public final class IndexedLookupExpression extends Expression
EFFECTIVE_BOOLEAN_VALUE, EVALUATE_METHOD, ITEM_FEED_METHOD, ITERATE_METHOD, MAX_SEQUENCE_LENGTH, MAX_STRING_LENGTH, PROCESS_METHOD, staticProperties, UNBOUNDED_LOWER, UNBOUNDED_UPPER, UPDATE_METHOD, WATCH_METHOD
Constructor and Description |
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IndexedLookupExpression(VariableReference base,
Expression lookup,
AtomicComparer comparer)
Constructor
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Modifier and Type | Method and Description |
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int |
computeCardinality()
Get the static cardinality of this expression
|
int |
computeDependencies()
Determine which aspects of the context the expression depends on.
|
int |
computeHashCode()
get HashCode for comparing two expressions
|
int |
computeSpecialProperties()
Get the static properties of this expression (other than its type).
|
Expression |
copy(RebindingMap rebindings)
Copy an expression.
|
boolean |
effectiveBooleanValue(XPathContext context)
Get the effective boolean value of the expression.
|
boolean |
equals(java.lang.Object other)
Is this expression the same as another expression?
|
Item |
evaluateItem(XPathContext context)
Evaluate an expression as a single item.
|
void |
export(ExpressionPresenter destination)
Diagnostic print of expression structure.
|
AtomicComparer |
getAtomicComparer()
Get the atomic comparer used
|
VariableReference |
getBase() |
VariableReference |
getBaseExpression()
Get the underlying expression
|
java.lang.String |
getExpressionName()
Get a name identifying the kind of expression, in terms meaningful to a user.
|
int |
getImplementationMethod()
An implementation of Expression must provide at least one of the methods evaluateItem(), iterate(), or process().
|
ItemType |
getItemType()
Get the data type of the items returned
|
Expression |
getLookup()
Get the lookup expression
|
Expression |
getUseExpression()
Get the expression that computes the key
|
java.lang.Iterable<Operand> |
operands()
Get the immediate sub-expressions of this expression, with information about the relationship
of each expression to its parent expression.
|
void |
setBase(VariableReference base) |
void |
setLookup(Expression lookup) |
Expression |
typeCheck(ExpressionVisitor visitor,
ContextItemStaticInfo contextInfo)
Type-check the expression
|
addToPathMap, adoptChildExpression, allowExtractingCommonSubexpressions, checkedOperands, checkForUpdatingSubexpressions, checkPermittedContents, computeStaticProperties, dynamicError, evaluateAsString, evaluatePendingUpdates, explain, getCardinality, getConfiguration, getConstructType, getCost, getDependencies, getEvaluationMethod, getExtraProperty, getIntegerBounds, getInterpretedExpression, getIntrinsicDependencies, getLocalRetainedStaticContext, getLocation, getNetCost, getObjectName, getPackageData, getParentExpression, getProperties, getProperty, getRetainedStaticContext, getScopingExpression, getSlotsUsed, getSpecialProperties, getStaticBaseURI, getStaticBaseURIString, getStaticType, getStaticUType, getStreamerName, hasCompatibleStaticContext, hashCode, hasVariableBinding, identityHashCode, implementsStaticTypeCheck, isCallOn, isCallOnSystemFunction, isIdentical, isInstruction, isLiftable, isMultiThreaded, isSameExpression, isStaticPropertiesKnown, isSubtreeExpression, isUpdatingExpression, isVacuousExpression, iterate, markTailFunctionCalls, operandList, operandSparseList, optimize, optimizeChildren, process, resetLocalStaticProperties, restoreParentPointers, setEvaluationMethod, setExtraProperty, setFiltered, setFlattened, setLocation, setParentExpression, setRetainedStaticContext, setRetainedStaticContextLocally, setRetainedStaticContextThoroughly, setStaticProperty, simplify, simplifyChildren, staticTypeCheck, suppressValidation, toPattern, toShortString, toString, typeCheckChildren, typeError, unordered, verifyParentPointers, verifyParentPointers
public IndexedLookupExpression(VariableReference base, Expression lookup, AtomicComparer comparer)
base
- A sequence expression denoting the sequence to be searchedlookup
- An expression defining value to be soughtcomparer
- Comparison algorithm for comparing valuespublic java.lang.Iterable<Operand> operands()
Expression
If the expression is a Callable, then it is required that the order of the operands returned by this function is the same as the order of arguments supplied to the corresponding call() method.
operands
in class Expression
public VariableReference getBase()
public void setBase(VariableReference base)
public void setLookup(Expression lookup)
public Expression getLookup()
public ItemType getItemType()
getItemType
in class Expression
public VariableReference getBaseExpression()
public Expression getUseExpression()
public AtomicComparer getAtomicComparer()
public Expression typeCheck(ExpressionVisitor visitor, ContextItemStaticInfo contextInfo)
typeCheck
in class Expression
visitor
- an expression visitorcontextInfo
- information about the existence and type of the context itempublic Expression copy(RebindingMap rebindings)
copy
in class Expression
rebindings
- public int computeCardinality()
computeCardinality
in class Expression
public int computeSpecialProperties()
computeSpecialProperties
in class Expression
public int getImplementationMethod()
Expression
getImplementationMethod
in class Expression
Expression.ITERATE_METHOD
or Expression.EVALUATE_METHOD
or
Expression.PROCESS_METHOD
public boolean equals(java.lang.Object other)
equals
in class java.lang.Object
other
- the expression to be compared with this onepublic int computeHashCode()
computeHashCode
in class Expression
public boolean effectiveBooleanValue(XPathContext context) throws XPathException
Expression
effectiveBooleanValue
in class Expression
context
- The context in which the expression is to be evaluatedXPathException
- if any dynamic error occurs evaluating the
expressionpublic Item evaluateItem(XPathContext context) throws XPathException
Expression
evaluateItem
in class Expression
context
- The context in which the expression is to be evaluatedXPathException
- if any dynamic error occurs evaluating the
expressionpublic int computeDependencies()
computeDependencies
in class Expression
public java.lang.String getExpressionName()
getExpressionName
in class Expression
public void export(ExpressionPresenter destination) throws XPathException
export
in interface ExportAgent
export
in class Expression
destination
- the expression presenter used to display the structureXPathException
- if the export fails, for example if an expression is found that won't work
in the target environment.Copyright (c) 2004-2018 Saxonica Limited. All rights reserved.