/* ===========================================================
 * 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.]
 *
 * -------------------
 * IntervalMarker.java
 * -------------------
 * (C) Copyright 2002-2006, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * $Id: IntervalMarker.java,v 1.6.2.4 2006/10/25 15:47:16 mungady Exp $
 *
 * Changes (since 20-Aug-2002)
 * --------------------------
 * 20-Aug-2002 : Added stroke to constructor in Marker class (DG);
 * 02-Oct-2002 : Fixed errors reported by Checkstyle (DG);
 * 26-Mar-2003 : Implemented Serializable (DG);
 * ------------- JFREECHART 1.0.x ---------------------------------------------
 * 05-Sep-2006 : Added MarkerChangeEvent notification (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.GradientPaintTransformer;
import org.jfree.ui.LengthAdjustmentType;
import org.jfree.util.ObjectUtilities;

/**
 * Represents an interval to be highlighted in some way.
 */
public class IntervalMarker extends Marker implements Cloneable, Serializable {

    /** For serialization. */
    private static final long serialVersionUID = -1762344775267627916L;
    
    /** The start value. */
    private double startValue;

    /** The end value. */
    private double endValue;

    /** The gradient paint transformer (optional). */
    private GradientPaintTransformer gradientPaintTransformer;
    
    /**
     * Constructs an interval marker.
     *
     * @param start  the start of the interval.
     * @param end  the end of the interval.
     */
    public IntervalMarker(double start, double end) {
        this(start, end, Color.gray, new BasicStroke(0.5f), Color.gray, 
                new BasicStroke(0.5f), 0.8f);
    }

    /**
     * Constructs an interval marker.
     *
     * @param start  the start of the interval.
     * @param end  the end of the interval.
     * @param paint  the paint.
     * @param stroke  the stroke.
     * @param outlinePaint  the outline paint.
     * @param outlineStroke  the outline stroke.
     * @param alpha  the alpha transparency.
     */
    public IntervalMarker(double start, double end, 
                          Paint paint, Stroke stroke,
                          Paint outlinePaint, Stroke outlineStroke, 
                          float alpha) {

        super(paint, stroke, outlinePaint, outlineStroke, alpha);
        this.startValue = start;
        this.endValue = end;
        this.gradientPaintTransformer = null;
        setLabelOffsetType(LengthAdjustmentType.CONTRACT);
        
    }

    /**
     * Returns the start value for the interval.
     *
     * @return The start value.
     */
    public double getStartValue() {
        return this.startValue;
    }
    
    /**
     * Sets the start value for the marker and sends a 
     * {@link MarkerChangeEvent} to all registered listeners.
     * 
     * @param value  the value.
     * 
     * @since 1.0.3
     */
    public void setStartValue(double value) {
        this.startValue = value;
        notifyListeners(new MarkerChangeEvent(this));
    }

    /**
     * Returns the end value for the interval.
     *
     * @return The end value.
     */
    public double getEndValue() {
        return this.endValue;
    }
    
    /**
     * Sets the end value for the marker and sends a 
     * {@link MarkerChangeEvent} to all registered listeners.
     * 
     * @param value  the value.
     * 
     * @since 1.0.3
     */
    public void setEndValue(double value) {
        this.endValue = value;
        notifyListeners(new MarkerChangeEvent(this));
    }

    /**
     * Returns the gradient paint transformer.
     * 
     * @return The gradient paint transformer (possibly <code>null</code>).
     */
    public GradientPaintTransformer getGradientPaintTransformer() {
        return this.gradientPaintTransformer;   
    }
    
    /**
     * Sets the gradient paint transformer and sends a 
     * {@link MarkerChangeEvent} to all registered listeners.
     * 
     * @param transformer  the transformer (<code>null</code> permitted).
     */
    public void setGradientPaintTransformer(
            GradientPaintTransformer transformer) {
        this.gradientPaintTransformer = transformer;
        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 == this) {
            return true;   
        }
        if (!(obj instanceof IntervalMarker)) {
            return false;
        }
        if (!super.equals(obj)) {
            return false;
        }
        IntervalMarker that = (IntervalMarker) obj;
        if (this.startValue != that.startValue) {
            return false;   
        }
        if (this.endValue != that.endValue) {
            return false;   
        }
        if (!ObjectUtilities.equal(this.gradientPaintTransformer, 
                that.gradientPaintTransformer)) {
            return false;   
        }
        return true;
    }
    
    /**
     * Returns a clone of the marker.
     * 
     * @return A clone.
     * 
     * @throws CloneNotSupportedException Not thrown by this class, but the 
     *         exception is declared for the use of subclasses.
     */
    public Object clone() throws CloneNotSupportedException {   
        return super.clone();   
    }

}
