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

jfreechart example source code file (AbstractCategoryItemLabelGenerator.java)

This example jfreechart source code file (AbstractCategoryItemLabelGenerator.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

abstractcategoryitemlabelgenerator, abstractcategoryitemlabelgenerator, clonenotsupportedexception, dateformat, illegalargumentexception, io, null, null, number, numberformat, numberformat, object, serializable, string, string, text

The jfreechart AbstractCategoryItemLabelGenerator.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.]
 *
 * ---------------------------------------
 * AbstractCategoryItemLabelGenerator.java
 * ---------------------------------------
 * (C) Copyright 2005-2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 11-May-2004 : Version 1, distilled from StandardCategoryLabelGenerator (DG);
 * 31-Jan-2005 : Added methods to return row and column labels (DG);
 * 17-May-2005 : Added percentage to item array (DG);
 * ------------- JFREECHART 1.0.x ---------------------------------------------
 * 03-May-2006 : Added new constructor (DG);
 * 23-Nov-2007 : Implemented hashCode() (DG);
 *
 */

package org.jfree.chart.labels;

import java.io.Serializable;
import java.text.DateFormat;
import java.text.MessageFormat;
import java.text.NumberFormat;

import org.jfree.chart.HashUtilities;
import org.jfree.data.DataUtilities;
import org.jfree.data.category.CategoryDataset;
import org.jfree.util.ObjectUtilities;
import org.jfree.util.PublicCloneable;

/**
 * A base class that can be used to create a label or tooltip generator that
 * can be assigned to a
 * {@link org.jfree.chart.renderer.category.CategoryItemRenderer}.
 */
public abstract class AbstractCategoryItemLabelGenerator
        implements PublicCloneable, Cloneable, Serializable {

    /** For serialization. */
    private static final long serialVersionUID = -7108591260223293197L;

    /**
     * The label format string used by a <code>MessageFormat object to
     * combine the standard items:  {0} = series name, {1} = category,
     * {2} = value, {3} = value as a percentage of the column total.
     */
    private String labelFormat;

    /** The string used to represent a null value. */
    private String nullValueString;

    /**
     * A number formatter used to preformat the value before it is passed to
     * the MessageFormat object.
     */
    private NumberFormat numberFormat;

    /**
     * A date formatter used to preformat the value before it is passed to the
     * MessageFormat object.
     */
    private DateFormat dateFormat;

    /**
     * A number formatter used to preformat the percentage value before it is
     * passed to the MessageFormat object.
     */
    private NumberFormat percentFormat;

    /**
     * Creates a label generator with the specified number formatter.
     *
     * @param labelFormat  the label format string (<code>null not
     *                     permitted).
     * @param formatter  the number formatter (<code>null not permitted).
     */
    protected AbstractCategoryItemLabelGenerator(String labelFormat,
                                                 NumberFormat formatter) {
        this(labelFormat, formatter, NumberFormat.getPercentInstance());
    }

    /**
     * Creates a label generator with the specified number formatter.
     *
     * @param labelFormat  the label format string (<code>null not
     *                     permitted).
     * @param formatter  the number formatter (<code>null not permitted).
     * @param percentFormatter  the percent formatter (<code>null not
     *     permitted).
     *
     * @since 1.0.2
     */
    protected AbstractCategoryItemLabelGenerator(String labelFormat,
            NumberFormat formatter, NumberFormat percentFormatter) {
        if (labelFormat == null) {
            throw new IllegalArgumentException("Null 'labelFormat' argument.");
        }
        if (formatter == null) {
            throw new IllegalArgumentException("Null 'formatter' argument.");
        }
        if (percentFormatter == null) {
            throw new IllegalArgumentException(
                    "Null 'percentFormatter' argument.");
        }
        this.labelFormat = labelFormat;
        this.numberFormat = formatter;
        this.percentFormat = percentFormatter;
        this.dateFormat = null;
        this.nullValueString = "-";
    }

    /**
     * Creates a label generator with the specified date formatter.
     *
     * @param labelFormat  the label format string (<code>null not
     *                     permitted).
     * @param formatter  the date formatter (<code>null not permitted).
     */
    protected AbstractCategoryItemLabelGenerator(String labelFormat,
                                                 DateFormat formatter) {
        if (labelFormat == null) {
            throw new IllegalArgumentException("Null 'labelFormat' argument.");
        }
        if (formatter == null) {
            throw new IllegalArgumentException("Null 'formatter' argument.");
        }
        this.labelFormat = labelFormat;
        this.numberFormat = null;
        this.percentFormat = NumberFormat.getPercentInstance();
        this.dateFormat = formatter;
        this.nullValueString = "-";
    }

