Package net.sf.saxon.expr
Class SystemFunctionCall.Optimized
java.lang.Object
net.sf.saxon.expr.Expression
net.sf.saxon.expr.FunctionCall
net.sf.saxon.expr.StaticFunctionCall
net.sf.saxon.expr.SystemFunctionCall
net.sf.saxon.expr.SystemFunctionCall.Optimized
- All Implemented Interfaces:
Callable
,ExportAgent
,Locatable
,Negatable
,IdentityComparable
,Traceable
- Enclosing class:
SystemFunctionCall
Subclass representing a system function call that has been optimized; this overrides the
optimize() method to do nothing, thus ensuring that optimization converges.
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Nested Class Summary
Nested classes/interfaces inherited from class net.sf.saxon.expr.SystemFunctionCall
SystemFunctionCall.Optimized, SystemFunctionCall.SystemFunctionCallElaborator
Nested classes/interfaces inherited from class net.sf.saxon.expr.FunctionCall
FunctionCall.FunctionCallElaborator
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Field Summary
Fields inherited from class net.sf.saxon.expr.Expression
EFFECTIVE_BOOLEAN_VALUE, EVALUATE_METHOD, ITEM_FEED_METHOD, ITERATE_METHOD, MAX_COST, MAX_SEQUENCE_LENGTH, MAX_STRING_LENGTH, PROCESS_METHOD, staticProperties, UNBOUNDED_LOWER, UNBOUNDED_UPPER, UPDATE_METHOD, WATCH_METHOD
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionoptimize
(ExpressionVisitor visitor, ContextItemStaticInfo contextInfo) Perform optimisation of an expression and its subexpressions.Methods inherited from class net.sf.saxon.expr.SystemFunctionCall
addToPathMap, call, computeCardinality, computeSpecialProperties, copy, export, getElaborator, getExpressionName, getIntegerBounds, getIntrinsicDependencies, getItemType, getNetCost, getScopingExpression, getTargetFunction, isLiftable, isNegatable, isUpdatingExpression, isVacuousExpression, negate, preEvaluate, process, setRetainedStaticContext, toPattern, typeCheck, unordered
Methods inherited from class net.sf.saxon.expr.StaticFunctionCall
getFunctionName, getStaticUType, getTargetFunction, isCallOn
Methods inherited from class net.sf.saxon.expr.FunctionCall
addExternalFunctionCallToPathMap, adjustRequiredType, checkArgumentCount, checkArguments, checkFunctionCall, computeHashCode, equals, evaluateItem, getArg, getArguments, getArity, getDisplayName, getImplementationMethod, getOperanda, iterate, operands, plural, preEvaluateIfConstant, setArg, setArguments, setOperanda, setOperanda, simplifyArguments, toShortString, toString
Methods inherited from class net.sf.saxon.expr.Expression
adoptChildExpression, allowExtractingCommonSubexpressions, checkedOperands, checkForUpdatingSubexpressions, checkPermittedContents, computeDependencies, computeStaticProperties, dispatchTailCall, dynamicError, effectiveBooleanValue, evaluateAsString, explain, getCardinality, getConfiguration, getCost, getDependencies, getEvaluationMethod, getExtraProperty, getLocalRetainedStaticContext, getLocation, getObjectName, getPackageData, getParentExpression, getProperties, getProperty, getRetainedStaticContext, getSlotsUsed, getSpecialProperties, getStaticBaseURI, getStaticBaseURIString, getStaticType, getStreamerName, getTracingTag, hasCompatibleStaticContext, hashCode, hasSpecialProperty, hasVariableBinding, identityHashCode, implementsStaticTypeCheck, isEqual, isIdentical, isInstruction, isMultiThreaded, isStaticPropertiesKnown, isSubtreeExpression, makeElaborator, markTailFunctionCalls, operandList, operandSparseList, optimizeChildren, prepareForStreaming, resetLocalStaticProperties, restoreParentPointers, setEvaluationMethod, setExtraProperty, setFiltered, setFlattened, setLocation, setParentExpression, setRetainedStaticContextLocally, setRetainedStaticContextThoroughly, setStaticProperty, simplify, simplifyChildren, staticTypeCheck, supportsLazyEvaluation, suppressValidation, typeCheckChildren, typeError, verifyParentPointers, withLocation
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
Methods inherited from interface net.sf.saxon.trace.Traceable
gatherProperties
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Constructor Details
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Optimized
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Method Details
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optimize
public Expression optimize(ExpressionVisitor visitor, ContextItemStaticInfo contextInfo) throws XPathException Description copied from class:FunctionCall
Perform optimisation of an expression and its subexpressions.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.
- Overrides:
optimize
in classSystemFunctionCall
- Parameters:
visitor
- an expression visitorcontextInfo
- 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 toType.ITEM_TYPE
- Returns:
- the original expression, rewritten if appropriate to optimize execution
- Throws:
XPathException
- if an error is discovered during this phase (typically a type error)
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