java.io.Serializable
, javax.xml.transform.SourceLocator
, Binding
, Container
, Expression
, TailCallReturner
, InstructionInfoProvider
public class EagerLetExpression extends LetExpression
action, declaration, nameCode, sequence, slotNumber, variableName
locationId, staticProperties
EVALUATE_METHOD, ITERATE_METHOD, PROCESS_METHOD
evaluationMode, refCount
Constructor | Description |
---|---|
EagerLetExpression() |
Modifier and Type | Method | Description |
---|---|---|
Expression |
optimize(Optimizer opt,
StaticContext env,
ItemType contextItemType) |
Perform optimisation of an expression and its subexpressions.
|
evaluateVariable, extendBindingList, getAction, getLocalSlotNumber, getRequiredSlots, getSequence, getVariableDeclaration, getVariableFingerprint, getVariableName, getVariableNameCode, isAssignable, isGlobal, iterateSubExpressions, promoteWhereClause, replaceSubExpression, setAction, setSequence, setSlotNumber, setVariableDeclaration, simplify, suppressValidation
adoptChildExpression, computeDependencies, computeStaticProperties, doPromotion, dynamicError, effectiveBooleanValue, evaluateAsString, getCardinality, getColumnNumber, getConstructType, getDependencies, getExecutable, getHostLanguage, getImplementationMethod, getInstructionInfo, getIntrinsicDependencies, getLineNumber, getLocationId, getLocationProvider, getParentExpression, getPublicId, getSlotsUsed, getSpecialProperties, getSystemId, hasBadParentPointer, resetStaticProperties, setLocationId, setParentExpression, setParentExpression, typeError
checkPermittedContents, computeCardinality, computeSpecialProperties, display, eval, evaluateItem, getItemType, iterate, markTailFunctionCalls, process, processLeavingTail, promote, setIndexedVariable, typeCheck
public Expression optimize(Optimizer opt, StaticContext env, ItemType contextItemType) throws XPathException
LetExpression
This method is called after all references to functions and variables have been resolved to the declaration of the function or variable, and after all type checking has been done.
optimize
in interface Expression
optimize
in class LetExpression
opt
- the optimizer in use. This provides access to supporting functions; it also allows
different optimization strategies to be used in different circumstances.env
- the static context of the expressioncontextItemType
- the static type of "." at the point where this expression is invoked.
The parameter is set to null if it is known statically that the context item will be undefined.
If the type of the context item is not known statically, the argument is set to
Type.ITEM_TYPE
net.sf.saxon.trans.StaticError
- if an error is discovered during this phase
(typically a type error)XPathException