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jfreechart example source code file (TimePeriodValues.java)

This example jfreechart source code file (TimePeriodValues.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

arraylist, clonenotsupportedexception, default_domain_description, default_range_description, io, number, number, object, serializable, string, string, timeperiodvalue, timeperiodvalue, timeperiodvalues, timeperiodvalues, util

The jfreechart TimePeriodValues.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.]
 *
 * ---------------------
 * TimePeriodValues.java
 * ---------------------
 * (C) Copyright 2003-2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 22-Apr-2003 : Version 1 (DG);
 * 30-Jul-2003 : Added clone and equals methods while testing (DG);
 * 11-Mar-2005 : Fixed bug in bounds recalculation - see bug report 
 *               1161329 (DG);
 * ------------- JFREECHART 1.0.x ---------------------------------------------
 * 03-Oct-2006 : Fixed NullPointerException in equals(), fire change event in 
 *               add() method, updated API docs (DG);
 * 07-Apr-2008 : Fixed bug with maxMiddleIndex in updateBounds() (DG);
 *
 */

package org.jfree.data.time;

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

import org.jfree.data.general.Series;
import org.jfree.data.general.SeriesChangeEvent;
import org.jfree.data.general.SeriesException;
import org.jfree.util.ObjectUtilities;

/**
 * A structure containing zero, one or many {@link TimePeriodValue} instances.  
 * The time periods can overlap, and are maintained in the order that they are 
 * added to the collection.
 * <p>
 * This is similar to the {@link TimeSeries} class, except that the time 
 * periods can have irregular lengths.
 */
public class TimePeriodValues extends Series implements Serializable {

    /** For serialization. */
    static final long serialVersionUID = -2210593619794989709L;
    
    /** Default value for the domain description. */
    protected static final String DEFAULT_DOMAIN_DESCRIPTION = "Time";

    /** Default value for the range description. */
    protected static final String DEFAULT_RANGE_DESCRIPTION = "Value";

    /** A description of the domain. */
    private String domain;

    /** A description of the range. */
    private String range;

    /** The list of data pairs in the series. */
    private List data;

    /** Index of the time period with the minimum start milliseconds. */
    private int minStartIndex = -1;
    
    /** Index of the time period with the maximum start milliseconds. */
    private int maxStartIndex = -1;
    
    /** Index of the time period with the minimum middle milliseconds. */
    private int minMiddleIndex = -1;
    
    /** Index of the time period with the maximum middle milliseconds. */
    private int maxMiddleIndex = -1;
    
    /** Index of the time period with the minimum end milliseconds. */
    private int minEndIndex = -1;
    
    /** Index of the time period with the maximum end milliseconds. */
    private int maxEndIndex = -1;

    /**
     * Creates a new (empty) collection of time period values.
     *
     * @param name  the name of the series (<code>null not permitted).
     */
    public TimePeriodValues(String name) {
        this(name, DEFAULT_DOMAIN_DESCRIPTION, DEFAULT_RANGE_DESCRIPTION);
    }

    /**
     * Creates a new time series that contains no data.
     * <P>
     * Descriptions can be specified for the domain and range.  One situation
     * where this is helpful is when generating a chart for the time series -
     * axis labels can be taken from the domain and range description.
     *
     * @param name  the name of the series (<code>null not permitted).
     * @param domain  the domain description.
     * @param range  the range description.
     */
    public TimePeriodValues(String name, String domain, String range) {
        super(name);
        this.domain = domain;
        this.range = range;
        this.data = new ArrayList();
    }

    /**
     * Returns the domain description.
     *
     * @return The domain description (possibly <code>null).
     * 
     * @see #getRangeDescription()
     * @see #setDomainDescription(String)
     */
    public String getDomainDescription() {
        return this.domain;
    }

    /**
     * Sets the domain description and fires a property change event (with the
     * property name <code>Domain if the description changes).
     *
     * @param description  the new description (<code>null permitted).
     * 
     * @see #getDomainDescription()
     */
    public void setDomainDescription(String description) {
        String old = this.domain;
        this.domain = description;
        firePropertyChange("Domain", old, description);
    }

    /**
     * Returns the range description.
     *
     * @return The range description (possibly <code>null).
     * 
     * @see #getDomainDescription()
     * @see #setRangeDescription(String)
     */
    public String getRangeDescription() {
        return this.range;
    }

    /**
     * Sets the range description and fires a property change event with the
     * name <code>Range.
     *
     * @param description  the new description (<code>null permitted).
     * 
     * @see #getRangeDescription()
     */
    public void setRangeDescription(String description) {
        String old = this.range;
        this.range = description;
        firePropertyChange("Range", old, description);
    }

    /**
     * Returns the number of items in the series.
     *
     * @return The item count.
     */
    public int getItemCount() {
        return this.data.size();
    }

