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jfreechart example source code file (StandardCategoryURLGenerator.java)

This example jfreechart source code file (StandardCategoryURLGenerator.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

categoryurlgenerator, clonenotsupportedexception, comparable, illegalargumentexception, illegalargumentexception, io, null, null, object, serializable, standardcategoryurlgenerator, standardcategoryurlgenerator, string, string, utf-8

The jfreechart StandardCategoryURLGenerator.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.]
 *
 * ---------------------------------
 * StandardCategoryURLGenerator.java
 * ---------------------------------
 * (C) Copyright 2002-2008, by Richard Atkinson and Contributors.
 *
 * Original Author:  Richard Atkinson;
 * Contributors:     David Gilbert (for Object Refinery Limited);
 *                   Cleland Early;
 *
 * Changes:
 * --------
 * 05-Aug-2002 : Version 1, contributed by Richard Atkinson;
 * 29-Aug-2002 : Reversed seriesParameterName and itemParameterName in
 *               constructor.  Never should have been the other way round.
 *               Also updated JavaDoc (RA);
 * 09-Oct-2002 : Fixed errors reported by Checkstyle (DG);
 * 05-Nov-2002 : Base dataset is now TableDataset not CategoryDataset (DG);
 * 23-Mar-2003 : Implemented Serializable (DG);
 * 13-Aug-2003 : Implemented Cloneable (DG);
 * 23-Dec-2003 : Added fix for bug 861282 (DG);
 * 21-May-2004 : Added URL encoding - see patch 947854 (DG);
 * 13-Jan-2004 : Fixed for compliance with XHTML 1.0 (DG);
 * ------------- JFREECHART 1.0.x ---------------------------------------------
 * 02-Feb-2007 : Removed author tags from all over JFreeChart sources (DG);
 * 17-Apr-2007 : Use new URLUtilities class to encode URLs (DG);
 *
 */

package org.jfree.chart.urls;

import java.io.Serializable;

import org.jfree.data.category.CategoryDataset;
import org.jfree.util.ObjectUtilities;

/**
 * A URL generator that can be assigned to a
 * {@link org.jfree.chart.renderer.category.CategoryItemRenderer}.
 */
public class StandardCategoryURLGenerator implements CategoryURLGenerator,
        Cloneable, Serializable {

    /** For serialization. */
    private static final long serialVersionUID = 2276668053074881909L;

    /** Prefix to the URL */
    private String prefix = "index.html";

    /** Series parameter name to go in each URL */
    private String seriesParameterName = "series";

    /** Category parameter name to go in each URL */
    private String categoryParameterName = "category";

    /**
     * Creates a new generator with default settings.
     */
    public StandardCategoryURLGenerator() {
        super();
    }

    /**
     * Constructor that overrides default prefix to the URL.
     *
     * @param prefix  the prefix to the URL (<code>null not permitted).
     */
    public StandardCategoryURLGenerator(String prefix) {
        if (prefix == null) {
            throw new IllegalArgumentException("Null 'prefix' argument.");
        }
        this.prefix = prefix;
    }

    /**
     * Constructor that overrides all the defaults.
     *
     * @param prefix  the prefix to the URL (<code>null not permitted).
     * @param seriesParameterName  the name of the series parameter to go in
     *                             each URL (<code>null not permitted).
     * @param categoryParameterName  the name of the category parameter to go in
     *                               each URL (<code>null not permitted).
     */
    public StandardCategoryURLGenerator(String prefix,
                                        String seriesParameterName,
                                        String categoryParameterName) {

        if (prefix == null) {
            throw new IllegalArgumentException("Null 'prefix' argument.");
        }
        if (seriesParameterName == null) {
            throw new IllegalArgumentException(
                    "Null 'seriesParameterName' argument.");
        }
        if (categoryParameterName == null) {
            throw new IllegalArgumentException(
                    "Null 'categoryParameterName' argument.");
        }
        this.prefix = prefix;
        this.seriesParameterName = seriesParameterName;
        this.categoryParameterName = categoryParameterName;

    }

    /**
     * Generates a URL for a particular item within a series.
     *
     * @param dataset  the dataset.
     * @param series  the series index (zero-based).
     * @param category  the category index (zero-based).
     *
     * @return The generated URL.
     */
    public String generateURL(CategoryDataset dataset, int series,
                              int category) {
        String url = this.prefix;
        Comparable seriesKey = dataset.getRowKey(series);
        Comparable categoryKey = dataset.getColumnKey(category);
        boolean firstParameter = url.indexOf("?") == -1;
        url += firstParameter ? "?" : "&";
        url += this.seriesParameterName + "=" + URLUtilities.encode(
                seriesKey.toString(), "UTF-8");
        url += "&" + this.categoryParameterName + "="
                + URLUtilities.encode(categoryKey.toString(), "UTF-8");
        return url;
    }

    /**
     * Returns an independent copy of the URL generator.
     *
     * @return A clone.
     *
     * @throws CloneNotSupportedException not thrown by this class, but
     *         subclasses (if any) might.
     */
    public Object clone() throws CloneNotSupportedException {
        // all attributes are immutable, so we can just return the super.clone()
        // FIXME: in fact, the generator itself is immutable, so cloning is
        // not necessary
        return super.clone();
    }

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

        if (!ObjectUtilities.equal(this.seriesParameterName,
                that.seriesParameterName)) {
            return false;
        }
        if (!ObjectUtilities.equal(this.categoryParameterName,
                that.categoryParameterName)) {
            return false;
        }
        return true;
    }

    /**
     * Returns a hash code.
     *
     * @return A hash code.
     */
    public int hashCode() {
        int result;
        result = (this.prefix != null ? this.prefix.hashCode() : 0);
        result = 29 * result
            + (this.seriesParameterName != null
                    ? this.seriesParameterName.hashCode() : 0);
        result = 29 * result
            + (this.categoryParameterName != null
                    ? this.categoryParameterName.hashCode() : 0);
        return result;
    }

}

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