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

jfreechart example source code file (CategoryToPieDataset.java)

This example jfreechart source code file (CategoryToPieDataset.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

categorydataset, categorytopiedataset, comparable, comparable, illegalargumentexception, indexoutofboundsexception, invalid, list, number, number, piedataset, piedataset, tableorder, tableorder, util

The jfreechart CategoryToPieDataset.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.]
 *
 * -------------------------
 * CategoryToPieDataset.java
 * -------------------------
 * (C) Copyright 2003-2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   Christian W. Zuckschwerdt;
 *
 * Changes
 * -------
 * 23-Jan-2003 : Version 1 (DG);
 * 30-Jul-2003 : Pass through DatasetChangeEvent (CZ);
 * 29-Jan-2004 : Replaced 'extract' int with TableOrder (DG);
 * 11-Jan-2005 : Removed deprecated code in preparation for the 1.0.0
 *               release (DG);
 * ------------- JFREECHART 1.0.0 RELEASED ------------------------------------
 * 26-Jul-2006 : Added serialVersionUID, changed constructor to allow null
 *               for source, and added getSource(), getExtractType() and
 *               getExtractIndex() methods - see feature request 1477915 (DG);
 *
 */

package org.jfree.data.category;

import java.util.Collections;
import java.util.List;

import org.jfree.data.general.AbstractDataset;
import org.jfree.data.general.DatasetChangeEvent;
import org.jfree.data.general.DatasetChangeListener;
import org.jfree.data.general.PieDataset;
import org.jfree.util.TableOrder;

/**
 * A {@link PieDataset} implementation that obtains its data from one row or
 * column of a {@link CategoryDataset}.
 */
public class CategoryToPieDataset extends AbstractDataset
        implements PieDataset, DatasetChangeListener {

    /** For serialization. */
    static final long serialVersionUID = 5516396319762189617L;

    /** The source. */
    private CategoryDataset source;

    /** The extract type. */
    private TableOrder extract;

    /** The row or column index. */
    private int index;

    /**
     * An adaptor class that converts any {@link CategoryDataset} into a
     * {@link PieDataset}, by taking the values from a single row or column.
     * <p>
     * If <code>source is null, the created dataset will
     * be empty.
     *
     * @param source  the source dataset (<code>null permitted).
     * @param extract  extract data from rows or columns? (<code>null
     *                 not permitted).
     * @param index  the row or column index.
     */
    public CategoryToPieDataset(CategoryDataset source,
                                TableOrder extract,
                                int index) {
        if (extract == null) {
            throw new IllegalArgumentException("Null 'extract' argument.");
        }
        this.source = source;
        if (this.source != null) {
            this.source.addChangeListener(this);
        }
        this.extract = extract;
        this.index = index;
    }

    /**
     * Returns the underlying dataset.
     *
     * @return The underlying dataset (possibly <code>null).
     *
     * @since 1.0.2
     */
    public CategoryDataset getUnderlyingDataset() {
        return this.source;
    }

    /**
     * Returns the extract type, which determines whether data is read from
     * one row or one column of the underlying dataset.
     *
     * @return The extract type.
     *
     * @since 1.0.2
     */
    public TableOrder getExtractType() {
        return this.extract;
    }

    /**
     * Returns the index of the row or column from which to extract the data.
     *
     * @return The extract index.
     *
     * @since 1.0.2
     */
    public int getExtractIndex() {
        return this.index;
    }

    /**
     * Returns the number of items (values) in the collection.  If the
     * underlying dataset is <code>null, this method returns zero.
     *
     * @return The item count.
     */
    public int getItemCount() {
        int result = 0;
        if (this.source != null) {
            if (this.extract == TableOrder.BY_ROW) {
                result = this.source.getColumnCount();
            }
            else if (this.extract == TableOrder.BY_COLUMN) {
                result = this.source.getRowCount();
            }
        }
        return result;
    }

