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java.lang.Objectcom.espertech.esper.event.property.NestedPropertyGetter
public class NestedPropertyGetter
Getter for one or more levels deep nested properties.
Constructor Summary | |
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NestedPropertyGetter(List<EventPropertyGetter> getterChain,
BeanEventTypeFactory beanEventTypeFactory)
Ctor. |
Method Summary | |
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Object |
get(EventBean eventBean)
Return the value for the property in the event object specified when the instance was obtained. |
boolean |
isExistsProperty(EventBean eventBean)
Returns true if the property exists, or false if the type does not have such a property. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public NestedPropertyGetter(List<EventPropertyGetter> getterChain, BeanEventTypeFactory beanEventTypeFactory)
getterChain
- is the chain of getters to retrieve each nested propertybeanEventTypeFactory
- is the chache and factory for event bean types and event wrappersMethod Detail |
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public Object get(EventBean eventBean) throws PropertyAccessException
EventPropertyGetter
get
in interface EventPropertyGetter
eventBean
- is the event to get the value of a property from
PropertyAccessException
- to indicate that property access failedpublic boolean isExistsProperty(EventBean eventBean)
EventPropertyGetter
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
isExistsProperty
in interface EventPropertyGetter
eventBean
- is the event to check if the dynamic property exists
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