## org.jfree.data.xy
Class XYBarDataset

    java.lang.Object
      org.jfree.data.general.AbstractDataset
          org.jfree.data.general.AbstractSeriesDataset
              org.jfree.data.xy.AbstractXYDataset
                  org.jfree.data.xy.AbstractIntervalXYDataset
                      org.jfree.data.xy.XYBarDataset

All Implemented Interfaces:
  java.io.ObjectInputValidation, java.io.Serializable, java.lang.Cloneable, java.util.EventListener, Dataset, DatasetChangeListener, SeriesChangeListener, SeriesDataset, IntervalXYDataset, XYDataset

    public class XYBarDataset

extends AbstractIntervalXYDataset
implements IntervalXYDataset, DatasetChangeListener

A dataset wrapper class that converts a standard `XYDataset` into an `IntervalXYDataset` suitable for use in creating XY bar charts.

See Also:
  Serialized Form

Constructor Summary
`XYBarDataset(XYDataset underlying, double barWidth)` Creates a new dataset.

Method Summary
`java.lang.Object` `clone()` Returns an independent copy of the dataset.
`void` `datasetChanged(DatasetChangeEvent event)` Receives notification of an dataset change event.
`boolean` `equals(java.lang.Object obj)` Tests this dataset for equality with an arbitrary object.
`double` `getBarWidth()` Returns the bar width.
`java.lang.Number` `getEndX(int series, int item)` Returns the ending X value for the specified series and item.
`double` `getEndXValue(int series, int item)` Returns the ending x-value (as a double primitive) for an item within a series.
`java.lang.Number` `getEndY(int series, int item)` Returns the ending Y value for the specified series and item.
`double` `getEndYValue(int series, int item)` Returns the ending y-value (as a double primitive) for an item within a series.
`int` `getItemCount(int series)` Returns the number of items in a series.
`int` `getSeriesCount()` Returns the number of series in the dataset.
`java.lang.Comparable` `getSeriesKey(int series)` Returns the key for a series.
`java.lang.Number` `getStartX(int series, int item)` Returns the starting X value for the specified series and item.
`double` `getStartXValue(int series, int item)` Returns the starting x-value (as a double primitive) for an item within a series.
`java.lang.Number` `getStartY(int series, int item)` Returns the starting Y value for the specified series and item.
`double` `getStartYValue(int series, int item)` Returns the starting y-value (as a double primitive) for an item within a series.
`XYDataset` `getUnderlyingDataset()` Returns the underlying dataset that was specified via the constructor.
`java.lang.Number` `getX(int series, int item)` Returns the x-value for an item within a series.
`double` `getXValue(int series, int item)` Returns the x-value (as a double primitive) for an item within a series.
`java.lang.Number` `getY(int series, int item)` Returns the y-value for an item within a series.
`double` `getYValue(int series, int item)` Returns the y-value (as a double primitive) for an item within a series.
`void` `setBarWidth(double barWidth)` Sets the bar width and sends a `DatasetChangeEvent` to all registered listeners.

Methods inherited from class org.jfree.data.xy.AbstractXYDataset
`getDomainOrder`

Methods inherited from class org.jfree.data.general.AbstractSeriesDataset
`indexOf, seriesChanged`

Methods inherited from class org.jfree.data.general.AbstractDataset
`addChangeListener, fireDatasetChanged, getGroup, hasListener, notifyListeners, removeChangeListener, setGroup, validateObject`

Methods inherited from class java.lang.Object
`finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Methods inherited from interface org.jfree.data.xy.XYDataset
`getDomainOrder`

Methods inherited from interface org.jfree.data.general.SeriesDataset
`indexOf`

Methods inherited from interface org.jfree.data.general.Dataset
`addChangeListener, getGroup, removeChangeListener, setGroup`

Constructor Detail

### XYBarDataset

    public XYBarDataset(XYDataset underlying,
                        double barWidth)

  Creates a new dataset.

  Parameters:
    `underlying` - the underlying dataset (`null` not permitted).
    `barWidth` - the width of the bars.

Method Detail

### getUnderlyingDataset

    public XYDataset getUnderlyingDataset()

  Returns the underlying dataset that was specified via the constructor.

  Returns:
    The underlying dataset (never `null`).
  Since:
    1.0.4

### getBarWidth

    public double getBarWidth()

  Returns the bar width.

  Returns:
    The bar width.
  Since:
    1.0.4
  See Also:
    `setBarWidth(double)`

### setBarWidth

    public void setBarWidth(double barWidth)

  Sets the bar width and sends a `DatasetChangeEvent` to all registered listeners.

  Parameters:
    `barWidth` - the bar width.
  Since:
    1.0.4
  See Also:
    `getBarWidth()`

### getSeriesCount

    public int getSeriesCount()

  Returns the number of series in the dataset.

  Specified by:
    `getSeriesCount` in interface `SeriesDataset`
  Specified by:
    `getSeriesCount` in class `AbstractSeriesDataset`
  Returns:
    The series count.

### getSeriesKey

    public java.lang.Comparable getSeriesKey(int series)

  Returns the key for a series.

  Specified by:
    `getSeriesKey` in interface `SeriesDataset`
  Specified by:
    `getSeriesKey` in class `AbstractSeriesDataset`
  Parameters:
    `series` - the series index (in the range `0` to `getSeriesCount() - 1`).
  Returns:
    The series key.

### getItemCount

    public int getItemCount(int series)

  Returns the number of items in a series.

  Specified by:
    `getItemCount` in interface `XYDataset`
  Parameters:
    `series` - the series index (zero-based).
  Returns:
    The item count.