    /**
     * Returns a value from the dataset.
     *
     * @param item  the item index (zero-based).
     *
     * @return The value (possibly <code>null).
     *
     * @throws IndexOutOfBoundsException if <code>item is not in the
     *     range <code>0 to getItemCount() - 1.
     */
    public Number getValue(int item) {
        Number result = null;
        if (item < 0 || item >= getItemCount()) {
            // this will include the case where the underlying dataset is null
            throw new IndexOutOfBoundsException(
                    "The 'item' index is out of bounds.");
        }
        if (this.extract == TableOrder.BY_ROW) {
            result = this.source.getValue(this.index, item);
        }
        else if (this.extract == TableOrder.BY_COLUMN) {
            result = this.source.getValue(item, this.index);
        }
        return result;
    }

    /**
     * Returns the key at the specified index.
     *
     * @param index  the item index (in the range <code>0 to
     *     <code>getItemCount() - 1).
     *
     * @return The key.
     *
     * @throws IndexOutOfBoundsException if <code>index is not in the
     *     specified range.
     */
    public Comparable getKey(int index) {
        Comparable result = null;
        if (index < 0 || index >= getItemCount()) {
            // this includes the case where the underlying dataset is null
            throw new IndexOutOfBoundsException("Invalid 'index': " + index);
        }
        if (this.extract == TableOrder.BY_ROW) {
            result = this.source.getColumnKey(index);
        }
        else if (this.extract == TableOrder.BY_COLUMN) {
            result = this.source.getRowKey(index);
        }
        return result;
    }

    /**
     * Returns the index for a given key, or <code>-1 if there is no
     * such key.
     *
     * @param key  the key.
     *
     * @return The index for the key, or <code>-1.
     */
    public int getIndex(Comparable key) {
        int result = -1;
        if (this.source != null) {
            if (this.extract == TableOrder.BY_ROW) {
                result = this.source.getColumnIndex(key);
            }
            else if (this.extract == TableOrder.BY_COLUMN) {
                result = this.source.getRowIndex(key);
            }
        }
        return result;
    }

    /**
     * Returns the keys for the dataset.
     * <p>
     * If the underlying dataset is <code>null, this method returns an
     * empty list.
     *
     * @return The keys.
     */
    public List getKeys() {
        List result = Collections.EMPTY_LIST;
        if (this.source != null) {
            if (this.extract == TableOrder.BY_ROW) {
                result = this.source.getColumnKeys();
            }
            else if (this.extract == TableOrder.BY_COLUMN) {
                result = this.source.getRowKeys();
            }
        }
        return result;
    }

    /**
     * Returns the value for a given key.  If the key is not recognised, the
     * method should return <code>null (but note that null
     * can be associated with a valid key also).
     *
     * @param key  the key.
     *
     * @return The value (possibly <code>null).
     */
    public Number getValue(Comparable key) {
        Number result = null;
        int keyIndex = getIndex(key);
        if (keyIndex != -1) {
            if (this.extract == TableOrder.BY_ROW) {
                result = this.source.getValue(this.index, keyIndex);
            }
            else if (this.extract == TableOrder.BY_COLUMN) {
                result = this.source.getValue(keyIndex, this.index);
            }
        }
        return result;
    }

    /**
     * Sends a {@link DatasetChangeEvent} to all registered listeners, with
     * this (not the underlying) dataset as the source.
     *
     * @param event  the event (ignored, a new event with this dataset as the
     *     source is sent to the listeners).
     */
    public void datasetChanged(DatasetChangeEvent event) {
        fireDatasetChanged();
    }

    /**
     * Tests this dataset for equality with an arbitrary object, returning
     * <code>true if obj is a dataset containing the same
     * keys and values in the same order as this dataset.
     *
     * @param obj  the object to test (<code>null permitted).
     *
     * @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;
    }

}

Other jfreechart examples (source code examples)

Here is a short list of links related to this jfreechart CategoryToPieDataset.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.