intervalcategorylabelgenerator.java

jfreechart安装程序和使用说明

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2004, 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., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
 * in the United States and other countries.]
 *
 * -----------------------------------
 * IntervalCategoryLabelGenerator.java
 * -----------------------------------
 * (C) Copyright 2004, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * $Id: IntervalCategoryLabelGenerator.java,v 1.1 2004/08/31 14:36:24 mungady Exp $
 *
 * Changes
 * -------
 * 11-May-2004 : Version 1, split from IntervalCategoryItemLabelGenerator (DG);
 *
 */

package org.jfree.chart.labels;

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

import org.jfree.data.category.CategoryDataset;
import org.jfree.data.category.IntervalCategoryDataset;
import org.jfree.util.PublicCloneable;

/**
 * A label generator for plots that use data from an {@link IntervalCategoryDataset}.
 */
public class IntervalCategoryLabelGenerator extends StandardCategoryLabelGenerator
                                            implements CategoryLabelGenerator,
                                                       PublicCloneable,
                                                       Cloneable,
                                                       Serializable {

    /** The default format string. */
    public static final String DEFAULT_LABEL_FORMAT_STRING = "({0}, {1}) = {3} - {4}";
    
    /**
     * Creates a new generator with a default number formatter.
     */
    public IntervalCategoryLabelGenerator() {
        super(DEFAULT_LABEL_FORMAT_STRING, NumberFormat.getInstance());
    }

    /**
     * Creates a new 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).
     */
    public IntervalCategoryLabelGenerator(String labelFormat, NumberFormat formatter) {
        super(labelFormat, formatter);
    }
    
    /**
     * Creates a new 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).
     */
    public IntervalCategoryLabelGenerator(String labelFormat, DateFormat formatter) {
        super(labelFormat, formatter);
    }
    
    /**
     * Creates the array of items that can be passed to the <code>MessageFormat</code> 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[5];
        result[0] = dataset.getRowKey(row).toString();
        result[1] = dataset.getColumnKey(column).toString();
        Number value = dataset.getValue(row, column);
        if (getNumberFormat() != null) {
            result[2] = getNumberFormat().format(value);  
        }
        else if (getDateFormat() != null) {
            result[2] = getDateFormat().format(value);
        }
        
        if (dataset instanceof IntervalCategoryDataset) {
            IntervalCategoryDataset icd = (IntervalCategoryDataset) dataset;
            Number start = icd.getStartValue(row, column);
            Number end = icd.getEndValue(row, column);
            if (getNumberFormat() != null) {
                result[3] = getNumberFormat().format(start);  
                result[4] = getNumberFormat().format(end);  
            }
            else if (getDateFormat() != null) {
                result[3] = getDateFormat().format(start);
                result[4] = getDateFormat().format(end);
            }
        }
        return result;
    }

}