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jfreechart example source code file (DefaultPieDataset.java)

This example jfreechart source code file (DefaultPieDataset.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

clonenotsupportedexception, comparable, comparable, defaultkeyedvalues, defaultkeyedvalues, defaultpiedataset, defaultpiedataset, double, illegalargumentexception, io, null, number, number, piedataset, serializable, util

The jfreechart DefaultPieDataset.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.]
 *
 * ----------------------
 * DefaultPieDataset.java
 * ----------------------
 * (C) Copyright 2001-2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   Sam (oldman);
 *
 * Changes
 * -------
 * 17-Nov-2001 : Version 1 (DG);
 * 22-Jan-2002 : Removed legend methods from dataset implementations (DG);
 * 07-Apr-2002 : Modified implementation to guarantee data sequence to remain
 *               in the order categories are added (oldman);
 * 23-Oct-2002 : Added getCategory(int) method and getItemCount() method, in
 *               line with changes to the PieDataset interface (DG);
 * 04-Feb-2003 : Changed underlying data storage to DefaultKeyedValues (DG);
 * 04-Mar-2003 : Inserted DefaultKeyedValuesDataset class into hierarchy (DG);
 * 24-Apr-2003 : Switched places with DefaultKeyedValuesDataset (DG);
 * 18-Aug-2003 : Implemented Cloneable (DG);
 * 03-Mar-2005 : Implemented PublicCloneable (DG);
 * 29-Jun-2005 : Added remove() method (DG);
 * ------------- JFREECHART 1.0.0 ---------------------------------------------
 * 31-Jul-2006 : Added a clear() method to clear all values from the
 *               dataset (DG);
 * 28-Sep-2006 : Added sortByKeys() and sortByValues() methods (DG);
 * 30-Apr-2007 : Added new insertValues() methods (DG);
 *
 */

package org.jfree.data.general;

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

import org.jfree.data.DefaultKeyedValues;
import org.jfree.data.KeyedValues;
import org.jfree.data.UnknownKeyException;
import org.jfree.util.PublicCloneable;
import org.jfree.util.SortOrder;

/**
 * A default implementation of the {@link PieDataset} interface.
 */
public class DefaultPieDataset extends AbstractDataset
        implements PieDataset, Cloneable, PublicCloneable, Serializable {

    /** For serialization. */
    private static final long serialVersionUID = 2904745139106540618L;

    /** Storage for the data. */
    private DefaultKeyedValues data;

    /**
     * Constructs a new dataset, initially empty.
     */
    public DefaultPieDataset() {
        this.data = new DefaultKeyedValues();
    }

    /**
     * Creates a new dataset by copying data from a {@link KeyedValues}
     * instance.
     *
     * @param data  the data (<code>null not permitted).
     */
    public DefaultPieDataset(KeyedValues data) {
        if (data == null) {
            throw new IllegalArgumentException("Null 'data' argument.");
        }
        this.data = new DefaultKeyedValues();
        for (int i = 0; i < data.getItemCount(); i++) {
            this.data.addValue(data.getKey(i), data.getValue(i));
        }
    }

    /**
     * Returns the number of items in the dataset.
     *
     * @return The item count.
     */
    public int getItemCount() {
        return this.data.getItemCount();
    }

    /**
     * Returns the categories in the dataset.  The returned list is
     * unmodifiable.
     *
     * @return The categories in the dataset.
     */
    public List getKeys() {
        return Collections.unmodifiableList(this.data.getKeys());
    }

    /**
     * Returns the key for the specified item, or <code>null.
     *
     * @param item  the item index (in the range <code>0 to
     *     <code>getItemCount() - 1).
     *
     * @return The key, or <code>null.
     *
     * @throws IndexOutOfBoundsException if <code>item is not in the
     *     specified range.
     */
    public Comparable getKey(int item) {
        return this.data.getKey(item);
    }

    /**
     * Returns the index for a key, or -1 if the key is not recognised.
     *
     * @param key  the key (<code>null not permitted).
     *
     * @return The index, or <code>-1 if the key is unrecognised.
     *
     * @throws IllegalArgumentException if <code>key is
     *     <code>null.
     */
    public int getIndex(Comparable key) {
        return this.data.getIndex(key);
    }

    /**
     * Returns a value.
     *
     * @param item  the value index.
     *
     * @return The value (possibly <code>null).
     */
    public Number getValue(int item) {

        Number result = null;
        if (getItemCount() > item) {
            result = this.data.getValue(item);
        }
        return result;

    }

    /**
     * Returns the data value associated with a key.
     *
     * @param key  the key (<code>null not permitted).
     *
     * @return The value (possibly <code>null).
     *
     * @throws UnknownKeyException if the key is not recognised.
     */
    public Number getValue(Comparable key) {
        if (key == null) {
            throw new IllegalArgumentException("Null 'key' argument.");
        }
        return this.data.getValue(key);
    }

