com.espertech.esper.event.vaevent
Class VariantEventBean

java.lang.Object
  com.espertech.esper.event.vaevent.VariantEventBean

All Implemented Interfaces:

EventBean, VariantEvent

public class VariantEventBean
extends java.lang.Object
implements EventBean, VariantEvent

An event bean that represents multiple potentially disparate underlying events and presents a unified face across each such types or even any type.

Constructor Summary

VariantEventBean(VariantEventType variantEventType, EventBean underlying)
Ctor.

Method Summary

java.lang.Object	get(java.lang.String property) Returns the value of an event property for the given property name or property expression.
EventType	getEventType() Return the EventType instance that describes the set of properties available for this event.
java.lang.Object	getFragment(java.lang.String propertyExpression) Returns event beans or array of event bean for a property name or property expression.
java.lang.Object	getUnderlying() Get the underlying data object to this event wrapper.
EventBean	getUnderlyingEventBean() Returns the underlying event.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

VariantEventBean

public VariantEventBean(VariantEventType variantEventType,
                        EventBean underlying)

Ctor.

Parameters:

variantEventType - the event type

underlying - the event

Method Detail

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

get

public java.lang.Object get(java.lang.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

getUnderlying

public java.lang.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.

getUnderlyingEventBean

public EventBean getUnderlyingEventBean()

Returns the underlying event.

Specified by:

getUnderlyingEventBean in interface VariantEvent

Returns:

underlying event

getFragment

public java.lang.Object getFragment(java.lang.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