home | career | drupal | java | mac | mysql | perl | scala | uml | unix  

jfreechart example source code file (SimpleHistogramDataset.java)

This example jfreechart source code file (SimpleHistogramDataset.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - jfreechart tags/keywords

arraylist, comparable, datasetchangeevent, datasetchangeevent, double, io, iterator, list, number, number, runtimeexception, simplehistogrambin, simplehistogrambin, simplehistogramdataset, simplehistogramdataset, util

The jfreechart SimpleHistogramDataset.java source code

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2008, 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.]
 *
 * ---------------------------
 * SimpleHistogramDataset.java
 * ---------------------------
 * (C) Copyright 2005-2008, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   Sergei Ivanov;
 *
 * Changes
 * -------
 * 10-Jan-2005 : Version 1 (DG);
 * 21-May-2007 : Added clearObservations() and removeAllBins() (SI);
 * 10-Jul-2007 : Added null argument check to constructor (DG);
 *
 */

package org.jfree.data.statistics;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;

import org.jfree.data.DomainOrder;
import org.jfree.data.general.DatasetChangeEvent;
import org.jfree.data.xy.AbstractIntervalXYDataset;
import org.jfree.data.xy.IntervalXYDataset;
import org.jfree.util.ObjectUtilities;
import org.jfree.util.PublicCloneable;

/**
 * A dataset used for creating simple histograms with custom defined bins.
 *
 * @see HistogramDataset
 */
public class SimpleHistogramDataset extends AbstractIntervalXYDataset
        implements IntervalXYDataset, Cloneable, PublicCloneable,
            Serializable {

    /** For serialization. */
    private static final long serialVersionUID = 7997996479768018443L;

    /** The series key. */
    private Comparable key;

    /** The bins. */
    private List bins;

    /**
     * A flag that controls whether or not the bin count is divided by the
     * bin size.
     */
    private boolean adjustForBinSize;

    /**
     * Creates a new histogram dataset.  Note that the
     * <code>adjustForBinSize flag defaults to true.
     *
     * @param key  the series key (<code>null not permitted).
     */
    public SimpleHistogramDataset(Comparable key) {
        if (key == null) {
            throw new IllegalArgumentException("Null 'key' argument.");
        }
        this.key = key;
        this.bins = new ArrayList();
        this.adjustForBinSize = true;
    }

    /**
     * Returns a flag that controls whether or not the bin count is divided by
     * the bin size in the {@link #getXValue(int, int)} method.
     *
     * @return A boolean.
     *
     * @see #setAdjustForBinSize(boolean)
     */
    public boolean getAdjustForBinSize() {
        return this.adjustForBinSize;
    }

    /**
     * Sets the flag that controls whether or not the bin count is divided by
     * the bin size in the {@link #getYValue(int, int)} method, and sends a
     * {@link DatasetChangeEvent} to all registered listeners.
     *
     * @param adjust  the flag.
     *
     * @see #getAdjustForBinSize()
     */
    public void setAdjustForBinSize(boolean adjust) {
        this.adjustForBinSize = adjust;
        notifyListeners(new DatasetChangeEvent(this, this));
    }

    /**
     * Returns the number of series in the dataset (always 1 for this dataset).
     *
     * @return The series count.
     */
    public int getSeriesCount() {
        return 1;
    }

    /**
     * Returns the key for a series.  Since this dataset only stores a single
     * series, the <code>series argument is ignored.
     *
     * @param series  the series (zero-based index, ignored in this dataset).
     *
     * @return The key for the series.
     */
    public Comparable getSeriesKey(int series) {
        return this.key;
    }

    /**
     * Returns the order of the domain (or X) values returned by the dataset.
     *
     * @return The order (never <code>null).
     */
    public DomainOrder getDomainOrder() {
        return DomainOrder.ASCENDING;
    }

    /**
     * Returns the number of items in a series.  Since this dataset only stores
     * a single series, the <code>series argument is ignored.
     *
     * @param series  the series index (zero-based, ignored in this dataset).
     *
     * @return The item count.
     */
    public int getItemCount(int series) {
        return this.bins.size();
    }

