Package org.jfree.data.xy

Class IntervalXYDelegate

java.lang.Object
org.jfree.data.xy.IntervalXYDelegate
All Implemented Interfaces:
Serializable, Cloneable, EventListener, PublicCloneable, DomainInfo, DatasetChangeListener
public class IntervalXYDelegate extends Object implements DatasetChangeListener, DomainInfo, Serializable, Cloneable, PublicCloneable
A delegate that handles the specification or automatic calculation of the interval surrounding the x-values in a dataset. This is used to extend a regular XYDataset to support the IntervalXYDataset interface.

The decorator pattern was not used because of the several possibly implemented interfaces of the decorated instance (e.g. TableXYDataset, RangeInfo, DomainInfo etc.).

The width can be set manually or calculated automatically. The switch autoWidth allows to determine which behavior is used. The auto width calculation tries to find the smallest gap between two x-values in the dataset. If there is only one item in the series, the auto width calculation fails and falls back on the manually set interval width (which is itself defaulted to 1.0).

See Also:

  • Constructor Summary

    Constructors
    Constructor
    Description
    IntervalXYDelegate(XYDataset dataset)
    Creates a new delegate that.
    IntervalXYDelegate(XYDataset dataset, boolean autoWidth)
    Creates a new delegate for the specified dataset.

  • Method Summary

    Modifier and Type
    Method
    Description
    Object
    clone()
    Returns a clone of the object.
    void
    datasetChanged(DatasetChangeEvent e)
    Handles events from the dataset by recalculating the interval if necessary.
    boolean
    equals(Object obj)
    Tests the delegate for equality with an arbitrary object.
    Range
    getDomainBounds(boolean includeInterval)
    Returns the range of the values in the dataset's domain, including or excluding the interval around each x-value as specified.
    double
    getDomainLowerBound(boolean includeInterval)
    Returns the minimum x-value in the dataset.
    double
    getDomainUpperBound(boolean includeInterval)
    Returns the maximum x-value in the dataset.
    Number
    getEndX(int series, int item)
    Returns the end value of the x-interval for an item within a series.
    double
    getEndXValue(int series, int item)
    Returns the end value of the x-interval for an item within a series.
    double
    getFixedIntervalWidth()
    Returns the fixed interval width.
    double
    getIntervalPositionFactor()
    Returns the interval position factor.
    double
    getIntervalWidth()
    Returns the interval width.
    Number
    getStartX(int series, int item)
    Returns the start value of the x-interval for an item within a series.
    double
    getStartXValue(int series, int item)
    Returns the start value of the x-interval for an item within a series.
    int
    hashCode()
    Returns a hash code for this instance.
    boolean
    isAutoWidth()
    Returns true if the interval width is automatically calculated, and false otherwise.
    void
    setAutoWidth(boolean b)
    Sets the flag that indicates whether the interval width is automatically calculated.
    void
    setFixedIntervalWidth(double w)
    Sets the fixed interval width and, as a side effect, sets the autoWidth flag to false.
    void
    setIntervalPositionFactor(double d)
    Sets the interval position factor.

    Methods inherited from class java.lang.Object

    finalize, getClass, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • IntervalXYDelegate

      public IntervalXYDelegate(XYDataset dataset)
      Creates a new delegate that.
      Parameters:
      dataset - the underlying dataset (null not permitted).

    • IntervalXYDelegate

      public IntervalXYDelegate(XYDataset dataset, boolean autoWidth)
      Creates a new delegate for the specified dataset.
      Parameters:
      dataset - the underlying dataset (null not permitted).
      autoWidth - a flag that controls whether the interval width is calculated automatically.

  • Method Details

    • isAutoWidth

      public boolean isAutoWidth()
      Returns true if the interval width is automatically calculated, and false otherwise.
      Returns:
      A boolean.

    • setAutoWidth

      public void setAutoWidth(boolean b)
      Sets the flag that indicates whether the interval width is automatically calculated. If the flag is set to true, the interval is recalculated.

      Note: recalculating the interval amounts to changing the data values represented by the dataset. The calling dataset must fire an appropriate DatasetChangeEvent.

      Parameters:
      b - a boolean.

    • getIntervalPositionFactor

      public double getIntervalPositionFactor()
      Returns the interval position factor.
      Returns:
      The interval position factor.