    /**
     * Sets the data value for a key and sends a {@link DatasetChangeEvent} to
     * all registered listeners.
     *
     * @param key  the key (<code>null not permitted).
     * @param value  the value.
     *
     * @throws IllegalArgumentException if <code>key is
     *     <code>null.
     */
    public void setValue(Comparable key, Number value) {
        this.data.setValue(key, value);
        fireDatasetChanged();
    }

    /**
     * Sets the data value for a key and sends a {@link DatasetChangeEvent} to
     * all registered listeners.
     *
     * @param key  the key (<code>null not permitted).
     * @param value  the value.
     *
     * @throws IllegalArgumentException if <code>key is
     *     <code>null.
     */
    public void setValue(Comparable key, double value) {
        setValue(key, new Double(value));
    }

    /**
     * Inserts a new value at the specified position in the dataset or, if
     * there is an existing item with the specified key, updates the value
     * for that item and moves it to the specified position.  After the change
     * is made, this methods sends a {@link DatasetChangeEvent} to all
     * registered listeners.
     *
     * @param position  the position (in the range 0 to getItemCount()).
     * @param key  the key (<code>null not permitted).
     * @param value  the value (<code>null permitted).
     *
     * @since 1.0.6
     */
    public void insertValue(int position, Comparable key, double value) {
        insertValue(position, key, new Double(value));
    }

    /**
     * Inserts a new value at the specified position in the dataset or, if
     * there is an existing item with the specified key, updates the value
     * for that item and moves it to the specified position.  After the change
     * is made, this methods sends a {@link DatasetChangeEvent} to all
     * registered listeners.
     *
     * @param position  the position (in the range 0 to getItemCount()).
     * @param key  the key (<code>null not permitted).
     * @param value  the value (<code>null permitted).
     *
     * @since 1.0.6
     */
    public void insertValue(int position, Comparable key, Number value) {
        this.data.insertValue(position, key, value);
        fireDatasetChanged();
    }

    /**
     * Removes an item from the dataset and sends a {@link DatasetChangeEvent}
     * to all registered listeners.
     *
     * @param key  the key (<code>null not permitted).
     *
     * @throws IllegalArgumentException if <code>key is
     *     <code>null.
     */
    public void remove(Comparable key) {
        this.data.removeValue(key);
        fireDatasetChanged();
    }

    /**
     * Clears all data from this dataset and sends a {@link DatasetChangeEvent}
     * to all registered listeners (unless the dataset was already empty).
     *
     * @since 1.0.2
     */
    public void clear() {
        if (getItemCount() > 0) {
            this.data.clear();
            fireDatasetChanged();
        }
    }

    /**
     * Sorts the dataset's items by key and sends a {@link DatasetChangeEvent}
     * to all registered listeners.
     *
     * @param order  the sort order (<code>null not permitted).
     *
     * @since 1.0.3
     */
    public void sortByKeys(SortOrder order) {
        this.data.sortByKeys(order);
        fireDatasetChanged();
    }

    /**
     * Sorts the dataset's items by value and sends a {@link DatasetChangeEvent}
     * to all registered listeners.
     *
     * @param order  the sort order (<code>null not permitted).
     *
     * @since 1.0.3
     */
    public void sortByValues(SortOrder order) {
        this.data.sortByValues(order);
        fireDatasetChanged();
    }

    /**
     * Tests if this object is equal to another.
     *
     * @param obj  the other object.
     *
     * @return A boolean.
     */
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }

        if (!(obj instanceof PieDataset)) {
            return false;
        }
        PieDataset that = (PieDataset) obj;
        int count = getItemCount();
        if (that.getItemCount() != count) {
            return false;
        }

        for (int i = 0; i < count; i++) {
            Comparable k1 = getKey(i);
            Comparable k2 = that.getKey(i);
            if (!k1.equals(k2)) {
                return false;
            }

            Number v1 = getValue(i);
            Number v2 = that.getValue(i);
            if (v1 == null) {
                if (v2 != null) {
                    return false;
                }
            }
            else {
                if (!v1.equals(v2)) {
                    return false;
                }
            }
        }
        return true;

    }

    /**
     * Returns a hash code.
     *
     * @return A hash code.
     */
    public int hashCode() {
        return this.data.hashCode();
    }

    /**
     * Returns a clone of the dataset.
     *
     * @return A clone.
     *
     * @throws CloneNotSupportedException This class will not throw this
     *         exception, but subclasses (if any) might.
     */
    public Object clone() throws CloneNotSupportedException {
        DefaultPieDataset clone = (DefaultPieDataset) super.clone();
        clone.data = (DefaultKeyedValues) this.data.clone();
        return clone;
    }

}

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