/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-2011, 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.]
*
* ---------------------------------------
* 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</code> 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</code> not
* permitted).
* @param formatter the number formatter (<code>null</code> 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</code> not
* permitted).
* @param formatter the number formatter (<code>null</code> not permitted).
* @param percentFormatter the percent formatter (<code>null</code> 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</code> not
* permitted).
* @param formatter the date formatter (<code>null</code> 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</code> 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</code> 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</code>).
*/
public String getLabelFormat() {
return this.labelFormat;
}
/**
* Returns the number formatter.
*
* @return The number formatter (possibly <code>null</code>).
*/
public NumberFormat getNumberFormat() {
return this.numberFormat;
}
/**
* Returns the date formatter.
*
* @return The date formatter (possibly <code>null</code>).
*/
public DateFormat getDateFormat() {
return this.dateFormat;
}
/**
* Generates a for the specified item.
*
* @param dataset the dataset (<code>null</code> not permitted).
* @param row the row index (zero-based).
* @param column the column index (zero-based).
*
* @return The label (possibly <code>null</code>).
*/
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</code> not permitted).
* @param row the row index (zero-based).
* @param column the column index (zero-based).
*
* @return The items (never <code>null</code>).
*/
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</code> 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;
}
}
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