    • setIntervalPositionFactor

      public void setIntervalPositionFactor(double d)
      Sets the interval position factor. This controls how the interval is aligned to the x-value. For a value of 0.5, the interval is aligned with the x-value in the center. For a value of 0.0, the interval is aligned with the x-value at the lower end of the interval, and for a value of 1.0, the interval is aligned with the x-value at the upper end of the interval.

      Note that changing the interval position factor amounts to changing the data values represented by the dataset. Therefore, the dataset that is using this delegate is responsible for generating the appropriate DatasetChangeEvent.
      Parameters:
      d - the new interval position factor (in the range 0.0 to 1.0 inclusive).

    • getFixedIntervalWidth

      public double getFixedIntervalWidth()
      Returns the fixed interval width.
      Returns:
      The fixed interval width.

    • setFixedIntervalWidth

      public void setFixedIntervalWidth(double w)
      Sets the fixed interval width and, as a side effect, sets the autoWidth flag to false.

      Note that changing the interval width amounts to changing the data values represented by the dataset. Therefore, the dataset that is using this delegate is responsible for generating the appropriate DatasetChangeEvent.
      Parameters:
      w - the width (negative values not permitted).

    • getIntervalWidth

      public double getIntervalWidth()
      Returns the interval width. This method will return either the auto calculated interval width or the manually specified interval width, depending on the isAutoWidth() result.
      Returns:
      The interval width to use.

    • getStartX

      public Number getStartX(int series, int item)
      Returns the start value of the x-interval for an item within a series.
      Parameters:
      series - the series index.
      item - the item index.
      Returns:
      The start value of the x-interval (possibly null).
      See Also:

    • getStartXValue

      public double getStartXValue(int series, int item)
      Returns the start value of the x-interval for an item within a series.
      Parameters:
      series - the series index.
      item - the item index.
      Returns:
      The start value of the x-interval.
      See Also:

    • getEndX

      public Number getEndX(int series, int item)
      Returns the end value of the x-interval for an item within a series.
      Parameters:
      series - the series index.
      item - the item index.
      Returns:
      The end value of the x-interval (possibly null).
      See Also:

    • getEndXValue

      public double getEndXValue(int series, int item)
      Returns the end value of the x-interval for an item within a series.
      Parameters:
      series - the series index.
      item - the item index.
      Returns:
      The end value of the x-interval.
      See Also:

    • getDomainLowerBound

      public double getDomainLowerBound(boolean includeInterval)
      Returns the minimum x-value in the dataset.
      Specified by:
      getDomainLowerBound in interface DomainInfo
      Parameters:
      includeInterval - a flag that determines whether or not the x-interval is taken into account.
      Returns:
      The minimum value.

    • getDomainUpperBound

      public double getDomainUpperBound(boolean includeInterval)
      Returns the maximum x-value in the dataset.
      Specified by:
      getDomainUpperBound in interface DomainInfo
      Parameters:
      includeInterval - a flag that determines whether or not the x-interval is taken into account.
      Returns:
      The maximum value.

    • getDomainBounds

      public Range getDomainBounds(boolean includeInterval)
      Returns the range of the values in the dataset's domain, including or excluding the interval around each x-value as specified.
      Specified by:
      getDomainBounds in interface DomainInfo
      Parameters:
      includeInterval - a flag that determines whether or not the x-interval should be taken into account.
      Returns:
      The range.

    • datasetChanged

      public void datasetChanged(DatasetChangeEvent e)
      Handles events from the dataset by recalculating the interval if necessary.
      Specified by:
      datasetChanged in interface DatasetChangeListener
      Parameters:
      e - the event.

    • equals

      public boolean equals(Object obj)
      Tests the delegate for equality with an arbitrary object. The equality test considers two delegates to be equal if they would calculate the same intervals for any given dataset (for this reason, the dataset itself is NOT included in the equality test, because it is just a reference back to the current 'owner' of the delegate).
      Overrides:
      equals in class Object
      Parameters:
      obj - the object (null permitted).
      Returns:
      A boolean.

    • clone

      public Object clone() throws CloneNotSupportedException
      Description copied from interface: PublicCloneable
      Returns a clone of the object.
      Specified by:
      clone in interface PublicCloneable
      Overrides:
      clone in class Object
      Returns:
      A clone of this delegate.
      Throws:
      CloneNotSupportedException - if the object cannot be cloned.

    • hashCode

      public int hashCode()
      Returns a hash code for this instance.
      Overrides:
      hashCode in class Object
      Returns:
      A hash code.