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java.lang.Objectnet.sf.saxon.expr.Expression
net.sf.saxon.expr.FunctionCall
net.sf.saxon.functions.SystemFunction
net.sf.saxon.functions.CollatingFunction
net.sf.saxon.functions.Minimax
public class Minimax
This class implements the min() and max() functions
| Field Summary | |
|---|---|
static int |
MAX
|
static int |
MIN
|
| Fields inherited from class net.sf.saxon.functions.CollatingFunction |
|---|
stringCollator |
| Fields inherited from class net.sf.saxon.functions.SystemFunction |
|---|
operation |
| Fields inherited from class net.sf.saxon.expr.FunctionCall |
|---|
argument |
| Fields inherited from class net.sf.saxon.expr.Expression |
|---|
EFFECTIVE_BOOLEAN_VALUE, EVALUATE_METHOD, EVENT_FEED_METHOD, ITEM_FEED_METHOD, ITERATE_METHOD, locationId, MAX_SEQUENCE_LENGTH, MAX_STRING_LENGTH, PROCESS_METHOD, PUSH_SELECTION, staticProperties, UNBOUNDED_LOWER, UNBOUNDED_UPPER, WATCH_METHOD |
| Constructor Summary | |
|---|---|
Minimax()
|
|
| Method Summary | |
|---|---|
void |
checkArguments(ExpressionVisitor visitor)
Static analysis: prevent sorting of the argument |
int |
computeCardinality()
Determine the cardinality of the function. |
Expression |
copy()
Copy an expression. |
boolean |
equals(Object o)
Determine whether two expressions are equivalent |
Item |
evaluateItem(XPathContext context)
Evaluate the function |
BuiltInAtomicType |
getArgumentType()
|
AtomicComparer |
getAtomicComparer(XPathContext context)
|
AtomicComparer |
getComparer()
|
int |
getImplementationMethod()
Get implementation method |
ItemType |
getItemType(TypeHierarchy th)
Determine the item type of the value returned by the function |
boolean |
isIgnoreNaN()
Test whether NaN values are to be ignored |
static AtomicValue |
minimax(SequenceIterator iter,
int operation,
AtomicComparer atomicComparer,
boolean ignoreNaN,
XPathContext context)
Static method to evaluate the minimum or maximum of a sequence |
Expression |
optimize(ExpressionVisitor visitor,
ExpressionVisitor.ContextItemType contextItemType)
Perform optimisation of an expression and its subexpressions. |
void |
setIgnoreNaN(boolean ignore)
Indicate whether NaN values should be ignored. |
Expression |
typeCheck(ExpressionVisitor visitor,
ExpressionVisitor.ContextItemType contextItemType)
Type-check the expression |
| Methods inherited from class net.sf.saxon.functions.CollatingFunction |
|---|
expandCollationURI, getAbsoluteCollationURI, getAtomicComparer, getCollator, getExpressionBaseURI, getStringCollator |
| Methods inherited from class net.sf.saxon.functions.SystemFunction |
|---|
addContextDocumentArgument, addDocToPathMap, computeSpecialProperties, getDetails, getErrorCodeForTypeErrors, getOperation, getRequiredType, makeSystemFunction, setDetails, useContextItemAsDefault |
| Methods inherited from class net.sf.saxon.expr.FunctionCall |
|---|
addExternalFunctionCallToPathMap, checkArgumentCount, explain, getArguments, getDisplayName, getExpressionName, getFunctionName, getNumberOfArguments, hashCode, iterateSubExpressions, preEvaluate, promote, replaceSubExpression, setArguments, setFunctionName, simplify, simplifyArguments, toString |
| Methods inherited from class java.lang.Object |
|---|
clone, finalize, getClass, notify, notifyAll, wait, wait, wait |
| Field Detail |
|---|
public static final int MIN
public static final int MAX
| Constructor Detail |
|---|
public Minimax()
| Method Detail |
|---|
public void setIgnoreNaN(boolean ignore)
ignore - true if NaN values are to be ignored when computing the min or max.public boolean isIgnoreNaN()
public AtomicComparer getComparer()
public BuiltInAtomicType getArgumentType()
public int getImplementationMethod()
getImplementationMethod in class SystemFunction
public void checkArguments(ExpressionVisitor visitor)
throws XPathException
checkArguments in class CollatingFunctionvisitor - the expression visitor
XPathException - if the arguments are incorrectpublic int computeCardinality()
computeCardinality in class SystemFunctionStaticProperty.ALLOWS_ZERO_OR_ONE,
StaticProperty.EXACTLY_ONE, StaticProperty.ALLOWS_ONE_OR_MORE,
StaticProperty.ALLOWS_ZERO_OR_MORE
public Expression typeCheck(ExpressionVisitor visitor,
ExpressionVisitor.ContextItemType contextItemType)
throws XPathException
typeCheck in class FunctionCallvisitor - 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
XPathException - if an error is discovered during this phase
(typically a type error)
public Expression optimize(ExpressionVisitor visitor,
ExpressionVisitor.ContextItemType contextItemType)
throws XPathException
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 class SystemFunctionvisitor - 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
XPathException - if an error is discovered during this phase
(typically a type error)public ItemType getItemType(TypeHierarchy th)
getItemType in class SystemFunctionth - the type hierarchy cache
public Expression copy()
copy in class CollatingFunctionpublic boolean equals(Object o)
equals in class CollatingFunction
public Item evaluateItem(XPathContext context)
throws XPathException
evaluateItem in class Expressioncontext - The context in which the expression is to be evaluated
XPathException - if any dynamic error occurs evaluating the
expression
public AtomicComparer getAtomicComparer(XPathContext context)
throws XPathException
XPathException
public static AtomicValue minimax(SequenceIterator iter,
int operation,
AtomicComparer atomicComparer,
boolean ignoreNaN,
XPathContext context)
throws XPathException
iter - Iterator over the input sequenceoperation - either MIN or MAXatomicComparer - an AtomicComparer used to compare valuesignoreNaN - true if NaN values are to be ignoredcontext - dynamic evaluation context
XPathException - typically if non-comparable values are found in the sequence
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