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java.lang.Objectnet.sf.saxon.expr.Expression
net.sf.saxon.expr.BinaryExpression
net.sf.saxon.expr.VennExpression
public class VennExpression
An expression representing a nodeset that is a union, difference, or intersection of two other NodeSets
| Field Summary |
|---|
| Fields inherited from class net.sf.saxon.expr.BinaryExpression |
|---|
operand0, operand1, operator |
| 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 | |
|---|---|
VennExpression(Expression p1,
int op,
Expression p2)
Constructor |
|
| Method Summary | |
|---|---|
int |
computeCardinality()
Determine the static cardinality of the expression |
int |
computeSpecialProperties()
Get the static properties of this expression (other than its type). |
Expression |
copy()
Copy an expression. |
boolean |
effectiveBooleanValue(XPathContext context)
Get the effective boolean value. |
boolean |
equals(Object other)
Is this expression the same as another expression? |
void |
gatherComponents(int operator,
Set set)
Gather the component operands of a union or intersect expression |
String |
getExpressionName()
Get a name identifying the kind of expression, in terms meaningful to a user. |
ItemType |
getItemType(TypeHierarchy th)
Determine the data type of the items returned by this expression |
int |
hashCode()
Get a hashCode for comparing two expressions. |
SequenceIterator |
iterate(XPathContext c)
Iterate over the value of the expression. |
Expression |
optimize(ExpressionVisitor visitor,
ExpressionVisitor.ContextItemType contextItemType)
Perform optimisation of an expression and its subexpressions. |
Expression |
simplify(ExpressionVisitor visitor)
Simplify the expression |
Expression |
typeCheck(ExpressionVisitor visitor,
ExpressionVisitor.ContextItemType contextItemType)
Type-check the expression |
| Methods inherited from class net.sf.saxon.expr.BinaryExpression |
|---|
displayOperator, explain, explainExtraAttributes, getArguments, getOperands, getOperator, isAssociative, isCommutative, isInverse, iterateSubExpressions, promote, replaceSubExpression, setFlattened, toString |
| Methods inherited from class java.lang.Object |
|---|
clone, finalize, getClass, notify, notifyAll, wait, wait, wait |
| Constructor Detail |
|---|
public VennExpression(Expression p1,
int op,
Expression p2)
p1 - the left-hand operandop - the operator (union, intersection, or difference)p2 - the right-hand operand| Method Detail |
|---|
public String getExpressionName()
getExpressionName in class Expressionpublic final ItemType getItemType(TypeHierarchy th)
getItemType in class Expressionth - the type hierarchy cache
public final int computeCardinality()
computeCardinality in class BinaryExpressionStaticProperty.ALLOWS_ZERO_OR_ONE,
StaticProperty.EXACTLY_ONE, StaticProperty.ALLOWS_ONE_OR_MORE,
StaticProperty.ALLOWS_ZERO_OR_MOREpublic int computeSpecialProperties()
computeSpecialProperties in class BinaryExpressionStaticProperty.NON_CREATIVE. This is overridden
for some subclasses.
public void gatherComponents(int operator,
Set set)
operator - union or intersectset - the set into which the components are to be gathered. If the operator
is union, this follows the tree gathering all operands of union expressions. Ditto,
mutatis mutandis, for intersect expressions.
public Expression simplify(ExpressionVisitor visitor)
throws XPathException
simplify in class BinaryExpressionvisitor - 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 BinaryExpressionvisitor - 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 Expression optimize(ExpressionVisitor visitor,
ExpressionVisitor.ContextItemType contextItemType)
throws XPathException
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 class BinaryExpressionvisitor - 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 Expression copy()
copy in class Expressionpublic boolean equals(Object other)
equals in class BinaryExpressionpublic int hashCode()
BinaryExpression
hashCode in class BinaryExpression
public SequenceIterator iterate(XPathContext c)
throws XPathException
iterate in class Expressionc - The context for evaluation
XPathException - if any dynamic error occurs evaluating the
expression
public boolean effectiveBooleanValue(XPathContext context)
throws XPathException
effectiveBooleanValue in class Expressioncontext - The context in which the expression is to be evaluated
XPathException - if any dynamic error occurs evaluating the
expression
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