/*
 * Copyright (C) 2008-2015 by Holger Arndt
 *
 * This file is part of the Java Data Mining Package (JDMP).
 * See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership and licensing.
 *
 * JDMP is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * JDMP 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with JDMP; if not, write to the
 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
 * Boston, MA  02110-1301  USA
 */

package org.jdmp.core.util;

import javax.swing.ListSelectionModel;
import javax.swing.event.EventListenerList;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;

public class FastListSelectionModel implements ListSelectionModel {

	private int selectionMode = SINGLE_INTERVAL_SELECTION;

	private int minIndex = -1;

	private int maxIndex = -1;

	private boolean valueIsAdjusting = false;

	public FastListSelectionModel() {
	}

	protected EventListenerList listenerList = new EventListenerList();

	public void addListSelectionListener(ListSelectionListener l) {
		listenerList.add(ListSelectionListener.class, l);
	}

	public void removeListSelectionListener(ListSelectionListener l) {
		listenerList.remove(ListSelectionListener.class, l);
	}

	public void addSelectionInterval(int index0, int index1) {
		if (index1 > index0) {
			minIndex = Math.min(minIndex, index0);
			maxIndex = Math.max(maxIndex, index1);
		} else {
			minIndex = Math.min(minIndex, index1);
			maxIndex = Math.max(maxIndex, index0);
		}
		fireValueChanged();
	}

	protected void fireValueChanged(int firstIndex, int lastIndex) {
		fireValueChanged(firstIndex, lastIndex, getValueIsAdjusting());
	}

	protected void fireValueChanged(int firstIndex, int lastIndex, boolean isAdjusting) {
		Object[] listeners = listenerList.getListenerList();
		ListSelectionEvent e = null;

		for (int i = listeners.length - 2; i >= 0; i -= 2) {
			if (listeners[i] == ListSelectionListener.class) {
				if (e == null) {
					e = new ListSelectionEvent(this, firstIndex, lastIndex, isAdjusting);
				}
				((ListSelectionListener) listeners[i + 1]).valueChanged(e);
			}
		}
	}

	public void clearSelection() {
		minIndex = -1;
		maxIndex = -1;
		fireValueChanged();
	}

	private void fireValueChanged() {
		fireValueChanged(0, Integer.MAX_VALUE);
	}

	public int getMinSelectionIndex() {
		return minIndex;
	}

	public int getAnchorSelectionIndex() {
		return minIndex;
	}

	public int getLeadSelectionIndex() {
		return maxIndex;
	}

	public int getMaxSelectionIndex() {
		return maxIndex;
	}

	public int getSelectionMode() {
		return selectionMode;
	}

	public boolean getValueIsAdjusting() {
		return valueIsAdjusting;
	}

	public void insertIndexInterval(int index, int length, boolean before) {
		minIndex = Math.min(minIndex, index);
		maxIndex = Math.max(maxIndex, index + length);
		fireValueChanged();
	}

	public boolean isSelectedIndex(int index) {
		return index >= minIndex && index <= maxIndex;
	}

	public boolean isSelectionEmpty() {
		return minIndex == -1 || maxIndex == -1;
	}

	public void removeIndexInterval(int index0, int index1) {
		if (index1 >= index0) {
			minIndex = Math.max(minIndex, index0);
			maxIndex = Math.min(maxIndex, index1);
		} else {
			minIndex = Math.max(minIndex, index1);
			maxIndex = Math.min(maxIndex, index0);
		}
		fireValueChanged();
	}

	public void removeSelectionInterval(int index0, int index1) {
		if (index1 >= index0) {
			minIndex = Math.max(minIndex, index0);
			maxIndex = Math.min(maxIndex, index1);
		} else {
			minIndex = Math.max(minIndex, index1);
			maxIndex = Math.min(maxIndex, index0);
		}
		fireValueChanged();
	}

	public void setAnchorSelectionIndex(int index) {
		minIndex = Math.min(minIndex, index);
		fireValueChanged();
	}

	public void setLeadSelectionIndex(int index) {
		maxIndex = Math.max(maxIndex, index);
		fireValueChanged();
	}

	public void setSelectionInterval(int index0, int index1) {
		if (index1 > index0) {
			minIndex = index0;
			maxIndex = index1;
		} else {
			minIndex = index1;
			maxIndex = index0;
		}
		fireValueChanged();
	}

	public void setSelectionMode(int selectionMode) {
	}

	public void setValueIsAdjusting(boolean valueIsAdjusting) {
		this.valueIsAdjusting = valueIsAdjusting;
	}

}