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java.lang.Object net.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 | |
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static int |
MAX
|
static int |
MIN
|
Fields inherited from class net.sf.saxon.functions.CollatingFunction |
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stringCollator |
Fields inherited from class net.sf.saxon.functions.SystemFunction |
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operation |
Fields inherited from class net.sf.saxon.expr.FunctionCall |
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argument |
Fields inherited from class net.sf.saxon.expr.Expression |
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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 | |
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Minimax()
|
Method Summary | |
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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 |
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expandCollationURI, getAbsoluteCollationURI, getAtomicComparer, getCollator, getExpressionBaseURI, getStringCollator |
Methods inherited from class net.sf.saxon.functions.SystemFunction |
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addContextDocumentArgument, addDocToPathMap, computeSpecialProperties, getDetails, getErrorCodeForTypeErrors, getOperation, getRequiredType, makeSystemFunction, setDetails, useContextItemAsDefault |
Methods inherited from class net.sf.saxon.expr.FunctionCall |
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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 |
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clone, finalize, getClass, notify, notifyAll, wait, wait, wait |
Field Detail |
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public static final int MIN
public static final int MAX
Constructor Detail |
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public Minimax()
Method Detail |
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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 CollatingFunction
visitor
- the expression visitor
XPathException
- if the arguments are incorrectpublic int computeCardinality()
computeCardinality
in class SystemFunction
StaticProperty.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 FunctionCall
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
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 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
XPathException
- if an error is discovered during this phase
(typically a type error)public ItemType getItemType(TypeHierarchy th)
getItemType
in class SystemFunction
th
- the type hierarchy cache
public Expression copy()
copy
in class CollatingFunction
public boolean equals(Object o)
equals
in class CollatingFunction
public Item evaluateItem(XPathContext context) throws XPathException
evaluateItem
in class Expression
context
- The context in which the expression is to be evaluated
XPathException
- if any dynamic error occurs evaluating the
expressionpublic 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 MAX
atomicComparer
- 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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