com.espertech.esper.event.wrap

Class WrapperMapPropertyGetter

java.lang.Object

com.espertech.esper.event.wrap.WrapperMapPropertyGetter

All Implemented Interfaces:

EventPropertyGetter, EventPropertyGetterSPI

public class WrapperMapPropertyGetter
extends Object
implements EventPropertyGetterSPI

Constructor Summary

Constructors

Constructor and Description
WrapperMapPropertyGetter(WrapperEventType wrapperEventType, EventAdapterService eventAdapterService, MapEventType underlyingMapType, EventPropertyGetterSPI mapGetter)

Method Summary

Modifier and Type	Method and Description
CodegenExpression	eventBeanExistsCodegen(CodegenExpression beanExpression, CodegenContext context)
CodegenExpression	eventBeanFragmentCodegen(CodegenExpression beanExpression, CodegenContext context)
CodegenExpression	eventBeanGetCodegen(CodegenExpression beanExpression, CodegenContext context)
Object	get(EventBean theEvent) Return the value for the property in the event object specified when the instance was obtained.
Object	getFragment(EventBean theEvent) Returns EventBean or array of EventBean for a property name or property expression.
boolean	isExistsProperty(EventBean eventBean) Returns true if the property exists, or false if the type does not have such a property.
CodegenExpression	underlyingExistsCodegen(CodegenExpression underlyingExpression, CodegenContext context)
CodegenExpression	underlyingFragmentCodegen(CodegenExpression underlyingExpression, CodegenContext context)
CodegenExpression	underlyingGetCodegen(CodegenExpression underlyingExpression, CodegenContext context)

Methods inherited from class java.lang.Object

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

Constructor Detail

WrapperMapPropertyGetter

public WrapperMapPropertyGetter(WrapperEventType wrapperEventType,
                                EventAdapterService eventAdapterService,
                                MapEventType underlyingMapType,
                                EventPropertyGetterSPI mapGetter)

Method Detail

get

public Object get(EventBean theEvent)

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:

theEvent - 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 Object getFragment(EventBean theEvent)

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:

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

Returns:

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

eventBeanGetCodegen

public CodegenExpression eventBeanGetCodegen(CodegenExpression beanExpression,
                                             CodegenContext context)

Specified by:

eventBeanGetCodegen in interface EventPropertyGetterSPI

eventBeanExistsCodegen

public CodegenExpression eventBeanExistsCodegen(CodegenExpression beanExpression,
                                                CodegenContext context)

Specified by:

eventBeanExistsCodegen in interface EventPropertyGetterSPI

eventBeanFragmentCodegen

public CodegenExpression eventBeanFragmentCodegen(CodegenExpression beanExpression,
                                                  CodegenContext context)

Specified by:

eventBeanFragmentCodegen in interface EventPropertyGetterSPI

underlyingGetCodegen

public CodegenExpression underlyingGetCodegen(CodegenExpression underlyingExpression,
                                              CodegenContext context)

Specified by:

underlyingGetCodegen in interface EventPropertyGetterSPI

underlyingExistsCodegen

public CodegenExpression underlyingExistsCodegen(CodegenExpression underlyingExpression,
                                                 CodegenContext context)

Specified by:

underlyingExistsCodegen in interface EventPropertyGetterSPI

underlyingFragmentCodegen

public CodegenExpression underlyingFragmentCodegen(CodegenExpression underlyingExpression,
                                                   CodegenContext context)

Specified by:

underlyingFragmentCodegen in interface EventPropertyGetterSPI