Java tutorial
/* =========================================================== * JFreeChart : a free chart library for the Java(tm) platform * =========================================================== * * (C) Copyright 2000-2013, 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. * * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. * Other names may be trademarks of their respective owners.] * * -------------------------- * DefaultHighLowDataset.java * -------------------------- * (C) Copyright 2002-2013, by Object Refinery Limited. * * Original Author: David Gilbert (for Object Refinery Limited); * Contributor(s): -; * * Changes * ------- * 21-Mar-2002 : Version 1 (DG); * 07-Oct-2002 : Fixed errors reported by Checkstyle (DG); * 06-May-2004 : Now extends AbstractXYDataset and added new methods from * HighLowDataset (DG); * 15-Jul-2004 : Switched getX() with getXValue() and getY() with * getYValue() (DG); * ------------- JFREECHART 1.0.x --------------------------------------------- * 28-Nov-2006 : Added equals() method override (DG); * 22-Apr-2008 : Implemented PublicCloneable (DG); * 03-Jul-2013 : Use ParamChecks (DG); * */ package org.jfree.data.xy; import java.util.Arrays; import java.util.Date; import org.jfree.chart.util.ParamChecks; import org.jfree.util.PublicCloneable; /** * A simple implementation of the {@link OHLCDataset} interface. See also * the {@link DefaultOHLCDataset} class, which provides another implementation * that is very similar. */ public class DefaultHighLowDataset extends AbstractXYDataset implements OHLCDataset, PublicCloneable { /** The series key. */ private Comparable seriesKey; /** Storage for the dates. */ private Date[] date; /** Storage for the high values. */ private Number[] high; /** Storage for the low values. */ private Number[] low; /** Storage for the open values. */ private Number[] open; /** Storage for the close values. */ private Number[] close; /** Storage for the volume values. */ private Number[] volume; /** * Constructs a new high/low/open/close dataset. * <p> * The current implementation allows only one series in the dataset. * This may be extended in a future version. * * @param seriesKey the key for the series (<code>null</code> not * permitted). * @param date the dates (<code>null</code> not permitted). * @param high the high values (<code>null</code> not permitted). * @param low the low values (<code>null</code> not permitted). * @param open the open values (<code>null</code> not permitted). * @param close the close values (<code>null</code> not permitted). * @param volume the volume values (<code>null</code> not permitted). */ public DefaultHighLowDataset(Comparable seriesKey, Date[] date, double[] high, double[] low, double[] open, double[] close, double[] volume) { ParamChecks.nullNotPermitted(seriesKey, "seriesKey"); ParamChecks.nullNotPermitted(date, "date"); this.seriesKey = seriesKey; this.date = date; this.high = createNumberArray(high); this.low = createNumberArray(low); this.open = createNumberArray(open); this.close = createNumberArray(close); this.volume = createNumberArray(volume); } /** * Returns the key for the series stored in this dataset. * * @param series the index of the series (ignored, this dataset supports * only one series and this method always returns the key for series 0). * * @return The series key (never <code>null</code>). */ @Override public Comparable getSeriesKey(int series) { return this.seriesKey; } /** * Returns the x-value for one item in a series. The value returned is a * <code>Long</code> instance generated from the underlying * <code>Date</code> object. To avoid generating a new object instance, * you might prefer to call {@link #getXValue(int, int)}. * * @param series the series (zero-based index). * @param item the item (zero-based index). * * @return The x-value. * * @see #getXValue(int, int) * @see #getXDate(int, int) */ @Override public Number getX(int series, int item) { return new Long(this.date[item].getTime()); } /** * Returns the x-value for one item in a series, as a Date. * <p> * This method is provided for convenience only. * * @param series the series (zero-based index). * @param item the item (zero-based index). * * @return The x-value as a Date. * * @see #getX(int, int) */ public Date getXDate(int series, int item) { return this.date[item]; } /** * Returns the y-value for one item in a series. * <p> * This method (from the {@link XYDataset} interface) is mapped to the * {@link #getCloseValue(int, int)} method. * * @param series the series (zero-based index). * @param item the item (zero-based index). * * @return The y-value. * * @see #getYValue(int, int) */ @Override public Number getY(int series, int item) { return getClose(series, item); } /** * Returns the high-value for one item in a series. * * @param series the series (zero-based index). * @param item the item (zero-based index). * * @return The high-value. * * @see #getHighValue(int, int) */ @Override public Number