com.espertech.esper.event.bean

Class ListFieldPropertyGetter

java.lang.Object

com.espertech.esper.event.bean.BaseNativePropertyGetter

com.espertech.esper.event.bean.ListFieldPropertyGetter

All Implemented Interfaces:

EventPropertyGetter, EventPropertyGetterIndexed, BeanEventPropertyGetter, EventPropertyGetterAndIndexed, EventPropertyGetterSPI

public class ListFieldPropertyGetter
extends BaseNativePropertyGetter
implements BeanEventPropertyGetter, EventPropertyGetterAndIndexed

Getter for a list property backed by a field, identified by a given index, using vanilla reflection.

Constructor Summary

Constructors

Constructor and Description
ListFieldPropertyGetter(Field field, int index, EventAdapterService eventAdapterService) Constructor.

Method Summary

Modifier and Type	Method and Description
CodegenExpression	codegenEventBeanExists(CodegenExpression beanExpression, CodegenContext context)
CodegenExpression	codegenEventBeanGet(CodegenExpression beanExpression, CodegenContext context)
CodegenExpression	codegenUnderlyingExists(CodegenExpression underlyingExpression, CodegenContext context)
CodegenExpression	codegenUnderlyingGet(CodegenExpression underlyingExpression, CodegenContext context)
Object	get(EventBean obj) Return the value for the property in the event object specified when the instance was obtained.
Object	get(EventBean eventBean, int index) Return the value for the property in the event object specified when the instance was obtained.
Object	getBeanProp(Object object) Returns the property as an object.
Class	getBeanPropType()
Class	getTargetType()
boolean	isBeanExistsProperty(Object object) Returns true if the dynamic property exists.
boolean	isExistsProperty(EventBean eventBean) Returns true if the property exists, or false if the type does not have such a property.
String	toString()

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

codegenEventBeanFragment, codegenUnderlyingFragment, getFragment, getFragmentDynamic, toFragmentArray, toFragmentIterable

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.espertech.esper.event.EventPropertyGetterSPI

codegenEventBeanFragment, codegenUnderlyingFragment

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

getFragment

Constructor Detail

ListFieldPropertyGetter

public ListFieldPropertyGetter(Field field,
                               int index,
                               EventAdapterService eventAdapterService)

Constructor.

Parameters:

field - is the field to use to retrieve a value from the object

index - is tge index within the array to get the property from

eventAdapterService - factory for event beans and event types

Method Detail

get

public Object get(EventBean eventBean,
                  int index)
           throws PropertyAccessException

Description copied from interface: EventPropertyGetterIndexed

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 EventPropertyGetterIndexed

Parameters:

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

index - the index value

Returns:

value of indexed property in event

Throws:

PropertyAccessException - to indicate that property access failed

getBeanProp

public Object getBeanProp(Object object)
                   throws PropertyAccessException

Description copied from interface: BeanEventPropertyGetter

Returns the property as an object.

Specified by:

getBeanProp in interface BeanEventPropertyGetter

Parameters:

object - to evaluate

Returns:

property of object

Throws:

PropertyAccessException - if access failed

isBeanExistsProperty

public boolean isBeanExistsProperty(Object object)

Description copied from interface: BeanEventPropertyGetter

Returns true if the dynamic property exists.

Specified by:

isBeanExistsProperty in interface BeanEventPropertyGetter

Parameters:

object - to evaluate

Returns:

indicator if property exists

get

public final Object get(EventBean obj)
                 throws PropertyAccessException

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

Throws:

PropertyAccessException - to indicate that property access failed

toString

public String toString()

Overrides:

toString in class Object

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

getBeanPropType

public Class getBeanPropType()

Specified by:

getBeanPropType in interface BeanEventPropertyGetter

Specified by:

getBeanPropType in class BaseNativePropertyGetter

getTargetType

public Class getTargetType()

Specified by:

getTargetType in interface BeanEventPropertyGetter

Specified by:

getTargetType in class BaseNativePropertyGetter

codegenEventBeanGet

public CodegenExpression codegenEventBeanGet(CodegenExpression beanExpression,
                                             CodegenContext context)

Specified by:

codegenEventBeanGet in interface EventPropertyGetterSPI

codegenEventBeanExists

public CodegenExpression codegenEventBeanExists(CodegenExpression beanExpression,
                                                CodegenContext context)

Specified by:

codegenEventBeanExists in interface EventPropertyGetterSPI

codegenUnderlyingGet

public CodegenExpression codegenUnderlyingGet(CodegenExpression underlyingExpression,
                                              CodegenContext context)

Specified by:

codegenUnderlyingGet in interface EventPropertyGetterSPI

codegenUnderlyingExists

public CodegenExpression codegenUnderlyingExists(CodegenExpression underlyingExpression,
                                                 CodegenContext context)

Specified by:

codegenUnderlyingExists in interface EventPropertyGetterSPI