com.espertech.esper.common.internal.event.bean.getter

Class DynamicSimplePropertyGetterByField

java.lang.Object

com.espertech.esper.common.internal.event.bean.getter.DynamicPropertyGetterByFieldBase

com.espertech.esper.common.internal.event.bean.getter.DynamicSimplePropertyGetterByField

All Implemented Interfaces:

EventPropertyGetter, EventPropertyValueGetter, BeanEventPropertyGetter, EventPropertyGetterSPI, EventPropertyValueGetterForge

public class DynamicSimplePropertyGetterByField
extends DynamicPropertyGetterByFieldBase

Getter for a dynamic property (syntax field.inner?), using vanilla reflection.

Field Summary

Fields inherited from class com.espertech.esper.common.internal.event.bean.getter.DynamicPropertyGetterByFieldBase

beanEventTypeFactory, cache, eventBeanTypedEventFactory, sharableCode

Fields inherited from interface com.espertech.esper.common.client.EventPropertyValueGetter

EPTYPE, EPTYPEARRAY

Constructor Summary

Constructors

Constructor and Description
DynamicSimplePropertyGetterByField(String fieldName, EventBeanTypedEventFactory eventBeanTypedEventFactory, BeanEventTypeFactory beanEventTypeFactory)

Method Summary

Modifier and Type	Method and Description
protected Object	call(DynamicPropertyDescriptorByField descriptor, Object underlying) Call the getter to obtains the return result object, or null if no such field exists.
protected CodegenExpression	callCodegen(CodegenExpressionRef desc, CodegenExpressionRef object, CodegenMethodScope parent, CodegenClassScope codegenClassScope)
protected Field	determineField(Class clazz) To be implemented to return the field required, or null to indicate an appropriate field could not be found.
protected CodegenExpression	determineFieldCodegen(CodegenExpressionRef clazz, CodegenMethodScope parent, CodegenClassScope codegenClassScope)
static Object	dynamicSimplePropertyCall(DynamicPropertyDescriptorByField descriptor, Object underlying) NOTE: Code-generation-invoked method, method name and parameter order matters
static Field	dynamicSimplePropertyDetermineField(String fieldName, Class clazz) NOTE: Code-generation-invoked method, method name and parameter order matters
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, CodegenMethodScope codegenMethodScope, CodegenClassScope codegenClassScope)

Methods inherited from class com.espertech.esper.common.internal.event.bean.getter.DynamicPropertyGetterByFieldBase

cacheAndCall, cacheAndExists, cacheAndExistsCodegen, dynamicPropertyCacheAdd, dynamicPropertyCacheCheck, eventBeanExistsCodegen, eventBeanFragmentCodegen, eventBeanGetCodegen, get, getBeanProp, getBeanPropType, getFragment, getPopulateCache, getPopulateCacheCodegen, getTargetType, handleException, isBeanExistsProperty, underlyingFragmentCodegen, underlyingGetCodegen

Methods inherited from class java.lang.Object

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

Constructor Detail

DynamicSimplePropertyGetterByField

public DynamicSimplePropertyGetterByField(String fieldName,
                                          EventBeanTypedEventFactory eventBeanTypedEventFactory,
                                          BeanEventTypeFactory beanEventTypeFactory)

Method Detail

determineField

protected Field determineField(Class clazz)

Description copied from class: DynamicPropertyGetterByFieldBase

To be implemented to return the field required, or null to indicate an appropriate field could not be found.

Specified by:

determineField in class DynamicPropertyGetterByFieldBase

Parameters:

clazz - to search for a matching field

Returns:

field if found, or null if no matching field exists

determineFieldCodegen

protected CodegenExpression determineFieldCodegen(CodegenExpressionRef clazz,
                                                  CodegenMethodScope parent,
                                                  CodegenClassScope codegenClassScope)

Specified by:

determineFieldCodegen in class DynamicPropertyGetterByFieldBase

call

protected Object call(DynamicPropertyDescriptorByField descriptor,
                      Object underlying)

Description copied from class: DynamicPropertyGetterByFieldBase

Call the getter to obtains the return result object, or null if no such field exists.

Specified by:

call in class DynamicPropertyGetterByFieldBase

Parameters:

descriptor - provides field information for the class

underlying - is the underlying object to ask for the property value

Returns:

underlying

callCodegen

protected CodegenExpression callCodegen(CodegenExpressionRef desc,
                                        CodegenExpressionRef object,
                                        CodegenMethodScope parent,
                                        CodegenClassScope codegenClassScope)

Specified by:

callCodegen in class DynamicPropertyGetterByFieldBase

underlyingExistsCodegen

public CodegenExpression underlyingExistsCodegen(CodegenExpression underlyingExpression,
                                                 CodegenMethodScope codegenMethodScope,
                                                 CodegenClassScope codegenClassScope)

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

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

dynamicSimplePropertyDetermineField

public static Field dynamicSimplePropertyDetermineField(String fieldName,
                                                        Class clazz)

NOTE: Code-generation-invoked method, method name and parameter order matters

Parameters:

fieldName - name

clazz - class

Returns:

method or null

dynamicSimplePropertyCall

public static Object dynamicSimplePropertyCall(DynamicPropertyDescriptorByField descriptor,
                                               Object underlying)

NOTE: Code-generation-invoked method, method name and parameter order matters

Parameters:

descriptor - desc

underlying - underlying

Returns:

value