/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2006, by Object Refinery Limited and Contributors.
 *
 * Project Info:  http://www.jfree.org/jfreechart/index.html
 *
 * This library 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 2.1 of the License, or 
 * (at your option) any later version.
 *
 * This library 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 this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 
 * USA.  
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
 * in the United States and other countries.]
 *
 * -------------------
 * CategoryMarker.java
 * -------------------
 * (C) Copyright 2005, 2006, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   Nicolas Brodu;
 *
 * $Id: CategoryMarker.java,v 1.1.2.4 2006/10/24 15:39:20 mungady Exp $
 *
 * Changes
 * -------
 * 20-May-2005 : Version 1 (DG);
 * 19-Aug-2005 : Implemented equals(), fixed bug in constructor (DG);
 * ------------- JFREECHART 1.0.x ---------------------------------------------
 * 05-Sep-2006 : Added MarkerChangeListener support (DG);
 *
 */

package org.jfree.chart.plot;

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Paint;
import java.awt.Stroke;
import java.io.Serializable;

import org.jfree.chart.event.MarkerChangeEvent;
import org.jfree.ui.LengthAdjustmentType;

/**
 * A marker for a category.
 * <br><br>
 * Note that for serialization to work correctly, the category key must be an
 * instance of a serializable class.
 * 
 * @see CategoryPlot#addDomainMarker(CategoryMarker)
 */
public class CategoryMarker extends Marker implements Cloneable, Serializable {

    /** The category key. */
    private Comparable key;
    
    /** 
     * A hint that the marker should be drawn as a line rather than a region. 
     */
    private boolean drawAsLine = false;
    
    /**
     * Creates a new category marker for the specified category.
     * 
     * @param key  the category key.
     */
    public CategoryMarker(Comparable key) {
        this(key, Color.gray, new BasicStroke(1.0f));    
    }
    
    /**
     * Creates a new category marker.
     * 
     * @param key  the key.
     * @param paint  the paint (<code>null</code> not permitted).
     * @param stroke  the stroke (<code>null</code> not permitted).
     */
    public CategoryMarker(Comparable key, Paint paint, Stroke stroke) {
        this(key, paint, stroke, paint, stroke, 1.0f);
    }
    
    /**
     * Creates a new category marker.
     * 
     * @param key  the key.
     * @param paint  the paint (<code>null</code> not permitted).
     * @param stroke  the stroke (<code>null</code> not permitted).
     * @param outlinePaint  the outline paint (<code>null</code> permitted).
     * @param outlineStroke  the outline stroke (<code>null</code> permitted).
     * @param alpha  the alpha transparency.
     */
    public CategoryMarker(Comparable key, Paint paint, Stroke stroke, 
                          Paint outlinePaint, Stroke outlineStroke, 
                          float alpha) {
        super(paint, stroke, outlinePaint, outlineStroke, alpha);
        this.key = key;
        setLabelOffsetType(LengthAdjustmentType.EXPAND);
    }
    
    /**
     * Returns the key.
     * 
     * @return The key.
     */
    public Comparable getKey() {
        return this.key;   
    }
    
    /**
     * Sets the key and sends a {@link MarkerChangeEvent} to all registered
     * listeners.
     * 
     * @param key  the key (<code>null</code> not permitted).
     * 
     * @since 1.0.3
     */
    public void setKey(Comparable key) {
        if (key == null) {
            throw new IllegalArgumentException("Null 'key' argument.");
        }
        this.key = key;
        notifyListeners(new MarkerChangeEvent(this));
    }
    
    /**
     * Returns the flag that controls whether the marker is drawn as a region 
     * or a line.
     * 
     * @return A line.
     */
    public boolean getDrawAsLine() {
        return this.drawAsLine;   
    }
    
    /**
     * Sets the flag that controls whether the marker is drawn as a region or
     * as a line, and sends a {@link MarkerChangeEvent} to all registered
     * listeners.
     * 
     * @param drawAsLine  the flag.
     */
    public void setDrawAsLine(boolean drawAsLine) {
        this.drawAsLine = drawAsLine;
        notifyListeners(new MarkerChangeEvent(this));
    }
    
    /**
     * Tests the marker for equality with an arbitrary object.
     * 
     * @param obj  the object (<code>null</code> permitted).
     * 
     * @return A boolean.
     */
    public boolean equals(Object obj) {
        if (obj == null) {
            return false;
        }
        if (!(obj instanceof CategoryMarker)) {
            return false;
        }
        if (!super.equals(obj)) {
            return false;
        }
        CategoryMarker that = (CategoryMarker) obj;
        if (!this.key.equals(that.key)) {
            return false;
        }
        if (this.drawAsLine != that.drawAsLine) {
            return false;
        }
        return true;
    }
    
}
