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java.lang.Objectnet.sf.saxon.expr.ComputedExpression
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 |
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Fields inherited from class net.sf.saxon.expr.BinaryExpression |
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operands, operator |
Fields inherited from class net.sf.saxon.expr.ComputedExpression |
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lineNumber, NO_ARGUMENTS, staticProperties |
Constructor Summary | |
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VennExpression(Expression p1,
int op,
Expression p2)
Constructor |
Method Summary | |
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Expression |
analyze(StaticContext env)
Type-check the expression |
int |
computeCardinality()
Determine the static cardinality of the expression |
int |
computeSpecialProperties()
Get the static properties of this expression (other than its type). |
boolean |
effectiveBooleanValue(XPathContext context)
Get the effective boolean value. |
ItemType |
getItemType()
Determine the data type of the items returned by this expression |
int |
hashCode()
Is this expression the same as another expression? |
SequenceIterator |
iterate(XPathContext c)
Iterate over the value of the expression. |
Expression |
simplify()
Simplify the expression |
Methods inherited from class net.sf.saxon.expr.BinaryExpression |
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display, displayOperator, equals, getSubExpressions, isCommutative, promote, setDetails |
Methods inherited from class net.sf.saxon.expr.ComputedExpression |
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computeDependencies, computeStaticProperties, dynamicError, evaluateAsString, evaluateItem, getCardinality, getDependencies, getIntrinsicDependencies, getLineNumber, getSpecialProperties, markTailFunctionCalls, setLineNumber, typeError |
Methods inherited from class java.lang.Object |
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clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public VennExpression(Expression p1, int op, Expression p2)
p1
- the left-hand operandop
- the operator (union, intersection, or difference)p2
- the right-hand operandMethod Detail |
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public final ItemType getItemType()
public final int computeCardinality()
computeCardinality
in class BinaryExpression
public int computeSpecialProperties()
computeSpecialProperties
in class ComputedExpression
public Expression simplify() throws XPathException
simplify
in interface Expression
simplify
in class BinaryExpression
XPathException
- if an error is discovered during expression
rewritingpublic Expression analyze(StaticContext env) throws XPathException
analyze
in interface Expression
analyze
in class BinaryExpression
env
- the static context of the expression
XPathException
- if an error is discovered during this phase
(typically a type error)public int hashCode()
hashCode
in class BinaryExpression
public SequenceIterator iterate(XPathContext c) throws XPathException
iterate
in interface Expression
iterate
in class ComputedExpression
c
- The context for evaluation
XPathException
- if any dynamic error occurs evaluating the
expressionpublic boolean effectiveBooleanValue(XPathContext context) throws XPathException
effectiveBooleanValue
in interface Expression
effectiveBooleanValue
in class ComputedExpression
context
- The context in which the expression is to be evaluated
XPathException
- if any dynamic error occurs evaluating the
expression
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