public class VennExpression extends BinaryExpression
operator
EFFECTIVE_BOOLEAN_VALUE, EVALUATE_METHOD, ITEM_FEED_METHOD, ITERATE_METHOD, MAX_SEQUENCE_LENGTH, MAX_STRING_LENGTH, PROCESS_METHOD, staticProperties, UNBOUNDED_LOWER, UNBOUNDED_UPPER, UPDATE_METHOD, WATCH_METHOD
Constructor and Description |
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VennExpression(Expression p1,
int op,
Expression p2)
Constructor
|
Modifier and Type | Method and Description |
---|---|
int |
computeCardinality()
Determine the static cardinality of the expression
|
int |
computeHashCode()
Get a hashCode for comparing two expressions.
|
int |
computeSpecialProperties()
Get the static properties of this expression (other than its type).
|
Expression |
copy(RebindingMap rebindings)
Copy an expression.
|
boolean |
effectiveBooleanValue(XPathContext context)
Get the effective boolean value.
|
boolean |
equals(java.lang.Object other)
Is this expression the same as another expression?
|
void |
gatherComponents(int operator,
java.util.Set<Expression> set)
Gather the component operands of a union or intersect expression
|
java.lang.String |
getExpressionName()
Get a name identifying the kind of expression, in terms meaningful to a user.
|
int |
getImplementationMethod()
An implementation of Expression must provide at least one of the methods evaluateItem(), iterate(), or process().
|
ItemType |
getItemType()
Determine the data type of the items returned by this expression
|
protected OperandRole |
getOperandRole(int arg)
Get the operand role (applies to both operands)
|
UType |
getStaticUType(UType contextItemType)
Get the static type of the expression as a UType, following precisely the type
inference rules defined in the XSLT 3.0 specification.
|
java.lang.String |
getStreamerName()
Get the (partial) name of a class that supports streaming of this kind of expression
|
SequenceIterator |
iterate(XPathContext c)
Iterate over the value of the expression.
|
Expression |
optimize(ExpressionVisitor visitor,
ContextItemStaticInfo contextItemType)
Perform optimisation of an expression and its subexpressions.
|
Expression |
simplify()
Simplify an expression.
|
protected java.lang.String |
tag()
Get the element name used to identify this expression in exported expression format
|
Pattern |
toPattern(Configuration config,
boolean is30)
Convert this expression to an equivalent XSLT pattern
|
Expression |
typeCheck(ExpressionVisitor visitor,
ContextItemStaticInfo contextInfo)
Type-check the expression
|
Expression |
unordered(boolean retainAllNodes,
boolean forStreaming)
Replace this expression by an expression that returns the same result but without
regard to order
|
displayOperator, explainExtraAttributes, export, getLhs, getLhsExpression, getOperator, getRhs, getRhsExpression, isAssociative, isCommutative, isInverse, operands, setFlattened, setLhsExpression, setRhsExpression, toShortString, toString
addToPathMap, adoptChildExpression, allowExtractingCommonSubexpressions, checkedOperands, checkForUpdatingSubexpressions, checkPermittedContents, computeDependencies, computeStaticProperties, dynamicError, evaluateAsString, evaluateItem, evaluatePendingUpdates, explain, getCardinality, getConfiguration, getConstructType, getCost, getDependencies, getEvaluationMethod, getExtraProperty, getIntegerBounds, getInterpretedExpression, getIntrinsicDependencies, getLocalRetainedStaticContext, getLocation, getNetCost, getObjectName, getPackageData, getParentExpression, getProperties, getProperty, getRetainedStaticContext, getScopingExpression, getSlotsUsed, getSpecialProperties, getStaticBaseURI, getStaticBaseURIString, getStaticType, hasCompatibleStaticContext, hashCode, hasVariableBinding, identityHashCode, implementsStaticTypeCheck, isCallOn, isCallOnSystemFunction, isIdentical, isInstruction, isLiftable, isMultiThreaded, isSameExpression, isStaticPropertiesKnown, isSubtreeExpression, isUpdatingExpression, isVacuousExpression, markTailFunctionCalls, operandList, operandSparseList, optimizeChildren, process, resetLocalStaticProperties, restoreParentPointers, setEvaluationMethod, setExtraProperty, setFiltered, setLocation, setParentExpression, setRetainedStaticContext, setRetainedStaticContextLocally, setRetainedStaticContextThoroughly, setStaticProperty, simplifyChildren, staticTypeCheck, suppressValidation, typeCheckChildren, typeError, verifyParentPointers, verifyParentPointers
public VennExpression(Expression p1, int op, Expression p2)
p1
- the left-hand operandop
- the operator (union, intersection, or difference)p2
- the right-hand operandpublic Expression simplify() throws XPathException
simplify
in class Expression
XPathException
- if an error is discovered during expression
rewritingpublic java.lang.String getExpressionName()
getExpressionName
in class Expression
public final ItemType getItemType()
getItemType
in class Expression
public UType getStaticUType(UType contextItemType)
getStaticUType
in class Expression
contextItemType
- public final int computeCardinality()
computeCardinality
in class BinaryExpression
StaticProperty.ALLOWS_ZERO_OR_ONE
,
StaticProperty.EXACTLY_ONE
, StaticProperty.ALLOWS_ONE_OR_MORE
,
StaticProperty.ALLOWS_ZERO_OR_MORE
public int computeSpecialProperties()
computeSpecialProperties
in class BinaryExpression
StaticProperty.NON_CREATIVE
. This is overridden
for some subclasses.public void gatherComponents(int operator, java.util.Set<Expression> 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 typeCheck(ExpressionVisitor visitor, ContextItemStaticInfo contextInfo) throws XPathException
typeCheck
in class BinaryExpression
visitor
- an expression visitorcontextInfo
- Information available statically about the context item: whether it is (possibly)
absent; its static type; its streaming posture.XPathException
- if an error is discovered during this phase
(typically a type error)public Expression optimize(ExpressionVisitor visitor, ContextItemStaticInfo 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 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 unordered(boolean retainAllNodes, boolean forStreaming) throws XPathException
unordered
in class Expression
retainAllNodes
- true if all nodes in the result must be retained; false
if duplicates can be eliminatedforStreaming
- set to true if optimizing for streamingXPathException
- if the rewrite failspublic Expression copy(RebindingMap rebindings)
copy
in class Expression
rebindings
- public int getImplementationMethod()
getImplementationMethod
in class BinaryExpression
Expression.ITERATE_METHOD
or Expression.EVALUATE_METHOD
or
Expression.PROCESS_METHOD
protected OperandRole getOperandRole(int arg)
getOperandRole
in class BinaryExpression
arg
- public boolean equals(java.lang.Object other)
equals
in class BinaryExpression
public int computeHashCode()
BinaryExpression
computeHashCode
in class BinaryExpression
public Pattern toPattern(Configuration config, boolean is30) throws XPathException
toPattern
in class Expression
config
- the Saxon configurationis30
- true if this is XSLT 3.0XPathException
- if conversion is not possibleprotected java.lang.String tag()
tag
in class BinaryExpression
public SequenceIterator iterate(XPathContext c) throws XPathException
iterate
in class Expression
c
- The context for evaluationXPathException
- if any dynamic error occurs evaluating the
expressionpublic boolean effectiveBooleanValue(XPathContext context) throws XPathException
effectiveBooleanValue
in class Expression
context
- The context in which the expression is to be evaluatedXPathException
- if any dynamic error occurs evaluating the
expressionpublic java.lang.String getStreamerName()
getStreamerName
in class Expression
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