column of a particular code point.
	 * @param codePoint A Unicode code point.
	 * @return The table column in which the code point is shown.
	 */
	public int getColumn(final int codePoint) {
		return codePoint / ROW_COUNT;
	}

	/**
	 * Returns the class of objects being displayed in a given column. This version always returns the Integer class.
	 * @param columnIndex The column being queried.
	 * @return The Integer class.
	 */
	public Class getColumnClass(int columnIndex) {
		return Integer.class; //return the Integer class 
	}

	/**
	 * Returns the Unicode data to display in the given cell.
	 * @param rowIndex The row of the cell.
	 * @param columnIndex The column of the cell.
	 * @return The value to display in the given cell.
	 */
	public Object getValueAt(int rowIndex, int columnIndex) {
		final int codePoint = (ROW_COUNT * columnIndex) + rowIndex; //find out which Unicode code point should appear in this cell
		return Integer.valueOf(codePoint); //return an integer representing this code point
	}

	/**
	 * Returns the name of the column.
	 * @param columnIndex The column to name.
	 * @return The starting Unicode code point value of this row in hex.
	 */
	public String getColumnName(int columnIndex) {
		//TODO fix		return Integer.toHexString(columnIndex%0x10).toUpperCase();  //show the hex values 0...F repeatedly
		return Integers.toHexString(ROW_COUNT * columnIndex, 4).toUpperCase(); //show the starting Unicode code point value of this row in hex
		//TODO del 		return Integer.toHexString(ROW_COUNT*columnIndex).toUpperCase();
	}

	/*TODO fix
	            public Class getColumnClass(int c) {return getValueAt(0, c).getClass();}
	            public boolean isCellEditable(int row, int col) {return true;}
	            public void setValueAt(Object aValue, int row, int column) {
	                System.out.println("Setting value to: " + aValue);
	                data[row][column] = aValue;
	*/
}