    /**
     * Generates a label for the specified row.
     *
     * @param dataset  the dataset (<code>null not permitted).
     * @param row  the row index (zero-based).
     *
     * @return The label.
     */
    public String generateRowLabel(CategoryDataset dataset, int row) {
        return dataset.getRowKey(row).toString();
    }

    /**
     * Generates a label for the specified row.
     *
     * @param dataset  the dataset (<code>null not permitted).
     * @param column  the column index (zero-based).
     *
     * @return The label.
     */
    public String generateColumnLabel(CategoryDataset dataset, int column) {
        return dataset.getColumnKey(column).toString();
    }

    /**
     * Returns the label format string.
     *
     * @return The label format string (never <code>null).
     */
    public String getLabelFormat() {
        return this.labelFormat;
    }

    /**
     * Returns the number formatter.
     *
     * @return The number formatter (possibly <code>null).
     */
    public NumberFormat getNumberFormat() {
        return this.numberFormat;
    }

    /**
     * Returns the date formatter.
     *
     * @return The date formatter (possibly <code>null).
     */
    public DateFormat getDateFormat() {
        return this.dateFormat;
    }

    /**
     * Generates a for the specified item.
     *
     * @param dataset  the dataset (<code>null not permitted).
     * @param row  the row index (zero-based).
     * @param column  the column index (zero-based).
     *
     * @return The label (possibly <code>null).
     */
    protected String generateLabelString(CategoryDataset dataset,
                                         int row, int column) {
        if (dataset == null) {
            throw new IllegalArgumentException("Null 'dataset' argument.");
        }
        String result = null;
        Object[] items = createItemArray(dataset, row, column);
        result = MessageFormat.format(this.labelFormat, items);
        return result;

    }

    /**
     * Creates the array of items that can be passed to the
     * {@link MessageFormat} class for creating labels.
     *
     * @param dataset  the dataset (<code>null not permitted).
     * @param row  the row index (zero-based).
     * @param column  the column index (zero-based).
     *
     * @return The items (never <code>null).
     */
    protected Object[] createItemArray(CategoryDataset dataset,
                                       int row, int column) {
        Object[] result = new Object[4];
        result[0] = dataset.getRowKey(row).toString();
        result[1] = dataset.getColumnKey(column).toString();
        Number value = dataset.getValue(row, column);
        if (value != null) {
            if (this.numberFormat != null) {
                result[2] = this.numberFormat.format(value);
            }
            else if (this.dateFormat != null) {
                result[2] = this.dateFormat.format(value);
            }
        }
        else {
            result[2] = this.nullValueString;
        }
        if (value != null) {
            double total = DataUtilities.calculateColumnTotal(dataset, column);
            double percent = value.doubleValue() / total;
            result[3] = this.percentFormat.format(percent);
        }

        return result;
    }

    /**
     * Tests this object for equality with an arbitrary object.
     *
     * @param obj  the other object (<code>null permitted).
     *
     * @return A boolean.
     */
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof AbstractCategoryItemLabelGenerator)) {
            return false;
        }

        AbstractCategoryItemLabelGenerator that
            = (AbstractCategoryItemLabelGenerator) obj;
        if (!this.labelFormat.equals(that.labelFormat)) {
            return false;
        }
        if (!ObjectUtilities.equal(this.dateFormat, that.dateFormat)) {
            return false;
        }
        if (!ObjectUtilities.equal(this.numberFormat, that.numberFormat)) {
            return false;
        }
        return true;
    }

    /**
     * Returns a hash code for this instance.
     *
     * @return A hash code.
     */
    public int hashCode() {
        int result = 127;
        result = HashUtilities.hashCode(result, this.labelFormat);
        result = HashUtilities.hashCode(result, this.nullValueString);
        result = HashUtilities.hashCode(result, this.dateFormat);
        result = HashUtilities.hashCode(result, this.numberFormat);
        result = HashUtilities.hashCode(result, this.percentFormat);
        return result;
    }

    /**
     * Returns an independent copy of the generator.
     *
     * @return A clone.
     *
     * @throws CloneNotSupportedException  should not happen.
     */
    public Object clone() throws CloneNotSupportedException {
        AbstractCategoryItemLabelGenerator clone
            = (AbstractCategoryItemLabelGenerator) super.clone();
        if (this.numberFormat != null) {
            clone.numberFormat = (NumberFormat) this.numberFormat.clone();
        }
        if (this.dateFormat != null) {
            clone.dateFormat = (DateFormat) this.dateFormat.clone();
        }
        return clone;
    }

}

Other jfreechart examples (source code examples)

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