### getX

    public java.lang.Number getX(int series,
                                 int item)

  Returns the x-value for an item within a series.

  Specified by:
    `getX` in interface `XYDataset`
  Parameters:
    `series` - the series index (zero-based).
    `item` - the item index (zero-based).
  Returns:
    The x-value.
  See Also:
    `getXValue(int, int)`

### getXValue

    public double getXValue(int series,
                            int item)

  Returns the x-value (as a double primitive) for an item within a series.

  Specified by:
    `getXValue` in interface `XYDataset`
  Overrides:
    `getXValue` in class `AbstractXYDataset`
  Parameters:
    `series` - the series index (zero-based).
    `item` - the item index (zero-based).
  Returns:
    The value.
  See Also:
    `getX(int, int)`

### getY

    public java.lang.Number getY(int series,
                                 int item)

  Returns the y-value for an item within a series.

  Specified by:
    `getY` in interface `XYDataset`
  Parameters:
    `series` - the series index (zero-based).
    `item` - the item index (zero-based).
  Returns:
    The y-value (possibly `null`).
  See Also:
    `getYValue(int, int)`

### getYValue

    public double getYValue(int series,
                            int item)

  Returns the y-value (as a double primitive) for an item within a series.

  Specified by:
    `getYValue` in interface `XYDataset`
  Overrides:
    `getYValue` in class `AbstractXYDataset`
  Parameters:
    `series` - the series index (zero-based).
    `item` - the item index (zero-based).
  Returns:
    The value.
  See Also:
    `getY(int, int)`

### getStartX

    public java.lang.Number getStartX(int series,
                                      int item)

  Returns the starting X value for the specified series and item.

  Specified by:
    `getStartX` in interface `IntervalXYDataset`
  Parameters:
    `series` - the series index (zero-based).
    `item` - the item index (zero-based).
  Returns:
    The value.

### getStartXValue

    public double getStartXValue(int series,
                                 int item)

  Returns the starting x-value (as a double primitive) for an item within a series.

  Specified by:
    `getStartXValue` in interface `IntervalXYDataset`
  Overrides:
    `getStartXValue` in class `AbstractIntervalXYDataset`
  Parameters:
    `series` - the series index (zero-based).
    `item` - the item index (zero-based).
  Returns:
    The value.
  See Also:
    `getXValue(int, int)`

### getEndX

    public java.lang.Number getEndX(int series,
                                    int item)

  Returns the ending X value for the specified series and item.

  Specified by:
    `getEndX` in interface `IntervalXYDataset`
  Parameters:
    `series` - the series index (zero-based).
    `item` - the item index (zero-based).
  Returns:
    The value.

### getEndXValue

    public double getEndXValue(int series,
                               int item)

  Returns the ending x-value (as a double primitive) for an item within a series.

  Specified by:
    `getEndXValue` in interface `IntervalXYDataset`
  Overrides:
    `getEndXValue` in class `AbstractIntervalXYDataset`
  Parameters:
    `series` - the series index (zero-based).
    `item` - the item index (zero-based).
  Returns:
    The value.
  See Also:
    `getXValue(int, int)`

### getStartY

    public java.lang.Number getStartY(int series,
                                      int item)

  Returns the starting Y value for the specified series and item.

  Specified by:
    `getStartY` in interface `IntervalXYDataset`
  Parameters:
    `series` - the series index (zero-based).
    `item` - the item index (zero-based).
  Returns:
    The value.

### getStartYValue

    public double getStartYValue(int series,
                                 int item)

  Returns the starting y-value (as a double primitive) for an item within a series.

  Specified by:
    `getStartYValue` in interface `IntervalXYDataset`
  Overrides:
    `getStartYValue` in class `AbstractIntervalXYDataset`
  Parameters:
    `series` - the series index (zero-based).
    `item` - the item index (zero-based).
  Returns:
    The value.
  See Also:
    `getYValue(int, int)`

### getEndY

    public java.lang.Number getEndY(int series,
                                    int item)

  Returns the ending Y value for the specified series and item.

  Specified by:
    `getEndY` in interface `IntervalXYDataset`
  Parameters:
    `series` - the series index (zero-based).
    `item` - the item index (zero-based).
  Returns:
    The value.

### getEndYValue

    public double getEndYValue(int series,
                               int item)

  Returns the ending y-value (as a double primitive) for an item within a series.

  Specified by:
    `getEndYValue` in interface `IntervalXYDataset`
  Overrides:
    `getEndYValue` in class `AbstractIntervalXYDataset`
  Parameters:
    `series` - the series index (zero-based).
    `item` - the item index (zero-based).
  Returns:
    The value.
  See Also:
    `getYValue(int, int)`

### datasetChanged

    public void datasetChanged(DatasetChangeEvent event)

  Receives notification of an dataset change event.

  Specified by:
    `datasetChanged` in interface `DatasetChangeListener`
  Parameters:
    `event` - information about the event.

### equals

    public boolean equals(java.lang.Object obj)

  Tests this dataset for equality with an arbitrary object.

  Overrides:
    `equals` in class `java.lang.Object`
  Parameters:
    `obj` - the object (`null` permitted).
  Returns:
    A boolean.

### clone

    public java.lang.Object clone()
                           throws java.lang.CloneNotSupportedException

  Returns an independent copy of the dataset. Note that:
  - the underlying dataset is only cloned if it implements the `PublicCloneable` interface;
  - the listeners registered with this dataset are not carried over to the cloned dataset.

  Overrides:
    `clone` in class `AbstractDataset`
  Returns:
    An independent copy of the dataset.
  Throws:
    `java.lang.CloneNotSupportedException` - if the dataset cannot be cloned for any reason.