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

public class WrapperEventBean
extends Object
implements EventBean, 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 Summary

Constructors

Constructor and Description
WrapperEventBean(EventBean theEvent, Map<String,Object> properties, EventType eventType) Ctor.

Method Summary

Modifier and Type	Method and Description
Object	get(String property) Returns the value of an event property for the given property name or property expression.
Map<String,Object>	getDecoratingProperties() Returns decorating properties.
EventType	getEventType() Return the EventType instance that describes the set of properties available for this event.
Object	getFragment(String propertyExpression) Returns event beans or array of event bean for a property name or property expression.
Object	getUnderlying() Get the underlying data object to this event wrapper.
EventBean	getUnderlyingEvent() Returns the underlying event to the decorated event.
Map	getUnderlyingMap() Returns the underlying map storing the additional properties, if any.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

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 Detail

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