    /**
     * Adds a bin to the dataset.  An exception is thrown if the bin overlaps
     * with any existing bin in the dataset.
     *
     * @param bin  the bin (<code>null not permitted).
     *
     * @see #removeAllBins()
     */
    public void addBin(SimpleHistogramBin bin) {
        // check that the new bin doesn't overlap with any existing bin
        Iterator iterator = this.bins.iterator();
        while (iterator.hasNext()) {
            SimpleHistogramBin existingBin
                    = (SimpleHistogramBin) iterator.next();
            if (bin.overlapsWith(existingBin)) {
                throw new RuntimeException("Overlapping bin");
            }
        }
        this.bins.add(bin);
        Collections.sort(this.bins);
    }

    /**
     * Adds an observation to the dataset (by incrementing the item count for
     * the appropriate bin).  A runtime exception is thrown if the value does
     * not fit into any bin.
     *
     * @param value  the value.
     */
    public void addObservation(double value) {
        addObservation(value, true);
    }

    /**
     * Adds an observation to the dataset (by incrementing the item count for
     * the appropriate bin).  A runtime exception is thrown if the value does
     * not fit into any bin.
     *
     * @param value  the value.
     * @param notify  send {@link DatasetChangeEvent} to listeners?
     */
    public void addObservation(double value, boolean notify) {
        boolean placed = false;
        Iterator iterator = this.bins.iterator();
        while (iterator.hasNext() && !placed) {
            SimpleHistogramBin bin = (SimpleHistogramBin) iterator.next();
            if (bin.accepts(value)) {
                bin.setItemCount(bin.getItemCount() + 1);
                placed = true;
            }
        }
        if (!placed) {
            throw new RuntimeException("No bin.");
        }
        if (notify) {
            notifyListeners(new DatasetChangeEvent(this, this));
        }
    }

    /**
     * Adds a set of values to the dataset and sends a
     * {@link DatasetChangeEvent} to all registered listeners.
     *
     * @param values  the values (<code>null not permitted).
     *
     * @see #clearObservations()
     */
    public void addObservations(double[] values) {
        for (int i = 0; i < values.length; i++) {
            addObservation(values[i], false);
        }
        notifyListeners(new DatasetChangeEvent(this, this));
    }

    /**
     * Removes all current observation data and sends a
     * {@link DatasetChangeEvent} to all registered listeners.
     *
     * @since 1.0.6
     *
     * @see #addObservations(double[])
     * @see #removeAllBins()
     */
    public void clearObservations() {
        Iterator iterator = this.bins.iterator();
        while (iterator.hasNext()) {
            SimpleHistogramBin bin = (SimpleHistogramBin) iterator.next();
            bin.setItemCount(0);
        }
        notifyListeners(new DatasetChangeEvent(this, this));
    }

    /**
     * Removes all bins and sends a {@link DatasetChangeEvent} to all
     * registered listeners.
     *
     * @since 1.0.6
     *
     * @see #addBin(SimpleHistogramBin)
     */
    public void removeAllBins() {
        this.bins = new ArrayList();
        notifyListeners(new DatasetChangeEvent(this, this));
    }

    /**
     * Returns the x-value for an item within a series.  The x-values may or
     * may not be returned in ascending order, that is up to the class
     * implementing the interface.
     *
     * @param series  the series index (zero-based).
     * @param item  the item index (zero-based).
     *
     * @return The x-value (never <code>null).
     */
    public Number getX(int series, int item) {
        return new Double(getXValue(series, item));
    }

    /**
     * Returns the x-value (as a double primitive) for an item within a series.
     *
     * @param series  the series index (zero-based).
     * @param item  the item index (zero-based).
     *
     * @return The x-value.
     */
    public double getXValue(int series, int item) {
        SimpleHistogramBin bin = (SimpleHistogramBin) this.bins.get(item);
        return (bin.getLowerBound() + bin.getUpperBound()) / 2.0;
    }

    /**
     * Returns the y-value for an item within a series.
     *
     * @param series  the series index (zero-based).
     * @param item  the item index (zero-based).
     *
     * @return The y-value (possibly <code>null).
     */
    public Number getY(int series, int item) {
        return new Double(getYValue(series, item));
    }

