Package com.espertech.esper.common.internal.event.core

Class WrapperEventBean

java.lang.Object
com.espertech.esper.common.internal.event.core.WrapperEventBean
All Implemented Interfaces:
EventBean, DecoratingEventBean, EventBeanSPI
public class WrapperEventBean extends Object implements EventBeanSPI, DecoratingEventBean
Event bean that wraps another event bean adding additional properties.

This can be useful for classes for which the statement adds derived values retaining the original class.

The event type of such events is always WrapperEventType. Additional properties are stored in a Map.

  • Constructor Details

    • WrapperEventBean

      public WrapperEventBean(EventBean theEvent, Map<String,Object> properties, EventType eventType)
      Ctor.
      Parameters:
      theEvent - is the wrapped event
      properties - is zero or more property values that embellish the wrapped event
      eventType - is the WrapperEventType.

  • Method Details

    • get

      public Object get(String property) throws PropertyAccessException
      Description copied from interface: EventBean
      Returns the value of an event property for the given property name or property expression.

      Returns null if the property value is null. Throws an exception if the expression is not valid against the event type.

      The method takes a property name or property expression as a parameter. Property expressions may include indexed properties via the syntax "name[index]", mapped properties via the syntax "name('key')", nested properties via the syntax "outer.inner" or combinations thereof.

      Specified by:
      get in interface EventBean
      Parameters:
      property - - name or expression of the property whose value is to be retrieved
      Returns:
      the value of a property with the specified name.
      Throws:
      PropertyAccessException - - if there is no property of the specified name, or the property cannot be accessed

    • getEventType

      public EventType getEventType()
      Description copied from interface: EventBean
      Return the EventType instance that describes the set of properties available for this event.
      Specified by:
      getEventType in interface EventBean
      Returns:
      event type

    • getUnderlying

      public Object getUnderlying()
      Description copied from interface: EventBean
      Get the underlying data object to this event wrapper.
      Specified by:
      getUnderlying in interface EventBean
      Returns:
      underlying data object, usually either a Map or a Java bean instance.

    • getUnderlyingMap

      public Map getUnderlyingMap()
      Returns the underlying map storing the additional properties, if any.
      Returns:
      event property map

    • getDecoratingProperties

      public Map<String,Object> getDecoratingProperties()
      Description copied from interface: DecoratingEventBean
      Returns decorating properties.
      Specified by:
      getDecoratingProperties in interface DecoratingEventBean
      Returns:
      property name and values

    • getUnderlyingEvent

      public EventBean getUnderlyingEvent()
      Description copied from interface: DecoratingEventBean
      Returns the underlying event to the decorated event.
      Specified by:
      getUnderlyingEvent in interface DecoratingEventBean
      Returns:
      underlying

    • toString

      public String toString()
      Overrides:
      toString in class Object

    • getFragment

      public Object getFragment(String propertyExpression)
      Description copied from interface: EventBean
      Returns event beans or array of event bean for a property name or property expression.

      For use with properties whose value is itself an event or whose value can be represented as an event by the underlying event representation.

      The EventType of the event bean instance(s) returned by this method can be determined by EventType.getFragmentType(String). Use EventPropertyDescriptor to obtain a list of properties that return fragments from an event type.

      Returns null if the property value is null or the property value cannot be represented as a fragment by the underlying representation.

      The method takes a property name or property expression as a parameter. Property expressions may include indexed properties via the syntax "name[index]", mapped properties via the syntax "name('key')", nested properties via the syntax "outer.inner" or combinations thereof.

      Specified by:
      getFragment in interface EventBean
      Parameters:
      propertyExpression - - name or expression of the property whose value is to be presented as an EventBean or array of EventBean
      Returns:
      the value of a property as an EventBean or array of EventBean

    • setUnderlying

      public void setUnderlying(Object underlying)
      Specified by:
      setUnderlying in interface EventBeanSPI