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jfreechart example source code file (StandardXYURLGenerator.java)

This example jfreechart source code file (StandardXYURLGenerator.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

default_item_parameter, default_prefix, default_series_parameter, default_series_parameter, illegalargumentexception, io, null, null, serializable, standardxyurlgenerator, standardxyurlgenerator, string, string, xyurlgenerator

The jfreechart StandardXYURLGenerator.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.]
 *
 * ---------------------------
 * StandardXYURLGenerator.java
 * ---------------------------
 * (C) Copyright 2002-2008, by Richard Atkinson and Contributors.
 *
 * Original Author:  Richard Atkinson;
 * Contributors:     David Gilbert (for Object Refinery Limited);
 *
 * Changes:
 * --------
 * 05-Aug-2002 : Version 1, contributed by Richard Atkinson;
 * 29-Aug-2002 : New constructor and member variables to customise series and
 *               item parameter names (RA);
 * 09-Oct-2002 : Fixed errors reported by Checkstyle (DG);
 * 23-Mar-2003 : Implemented Serializable (DG);
 * 01-Mar-2004 : Added equals() method (DG);
 * 13-Jan-2005 : Modified for XHTML 1.0 compliance (DG);
 * ------------- JFREECHART 1.0.x ---------------------------------------------
 * 02-Feb-2007 : Removed author tags from all over JFreeChart sources (DG);
 *
 */

package org.jfree.chart.urls;

import java.io.Serializable;

import org.jfree.data.xy.XYDataset;
import org.jfree.util.ObjectUtilities;

/**
 * A URL generator.
 */
public class StandardXYURLGenerator implements XYURLGenerator, Serializable {

    /** For serialization. */
    private static final long serialVersionUID = -1771624523496595382L;

    /** The default prefix. */
    public static final String DEFAULT_PREFIX = "index.html";

    /** The default series parameter. */
    public static final String DEFAULT_SERIES_PARAMETER = "series";

    /** The default item parameter. */
    public static final String DEFAULT_ITEM_PARAMETER = "item";

    /** Prefix to the URL */
    private String prefix;

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

    /** Item parameter name to go in each URL */
    private String itemParameterName;

    /**
     * Creates a new default generator.  This constructor is equivalent to
     * calling <code>StandardXYURLGenerator("index.html", "series", "item");
     * </code>.
     */
    public StandardXYURLGenerator() {
        this(DEFAULT_PREFIX, DEFAULT_SERIES_PARAMETER, DEFAULT_ITEM_PARAMETER);
    }

    /**
     * Creates a new generator with the specified prefix.  This constructor
     * is equivalent to calling
     * <code>StandardXYURLGenerator(prefix, "series", "item");.
     *
     * @param prefix  the prefix to the URL (<code>null not permitted).
     */
    public StandardXYURLGenerator(String prefix) {
        this(prefix, DEFAULT_SERIES_PARAMETER, DEFAULT_ITEM_PARAMETER);
    }

    /**
     * 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 itemParameterName  the name of the item parameter to go in each
     *                           URL (<code>null not permitted).
     */
    public StandardXYURLGenerator(String prefix,
                                  String seriesParameterName,
                                  String itemParameterName) {
        if (prefix == null) {
            throw new IllegalArgumentException("Null 'prefix' argument.");
        }
        if (seriesParameterName == null) {
            throw new IllegalArgumentException(
                    "Null 'seriesParameterName' argument.");
        }
        if (itemParameterName == null) {
            throw new IllegalArgumentException(
                    "Null 'itemParameterName' argument.");
        }
        this.prefix = prefix;
        this.seriesParameterName = seriesParameterName;
        this.itemParameterName = itemParameterName;
    }

    /**
     * Generates a URL for a particular item within a series.
     *
     * @param dataset  the dataset.
     * @param series  the series number (zero-based index).
     * @param item  the item number (zero-based index).
     *
     * @return The generated URL.
     */
    public String generateURL(XYDataset dataset, int series, int item) {
        // TODO: URLEncode?
        String url = this.prefix;
        boolean firstParameter = url.indexOf("?") == -1;
        url += firstParameter ? "?" : "&";
        url += this.seriesParameterName + "=" + series
                + "&" + this.itemParameterName + "=" + item;
        return url;
    }

    /**
     * Tests this 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 StandardXYURLGenerator)) {
            return false;
        }
        StandardXYURLGenerator that = (StandardXYURLGenerator) obj;
        if (!ObjectUtilities.equal(that.prefix, this.prefix)) {
            return false;
        }
        if (!ObjectUtilities.equal(that.seriesParameterName,
                this.seriesParameterName)) {
            return false;
        }
        if (!ObjectUtilities.equal(that.itemParameterName,
                this.itemParameterName)) {
            return false;
        }
        return true;
    }

}

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