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

Class DOMNestedPropertyGetter

java.lang.Object

com.espertech.esper.common.internal.event.xml.DOMNestedPropertyGetter

All Implemented Interfaces:

EventPropertyGetter, EventPropertyValueGetter, EventPropertyGetterSPI, EventPropertyValueGetterForge, DOMPropertyGetter

public class DOMNestedPropertyGetter
extends Object
implements EventPropertyGetterSPI, DOMPropertyGetter

Getter for nested properties in a DOM tree.

Field Summary

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

EPTYPE, EPTYPEARRAY

Constructor Summary

Constructors

Constructor	Description
DOMNestedPropertyGetter(List<EventPropertyGetter> getterChain, FragmentFactorySPI fragmentFactory)	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 obj)	Returns EventBean or array of EventBean for a property name or property expression.
Object	getValueAsFragment(Node node)	Returns a property value as a fragment.
CodegenExpression	getValueAsFragmentCodegen(CodegenExpression value, CodegenMethodScope codegenMethodScope, CodegenClassScope codegenClassScope)
Node	getValueAsNode(Node node)	Returns a property value as a node.
Node[]	getValueAsNodeArray(Node node)	Returns a property value that is indexed as a node array.
CodegenExpression	getValueAsNodeArrayCodegen(CodegenExpression value, CodegenMethodScope codegenMethodScope, CodegenClassScope codegenClassScope)
CodegenExpression	getValueAsNodeCodegen(CodegenExpression value, CodegenMethodScope codegenMethodScope, CodegenClassScope codegenClassScope)
boolean	isExistsProperty(EventBean obj)	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	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

Constructor Details

DOMNestedPropertyGetter

public DOMNestedPropertyGetter(List<EventPropertyGetter> getterChain,
 FragmentFactorySPI fragmentFactory)

Ctor.

Parameters:

getterChain - is the chain of getters to retrieve each nested property

fragmentFactory - for creating fragments

Method Details

getValueAsFragment

public Object getValueAsFragment(Node node)

Description copied from interface: DOMPropertyGetter

Returns a property value as a fragment.

Specified by:

getValueAsFragment in interface DOMPropertyGetter

Parameters:

node - to evaluate

Returns:

fragment

getValueAsNodeArray

public Node[] getValueAsNodeArray(Node node)

Description copied from interface: DOMPropertyGetter

Returns a property value that is indexed as a node array.

Specified by:

getValueAsNodeArray in interface DOMPropertyGetter

Parameters:

node - to evaluate

Returns:

nodes

getValueAsNode

public Node getValueAsNode(Node node)

Description copied from interface: DOMPropertyGetter

Returns a property value as a node.

Specified by:

getValueAsNode in interface DOMPropertyGetter

Parameters:

node - to evaluate

Returns:

value node

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 obj)

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:

obj - 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 obj)
                   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:

obj - 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

getValueAsNodeCodegen

public CodegenExpression getValueAsNodeCodegen(CodegenExpression value,
 CodegenMethodScope codegenMethodScope,
 CodegenClassScope codegenClassScope)

Specified by:

getValueAsNodeCodegen in interface DOMPropertyGetter

getValueAsNodeArrayCodegen

public CodegenExpression getValueAsNodeArrayCodegen(CodegenExpression value,
 CodegenMethodScope codegenMethodScope,
 CodegenClassScope codegenClassScope)

Specified by:

getValueAsNodeArrayCodegen in interface DOMPropertyGetter

getValueAsFragmentCodegen

public CodegenExpression getValueAsFragmentCodegen(CodegenExpression value,
 CodegenMethodScope codegenMethodScope,
 CodegenClassScope codegenClassScope)

Specified by:

getValueAsFragmentCodegen in interface DOMPropertyGetter