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

Class DynamicIndexedPropertyGetter

java.lang.Object

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

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

All Implemented Interfaces:

EventPropertyGetter, EventPropertyValueGetter, BeanEventPropertyGetter, EventPropertyGetterSPI, EventPropertyValueGetterForge

public class DynamicIndexedPropertyGetter
extends DynamicPropertyGetterBase

Getter for a dynamic indexed property (syntax field.indexed[0]?), using vanilla reflection.

Field Summary

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

beanEventTypeFactory, cache, eventBeanTypedEventFactory, sharableCode

Constructor Summary

Constructors

Constructor and Description
DynamicIndexedPropertyGetter(String fieldName, int index, EventBeanTypedEventFactory eventBeanTypedEventFactory, BeanEventTypeFactory beanEventTypeFactory)

Method Summary

Modifier and Type	Method and Description
protected Object	call(DynamicPropertyDescriptor descriptor, Object underlying) Call the getter to obtains the return result object, or null if no such method exists.
protected CodegenExpression	callCodegen(CodegenExpressionRef desc, CodegenExpressionRef object, CodegenMethodScope parent, CodegenClassScope codegenClassScope)
protected Method	determineMethod(Class clazz) To be implemented to return the method required, or null to indicate an appropriate method could not be found.
protected CodegenExpression	determineMethodCodegen(CodegenExpressionRef clazz, CodegenMethodScope parent, CodegenClassScope codegenClassScope)
static boolean	dynamicIndexedPropertyExists(DynamicPropertyDescriptor descriptor, Object underlying, int index) NOTE: Code-generation-invoked method, method name and parameter order matters
static Object	dynamicIndexedPropertyGet(DynamicPropertyDescriptor descriptor, Object underlying, Object[] parameters, int index) NOTE: Code-generation-invoked method, method name and parameter order matters
static Method	dynamicIndexPropertyDetermineMethod(Class clazz, String getterMethodName) 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 parent, CodegenClassScope codegenClassScope)

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

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

DynamicIndexedPropertyGetter

public DynamicIndexedPropertyGetter(String fieldName,
                                    int index,
                                    EventBeanTypedEventFactory eventBeanTypedEventFactory,
                                    BeanEventTypeFactory beanEventTypeFactory)

Method Detail

determineMethod

protected Method determineMethod(Class clazz)

Description copied from class: DynamicPropertyGetterBase

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

Specified by:

determineMethod in class DynamicPropertyGetterBase

Parameters:

clazz - to search for a matching method

Returns:

method if found, or null if no matching method exists

determineMethodCodegen

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

Specified by:

determineMethodCodegen in class DynamicPropertyGetterBase

call

protected Object call(DynamicPropertyDescriptor descriptor,
                      Object underlying)

Description copied from class: DynamicPropertyGetterBase

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

Specified by:

call in class DynamicPropertyGetterBase

Parameters:

descriptor - provides method 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 DynamicPropertyGetterBase

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

underlyingExistsCodegen

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

dynamicIndexPropertyDetermineMethod

public static Method dynamicIndexPropertyDetermineMethod(Class clazz,
                                                         String getterMethodName)

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

Parameters:

clazz - class

getterMethodName - method

Returns:

null or method

dynamicIndexedPropertyGet

public static Object dynamicIndexedPropertyGet(DynamicPropertyDescriptor descriptor,
                                               Object underlying,
                                               Object[] parameters,
                                               int index)

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

Parameters:

descriptor - descriptor

underlying - target

parameters - params

index - idx

Returns:

null or method

dynamicIndexedPropertyExists

public static boolean dynamicIndexedPropertyExists(DynamicPropertyDescriptor descriptor,
                                                   Object underlying,
                                                   int index)

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

Parameters:

descriptor - descriptor

underlying - target

index - idx

Returns:

null or method