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JFreeChart is a class library, written in Java, for generating charts.
Utilising the Java2D APIs, it currently supports bar charts, pie charts,
line charts, XY-plots and time series plots.
/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-2013, 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.
*
* [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
* Other names may be trademarks of their respective owners.]
*
* ----------------------------------
* AbstractPieItemLabelGenerator.java
* ----------------------------------
* (C) Copyright 2004-2013, by Object Refinery Limited.
*
* Original Author: David Gilbert (for Object Refinery Limited);
* Contributor(s): -;
*
* Changes
* -------
* 09-Nov-2004 : Version 1, draws out code from StandardPieItemLabelGenerator
* and StandardPieToolTipGenerator (DG);
* ------------- JFREECHART 1.0.x ---------------------------------------------
* 03-May-2006 : Fixed bug 1480978, a problem in the clone() method (DG);
* 23-Nov-2007 : Implemented hashCode() (DG);
* 03-Jul-2013 : Use ParamChecks (DG);
*
*/
package org.jfree.chart.labels;
import java.io.Serializable;
import java.text.MessageFormat;
import java.text.NumberFormat;
import org.jfree.chart.HashUtilities;
import org.jfree.chart.util.ParamChecks;
import org.jfree.data.general.DatasetUtilities;
import org.jfree.data.general.PieDataset;
/**
* A base class used for generating pie chart item labels.
*/
public class AbstractPieItemLabelGenerator implements Serializable {
/** For serialization. */
private static final long serialVersionUID = 7347703325267846275L;
/** The label format string. */
private String labelFormat;
/** A number formatter for the value. */
private NumberFormat numberFormat;
/** A number formatter for the percentage. */
private NumberFormat percentFormat;
/**
* Creates an item label generator using the specified number formatters.
*
* @param labelFormat the label format string (null not
* permitted).
* @param numberFormat the format object for the values (null
* not permitted).
* @param percentFormat the format object for the percentages
* (null not permitted).
*/
protected AbstractPieItemLabelGenerator(String labelFormat,
NumberFormat numberFormat, NumberFormat percentFormat) {
ParamChecks.nullNotPermitted(labelFormat, "labelFormat");
ParamChecks.nullNotPermitted(numberFormat, "numberFormat");
ParamChecks.nullNotPermitted(percentFormat, "percentFormat");
this.labelFormat = labelFormat;
this.numberFormat = numberFormat;
this.percentFormat = percentFormat;
}
/**
* Returns the label format string.
*
* @return The label format string (never null).
*/
public String getLabelFormat() {
return this.labelFormat;
}
/**
* Returns the number formatter.
*
* @return The formatter (never null).
*/
public NumberFormat getNumberFormat() {
return this.numberFormat;
}
/**
* Returns the percent formatter.
*
* @return The formatter (never null).
*/
public NumberFormat getPercentFormat() {
return this.percentFormat;
}
/**
* Creates the array of items that can be passed to the
* {@link MessageFormat} class for creating labels. The returned array
* contains four values:
*
* - result[0] = the section key converted to a
String;
* - result[1] = the formatted data value;
* - result[2] = the formatted percentage (of the total);
* - result[3] = the formatted total value.
*
*
* @param dataset the dataset (null not permitted).
* @param key the key (null not permitted).
*
* @return The items (never null).
*/
protected Object[] createItemArray(PieDataset dataset, Comparable key) {
Object[] result = new Object[4];
double total = DatasetUtilities.calculatePieDatasetTotal(dataset);
result[0] = key.toString();
Number value = dataset.getValue(key);
if (value != null) {
result[1] = this.numberFormat.format(value);
}
else {
result[1] = "null";
}
double percent = 0.0;
if (value != null) {
double v = value.doubleValue();
if (v > 0.0) {
percent = v / total;
}
}
result[2] = this.percentFormat.format(percent);
result[3] = this.numberFormat.format(total);
return result;
}
/**
* Generates a label for a pie section.
*
* @param dataset the dataset (null not permitted).
* @param key the section key (null not permitted).
*
* @return The label (possibly null).
*/
protected String generateSectionLabel(PieDataset dataset, Comparable key) {
String result = null;
if (dataset != null) {
Object[] items = createItemArray(dataset, key);
result = MessageFormat.format(this.labelFormat, items);
}
return result;
}
/**
* Tests the generator for equality with an arbitrary object.
*
* @param obj the object to test against (null permitted).
*
* @return A boolean.
*/
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof AbstractPieItemLabelGenerator)) {
return false;
}
AbstractPieItemLabelGenerator that
= (AbstractPieItemLabelGenerator) obj;
if (!this.labelFormat.equals(that.labelFormat)) {
return false;
}
if (!this.numberFormat.equals(that.numberFormat)) {
return false;
}
if (!this.percentFormat.equals(that.percentFormat)) {
return false;
}
return true;
}
/**
* Returns a hash code for this instance.
*
* @return A hash code.
*/
@Override
public int hashCode() {
int result = 127;
result = HashUtilities.hashCode(result, this.labelFormat);
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.
*/
@Override
public Object clone() throws CloneNotSupportedException {
AbstractPieItemLabelGenerator clone
= (AbstractPieItemLabelGenerator) super.clone();
if (this.numberFormat != null) {
clone.numberFormat = (NumberFormat) this.numberFormat.clone();
}
if (this.percentFormat != null) {
clone.percentFormat = (NumberFormat) this.percentFormat.clone();
}
return clone;
}
}