net.sf.saxon.functions
Class Minimax
- EvaluableItem, InstructionInfoProvider, SequenceIterable, Serializable, SourceLocator
This class implements the min() and max() functions
addContextDocumentArgument , addDocToPathMap , checkArguments , computeCardinality , computeSpecialProperties , copy , getDetails , getErrorCodeForTypeErrors , getItemType , getRequiredType , makeSystemFunction , optimize , setDetails , useContextItemAsDefault |
addExternalFunctionCallToPathMap , checkArgumentCount , checkArguments , equals , explain , getArguments , getDisplayName , getFunctionName , getNumberOfArguments , hashCode , iterateSubExpressions , optimize , preEvaluate , promote , replaceSubExpression , setArguments , setFunctionName , simplify , simplifyArguments , toString , typeCheck |
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 |
MAX
public static final int MAX
MIN
public static final int MIN
getItemType
public ItemType getItemType(TypeHierarchy th)
Determine the item type of the value returned by the function
- getItemType in interface SystemFunction
th
- the type hierarchy cache
- the statically inferred type of the expression
isIgnoreNaN
public boolean isIgnoreNaN()
Test whether NaN values are to be ignored
- true if NaN values are to be ignored. This is the case for internally-generated min() and max()
functions used to support general comparisons
minimax
public static AtomicValue minimax(SequenceIterator iter,
int operation,
AtomicComparer atomicComparer,
boolean ignoreNaN,
XPathContext context)
throws XPathException
Static method to evaluate the minimum or maximum of a sequence
iter
- Iterator over the input sequenceoperation
- either MIN
or MAX
atomicComparer
- an AtomicComparer used to compare valuesignoreNaN
- true if NaN values are to be ignoredcontext
- dynamic evaluation context
- the min or max value in the sequence, according to the rules of the fn:min() or fn:max() functions
XPathException
- typically if non-comparable values are found in the sequence
optimize
public Expression optimize(ExpressionVisitor visitor,
ItemType contextItemType)
throws XPathException
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.
- optimize in interface SystemFunction
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)
setIgnoreNaN
public void setIgnoreNaN(boolean ignore)
Indicate whether NaN values should be ignored. For the external min() and max() function, a
NaN value in the input causes the result to be NaN. Internally, however, min() and max() are also
used in such a way that NaN values should be ignored.
ignore
- true if NaN values are to be ignored when computing the min or max.