public class SingletonComparison extends BinaryExpression implements ComparisonExpression
operand0, operand1, operator
EVALUATE_METHOD, EVENT_FEED_METHOD, ITEM_FEED_METHOD, ITERATE_METHOD, locationId, PROCESS_METHOD, PUSH_SELECTION, staticProperties, WATCH_METHOD
Constructor and Description |
---|
SingletonComparison(Expression p1,
int operator,
Expression p2,
boolean checkTypes)
Create a singleton comparison - that is, a comparison between two singleton (0:1) sequences
using the general comparison semantics
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Modifier and Type | Method and Description |
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int |
computeCardinality()
Determine the static cardinality.
|
boolean |
convertsUntypedToOther()
Determine whether untyped atomic values should be converted to the type of the other operand
|
Expression |
copy()
Copy an expression.
|
boolean |
effectiveBooleanValue(XPathContext context)
Evaluate the expression in a boolean context
|
Item |
evaluateItem(XPathContext context)
Evaluate the expression in a given context
|
protected void |
explainExtraAttributes(ExpressionPresenter out)
Add subclass-specific attributes to the expression tree explanation.
|
AtomicComparer |
getAtomicComparer()
Get the AtomicComparer used to compare atomic values.
|
ItemType |
getItemType(TypeHierarchy th)
Determine the data type of the expression
|
int |
getSingletonOperator()
Get the primitive (singleton) operator used: one of Token.FEQ, Token.FNE, Token.FLT, Token.FGT,
Token.FLE, Token.FGE
|
boolean |
needsRuntimeComparabilityCheck()
Determine whether a run-time check is needed to check that the types of the arguments
are comparable
|
void |
setAtomicComparer(AtomicComparer comp) |
computeSpecialProperties, displayOperator, equals, explain, getOperands, getOperator, hashCode, isAssociative, isCommutative, isInverse, iterateSubExpressions, optimize, promote, replaceSubExpression, setFlattened, simplify, toString, typeCheck
addToPathMap, adoptChildExpression, checkForUpdatingSubexpressions, checkPermittedContents, computeDependencies, computeStaticProperties, doPromotion, dynamicError, evaluateAsString, evaluatePendingUpdates, explain, getCardinality, getColumnNumber, getColumnNumber, getConstructType, getContainer, getDependencies, getEvaluationMethod, getExecutable, getExpressionName, getHostLanguage, getImplementationMethod, getIntrinsicDependencies, getLineNumber, getLineNumber, getLocationId, getLocationProvider, getObjectName, getProperties, getProperty, getPublicId, getSlotsUsed, getSpecialProperties, getSystemId, getSystemId, hasLoopingSubexpression, implementsStaticTypeCheck, isSubtreeExpression, isUpdatingExpression, isVacuousExpression, iterate, iterateEvents, iterateSameFocusSubExpressions, markTailFunctionCalls, process, resetLocalStaticProperties, setContainer, setEvaluationMethod, setFiltered, setLocationId, staticTypeCheck, suppressValidation, typeError
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
getOperands
public SingletonComparison(Expression p1, int operator, Expression p2, boolean checkTypes)
p1
- the first operandoperator
- the operatorp2
- the second operandcheckTypes
- true if a run-time check for comparability of the operand types is neededpublic void setAtomicComparer(AtomicComparer comp)
public AtomicComparer getAtomicComparer()
ComparisonExpression
getAtomicComparer
in interface ComparisonExpression
public int getSingletonOperator()
ComparisonExpression
getSingletonOperator
in interface ComparisonExpression
public boolean convertsUntypedToOther()
convertsUntypedToOther
in interface ComparisonExpression
public int computeCardinality()
computeCardinality
in class BinaryExpression
StaticProperty.ALLOWS_ZERO_OR_ONE
,
StaticProperty.EXACTLY_ONE
, StaticProperty.ALLOWS_ONE_OR_MORE
,
StaticProperty.ALLOWS_ZERO_OR_MORE
public ItemType getItemType(TypeHierarchy th)
getItemType
in class Expression
th
- the type hierarchy cachepublic Expression copy()
copy
in class Expression
public boolean needsRuntimeComparabilityCheck()
public Item evaluateItem(XPathContext context) throws XPathException
evaluateItem
in interface EvaluableItem
evaluateItem
in class Expression
context
- the given context for evaluationXPathException
- if any dynamic error occurs evaluating the
expressionpublic boolean effectiveBooleanValue(XPathContext context) throws XPathException
effectiveBooleanValue
in class Expression
context
- the given context for evaluationXPathException
- if any dynamic error occurs evaluating the
expressionprotected void explainExtraAttributes(ExpressionPresenter out)
BinaryExpression
explainExtraAttributes
in class BinaryExpression
out
- the output destination for the displayed expression tree