Package com.espertech.esper.common.internal.view.derived

Class BaseBivariateStatisticsView

java.lang.Object
com.espertech.esper.common.internal.view.core.ViewSupport
com.espertech.esper.common.internal.view.derived.BaseBivariateStatisticsView
All Implemented Interfaces:
DerivedValueView, View, Viewable, Iterable<EventBean>
Direct Known Subclasses:
CorrelationView, RegressionLinestView
public abstract class BaseBivariateStatisticsView extends ViewSupport implements DerivedValueView
View for computing statistics that require 2 input variable arrays containing X and Y datapoints. Subclasses compute correlation or regression values, for instance.

  • Field Details

    • viewFactory

      protected final ViewFactory viewFactory

    • statisticsBean

      protected BaseStatisticsBean statisticsBean
      This bean can be overridden by subclasses providing extra values such as correlation, regression.

    • agentInstanceContext

      protected final AgentInstanceContext agentInstanceContext
      Services required by implementing classes.

    • additionalProps

      protected final StatViewAdditionalPropsEval additionalProps
      Additional properties.

    • eventType

      protected final EventType eventType
      Event type.

    • lastValuesEventNew

      protected Object[] lastValuesEventNew

  • Constructor Details

    • BaseBivariateStatisticsView

      public BaseBivariateStatisticsView(ViewFactory viewFactory, AgentInstanceContext agentInstanceContext, ExprEvaluator expressionXEval, ExprEvaluator expressionYEval, EventType eventType, StatViewAdditionalPropsEval additionalProps)
      Constructor requires the name of the two fields to use in the parent view to compute the statistics.
      Parameters:
      expressionXEval - is the expression to get the X values from
      expressionYEval - is the expression to get the Y values from
      agentInstanceContext - contains required view services
      eventType - type of event
      additionalProps - additional props
      viewFactory - view factory

  • Method Details

    • populateMap

      protected abstract EventBean populateMap(BaseStatisticsBean baseStatisticsBean, EventBeanTypedEventFactory eventAdapterService, EventType eventType, StatViewAdditionalPropsEval additionalProps, Object[] decoration)
      Populate bean.
      Parameters:
      baseStatisticsBean - results
      eventAdapterService - event adapters
      eventType - type
      additionalProps - additional props
      decoration - decoration values
      Returns:
      bean

    • update

      public void update(EventBean[] newData, EventBean[] oldData)
      Description copied from interface: View
      Notify that data has been added or removed from the Viewable parent. The last object in the newData array of objects would be the newest object added to the parent view. The first object of the oldData array of objects would be the oldest object removed from the parent view.

      If the call to update contains new (inserted) data, then the first argument will be a non-empty list and the second will be empty. Similarly, if the call is a notification of deleted data, then the first argument will be empty and the second will be non-empty. Either the newData or oldData will be non-null. This method won't be called with both arguments being null, but either one could be null. The same is true for zero-length arrays. Either newData or oldData will be non-empty. If both are non-empty, then the update is a modification notification.

      When update() is called on a view by the parent object, the data in newData will be in the collection of the parent, and its data structures will be arranged to reflect that. The data in oldData will not be in the parent's data structures, and any access to the parent will indicate that that data is no longer there.

      Specified by:
      update in interface View
      Parameters:
      newData - is the new data that has been added to the parent view
      oldData - is the old data that has been removed from the parent view

    • iterator

      public final Iterator<EventBean> iterator()
      Description copied from interface: Viewable
      Allows iteration through all elements in this viewable. The iterator will return the elements in the collection in their natural order, or, if there is no natural ordering, in some unpredictable order.
      Specified by:
      iterator in interface Iterable<EventBean>
      Specified by:
      iterator in interface Viewable
      Returns:
      an iterator which will go through all current elements in the collection.

    • getStatisticsBean

      public BaseStatisticsBean getStatisticsBean()

    • getLastValuesEventNew

      public Object[] getLastValuesEventNew()

    • setLastValuesEventNew

      public void setLastValuesEventNew(Object[] lastValuesEventNew)

    • getAdditionalProps

      public StatViewAdditionalPropsEval getAdditionalProps()

    • getViewFactory

      public ViewFactory getViewFactory()

    • getExpressionXEval

      public ExprEvaluator getExpressionXEval()

    • getExpressionYEval

      public ExprEvaluator getExpressionYEval()