getHigh(int series, int item) { return this.high[item]; } /** * Returns the high-value (as a double primitive) for an item within a * series. * * @param series the series (zero-based index). * @param item the item (zero-based index). * * @return The high-value. * * @see #getHigh(int, int) */ @Override public double getHighValue(int series, int item) { double result = Double.NaN; Number h = getHigh(series, item); if (h != null) { result = h.doubleValue(); } return result; } /** * Returns the low-value for one item in a series. * * @param series the series (zero-based index). * @param item the item (zero-based index). * * @return The low-value. * * @see #getLowValue(int, int) */ @Override public Number getLow(int series, int item) { return this.low[item]; } /** * Returns the low-value (as a double primitive) for an item within a * series. * * @param series the series (zero-based index). * @param item the item (zero-based index). * * @return The low-value. * * @see #getLow(int, int) */ @Override public double getLowValue(int series, int item) { double result = Double.NaN; Number l = getLow(series, item); if (l != null) { result = l.doubleValue(); } return result; } /** * Returns the open-value for one item in a series. * * @param series the series (zero-based index). * @param item the item (zero-based index). * * @return The open-value. * * @see #getOpenValue(int, int) */ @Override public Number getOpen(int series, int item) { return this.open[item]; } /** * Returns the open-value (as a double primitive) for an item within a * series. * * @param series the series (zero-based index). * @param item the item (zero-based index). * * @return The open-value. * * @see #getOpen(int, int) */ @Override public double getOpenValue(int series, int item) { double result = Double.NaN; Number open = getOpen(series, item); if (open != null) { result = open.doubleValue(); } return result; } /** * Returns the close-value for one item in a series. * * @param series the series (zero-based index). * @param item the item (zero-based index). * * @return The close-value. * * @see #getCloseValue(int, int) */ @Override public Number getClose(int series, int item) { return this.close[item]; } /** * Returns the close-value (as a double primitive) for an item within a * series. * * @param series the series (zero-based index). * @param item the item (zero-based index). * * @return The close-value. * * @see #getClose(int, int) */ @Override public double getCloseValue(int series, int item) { double result = Double.NaN; Number c = getClose(series, item); if (c != null) { result = c.doubleValue(); } return result; } /** * Returns the volume-value for one item in a series. * * @param series the series (zero-based index). * @param item the item (zero-based index). * * @return The volume-value. * * @see #getVolumeValue(int, int) */ @Override public Number getVolume(int series, int item) { return this.volume[item]; } /** * Returns the volume-value (as a double primitive) for an item within a * series. * * @param series the series (zero-based index). * @param item the item (zero-based index). * * @return The volume-value. * * @see #getVolume(int, int) */ @Override public double getVolumeValue(int series, int item) { double result = Double.NaN; Number v = getVolume(series, item); if (v != null) { result = v.doubleValue(); } return result; } /** * Returns the number of series in the dataset. * <p> * This implementation only allows one series. * * @return The number of series. */ @Override public int getSeriesCount() { return 1; } /** * Returns the number of items in the specified series. * * @param series the index (zero-based) of the series. * * @return The number of items in the specified series. */ @Override public int getItemCount(int series) { return this.date.length; } /** * Tests this dataset for equality with an arbitrary instance. * * @param obj the object (<code>null</code> permitted). * * @return A boolean. */ @Override public boolean equals(Object obj) { if (obj == this) { return true; } if (!(obj instanceof DefaultHighLowDataset)) { return false; } DefaultHighLowDataset that = (DefaultHighLowDataset) obj; if (!this.seriesKey.equals(that.seriesKey)) { return false; } if (!Arrays.equals(this.date, that.date)) { return false; } if (!Arrays.equals(this.open, that.open)) { return false; } if (!Arrays.equals(this.high, that.high)) { return false; } if (!Arrays.equals(this.low, that.low)) { return false; } if (!Arrays.equals(this.close, that.close)) { return false; } if (!Arrays.equals(this.volume, that.volume)) { return false; } return true; } /** * Constructs an array of Number objects from an array of doubles. * * @param data the double values to convert (<code>null</code> not * permitted). * * @return The data as an array of Number objects. */ public static Number[] createNumberArray(double[] data) { Number[] result = new Number[data.length]; for (int i = 0; i < data.length; i++) { result[i] = new Double(data[i]); } return result; } }