Package com.espertech.esper.common.internal.event.map

Class MapPropertyGetterDefaultBase

java.lang.Object

com.espertech.esper.common.internal.event.map.MapPropertyGetterDefaultBase

All Implemented Interfaces:

EventPropertyGetter, EventPropertyValueGetter, EventPropertyGetterSPI, EventPropertyValueGetterForge, MapEventPropertyGetter

Direct Known Subclasses:

MapPropertyGetterDefaultMap, MapPropertyGetterDefaultNoFragment, MapPropertyGetterDefaultObjectArray

public abstract class MapPropertyGetterDefaultBase
extends Object
implements MapEventPropertyGetter

Getter for map entry.

Field Summary

Fields

Modifier and Type	Field	Description
protected final EventBeanTypedEventFactory	eventBeanTypedEventFactory
protected final EventType	fragmentEventType

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

EPTYPE, EPTYPEARRAY

Constructor Summary

Constructors

Constructor	Description
MapPropertyGetterDefaultBase(String propertyNameAtomic, EventType fragmentEventType, EventBeanTypedEventFactory eventBeanTypedEventFactory)	Ctor.

Method Summary

Modifier and Type	Method	Description
CodegenExpression	eventBeanExistsCodegen(CodegenExpression beanExpression, CodegenMethodScope codegenMethodScope, CodegenClassScope codegenClassScope)
CodegenExpression	eventBeanFragmentCodegen(CodegenExpression beanExpression, CodegenMethodScope codegenMethodScope, CodegenClassScope codegenClassScope)
CodegenExpression	eventBeanGetCodegen(CodegenExpression beanExpression, CodegenMethodScope codegenMethodScope, CodegenClassScope codegenClassScope)
Object	get(EventBean obj)	Return the value for the property in the event object specified when the instance was obtained.
Object	getFragment(EventBean eventBean)	Returns EventBean or array of EventBean for a property name or property expression.
Object	getMap(Map<String,Object> map)	Returns a property of an event.
protected abstract Object	handleCreateFragment(Object value)
protected abstract CodegenExpression	handleCreateFragmentCodegen(CodegenExpression value, CodegenClassScope codegenClassScope)
boolean	isExistsProperty(EventBean eventBean)	Returns true if the property exists, or false if the type does not have such a property.
boolean	isMapExistsProperty(Map<String,Object> map)	Exists-function for properties in a map-type event.
CodegenExpression	underlyingExistsCodegen(CodegenExpression underlyingExpression, CodegenMethodScope codegenMethodScope, CodegenClassScope codegenClassScope)
CodegenExpression	underlyingFragmentCodegen(CodegenExpression underlyingExpression, CodegenMethodScope codegenMethodScope, CodegenClassScope codegenClassScope)
CodegenExpression	underlyingGetCodegen(CodegenExpression underlyingExpression, CodegenMethodScope codegenMethodScope, CodegenClassScope codegenClassScope)

Methods inherited from class java.lang.Object

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

Field Details

fragmentEventType

protected final EventType fragmentEventType

eventBeanTypedEventFactory

protected final EventBeanTypedEventFactory eventBeanTypedEventFactory

Constructor Details

MapPropertyGetterDefaultBase

public MapPropertyGetterDefaultBase(String propertyNameAtomic,
 EventType fragmentEventType,
 EventBeanTypedEventFactory eventBeanTypedEventFactory)

Ctor.

Parameters:

propertyNameAtomic - property name

fragmentEventType - fragment type

eventBeanTypedEventFactory - factory for event beans and event types

Method Details

handleCreateFragment

protected abstract Object handleCreateFragment(Object value)

handleCreateFragmentCodegen

protected abstract CodegenExpression handleCreateFragmentCodegen(CodegenExpression value,
 CodegenClassScope codegenClassScope)

getMap

public Object getMap(Map<String,Object> map)
              throws PropertyAccessException

Description copied from interface: MapEventPropertyGetter

Returns a property of an event.

Specified by:

getMap in interface MapEventPropertyGetter

Parameters:

map - to interrogate

Returns:

property value

Throws:

PropertyAccessException - for property access errors

isMapExistsProperty

public boolean isMapExistsProperty(Map<String,Object> map)

Description copied from interface: MapEventPropertyGetter

Exists-function for properties in a map-type event.

Specified by:

isMapExistsProperty in interface MapEventPropertyGetter

Parameters:

map - to interrogate

Returns:

indicator

get

public Object get(EventBean obj)
           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:

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

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 eventBean)
                   throws PropertyAccessException

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:

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

Returns:

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

Throws:

PropertyAccessException - - if there is no property of the specified name, or the property cannot be accessed

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

eventBeanFragmentCodegen

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

Specified by:

eventBeanFragmentCodegen 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

underlyingFragmentCodegen

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

Specified by:

underlyingFragmentCodegen in interface EventPropertyGetterSPI