    /**
     * Returns one data item for the series.
     *
     * @param index  the item index (in the range <code>0 to 
     *     <code>getItemCount() - 1).
     *
     * @return One data item for the series.
     */
    public TimePeriodValue getDataItem(int index) {
        return (TimePeriodValue) this.data.get(index);
    }

    /**
     * Returns the time period at the specified index.
     *
     * @param index  the item index (in the range <code>0 to 
     *     <code>getItemCount() - 1).
     *
     * @return The time period at the specified index.
     * 
     * @see #getDataItem(int)
     */
    public TimePeriod getTimePeriod(int index) {
        return getDataItem(index).getPeriod();
    }

    /**
     * Returns the value at the specified index.
     *
     * @param index  the item index (in the range <code>0 to 
     *     <code>getItemCount() - 1).
     *
     * @return The value at the specified index (possibly <code>null).
     * 
     * @see #getDataItem(int)
     */
    public Number getValue(int index) {
        return getDataItem(index).getValue();
    }

    /**
     * Adds a data item to the series and sends a {@link SeriesChangeEvent} to
     * all registered listeners.
     *
     * @param item  the item (<code>null not permitted).
     */
    public void add(TimePeriodValue item) {
        if (item == null) {
            throw new IllegalArgumentException("Null item not allowed.");
        }
        this.data.add(item);
        updateBounds(item.getPeriod(), this.data.size() - 1);
        fireSeriesChanged();
    }
    
    /**
     * Update the index values for the maximum and minimum bounds.
     * 
     * @param period  the time period.
     * @param index  the index of the time period.
     */
    private void updateBounds(TimePeriod period, int index) {
        
        long start = period.getStart().getTime();
        long end = period.getEnd().getTime();
        long middle = start + ((end - start) / 2);

        if (this.minStartIndex >= 0) {
            long minStart = getDataItem(this.minStartIndex).getPeriod()
                .getStart().getTime();
            if (start < minStart) {
                this.minStartIndex = index;           
            }
        }
        else {
            this.minStartIndex = index;
        }
        
        if (this.maxStartIndex >= 0) {
            long maxStart = getDataItem(this.maxStartIndex).getPeriod()
                .getStart().getTime();
            if (start > maxStart) {
                this.maxStartIndex = index;           
            }
        }
        else {
            this.maxStartIndex = index;
        }
        
        if (this.minMiddleIndex >= 0) {
            long s = getDataItem(this.minMiddleIndex).getPeriod().getStart()
                .getTime();
            long e = getDataItem(this.minMiddleIndex).getPeriod().getEnd()
                .getTime();
            long minMiddle = s + (e - s) / 2;
            if (middle < minMiddle) {
                this.minMiddleIndex = index;           
            }
        }
        else {
            this.minMiddleIndex = index;
        }
        
        if (this.maxMiddleIndex >= 0) {
            long s = getDataItem(this.maxMiddleIndex).getPeriod().getStart()
                .getTime();
            long e = getDataItem(this.maxMiddleIndex).getPeriod().getEnd()
                .getTime();
            long maxMiddle = s + (e - s) / 2;
            if (middle > maxMiddle) {
                this.maxMiddleIndex = index;           
            }
        }
        else {
            this.maxMiddleIndex = index;
        }
        
        if (this.minEndIndex >= 0) {
            long minEnd = getDataItem(this.minEndIndex).getPeriod().getEnd()
                .getTime();
            if (end < minEnd) {
                this.minEndIndex = index;           
            }
        }
        else {
            this.minEndIndex = index;
        }
       
        if (this.maxEndIndex >= 0) {
            long maxEnd = getDataItem(this.maxEndIndex).getPeriod().getEnd()
                .getTime();
            if (end > maxEnd) {
                this.maxEndIndex = index;           
            }
        }
        else {
            this.maxEndIndex = index;
        }
        
    }
    
    /**
     * Recalculates the bounds for the collection of items.
     */
    private void recalculateBounds() {
        this.minStartIndex = -1;
        this.minMiddleIndex = -1;
        this.minEndIndex = -1;
        this.maxStartIndex = -1;
        this.maxMiddleIndex = -1;
        this.maxEndIndex = -1;
        for (int i = 0; i < this.data.size(); i++) {
            TimePeriodValue tpv = (TimePeriodValue) this.data.get(i);
            updateBounds(tpv.getPeriod(), i);
        }
    }

    /**
     * Adds a new data item to the series and sends a {@link SeriesChangeEvent}
     * to all registered listeners.
     *
     * @param period  the time period (<code>null not permitted).
     * @param value  the value.
     * 
     * @see #add(TimePeriod, Number)
     */
    public void add(TimePeriod period, double value) {
        TimePeriodValue item = new TimePeriodValue(period, value);
        add(item);
    }

    /**
     * Adds a new data item to the series and sends a {@link SeriesChangeEvent}
     * to all registered listeners.
     *
     * @param period  the time period (<code>null not permitted).
     * @param value  the value (<code>null permitted).
     */
    public void add(TimePeriod period, Number value) {
        TimePeriodValue item = new TimePeriodValue(period, value);
        add(item);
    }

