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jfreechart example source code file (Task.java)

This example jfreechart source code file (Task.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

clonenotsupportedexception, date, double, illegalargumentexception, illegalargumentexception, io, null, null, serializable, simpletimeperiod, string, task, task, timeperiod, timeperiod, util

The jfreechart Task.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.]
 *
 * ---------
 * Task.java
 * ---------
 * (C) Copyright 2003-2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 10-Jan-2003 : Version 1 (DG);
 * 16-Sep-2003 : Added percentage complete (DG);
 * 30-Jul-2004 : Added clone() and equals() methods and implemented
 *               Serializable (DG);
 *
 */

package org.jfree.data.gantt;

import java.io.Serializable;
import java.util.Date;
import java.util.List;

import org.jfree.data.time.SimpleTimePeriod;
import org.jfree.data.time.TimePeriod;
import org.jfree.util.ObjectUtilities;
import org.jfree.util.PublicCloneable;

/**
 * A simple representation of a task.  The task has a description and a
 * duration.  You can add sub-tasks to the task.
 */
public class Task implements Cloneable, PublicCloneable, Serializable {

    /** For serialization. */
    private static final long serialVersionUID = 1094303785346988894L;

    /** The task description. */
    private String description;

    /** The time period for the task (estimated or actual). */
    private TimePeriod duration;

    /** The percent complete (<code>null is permitted). */
    private Double percentComplete;

    /** Storage for the sub-tasks (if any). */
    private List subtasks;

    /**
     * Creates a new task.
     *
     * @param description  the task description (<code>null not
     *                     permitted).
     * @param duration  the task duration (<code>null permitted).
     */
    public Task(String description, TimePeriod duration) {
        if (description == null) {
            throw new IllegalArgumentException("Null 'description' argument.");
        }
        this.description = description;
        this.duration = duration;
        this.percentComplete = null;
        this.subtasks = new java.util.ArrayList();
    }

    /**
     * Creates a new task.
     *
     * @param description  the task description (<code>null not
     *                     permitted).
     * @param start  the start date (<code>null not permitted).
     * @param end  the end date (<code>null not permitted).
     */
    public Task(String description, Date start, Date end) {
        this(description, new SimpleTimePeriod(start, end));
    }

    /**
     * Returns the task description.
     *
     * @return The task description (never <code>null).
     */
    public String getDescription() {
        return this.description;
    }

    /**
     * Sets the task description.
     *
     * @param description  the description (<code>null not permitted).
     */
    public void setDescription(String description) {
        if (description == null) {
            throw new IllegalArgumentException("Null 'description' argument.");
        }
        this.description = description;
    }

    /**
     * Returns the duration (actual or estimated) of the task.
     *
     * @return The task duration (possibly <code>null).
     */
    public TimePeriod getDuration() {
        return this.duration;
    }

    /**
     * Sets the task duration (actual or estimated).
     *
     * @param duration  the duration (<code>null permitted).
     */
    public void setDuration(TimePeriod duration) {
        this.duration = duration;
    }

    /**
     * Returns the percentage complete for this task.
     *
     * @return The percentage complete (possibly <code>null).
     */
    public Double getPercentComplete() {
        return this.percentComplete;
    }

    /**
     * Sets the percentage complete for the task.
     *
     * @param percent  the percentage (<code>null permitted).
     */
    public void setPercentComplete(Double percent) {
        this.percentComplete = percent;
    }

    /**
     * Sets the percentage complete for the task.
     *
     * @param percent  the percentage.
     */
    public void setPercentComplete(double percent) {
        setPercentComplete(new Double(percent));
    }

    /**
     * Adds a sub-task to the task.
     *
     * @param subtask  the subtask (<code>null not permitted).
     */
    public void addSubtask(Task subtask) {
        if (subtask == null) {
            throw new IllegalArgumentException("Null 'subtask' argument.");
        }
        this.subtasks.add(subtask);
    }

    /**
     * Removes a sub-task from the task.
     *
     * @param subtask  the subtask.
     */
    public void removeSubtask(Task subtask) {
        this.subtasks.remove(subtask);
    }

    /**
     * Returns the sub-task count.
     *
     * @return The sub-task count.
     */
    public int getSubtaskCount() {
        return this.subtasks.size();
    }

    /**
     * Returns a sub-task.
     *
     * @param index  the index.
     *
     * @return The sub-task.
     */
    public Task getSubtask(int index) {
        return (Task) this.subtasks.get(index);
    }

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

    /**
     * Returns a clone of the task.
     *
     * @return A clone.
     *
     * @throws CloneNotSupportedException  never thrown by this class, but
     *         subclasses may not support cloning.
     */
    public Object clone() throws CloneNotSupportedException {
        Task clone = (Task) super.clone();
        return clone;
    }

}

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