net.sf.saxon.expr
Class BooleanExpression
- EvaluableItem, InstructionInfoProvider, Negatable, SequenceIterable, Serializable, SourceLocator
public class BooleanExpression
Boolean expression: two truth values combined using AND or OR.
computeCardinality , computeSpecialProperties , displayOperator , equals , explain , getOperands , getOperator , hashCode , isAssociative , isCommutative , isInverse , iterateSubExpressions , optimize , promote , replaceSubExpression , setFlattened , simplify , toString , typeCheck |
addToPathMap , adoptChildExpression , checkPermittedContents , computeCardinality , computeDependencies , computeSpecialProperties , computeStaticProperties , copy , display , doPromotion , dynamicError , effectiveBooleanValue , evaluateAsString , evaluateItem , explain , explain , findParentOf , getCardinality , getColumnNumber , getConstructType , getContainer , getDependencies , getExecutable , getHostLanguage , getImplementationMethod , getInstructionInfo , getIntrinsicDependencies , getItemType , getLineNumber , getLocationId , getLocationProvider , getPublicId , getSlotsUsed , getSpecialProperties , getSystemId , hasLoopingSubexpression , implementsStaticTypeCheck , iterate , iterateEvents , iterateSubExpressions , markTailFunctionCalls , optimize , process , promote , replaceSubExpression , resetLocalStaticProperties , setContainer , setFiltered , setFlattened , setLocationId , simplify , staticTypeCheck , suppressValidation , toString , typeCheck , typeError |
BooleanExpression
public BooleanExpression(Expression p1,
int operator,
Expression p2)
Construct a boolean expression
copy
public Expression copy()
Copy an expression. This makes a deep copy.
- copy in interface Expression
- the copy of the original expression
listAndComponents
public static void listAndComponents(Expression exp,
List list)
Construct a list containing the "anded" subexpressions of an expression:
if the expression is (A and B and C), this returns (A, B, C).
exp
- the expression to be decomposedlist
- the list to which the subexpressions are to be added.
negate
public Expression negate()
Return the negation of this boolean expression, that is, an expression that returns true
when this expression returns false, and vice versa
- negate in interface Negatable
- the negation of this expression
optimize
public Expression optimize(ExpressionVisitor visitor,
ItemType contextItemType)
throws XPathException
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.
- optimize in interface BinaryExpression
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
- the original expression, rewritten if appropriate to optimize execution
XPathException
- if an error is discovered during this phase
(typically a type error)