net.sf.saxon.expr
Class EagerLetExpression
- Binding, EvaluableItem, InstructionInfoProvider, SequenceIterable, Serializable, SourceLocator, TailCallReturner
public class EagerLetExpression
An EagerLetExpression is the same as a LetExpression except that the variable is evaluated using
eager evaluation rather than lazy evaluation. This is used when performing diagnostic tracing.
addReference , checkPermittedContents , computeCardinality , computeSpecialProperties , copy , eval , evaluateItem , explain , getItemType , getNominalReferenceCount , implementsStaticTypeCheck , isIndexedVariable , iterate , iterateEvents , markTailFunctionCalls , optimize , process , processLeavingTail , promote , setIndexedVariable , staticTypeCheck , typeCheck |
addToPathMap , evaluateVariable , extendBindingList , getAction , getLocalSlotNumber , getRequiredSlots , getRequiredType , getSequence , getVariableName , getVariableQName , isAssignable , isGlobal , iterateSubExpressions , promote , promoteWhereClause , refineTypeInformation , replaceSubExpression , setAction , setRequiredType , setSequence , setSlotNumber , setVariableQName , simplify , suppressValidation |
addToPathMap , adoptChildExpression , checkPermittedContents , computeCardinality , computeDependencies , computeSpecialProperties , computeStaticProperties , copy , display , doPromotion , dynamicError , effectiveBooleanValue , evaluateAsString , evaluateItem , explain , explain , findParentOf , getCardinality , getColumnNumber , getConstructType , getContainer , getDependencies , getExecutable , getHostLanguage , getImplementationMethod , getInstructionInfo , getIntrinsicDependencies , getItemType , getLineNumber , getLocationId , getLocationProvider , getPublicId , getSlotsUsed , getSpecialProperties , getSystemId , hasLoopingSubexpression , implementsStaticTypeCheck , iterate , iterateEvents , iterateSubExpressions , markTailFunctionCalls , optimize , process , promote , replaceSubExpression , resetLocalStaticProperties , setContainer , setFiltered , setFlattened , setLocationId , simplify , staticTypeCheck , suppressValidation , toString , typeCheck , typeError |
EagerLetExpression
public EagerLetExpression()
optimize
public Expression optimize(ExpressionVisitor visitor,
ItemType contextItemType)
throws XPathException
Perform optimisation of an expression and its subexpressions. This is the third and final
phase of static optimization.
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 LetExpression
visitor
- an expression visitorcontextItemType
- 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
- the original expression, rewritten if appropriate to optimize execution
XPathException
- if an error is discovered during this phase
(typically a type error)