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java.lang.Object | +--net.sf.saxon.expr.ComputedExpression | +--net.sf.saxon.expr.BinaryExpression | +--net.sf.saxon.expr.VennExpression
An expression representing a nodeset that is a union, difference, or intersection of two other NodeSets
Field Summary | |
protected Expression |
operand0
|
protected Expression |
operand1
|
protected int |
operator
|
Fields inherited from class net.sf.saxon.expr.ComputedExpression |
locationId, staticProperties |
Fields inherited from interface net.sf.saxon.expr.Expression |
EVALUATE_METHOD, ITERATE_METHOD, PROCESS_METHOD |
Constructor Summary | |
VennExpression(Expression p1,
int op,
Expression p2)
Constructor |
Method Summary | |
Expression |
analyze(StaticContext env,
ItemType contextItemType)
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). |
void |
display(int level,
NamePool pool,
java.io.PrintStream out)
Diagnostic print of expression structure |
protected java.lang.String |
displayOperator()
|
boolean |
effectiveBooleanValue(XPathContext context)
Get the effective boolean value. |
boolean |
equals(java.lang.Object other)
Is this expression the same as another expression? |
ItemType |
getItemType()
Determine the data type of the items returned by this expression |
int |
hashCode()
Is this expression the same as another expression? |
protected static boolean |
isCommutative(int operator)
|
SequenceIterator |
iterate(XPathContext c)
Iterate over the value of the expression. |
java.util.Iterator |
iterateSubExpressions()
Get the immediate subexpressions of this expression |
Expression |
promote(PromotionOffer offer)
Promote this expression if possible |
Expression |
simplify(StaticContext env)
Simplify the expression |
Methods inherited from class java.lang.Object |
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
protected Expression operand0
protected Expression operand1
protected int operator
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 operandMethod Detail |
public final ItemType getItemType()
public final int computeCardinality()
computeCardinality
in class net.sf.saxon.expr.BinaryExpression
public int computeSpecialProperties()
computeSpecialProperties
in class ComputedExpression
public Expression simplify(StaticContext env) throws XPathException
simplify
in interface Expression
simplify
in class net.sf.saxon.expr.BinaryExpression
XPathException
public Expression analyze(StaticContext env, ItemType contextItemType) throws XPathException
analyze
in interface Expression
analyze
in class net.sf.saxon.expr.BinaryExpression
env
- the static context of the expressioncontextItemType
- 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
public int hashCode()
hashCode
in class net.sf.saxon.expr.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
expressionpublic Expression promote(PromotionOffer offer) throws XPathException
promote
in interface Expression
promote
in class ComputedExpression
offer
- details of the offer, for example the offer to move
expressions that don't depend on the context to an outer level in
the containing expression
XPathException
- if any error is detectedpublic java.util.Iterator iterateSubExpressions()
iterateSubExpressions
in interface Expression
iterateSubExpressions
in class ComputedExpression
protected static boolean isCommutative(int operator)
public boolean equals(java.lang.Object other)
equals
in class java.lang.Object
public void display(int level, NamePool pool, java.io.PrintStream out)
level
- indentation level for this expressionpool
- NamePool used to expand any names appearing in the expressionout
- Output destinationprotected java.lang.String displayOperator()
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