com.espertech.esper.epl.expression.core

Class ExprIdentNodeImpl

java.lang.Object

com.espertech.esper.epl.expression.core.ExprNodeBase

com.espertech.esper.epl.expression.core.ExprIdentNodeImpl

All Implemented Interfaces:

ExprFilterOptimizableNode, ExprForge, ExprIdentNode, ExprNode, ExprNodeRenderable, ExprStreamRefNode, ExprValidator, MetaDefItem, Serializable

public class ExprIdentNodeImpl
extends ExprNodeBase
implements ExprIdentNode, ExprNode, ExprForge

Represents an stream property identifier in a filter expressiun tree.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
ExprIdentNodeImpl(EventType eventType, String propertyName, int streamNumber)
ExprIdentNodeImpl(String unresolvedPropertyName) Ctor.
ExprIdentNodeImpl(String unresolvedPropertyName, String streamOrPropertyName) Ctor.

Method Summary

Modifier and Type	Method and Description
boolean	equalsNode(ExprNode node, boolean ignoreStreamPrefix) Return true if a expression node semantically equals the current node, or false if not.
CodegenExpression	evaluateCodegen(CodegenParamSetExprPremade params, CodegenContext context)
ExprForgeComplexityEnum	getComplexity()
Class	getEvaluationType()
ExprEvaluator	getExprEvaluator()
ExprIdentNodeEvaluator	getExprEvaluatorIdent()
FilterSpecLookupable	getFilterLookupable()
boolean	getFilterLookupEligible()
ExprForge	getForge()
ExprNodeRenderable	getForgeRenderable()
String	getFullUnresolvedName() Returns the unresolved property name in it's complete form, including the stream name if there is one.
ExprPrecedenceEnum	getPrecedence() Returns precedence.
String	getResolvedPropertyName() Return property name as resolved by lookup in streams.
String	getResolvedPropertyNameRoot() Returns the root of the resolved property name, if any.
String	getResolvedStreamName() Returns stream name as resolved by lookup of property in streams.
String	getRootPropertyNameIfAny()
int	getStreamId() Returns stream id supplying the property value.
String	getStreamOrPropertyName() For unit testing, returns stream or property name candidate.
Integer	getStreamReferencedIfAny()
Class	getType()
String	getUnresolvedPropertyName() For unit testing, returns unresolved property name.
boolean	isConstantResult() Returns true if the expression node's evaluation value doesn't depend on any events data, as must be determined at validation time, which is bottom-up and therefore reliably allows each node to determine constant value.
void	setStreamOrPropertyName(String streamOrPropertyName) Set name.
void	toPrecedenceFreeEPL(StringWriter writer)
static void	toPrecedenceFreeEPL(StringWriter writer, String streamOrPropertyName, String unresolvedPropertyName)
String	toString()
ExprNode	validate(ExprValidationContext validationContext)

Methods inherited from class com.espertech.esper.epl.expression.core.ExprNodeBase

accept, accept, acceptChildnodes, addChildNode, addChildNodes, addChildNodeToFront, getChildNodes, replaceUnlistedChildNode, setChildNode, setChildNodes, toEPL

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.espertech.esper.epl.expression.core.ExprNode

accept, accept, acceptChildnodes, addChildNode, addChildNodes, getChildNodes, replaceUnlistedChildNode, setChildNode, setChildNodes

Methods inherited from interface com.espertech.esper.epl.expression.core.ExprNodeRenderable

toEPL

Constructor Detail

ExprIdentNodeImpl

public ExprIdentNodeImpl(String unresolvedPropertyName)

Ctor.

Parameters:

unresolvedPropertyName - is the event property name in unresolved form, ie. unvalidated against streams

ExprIdentNodeImpl

public ExprIdentNodeImpl(String unresolvedPropertyName,
                         String streamOrPropertyName)

Ctor.

Parameters:

unresolvedPropertyName - is the event property name in unresolved form, ie. unvalidated against streams

streamOrPropertyName - is the stream name, or if not a valid stream name a possible nested property name in one of the streams.

