| java.lang.Object
 net.sf.saxon.expr.ComputedExpression
net.sf.saxon.expr.BinaryExpression
net.sf.saxon.expr.BooleanExpression
| BooleanExpression | | public class BooleanExpression extends BinaryExpression (Code) | | Boolean expression: two truth values combined using AND or OR.
|
| computeCardinality | | public int computeCardinality()(Code) | | Determine the static cardinality. Returns [1..1]
|
| listAndComponents | | public static void listAndComponents(Expression exp, List list)(Code) | | Construct a list containing the "anded" subexpressions of an expression:
if the expression is (A and B and C), this returns (A, B, C).
Parameters:
exp - the expression to be decomposed
Parameters:
list - the list to which the subexpressions are to be added. |
| negate | | public Expression negate(StaticContext env)(Code) | | Return the negation of this boolean expression, that is, an expression that returns true
when this expression returns false, and vice versa
|
| optimize | | public Expression optimize(Optimizer opt, StaticContext env, ItemType contextItemType) throws XPathException(Code) | | Perform optimisation of an expression and its subexpressions.
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.
Parameters:
opt - the optimizer in use. This provides access to supporting functions; it also allowsdifferent optimization strategies to be used in different circumstances.
Parameters:
env - the static context of the expression
Parameters:
contextItemType - 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 tonet.sf.saxon.type.Type.ITEM_TYPE the original expression, rewritten if appropriate to optimize execution
throws:
net.sf.saxon.trans.StaticError - if an error is discovered during this phase(typically a type error) |
|
|