    /**
     * Updates (changes) the value of a data item and sends a 
     * {@link SeriesChangeEvent} to all registered listeners.
     *
     * @param index  the index of the data item to update.
     * @param value  the new value (<code>null not permitted).
     */
    public void update(int index, Number value) {
        TimePeriodValue item = getDataItem(index);
        item.setValue(value);
        fireSeriesChanged();
    }

    /**
     * Deletes data from start until end index (end inclusive) and sends a
     * {@link SeriesChangeEvent} to all registered listeners.
     *
     * @param start  the index of the first period to delete.
     * @param end  the index of the last period to delete.
     */
    public void delete(int start, int end) {
        for (int i = 0; i <= (end - start); i++) {
            this.data.remove(start);
        }
        recalculateBounds();
        fireSeriesChanged();
    }
    
    /**
     * Tests the series for equality with another object.
     *
     * @param obj  the object (<code>null permitted).
     *
     * @return <code>true or false.
     */
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof TimePeriodValues)) {
            return false;
        }
        if (!super.equals(obj)) {
            return false;
        }
        TimePeriodValues that = (TimePeriodValues) obj;
        if (!ObjectUtilities.equal(this.getDomainDescription(), 
                that.getDomainDescription())) {
            return false;
        }
        if (!ObjectUtilities.equal(this.getRangeDescription(), 
                that.getRangeDescription())) {
            return false;
        }
        int count = getItemCount();
        if (count != that.getItemCount()) {
            return false;
        }
        for (int i = 0; i < count; i++) {
            if (!getDataItem(i).equals(that.getDataItem(i))) {
                return false;
            }
        }
        return true;
    }

    /**
     * Returns a hash code value for the object.
     *
     * @return The hashcode
     */
    public int hashCode() {
        int result;
        result = (this.domain != null ? this.domain.hashCode() : 0);
        result = 29 * result + (this.range != null ? this.range.hashCode() : 0);
        result = 29 * result + this.data.hashCode();
        result = 29 * result + this.minStartIndex;
        result = 29 * result + this.maxStartIndex;
        result = 29 * result + this.minMiddleIndex;
        result = 29 * result + this.maxMiddleIndex;
        result = 29 * result + this.minEndIndex;
        result = 29 * result + this.maxEndIndex;
        return result;
    }

    /**
     * Returns a clone of the collection.
     * <P>
     * Notes:
     * <ul>
     *   <li>no need to clone the domain and range descriptions, since String 
     *       object is immutable;</li>
     *   <li>we pass over to the more general method createCopy(start, end).
     *   </li>
     * </ul>
     *
     * @return A clone of the time series.
     * 
     * @throws CloneNotSupportedException if there is a cloning problem.
     */
    public Object clone() throws CloneNotSupportedException {
        Object clone = createCopy(0, getItemCount() - 1);
        return clone;
    }

    /**
     * Creates a new instance by copying a subset of the data in this 
     * collection.
     *
     * @param start  the index of the first item to copy.
     * @param end  the index of the last item to copy.
     *
     * @return A copy of a subset of the items.
     * 
     * @throws CloneNotSupportedException if there is a cloning problem.
     */
    public TimePeriodValues createCopy(int start, int end) 
        throws CloneNotSupportedException {

        TimePeriodValues copy = (TimePeriodValues) super.clone();

        copy.data = new ArrayList();
        if (this.data.size() > 0) {
            for (int index = start; index <= end; index++) {
                TimePeriodValue item = (TimePeriodValue) this.data.get(index);
                TimePeriodValue clone = (TimePeriodValue) item.clone();
                try {
                    copy.add(clone);
                }
                catch (SeriesException e) {
                    System.err.println("Failed to add cloned item.");
                }
            }
        }
        return copy;

    }
    
    /**
     * Returns the index of the time period with the minimum start milliseconds.
     * 
     * @return The index.
     */
    public int getMinStartIndex() {
        return this.minStartIndex;
    }
    
    /**
     * Returns the index of the time period with the maximum start milliseconds.
     * 
     * @return The index.
     */
    public int getMaxStartIndex() {
        return this.maxStartIndex;
    }

    /**
     * Returns the index of the time period with the minimum middle 
     * milliseconds.
     * 
     * @return The index.
     */
    public int getMinMiddleIndex() {
        return this.minMiddleIndex;
    }
    
    /**
     * Returns the index of the time period with the maximum middle 
     * milliseconds.
     * 
     * @return The index.
     */
    public int getMaxMiddleIndex() {
        return this.maxMiddleIndex;
    }

    /**
     * Returns the index of the time period with the minimum end milliseconds.
     * 
     * @return The index.
     */
    public int getMinEndIndex() {
        return this.minEndIndex;
    }
    
    /**
     * Returns the index of the time period with the maximum end milliseconds.
     * 
     * @return The index.
     */
    public int getMaxEndIndex() {
        return this.maxEndIndex;
    }

}

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