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

Class NestedPropertyGetter

java.lang.Object

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

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

All Implemented Interfaces:

EventPropertyGetter, EventPropertyValueGetter, BeanEventPropertyGetter, EventPropertyGetterSPI, EventPropertyValueGetterForge

public class NestedPropertyGetter
extends BaseNativePropertyGetter
implements BeanEventPropertyGetter

Getter for one or more levels deep nested properties.

Field Summary

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

isFragmentable, returnType

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

EPTYPE, EPTYPEARRAY

Constructor Summary

Constructors

Constructor	Description
NestedPropertyGetter(List<EventPropertyGetter> getterChain, EventBeanTypedEventFactory eventBeanTypedEventFactory, EPTypeClass type, BeanEventTypeFactory beanEventTypeFactory)

Method Summary

Modifier and Type	Method	Description
CodegenExpression	eventBeanExistsCodegen(CodegenExpression beanExpression, CodegenMethodScope codegenMethodScope, CodegenClassScope codegenClassScope)
CodegenExpression	eventBeanGetCodegen(CodegenExpression beanExpression, CodegenMethodScope codegenMethodScope, CodegenClassScope codegenClassScope)
Object	get(EventBean eventBean)	Return the value for the property in the event object specified when the instance was obtained.
Object	getBeanProp(Object value)	Returns the property as an object.
EPTypeClass	getTargetType()
boolean	isBeanExistsProperty(Object value)	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.
CodegenExpression	underlyingExistsCodegen(CodegenExpression underlyingExpression, CodegenMethodScope codegenMethodScope, CodegenClassScope codegenClassScope)
CodegenExpression	underlyingGetCodegen(CodegenExpression underlyingExpression, CodegenMethodScope codegenMethodScope, CodegenClassScope codegenClassScope)

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

eventBeanFragmentCodegen, getBeanPropType, getFragment, getFragmentDynamic, getFragmentFromValue, toFragmentArray, toFragmentIterable, underlyingFragmentCodegen

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.espertech.esper.common.internal.event.bean.core.BeanEventPropertyGetter

getBeanPropType

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

getFragment

Methods inherited from interface com.espertech.esper.common.internal.event.core.EventPropertyGetterSPI

eventBeanFragmentCodegen, underlyingFragmentCodegen

Constructor Details

NestedPropertyGetter

public NestedPropertyGetter(List<EventPropertyGetter> getterChain,
 EventBeanTypedEventFactory eventBeanTypedEventFactory,
 EPTypeClass type,
 BeanEventTypeFactory beanEventTypeFactory)

Method Details

getBeanProp

public Object getBeanProp(Object value)
                   throws PropertyAccessException

Description copied from interface: BeanEventPropertyGetter

Returns the property as an object.

Specified by:

getBeanProp in interface BeanEventPropertyGetter

Parameters:

value - to evaluate

Returns:

property of object

Throws:

PropertyAccessException - if access failed

isBeanExistsProperty

public boolean isBeanExistsProperty(Object value)

Description copied from interface: BeanEventPropertyGetter

Returns true if the dynamic property exists.

Specified by:

isBeanExistsProperty in interface BeanEventPropertyGetter

Parameters:

value - to evaluate

Returns:

indicator if property exists

get

public Object get(EventBean eventBean)
           throws PropertyAccessException

Description copied from interface: EventPropertyValueGetter

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 EventPropertyValueGetter

Parameters:

eventBean - 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

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

getTargetType

public EPTypeClass getTargetType()

Specified by:

getTargetType in interface BeanEventPropertyGetter

Specified by:

getTargetType in class BaseNativePropertyGetter

eventBeanGetCodegen

public CodegenExpression eventBeanGetCodegen(CodegenExpression beanExpression,
 CodegenMethodScope codegenMethodScope,
 CodegenClassScope codegenClassScope)

Specified by:

eventBeanGetCodegen in interface EventPropertyValueGetterForge

eventBeanExistsCodegen

public CodegenExpression eventBeanExistsCodegen(CodegenExpression beanExpression,
 CodegenMethodScope codegenMethodScope,
 CodegenClassScope codegenClassScope)

Specified by:

eventBeanExistsCodegen in interface EventPropertyGetterSPI

underlyingGetCodegen

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

Specified by:

underlyingGetCodegen in interface EventPropertyGetterSPI

underlyingExistsCodegen

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

Specified by:

underlyingExistsCodegen in interface EventPropertyGetterSPI