com.espertech.esper.event.map

Class MapPOJOEntryPropertyGetter

java.lang.Object

com.espertech.esper.event.bean.BaseNativePropertyGetter

com.espertech.esper.event.map.MapPOJOEntryPropertyGetter

All Implemented Interfaces:

EventPropertyGetter, MapEventPropertyGetter

public class MapPOJOEntryPropertyGetter
extends BaseNativePropertyGetter
implements MapEventPropertyGetter

A getter that works on POJO events residing within a Map as an event property.

Constructor Summary

Constructors

Constructor and Description
MapPOJOEntryPropertyGetter(String propertyMap, BeanEventPropertyGetter mapEntryGetter, EventAdapterService eventAdapterService, Class returnType, Class nestedComponentType) Ctor.

Method Summary

Modifier and Type	Method and Description
Object	get(EventBean obj) Return the value for the property in the event object specified when the instance was obtained.
Object	getMap(Map<String,Object> map) Returns a property of an event.
boolean	isExistsProperty(EventBean eventBean) Returns true if the property exists, or false if the type does not have such a property.
boolean	isMapExistsProperty(Map<String,Object> map) Exists-function for properties in a map-type event.

Methods inherited from class com.espertech.esper.event.bean.BaseNativePropertyGetter

getFragment, getFragmentDynamic

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.espertech.esper.client.EventPropertyGetter

getFragment

Constructor Detail

MapPOJOEntryPropertyGetter

public MapPOJOEntryPropertyGetter(String propertyMap,
                                  BeanEventPropertyGetter mapEntryGetter,
                                  EventAdapterService eventAdapterService,
                                  Class returnType,
                                  Class nestedComponentType)

Ctor.

Parameters:

propertyMap - the property to look at

mapEntryGetter - the getter for the map entry

eventAdapterService - for producing wrappers to objects

returnType - type of the entry returned

nestedComponentType - nested type

Method Detail

getMap

public Object getMap(Map<String,Object> map)
              throws PropertyAccessException

Description copied from interface: MapEventPropertyGetter

Returns a property of an event.

Specified by:

getMap in interface MapEventPropertyGetter

Parameters:

map - to interrogate

Returns:

property value

Throws:

PropertyAccessException - for property access errors

isMapExistsProperty

public boolean isMapExistsProperty(Map<String,Object> map)

Description copied from interface: MapEventPropertyGetter

Exists-function for properties in a map-type event.

Specified by:

isMapExistsProperty in interface MapEventPropertyGetter

Parameters:

map - to interrogate

Returns:

indicator

get

public Object get(EventBean obj)

Description copied from interface: EventPropertyGetter

Return the value for the property in the event object specified when the instance was obtained. Useful for fast access to event properties. Throws a PropertyAccessException if the getter instance doesn't match the EventType it was obtained from, and to indicate other property access problems.

Specified by:

get in interface EventPropertyGetter

Parameters:

obj - is the event to get the value of a property from

Returns:

value of property in event

isExistsProperty

public boolean isExistsProperty(EventBean eventBean)

Description copied from interface: EventPropertyGetter

Returns true if the property exists, or false if the type does not have such a property.

Useful for dynamic properties of the syntax "property?" and the dynamic nested/indexed/mapped versions. Dynamic nested properties follow the syntax "property?.nested" which is equivalent to "property?.nested?". If any of the properties in the path of a dynamic nested property return null, the dynamic nested property does not exists and the method returns false.

For non-dynamic properties, this method always returns true since a getter would not be available unless

Specified by:

isExistsProperty in interface EventPropertyGetter

Parameters:

eventBean - is the event to check if the dynamic property exists

Returns:

indictor whether the property exists, always true for non-dynamic (default) properties