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java.lang.Object net.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 |
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Fields inherited from class net.sf.saxon.expr.UnaryExpression |
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operand |
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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FunctionSequenceCoercer(Expression sequence,
FunctionType requiredItemType,
RoleLocator role,
TypeCheckerEnvironment visitor)
Constructor |
Method Summary | |
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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 |
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displayOperator, getBaseExpression, iterateSubExpressions, optimize, promote, replaceSubExpression, toString |
Methods inherited from class java.lang.Object |
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clone, finalize, getClass, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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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 |
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public Expression simplify(ExpressionVisitor visitor) throws XPathException
simplify
in class UnaryExpression
visitor
- an expression visitor
XPathException
- if an error is discovered during expression
rewritingpublic Expression typeCheck(ExpressionVisitor visitor, ExpressionVisitor.ContextItemType contextItemType) throws XPathException
typeCheck
in class UnaryExpression
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 int computeSpecialProperties()
computeSpecialProperties
in class UnaryExpression
StaticProperty.NON_CREATIVE
.public Expression copy()
copy
in class Expression
public SequenceIterator iterate(XPathContext context) throws XPathException
iterate
in class Expression
context
- supplies the context for evaluation
XPathException
- if any dynamic error occurs evaluating the
expressionpublic 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 ItemType getItemType(TypeHierarchy th)
getItemType
in class UnaryExpression
th
- the type hierarchy cache
public int computeCardinality()
computeCardinality
in class UnaryExpression
StaticProperty.ALLOWS_ZERO_OR_ONE
,
StaticProperty.EXACTLY_ONE
, StaticProperty.ALLOWS_ONE_OR_MORE
,
StaticProperty.ALLOWS_ZERO_OR_MORE
public RoleLocator getRole()
public TypeCheckerEnvironment getVisitor()
public boolean equals(Object other)
equals
in class UnaryExpression
public int hashCode()
UnaryExpression
hashCode
in class UnaryExpression
public void explain(ExpressionPresenter destination)
explain
in class UnaryExpression
destination
- the expression presenter used to display the structure
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