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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 2000-2007, 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.]
*
* ---------------------------------
* AbstractXYItemLabelGenerator.java
* ---------------------------------
* (C) Copyright 2004-2007, by Object Refinery Limited.
*
* Original Author: David Gilbert (for Object Refinery Limited);
* Contributor(s): -;
*
* Changes
* -------
* 27-Feb-2004 : Version 1 (DG);
* 12-May-2004 : Moved default tool tip format to
* StandardXYToolTipGenerator (DG);
* 15-Jul-2004 : Switched getX() with getXValue() and getY() with
* getYValue() (DG);
* 08-Oct-2004 : Modified createItemArray() method to handle null values (DG);
* 10-Jan-2005 : Updated createItemArray() to use x, y primitives if
* possible (DG);
* ------------- JFREECHART 1.0.x --------------------------------------------
* 26-Jan-2006 : Minor API doc update (DG);
* 25-Jan-2007 : Added new constructor and fixed bug in clone() method (DG);
* 16-Oct-2007 : Removed redundant code (DG);
*
*/
package org.jfree.chart.labels;
import java.io.Serializable;
import java.text.DateFormat;
import java.text.MessageFormat;
import java.text.NumberFormat;
import java.util.Date;
import org.jfree.data.xy.XYDataset;
import org.jfree.util.ObjectUtilities;
/**
* A base class for creating item label generators.
*/
public class AbstractXYItemLabelGenerator implements Cloneable, Serializable {
/** For serialization. */
private static final long serialVersionUID = 5869744396278660636L;
/** The item label format string. */
private String formatString;
/** A number formatter for the x value. */
private NumberFormat xFormat;
/** A date formatter for the x value. */
private DateFormat xDateFormat;
/** A formatter for the y value. */
private NumberFormat yFormat;
/** A date formatter for the y value. */
private DateFormat yDateFormat;
/** The string used to represent 'null' for the y-value. */
private String nullYString = "null";
/**
* Creates an item label generator using default number formatters.
*/
protected AbstractXYItemLabelGenerator() {
this("{2}", NumberFormat.getNumberInstance(),
NumberFormat.getNumberInstance());
}
/**
* Creates an item label generator using the specified number formatters.
*
* @param formatString the item label format string (null
* not permitted).
* @param xFormat the format object for the x values (null
* not permitted).
* @param yFormat the format object for the y values (null
* not permitted).
*/
protected AbstractXYItemLabelGenerator(String formatString,
NumberFormat xFormat,
NumberFormat yFormat) {
if (formatString == null) {
throw new IllegalArgumentException("Null 'formatString' argument.");
}
if (xFormat == null) {
throw new IllegalArgumentException("Null 'xFormat' argument.");
}
if (yFormat == null) {
throw new IllegalArgumentException("Null 'yFormat' argument.");
}
this.formatString = formatString;
this.xFormat = xFormat;
this.yFormat = yFormat;
}
/**
* Creates an item label generator using the specified number formatters.
*
* @param formatString the item label format string (null
* not permitted).
* @param xFormat the format object for the x values (null
* permitted).
* @param yFormat the format object for the y values (null
* not permitted).
*/
protected AbstractXYItemLabelGenerator(String formatString,
DateFormat xFormat,
NumberFormat yFormat) {
this(formatString, NumberFormat.getInstance(), yFormat);
this.xDateFormat = xFormat;
}
/**
* Creates an item label generator using the specified formatters (a
* number formatter for the x-values and a date formatter for the
* y-values).
*
* @param formatString the item label format string (null
* not permitted).
* @param xFormat the format object for the x values (null
* permitted).
* @param yFormat the format object for the y values (null
* not permitted).
*
* @since 1.0.4
*/
protected AbstractXYItemLabelGenerator(String formatString,
NumberFormat xFormat, DateFormat yFormat) {
this(formatString, xFormat, NumberFormat.getInstance());
this.yDateFormat = yFormat;
}
/**
* Creates an item label generator using the specified number formatters.
*
* @param formatString the item label format string (null
* not permitted).
* @param xFormat the format object for the x values (null
* permitted).
* @param yFormat the format object for the y values (null
* not permitted).
