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java.lang.Objectnet.sf.saxon.expr.Expression
net.sf.saxon.expr.UnaryExpression
com.saxonica.functions.hof.FunctionSequenceCoercer
public final class FunctionSequenceCoercer
An FunctionSequenceCoercer performs function coercion on a sequence of function items
| Field Summary |
|---|
| Fields inherited from class net.sf.saxon.expr.UnaryExpression |
|---|
operand |
| 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 | |
|---|---|
FunctionSequenceCoercer(Expression sequence,
FunctionType requiredItemType,
RoleLocator role,
TypeCheckerEnvironment visitor)
Constructor |
|
| Method Summary | |
|---|---|
int |
computeCardinality()
Determine the static cardinality of the expression |
int |
computeSpecialProperties()
Determine the special properties of this expression |
Expression |
copy()
Copy an expression. |
boolean |
equals(Object other)
Is this expression the same as another expression? |
Item |
evaluateItem(XPathContext context)
Evaluate as an Item. |
void |
explain(ExpressionPresenter destination)
Diagnostic print of expression structure. |
ItemType |
getItemType(TypeHierarchy th)
Determine the data type of the items returned by the expression, if possible |
RoleLocator |
getRole()
|
TypeCheckerEnvironment |
getVisitor()
|
int |
hashCode()
get HashCode for comparing two expressions. |
SequenceIterator |
iterate(XPathContext context)
Iterate over the sequence of values |
Expression |
simplify(ExpressionVisitor visitor)
Simplify an expression |
Expression |
typeCheck(ExpressionVisitor visitor,
ExpressionVisitor.ContextItemType contextItemType)
Type-check the expression |
| Methods inherited from class net.sf.saxon.expr.UnaryExpression |
|---|
displayOperator, getBaseExpression, iterateSubExpressions, optimize, promote, replaceSubExpression, toString |
| Methods inherited from class java.lang.Object |
|---|
clone, finalize, getClass, notify, notifyAll, wait, wait, wait |
| Constructor Detail |
|---|
public FunctionSequenceCoercer(Expression sequence,
FunctionType requiredItemType,
RoleLocator role,
TypeCheckerEnvironment visitor)
sequence - this must be a sequence of function item values. This is not checked; a ClassCastException
will occur if the precondition is not satisfied.requiredItemType - the function item type to which all items in the sequence should be converted,
using the rules for function coercion.| Method Detail |
|---|
public Expression simplify(ExpressionVisitor visitor)
throws XPathException
simplify in class UnaryExpressionvisitor - an expression visitor
XPathException - if an error is discovered during expression
rewriting
public Expression typeCheck(ExpressionVisitor visitor,
ExpressionVisitor.ContextItemType contextItemType)
throws XPathException
typeCheck in class UnaryExpressionvisitor - 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 int computeSpecialProperties()
computeSpecialProperties in class UnaryExpressionStaticProperty.NON_CREATIVE.public Expression copy()
copy in class Expression
public SequenceIterator iterate(XPathContext context)
throws XPathException
iterate in class Expressioncontext - supplies the context for evaluation
XPathException - if any dynamic error occurs evaluating the
expression
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
expressionpublic ItemType getItemType(TypeHierarchy th)
getItemType in class UnaryExpressionth - the type hierarchy cache
public int computeCardinality()
computeCardinality in class UnaryExpressionStaticProperty.ALLOWS_ZERO_OR_ONE,
StaticProperty.EXACTLY_ONE, StaticProperty.ALLOWS_ONE_OR_MORE,
StaticProperty.ALLOWS_ZERO_OR_MOREpublic RoleLocator getRole()
public TypeCheckerEnvironment getVisitor()
public boolean equals(Object other)
equals in class UnaryExpressionpublic int hashCode()
UnaryExpression
hashCode in class UnaryExpressionpublic void explain(ExpressionPresenter destination)
explain in class UnaryExpressiondestination - the expression presenter used to display the structure
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