timeperiodvalues.java

Web图形化的Java库

/* ======================================
 * JFreeChart : a free Java chart library
 * ======================================
 *
 * Project Info:  http://www.jfree.org/jfreechart/index.html
 * Project Lead:  David Gilbert ([e-mail]);
 *
 * (C) Copyright 2000-2003, by Object Refinery Limited and Contributors.  All rights reserved.
 *
 * 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.
 *
 * ---------------------
 * TimePeriodValues.java
 * ---------------------
 * (C) Copyright 2003, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * $Id: TimePeriodValues.java,v 1.7 2003/09/03 15:08:52 mungady Exp $
 *
 * Changes
 * -------
 * 22-Apr-2003 : Version 1 (DG);
 * 30-Jul-2003 : Added clone and equals methods while testing (DG);
 *
 */

package org.jfree.data.time;

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

import org.jfree.data.Series;
import org.jfree.data.SeriesException;

/**
 * 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.
 * 
 * @author David Gilbert
 */
public class TimePeriodValues extends Series implements Serializable {

    /** 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.
     */
    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.
     * @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;
        data = new java.util.ArrayList();

    }

    /**
     * Returns the domain description.
     *
     * @return the domain description.
     */
    public String getDomainDescription() {
        return this.domain;
    }

    /**
     * Sets the domain description.
     * <P>
     * A property change event is fired, and an undoable edit is posted.
     *
     * @param description  the new description.
     */
    public void setDomainDescription(String description) {

        String old = this.domain;
        this.domain = description;
        firePropertyChange("Domain", old, description);

    }

    /**
     * Returns the range description.
     *
     * @return the range description.
     */
    public String getRangeDescription() {
        return this.range;
    }

    /**
     * Sets the range description.
     * <P>
     * Registered listeners are notified of the change.
     *
     * @param description  the new description.
     */
    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 data.size();
    }

    /**
     * Returns one data item for the series.
     *
     * @param index  the item index (zero-based).
     *
     * @return one data item for the series.
     */
    public TimePeriodValue getDataItem(int index) {

        return (TimePeriodValue) data.get(index);

    }

    /**
     * Returns the time period at the specified index.
     *
     * @param index  the index of the data pair.
     *
     * @return the time period at the specified index.
     */
    public TimePeriod getTimePeriod(int index) {
        return getDataItem(index).getPeriod();
    }

    /**
     * Returns the value at the specified index.
     *
     * @param index  index of a value.
     *
     * @return the value at the specified index.
     */
    public Number getValue(int index) {
        return getDataItem(index).getValue();
    }

    /**
     * Adds a data item to the series.
     *
     * @param item  the (timeperiod, value) pair.
     *
     * @throws SeriesException if there is a problem adding the data.
     */
    public void add(TimePeriodValue item) throws SeriesException {

        // check arguments...
        if (item == null) {
            throw new IllegalArgumentException("TimePeriodValues.add(...): null item not allowed.");
        }

        // make the change
        this.data.add(item);
        updateBounds(item.getPeriod(), this.data.size() - 1);

    }
    
    /**
     * 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;