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
```
public abstract static class SystemFunctionCall.Optimized
extends SystemFunctionCall
```
Subclass representing a system function call that has been optimized; this overrides the optimize() method to do nothing, thus ensuring that optimization converges.

Nested Class Summary
- Nested classes/interfaces inherited from class net.sf.saxon.expr.SystemFunctionCall
  SystemFunctionCall.Optimized

Field Summary
- Fields inherited from class net.sf.saxon.expr.SystemFunctionCall
  argumentEvaluators
- 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

Constructor Summary

Constructors
Constructor Description

Optimized(SystemFunction target, Expression[] arguments)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Expression`	`optimize(ExpressionVisitor visitor, ContextItemStaticInfo contextInfo)`	Perform optimisation of an expression and its subexpressions.

Methods inherited from class net.sf.saxon.expr.SystemFunctionCall
addToPathMap, allocateArgumentEvaluators, computeCardinality, computeSpecialProperties, copy, evaluateArguments, export, getExpressionName, getIntegerBounds, getIntrinsicDependencies, getItemType, getNetCost, getScopingExpression, getTargetFunction, isLiftable, isNegatable, isVacuousExpression, negate, preEvaluate, process, resetLocalStaticProperties, setRetainedStaticContext, toPattern, typeCheck, unordered

Methods inherited from class net.sf.saxon.expr.StaticFunctionCall
call, getFunctionName, getStaticUType, getTargetFunction, isCallOn

Methods inherited from class net.sf.saxon.expr.FunctionCall
addExternalFunctionCallToPathMap, adjustRequiredType, checkArgumentCount, checkArguments, checkFunctionCall, computeHashCode, equals, getArg, getArguments, getArity, getDisplayName, getImplementationMethod, getOperanda, iterate, operands, pluralArguments, preEvaluateIfConstant, setArg, setArguments, setOperanda, setOperanda, simplifyArguments, toShortString, toString

Methods inherited from class net.sf.saxon.expr.Expression
adoptChildExpression, allowExtractingCommonSubexpressions, checkedOperands, checkForUpdatingSubexpressions, checkPermittedContents, computeDependencies, computeStaticProperties, dynamicError, effectiveBooleanValue, evaluateAsString, evaluateItem, evaluatePendingUpdates, explain, getCardinality, getConfiguration, getCost, getDependencies, getEvaluationMethod, getExtraProperty, getInterpretedExpression, 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, isUpdatingExpression, markTailFunctionCalls, operandList, operandSparseList, optimizeChildren, prepareForStreaming, restoreParentPointers, setEvaluationMethod, setExtraProperty, setFiltered, setFlattened, setLocation, setParentExpression, setRetainedStaticContextLocally, setRetainedStaticContextThoroughly, setStaticProperty, simplify, simplifyChildren, staticTypeCheck, suppressValidation, typeCheckChildren, typeError, verifyParentPointers

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

- Constructor Detail
  - Optimized
```
public Optimized(SystemFunction target,
                 Expression[] arguments)
```
- Method Detail
  - 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 class SystemFunctionCall
    
    Parameters:
    
    visitor - an expression visitor
    
    contextInfo - 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
    
    Returns:
    
    the original expression, rewritten if appropriate to optimize execution
    
    Throws:
    
    XPathException - if an error is discovered during this phase (typically a type error)