/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-2011, 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.]
*
* --------------
* XYDataset.java
* --------------
* (C) Copyright 2000-2008, by Object Refinery Limited.
*
* Original Author: David Gilbert (for Object Refinery Limited);
* Contributor(s): -;
*
* Changes (from 18-Sep-2001)
* --------------------------
* 18-Sep-2001 : Added standard header and fixed DOS encoding problem (DG);
* 15-Oct-2001 : Moved to a new package (com.jrefinery.data.*) (DG);
* 22-Oct-2001 : Renamed DataSource.java --> Dataset.java etc. (DG);
* 17-Nov-2001 : Now extends SeriesDataset (DG);
* 15-Jul-2004 : Switched getX() with getXValue() and getY() with
* getYValue() (DG);
* 29-Jul-2004 : Added getDomainOrder() method (DG);
* 18-Aug-2004 : Moved from org.jfree.data --> org.jfree.data.xy (DG);
*
*/
package org.jfree.data.xy;
import org.jfree.data.DomainOrder;
import org.jfree.data.general.SeriesDataset;
/**
* An interface through which data in the form of (x, y) items can be accessed.
*/
public interface XYDataset extends SeriesDataset {
/**
* Returns the order of the domain (or X) values returned by the dataset.
*
* @return The order (never <code>null</code>).
*/
public DomainOrder getDomainOrder();
/**
* Returns the number of items in a series.
* <br><br>
* It is recommended that classes that implement this method should throw
* an <code>IllegalArgumentException</code> if the <code>series</code>
* argument is outside the specified range.
*
* @param series the series index (in the range <code>0</code> to
* <code>getSeriesCount() - 1</code>).
*
* @return The item count.
*/
public int getItemCount(int series);
/**
* Returns the x-value for an item within a series. The x-values may or
* may not be returned in ascending order, that is up to the class
* implementing the interface.
*
* @param series the series index (in the range <code>0</code> to
* <code>getSeriesCount() - 1</code>).
* @param item the item index (in the range <code>0</code> to
* <code>getItemCount(series)</code>).
*
* @return The x-value (never <code>null</code>).
*/
public Number getX(int series, int item);
/**
* Returns the x-value for an item within a series.
*
* @param series the series index (in the range <code>0</code> to
* <code>getSeriesCount() - 1</code>).
* @param item the item index (in the range <code>0</code> to
* <code>getItemCount(series)</code>).
*
* @return The x-value.
*/
public double getXValue(int series, int item);
/**
* Returns the y-value for an item within a series.
*
* @param series the series index (in the range <code>0</code> to
* <code>getSeriesCount() - 1</code>).
* @param item the item index (in the range <code>0</code> to
* <code>getItemCount(series)</code>).
*
* @return The y-value (possibly <code>null</code>).
*/
public Number getY(int series, int item);
/**
* Returns the y-value (as a double primitive) for an item within a series.
*
* @param series the series index (in the range <code>0</code> to
* <code>getSeriesCount() - 1</code>).
* @param item the item index (in the range <code>0</code> to
* <code>getItemCount(series)</code>).
*
* @return The y-value.
*/
public double getYValue(int series, int item);
}
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