net.sf.saxon.expr
public final class SingletonAtomizer extends UnaryExpression
Constructor Summary | |
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SingletonAtomizer(Expression sequence, RoleLocator role, boolean allowEmpty)
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 |
protected String | displayOperator(NamePool pool)
Give a string representation of the operator for use in diagnostics |
Item | evaluateItem(XPathContext context)
Evaluate as an Item. |
ItemType | getItemType(TypeHierarchy th)
Determine the data type of the items returned by the expression, if possible |
Expression | simplify(StaticContext env)
Simplify an expression |
Expression | typeCheck(StaticContext env, ItemType contextItemType)
Type-check the expression |
Parameters: sequence the sequence to be atomized allowEmpty true if the result sequence is allowed to be empty.
Returns: NON_CREATIVE.
Returns: the operator, as a string
Parameters: th
Returns: a value such as Type.STRING, Type.BOOLEAN, Type.NUMBER. For this class, the result is always an atomic type, but it might be more specific.