*/
protected AbstractXYItemLabelGenerator(String formatString,
DateFormat xFormat,
DateFormat yFormat) {
this(formatString, NumberFormat.getInstance(),
NumberFormat.getInstance());
this.xDateFormat = xFormat;
this.yDateFormat = yFormat;
}
/**
* Returns the format string (this controls the overall structure of the
* label).
*
* @return The format string (never null).
*/
public String getFormatString() {
return this.formatString;
}
/**
* Returns the number formatter for the x-values.
*
* @return The number formatter (possibly null).
*/
public NumberFormat getXFormat() {
return this.xFormat;
}
/**
* Returns the date formatter for the x-values.
*
* @return The date formatter (possibly null).
*/
public DateFormat getXDateFormat() {
return this.xDateFormat;
}
/**
* Returns the number formatter for the y-values.
*
* @return The number formatter (possibly null).
*/
public NumberFormat getYFormat() {
return this.yFormat;
}
/**
* Returns the date formatter for the y-values.
*
* @return The date formatter (possibly null).
*/
public DateFormat getYDateFormat() {
return this.yDateFormat;
}
/**
* Generates a label string for an item in the dataset.
*
* @param dataset the dataset (null not permitted).
* @param series the series (zero-based index).
* @param item the item (zero-based index).
*
* @return The label (possibly null).
*/
public String generateLabelString(XYDataset dataset, int series, int item) {
String result = null;
Object[] items = createItemArray(dataset, series, item);
result = MessageFormat.format(this.formatString, items);
return result;
}
/**
* Creates the array of items that can be passed to the
* {@link MessageFormat} class for creating labels.
*
* @param dataset the dataset (null not permitted).
* @param series the series (zero-based index).
* @param item the item (zero-based index).
*
* @return An array of three items from the dataset formatted as
* String objects (never null).
*/
protected Object[] createItemArray(XYDataset dataset, int series,
int item) {
Object[] result = new Object[3];
result[0] = dataset.getSeriesKey(series).toString();
double x = dataset.getXValue(series, item);
if (this.xDateFormat != null) {
result[1] = this.xDateFormat.format(new Date((long) x));
}
else {
result[1] = this.xFormat.format(x);
}
double y = dataset.getYValue(series, item);
if (Double.isNaN(y) && dataset.getY(series, item) == null) {
result[2] = this.nullYString;
}
else {
if (this.yDateFormat != null) {
result[2] = this.yDateFormat.format(new Date((long) y));
}
else {
result[2] = this.yFormat.format(y);
}
}
return result;
}
/**
* Tests this object for equality with an arbitrary object.
*
* @param obj the other object (null permitted).
*
* @return A boolean.
*/
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof AbstractXYItemLabelGenerator)) {
return false;
}
AbstractXYItemLabelGenerator that = (AbstractXYItemLabelGenerator) obj;
if (!this.formatString.equals(that.formatString)) {
return false;
}
if (!ObjectUtilities.equal(this.xFormat, that.xFormat)) {
return false;
}
if (!ObjectUtilities.equal(this.xDateFormat, that.xDateFormat)) {
return false;
}
if (!ObjectUtilities.equal(this.yFormat, that.yFormat)) {
return false;
}
if (!ObjectUtilities.equal(this.yDateFormat, that.yDateFormat)) {
return false;
}
return true;
}
/**
* Returns an independent copy of the generator.
*
* @return A clone.
*
* @throws CloneNotSupportedException if cloning is not supported.
*/
public Object clone() throws CloneNotSupportedException {
AbstractXYItemLabelGenerator clone
= (AbstractXYItemLabelGenerator) super.clone();
if (this.xFormat != null) {
clone.xFormat = (NumberFormat) this.xFormat.clone();
}
if (this.yFormat != null) {
clone.yFormat = (NumberFormat) this.yFormat.clone();
}
if (this.xDateFormat != null) {
clone.xDateFormat = (DateFormat) this.xDateFormat.clone();
}
if (this.yDateFormat != null) {
clone.yDateFormat = (DateFormat) this.yDateFormat.clone();
}
return clone;
}
}
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