public class VennExpression extends BinaryExpression
operand0, operand1, operator
EVALUATE_METHOD, ITERATE_METHOD, locationId, PROCESS_METHOD, staticProperties
?????? |
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VennExpression(Expression p1,
int op,
Expression p2)
Constructor
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?????? | ????? |
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int |
computeCardinality()
Determine the static cardinality of the expression
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int |
computeSpecialProperties()
Get the static properties of this expression (other than its type).
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Expression |
copy()
Copy an expression.
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boolean |
effectiveBooleanValue(XPathContext context)
Get the effective boolean value.
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boolean |
equals(java.lang.Object other)
Is this expression the same as another expression?
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void |
gatherComponents(int operator,
java.util.Set set)
Gather the component operands of a union or intersect expression
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ItemType |
getItemType(TypeHierarchy th)
Determine the data type of the items returned by this expression
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int |
hashCode()
Get a hashCode for comparing two expressions.
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SequenceIterator |
iterate(XPathContext c)
Iterate over the value of the expression.
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Expression |
optimize(ExpressionVisitor visitor,
ItemType contextItemType)
Perform optimisation of an expression and its subexpressions.
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Expression |
simplify(ExpressionVisitor visitor)
Simplify the expression
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Expression |
typeCheck(ExpressionVisitor visitor,
ItemType contextItemType)
Type-check the expression
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displayOperator, explain, getOperands, getOperator, isAssociative, isCommutative, isInverse, iterateSubExpressions, promote, replaceSubExpression, setFlattened, toString
addToPathMap, adoptChildExpression, checkForUpdatingSubexpressions, checkPermittedContents, computeDependencies, computeStaticProperties, display, doPromotion, dynamicError, evaluateAsString, evaluateItem, evaluatePendingUpdates, explain, findParentOf, getCardinality, getColumnNumber, getColumnNumber, getConstructType, getContainer, getDependencies, getExecutable, getHostLanguage, getImplementationMethod, getIntrinsicDependencies, getLineNumber, getLineNumber, getLocationId, getLocationProvider, getObjectName, getProperties, getProperty, getPublicId, getSlotsUsed, getSpecialProperties, getSystemId, getSystemId, hasLoopingSubexpression, implementsStaticTypeCheck, isUpdatingExpression, iterateEvents, markTailFunctionCalls, process, resetLocalStaticProperties, setContainer, setFiltered, setLocationId, staticTypeCheck, suppressValidation, typeError
public VennExpression(Expression p1, int op, Expression p2)
p1
- the left-hand operandop
- the operator (union, intersection, or difference)p2
- the right-hand operandpublic final ItemType getItemType(TypeHierarchy th)
getItemType
??? Expression
th
- the type hierarchy cachepublic final int computeCardinality()
computeCardinality
??? BinaryExpression
StaticProperty.ALLOWS_ZERO_OR_ONE
,
StaticProperty.EXACTLY_ONE
, StaticProperty.ALLOWS_ONE_OR_MORE
,
StaticProperty.ALLOWS_ZERO_OR_MORE
public int computeSpecialProperties()
computeSpecialProperties
??? BinaryExpression
StaticProperty.NON_CREATIVE
. This is overridden
for some subclasses.public void gatherComponents(int operator, java.util.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
??? BinaryExpression
visitor
- an expression visitorXPathException
- if an error is discovered during expression
rewritingpublic Expression typeCheck(ExpressionVisitor visitor, ItemType contextItemType) throws XPathException
typeCheck
??? 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
XPathException
- if an error is discovered during this phase
(typically a type error)public Expression optimize(ExpressionVisitor visitor, ItemType 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
??? 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
XPathException
- if an error is discovered during this phase
(typically a type error)public Expression copy()
copy
??? Expression
public boolean equals(java.lang.Object other)
equals
??? BinaryExpression
public int hashCode()
BinaryExpression
hashCode
??? BinaryExpression
public SequenceIterator iterate(XPathContext c) throws XPathException
iterate
???? SequenceIterable
iterate
??? Expression
c
- The context for evaluationXPathException
- if any dynamic error occurs evaluating the
expressionpublic boolean effectiveBooleanValue(XPathContext context) throws XPathException
effectiveBooleanValue
??? Expression
context
- The context in which the expression is to be evaluatedXPathException
- if any dynamic error occurs evaluating the
expression