com.espertech.esper.event.arr
Class ObjectArrayNestedEntryPropertyGetterBase

java.lang.Object
  com.espertech.esper.event.arr.ObjectArrayNestedEntryPropertyGetterBase

All Implemented Interfaces:

EventPropertyGetter, ObjectArrayEventPropertyGetter

Direct Known Subclasses:

ObjectArrayNestedEntryPropertyGetterArrayMap, ObjectArrayNestedEntryPropertyGetterArrayObjectArray, ObjectArrayNestedEntryPropertyGetterMap, ObjectArrayNestedEntryPropertyGetterObjectArray

public abstract class ObjectArrayNestedEntryPropertyGetterBase
extends java.lang.Object
implements ObjectArrayEventPropertyGetter

Field Summary

protected EventAdapterService	eventAdapterService
protected EventType	fragmentType
protected int	propertyIndex

Constructor Summary

ObjectArrayNestedEntryPropertyGetterBase(int propertyIndex, EventType fragmentType, EventAdapterService eventAdapterService)
Ctor.

Method Summary

java.lang.Object	get(EventBean obj) Return the value for the property in the event object specified when the instance was obtained.
java.lang.Object	getFragment(EventBean obj) Returns EventBean or array of EventBean for a property name or property expression.
java.lang.Object	getObjectArray(java.lang.Object[] array) Returns a property of an event.
abstract java.lang.Object	handleNestedValue(java.lang.Object value)
abstract java.lang.Object	handleNestedValueFragment(java.lang.Object value)
boolean	isExistsProperty(EventBean eventBean) Returns true if the property exists, or false if the type does not have such a property.
boolean	isObjectArrayExistsProperty(java.lang.Object[] array) Exists-function for properties in a object array-type event.

Methods inherited from class java.lang.Object

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

Field Detail

propertyIndex

protected final int propertyIndex

fragmentType

protected final EventType fragmentType

eventAdapterService

protected final EventAdapterService eventAdapterService

Constructor Detail

ObjectArrayNestedEntryPropertyGetterBase

public ObjectArrayNestedEntryPropertyGetterBase(int propertyIndex,
                                                EventType fragmentType,
                                                EventAdapterService eventAdapterService)

Ctor.

Parameters:

propertyIndex - the property to look at

eventAdapterService - factory for event beans and event types

fragmentType - type of the entry returned

Method Detail

handleNestedValue

public abstract java.lang.Object handleNestedValue(java.lang.Object value)

handleNestedValueFragment

public abstract java.lang.Object handleNestedValueFragment(java.lang.Object value)

getObjectArray

public java.lang.Object getObjectArray(java.lang.Object[] array)
                                throws PropertyAccessException

Description copied from interface: ObjectArrayEventPropertyGetter

Returns a property of an event.

Specified by:

getObjectArray in interface ObjectArrayEventPropertyGetter

Parameters:

array - to interrogate

Returns:

property value

Throws:

PropertyAccessException - for property access errors

isObjectArrayExistsProperty

public boolean isObjectArrayExistsProperty(java.lang.Object[] array)

Description copied from interface: ObjectArrayEventPropertyGetter

Exists-function for properties in a object array-type event.

Specified by:

isObjectArrayExistsProperty in interface ObjectArrayEventPropertyGetter

Parameters:

array - to interrogate

Returns:

indicator

get

public java.lang.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

getFragment

public java.lang.Object getFragment(EventBean obj)

Description copied from interface: EventPropertyGetter

Returns EventBean or array of EventBean 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 EventBean 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.

Specified by:

getFragment in interface EventPropertyGetter

Parameters:

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

Returns:

the value of a property as an EventBean or array of EventBean