/*
 *  RapidMiner
 *
 *  Copyright (C) 2001-2011 by Rapid-I and the contributors
 *
 *  Complete list of developers available at our web site:
 *
 *       http://rapid-i.com
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Affero General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Affero General Public License for more details.
 *
 *  You should have received a copy of the GNU Affero General Public License
 *  along with this program.  If not, see http://www.gnu.org/licenses/.
 */
package com.rapidminer.operator.nio;

import java.util.Arrays;

import javax.swing.event.TableModelEvent;
import javax.swing.event.TableModelListener;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.TableModel;

public class RowFilteringTableModel extends AbstractTableModel {

	private static final long serialVersionUID = 1L;
	
	private TableModel wrappedModel;
	private boolean enabled = false;
	
	private int[] rowMap;
	
	public RowFilteringTableModel(TableModel wrappedModel, int[] rowMap, boolean enabled) {
		this.rowMap = rowMap;
		this.wrappedModel = wrappedModel;
		this.enabled = enabled;
		wrappedModel.addTableModelListener(new TableModelListener() {
			@Override
			public void tableChanged(TableModelEvent e) {
				TableModelEvent translated;
				translated = new TableModelEvent(RowFilteringTableModel.this, translateRow(e.getFirstRow()), translateRow(e.getLastRow()), e.getColumn(), e.getType());
				fireTableChanged(translated);		
			}
		});
	}

	/** Translates the row index in this table to the row index in the wrapped model. */
	protected int translateRow(int row) {
		if (enabled) {	
			return rowMap[row];
		} else {
			return row;
		}
	}

	/** Translates the row index in the wrapped model to the row index in this model. */
	protected int inverseTranslateRow(int row) {
		if (enabled) {
			return Arrays.binarySearch(rowMap, row);
		} else {
			return row;
		}
	}

	@Override
	public int getRowCount() {
		if (enabled) {	
			return rowMap.length;
		} else {
			return wrappedModel.getRowCount();
		}
	}

	@Override
	public int getColumnCount() {
		return wrappedModel.getColumnCount();
	}

	@Override
	public Object getValueAt(int rowIndex, int columnIndex) {
		return wrappedModel.getValueAt(translateRow(rowIndex), columnIndex);
	}
	
	@Override
	public String getColumnName(int column) {
		return wrappedModel.getColumnName(column);
	}
	
	@Override
	public Class<?> getColumnClass(int columnIndex) {
		return wrappedModel.getColumnClass(columnIndex);
	}

	public void setWrappedModel(TableModel wm, int[] rowMap) {
		int oldSize = getRowCount();
		this.wrappedModel = wm;
		this.rowMap = rowMap;
		fireChange(oldSize);
	}
	
	public void setFilterEnabled(boolean enabled) {
		int oldSize = getRowCount();
		this.enabled = enabled;
		fireChange(oldSize);
	}

	private void fireChange(int oldSize) {
		if (getRowCount() > oldSize) {
			fireTableRowsInserted(oldSize, getRowCount());
		} else {
			fireTableRowsDeleted(getRowCount(), oldSize);
		}
		fireTableDataChanged();	
	}
}