    /**
     * Returns the y-value (as a double primitive) for an item within a series.
     *
     * @param series  the series index (zero-based).
     * @param item  the item index (zero-based).
     *
     * @return The y-value.
     *
     * @see #getAdjustForBinSize()
     */
    public double getYValue(int series, int item) {
        SimpleHistogramBin bin = (SimpleHistogramBin) this.bins.get(item);
        if (this.adjustForBinSize) {
            return bin.getItemCount()
                   / (bin.getUpperBound() - bin.getLowerBound());
        }
        else {
            return bin.getItemCount();
        }
    }

    /**
     * Returns the starting X value for the specified series and item.
     *
     * @param series  the series index (zero-based).
     * @param item  the item index (zero-based).
     *
     * @return The value.
     */
    public Number getStartX(int series, int item) {
        return new Double(getStartXValue(series, item));
    }

    /**
     * Returns the start x-value (as a double primitive) for an item within a
     * series.
     *
     * @param series  the series (zero-based index).
     * @param item  the item (zero-based index).
     *
     * @return The start x-value.
     */
    public double getStartXValue(int series, int item) {
        SimpleHistogramBin bin = (SimpleHistogramBin) this.bins.get(item);
        return bin.getLowerBound();
    }

    /**
     * Returns the ending X value for the specified series and item.
     *
     * @param series  the series index (zero-based).
     * @param item  the item index (zero-based).
     *
     * @return The value.
     */
    public Number getEndX(int series, int item) {
        return new Double(getEndXValue(series, item));
    }

    /**
     * Returns the end x-value (as a double primitive) for an item within a
     * series.
     *
     * @param series  the series index (zero-based).
     * @param item  the item index (zero-based).
     *
     * @return The end x-value.
     */
    public double getEndXValue(int series, int item) {
        SimpleHistogramBin bin = (SimpleHistogramBin) this.bins.get(item);
        return bin.getUpperBound();
    }

    /**
     * Returns the starting Y value for the specified series and item.
     *
     * @param series  the series index (zero-based).
     * @param item  the item index (zero-based).
     *
     * @return The value.
     */
    public Number getStartY(int series, int item) {
        return getY(series, item);
    }

    /**
     * Returns the start y-value (as a double primitive) for an item within a
     * series.
     *
     * @param series  the series index (zero-based).
     * @param item  the item index (zero-based).
     *
     * @return The start y-value.
     */
    public double getStartYValue(int series, int item) {
        return getYValue(series, item);
    }

    /**
     * Returns the ending Y value for the specified series and item.
     *
     * @param series  the series index (zero-based).
     * @param item  the item index (zero-based).
     *
     * @return The value.
     */
    public Number getEndY(int series, int item) {
        return getY(series, item);
    }

    /**
     * Returns the end y-value (as a double primitive) for an item within a
     * series.
     *
     * @param series  the series index (zero-based).
     * @param item  the item index (zero-based).
     *
     * @return The end y-value.
     */
    public double getEndYValue(int series, int item) {
        return getYValue(series, item);
    }

    /**
     * Compares the dataset for equality with an arbitrary object.
     *
     * @param obj  the object (<code>null permitted).
     *
     * @return A boolean.
     */
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof SimpleHistogramDataset)) {
            return false;
        }
        SimpleHistogramDataset that = (SimpleHistogramDataset) obj;
        if (!this.key.equals(that.key)) {
            return false;
        }
        if (this.adjustForBinSize != that.adjustForBinSize) {
            return false;
        }
        if (!this.bins.equals(that.bins)) {
            return false;
        }
        return true;
    }

    /**
     * Returns a clone of the dataset.
     *
     * @return A clone.
     *
     * @throws CloneNotSupportedException not thrown by this class, but maybe
     *         by subclasses (if any).
     */
    public Object clone() throws CloneNotSupportedException {
        SimpleHistogramDataset clone = (SimpleHistogramDataset) super.clone();
        clone.bins = (List) ObjectUtilities.deepClone(this.bins);
        return clone;
    }

}

Other jfreechart examples (source code examples)

Here is a short list of links related to this jfreechart SimpleHistogramDataset.java source code file:



my book on functional programming

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.