IntervalXYDelegate

java.lang.Object
- org.jfree.data.xy.IntervalXYDelegate

All Implemented Interfaces:

Serializable, Cloneable, EventListener, DomainInfo, DatasetChangeListener, org.jfree.util.PublicCloneable
```
public class IntervalXYDelegate
extends Object
implements DatasetChangeListener, DomainInfo, Serializable, Cloneable, org.jfree.util.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:

Serialized Form

Constructor Summary

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

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`Object`	`clone()`
`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
getClass, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - 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 Detail
  - 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(int, int)
  - 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:
    
    getStartX(int, int)
  - 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(int, int)
  - 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:
    
    getEndX(int, int)
  - 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
```
    Specified by:
    
    clone in interface org.jfree.util.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.

Class IntervalXYDelegate

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

IntervalXYDelegate

IntervalXYDelegate

Method Detail

isAutoWidth

setAutoWidth

getIntervalPositionFactor

setIntervalPositionFactor

getFixedIntervalWidth

setFixedIntervalWidth

getIntervalWidth

getStartX

getStartXValue

getEndX

getEndXValue

getDomainLowerBound

getDomainUpperBound

getDomainBounds

datasetChanged

equals

clone

hashCode