com.espertech.esper.common.internal.event.json.getter.provided

Class JsonGetterSimpleProvidedBase

java.lang.Object

com.espertech.esper.common.internal.event.json.getter.provided.JsonGetterSimpleProvidedBase

All Implemented Interfaces:

EventPropertyGetter, EventPropertyValueGetter, EventPropertyGetterSPI, EventPropertyValueGetterForge, JsonEventPropertyGetter

Direct Known Subclasses:

JsonGetterSimpleProvidedWFragmentArray, JsonGetterSimpleProvidedWFragmentSimple

public abstract class JsonGetterSimpleProvidedBase
extends Object
implements JsonEventPropertyGetter

Property getter for Json underlying fields.

Field Summary

Fields

Modifier and Type	Field and Description
protected EventBeanTypedEventFactory	eventBeanTypedEventFactory
protected Field	field
protected EventType	fragmentType

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

EPTYPE, EPTYPEARRAY

Constructor Summary

Constructors

Constructor and Description
JsonGetterSimpleProvidedBase(Field field, EventType fragmentType, EventBeanTypedEventFactory eventBeanTypedEventFactory)

Method Summary

Modifier and Type	Method and 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	getFragment(EventBean eventBean) Returns EventBean or array of EventBean for a property name or property expression.
boolean	getJsonExists(Object object)
Object	getJsonProp(Object object)
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 java.lang.Object

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

Methods inherited from interface com.espertech.esper.common.internal.event.json.getter.core.JsonEventPropertyGetter

getJsonFragment

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

eventBeanFragmentCodegen, underlyingFragmentCodegen

Field Detail

field

protected final Field field

fragmentType

protected final EventType fragmentType

eventBeanTypedEventFactory

protected final EventBeanTypedEventFactory eventBeanTypedEventFactory

Constructor Detail

JsonGetterSimpleProvidedBase

public JsonGetterSimpleProvidedBase(Field field,
                                    EventType fragmentType,
                                    EventBeanTypedEventFactory eventBeanTypedEventFactory)

Method Detail

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

getJsonProp

public Object getJsonProp(Object object)
                   throws PropertyAccessException

Specified by:

getJsonProp in interface JsonEventPropertyGetter

Throws:

PropertyAccessException

eventBeanGetCodegen

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

Specified by:

eventBeanGetCodegen in interface EventPropertyValueGetterForge

underlyingGetCodegen

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

Specified by:

underlyingGetCodegen in interface EventPropertyGetterSPI

eventBeanExistsCodegen

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

Specified by:

eventBeanExistsCodegen in interface EventPropertyGetterSPI

underlyingExistsCodegen

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

Specified by:

underlyingExistsCodegen in interface EventPropertyGetterSPI

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

getJsonExists

public boolean getJsonExists(Object object)
                      throws PropertyAccessException

Specified by:

getJsonExists in interface JsonEventPropertyGetter

Throws:

PropertyAccessException