ExprIdentNodeImpl

public ExprIdentNodeImpl(EventType eventType,
                         String propertyName,
                         int streamNumber)

Method Detail

getForge

public ExprForge getForge()

Specified by:

getForge in interface ExprNode

getForgeRenderable

public ExprNodeRenderable getForgeRenderable()

Specified by:

getForgeRenderable in interface ExprForge

getEvaluationType

public Class getEvaluationType()

Specified by:

getEvaluationType in interface ExprForge

evaluateCodegen

public CodegenExpression evaluateCodegen(CodegenParamSetExprPremade params,
                                         CodegenContext context)

Specified by:

evaluateCodegen in interface ExprForge

getComplexity

public ExprForgeComplexityEnum getComplexity()

Specified by:

getComplexity in interface ExprForge

getExprEvaluator

public ExprEvaluator getExprEvaluator()

Specified by:

getExprEvaluator in interface ExprForge

getUnresolvedPropertyName

public String getUnresolvedPropertyName()

For unit testing, returns unresolved property name.

Specified by:

getUnresolvedPropertyName in interface ExprIdentNode

Returns:

property name

getStreamOrPropertyName

public String getStreamOrPropertyName()

For unit testing, returns stream or property name candidate.

Specified by:

getStreamOrPropertyName in interface ExprIdentNode

Returns:

stream name, or property name of a nested property of one of the streams

setStreamOrPropertyName

public void setStreamOrPropertyName(String streamOrPropertyName)

Set name.

Specified by:

setStreamOrPropertyName in interface ExprIdentNode

Parameters:

streamOrPropertyName - to use

getFullUnresolvedName

public String getFullUnresolvedName()

Returns the unresolved property name in it's complete form, including the stream name if there is one.

Specified by:

getFullUnresolvedName in interface ExprIdentNode

Returns:

property name

getFilterLookupEligible

public boolean getFilterLookupEligible()

Specified by:

getFilterLookupEligible in interface ExprFilterOptimizableNode

getFilterLookupable

public FilterSpecLookupable getFilterLookupable()

Specified by:

getFilterLookupable in interface ExprFilterOptimizableNode

validate

public ExprNode validate(ExprValidationContext validationContext)
                  throws ExprValidationException

Specified by:

validate in interface ExprValidator

Throws:

ExprValidationException

isConstantResult

public boolean isConstantResult()

Description copied from interface: ExprNode

Returns true if the expression node's evaluation value doesn't depend on any events data, as must be determined at validation time, which is bottom-up and therefore reliably allows each node to determine constant value.

Specified by:

isConstantResult in interface ExprNode

Returns:

true for constant evaluation value, false for non-constant evaluation value

getStreamId

public int getStreamId()

Returns stream id supplying the property value.

Specified by:

getStreamId in interface ExprIdentNode

Returns:

stream number

getStreamReferencedIfAny

public Integer getStreamReferencedIfAny()

Specified by:

getStreamReferencedIfAny in interface ExprStreamRefNode

getRootPropertyNameIfAny

public String getRootPropertyNameIfAny()

Specified by:

getRootPropertyNameIfAny in interface ExprStreamRefNode

getType

public Class getType()

getResolvedStreamName

public String getResolvedStreamName()

Returns stream name as resolved by lookup of property in streams.

Specified by:

getResolvedStreamName in interface ExprIdentNode

Returns:

stream name

getResolvedPropertyName

public String getResolvedPropertyName()

Return property name as resolved by lookup in streams.

Specified by:

getResolvedPropertyName in interface ExprIdentNode

Returns:

property name

getResolvedPropertyNameRoot

public String getResolvedPropertyNameRoot()

Returns the root of the resolved property name, if any.

Specified by:

getResolvedPropertyNameRoot in interface ExprIdentNode

Returns:

root

toString

public String toString()

Overrides:

toString in class Object

toPrecedenceFreeEPL

public void toPrecedenceFreeEPL(StringWriter writer)

Specified by:

toPrecedenceFreeEPL in class ExprNodeBase

toPrecedenceFreeEPL

public static void toPrecedenceFreeEPL(StringWriter writer,
                                       String streamOrPropertyName,
                                       String unresolvedPropertyName)

getPrecedence

public ExprPrecedenceEnum getPrecedence()

Description copied from interface: ExprNode

Returns precedence.

Specified by:

getPrecedence in interface ExprNode

Returns:

precedence

equalsNode

public boolean equalsNode(ExprNode node,
                          boolean ignoreStreamPrefix)

Description copied from interface: ExprNode

Return true if a expression node semantically equals the current node, or false if not.

Concrete implementations should compare the type and any additional information that impact the evaluation of a node.

Specified by:

equalsNode in interface ExprNode

Parameters:

node - to compare to

ignoreStreamPrefix - when the equals-comparison can ignore prefix of event properties

Returns:

true if semantically equal, or false if not equals

getExprEvaluatorIdent

public ExprIdentNodeEvaluator getExprEvaluatorIdent()

Specified by:

getExprEvaluatorIdent in interface ExprIdentNode