|
||||||||||
PREV CLASS NEXT CLASS | FRAMES NO FRAMES | |||||||||
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |
java.lang.Objectnet.esper.event.xml.XPathPropertyGetter
public class XPathPropertyGetter
Getter for properties of DOM xml events.
Constructor Summary | |
---|---|
XPathPropertyGetter(String propertyName,
XPathExpression xPathExpression,
QName resultType)
Ctor. |
Method Summary | |
---|---|
Object |
get(EventBean eventBean)
Return the value for the property in the event object specified when the instance was obtained. |
Class |
getResultClass()
Returns type of event property. |
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 |
---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
---|
public XPathPropertyGetter(String propertyName, XPathExpression xPathExpression, QName resultType)
propertyName
- is the name of the event property for which this getter gets valuesxPathExpression
- is a compile XPath expressionresultType
- is the resulting typeMethod Detail |
---|
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 Class getResultClass()
TypedEventPropertyGetter
getResultClass
in interface TypedEventPropertyGetter
public 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
|
||||||||||
PREV CLASS NEXT CLASS | FRAMES NO FRAMES | |||||||||
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |