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java.lang.Object | +--net.sf.saxon.expr.ComputedExpression | +--net.sf.saxon.expr.BinaryExpression | +--net.sf.saxon.expr.MinimaxComparison
Class to handle many-to-many A less-than B comparisons by evaluating min(A) < max(B), and similarly for greater-than, etc. This expression is used only where it is known that the comparisons will all be numeric: that is, where at least one of the operands has a static type that is a numeric sequence.
Field Summary | |
protected Expression[] |
operands
|
protected int |
operator
|
Fields inherited from class net.sf.saxon.expr.ComputedExpression |
lineNumber, NO_ARGUMENTS, staticProperties |
Constructor Summary | |
MinimaxComparison(Expression p0,
int operator,
Expression p1)
|
Method Summary | |
Expression |
analyze(StaticContext env)
Type-check the expression. |
int |
computeCardinality()
Determine the static cardinality. |
void |
display(int level,
NamePool pool)
Diagnostic print of expression structure |
protected java.lang.String |
displayOperator()
|
boolean |
effectiveBooleanValue(XPathContext context)
Evaluate the expression in a boolean context |
boolean |
equals(java.lang.Object other)
Is this expression the same as another expression? |
Item |
evaluateItem(XPathContext context)
Evaluate the expression in a given context |
ItemType |
getItemType()
Determine the data type of the expression |
Expression[] |
getSubExpressions()
Get the immediate subexpressions of this expression |
int |
hashCode()
get HashCode for comparing two expressions. |
protected static boolean |
isCommutative(int operator)
|
Expression |
promote(PromotionOffer offer)
Promote this expression if possible |
void |
setDetails(Expression p1,
int op,
Expression p2)
Identify the two operands and the operator (for use when the default constructor was used) |
Expression |
simplify()
Simplify an expression |
Methods inherited from class net.sf.saxon.expr.ComputedExpression |
computeDependencies, computeSpecialProperties, computeStaticProperties, dynamicError, evaluateAsString, getCardinality, getDependencies, getIntrinsicDependencies, getLineNumber, getSourceLocator, getSpecialProperties, iterate, markTailFunctionCalls, setLineNumber, typeError |
Methods inherited from class java.lang.Object |
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
protected Expression[] operands
protected int operator
Constructor Detail |
public MinimaxComparison(Expression p0, int operator, Expression p1)
Method Detail |
public int computeCardinality()
computeCardinality
in class net.sf.saxon.expr.BinaryExpression
public Expression analyze(StaticContext env) throws XPathException
analyze
in interface Expression
analyze
in class net.sf.saxon.expr.BinaryExpression
env
- the static context of the expression
XPathException
public ItemType getItemType()
public Item evaluateItem(XPathContext context) throws XPathException
evaluateItem
in interface Expression
evaluateItem
in class ComputedExpression
context
- the given 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 given context for evaluation
XPathException
- if any dynamic error occurs evaluating the
expressionpublic void setDetails(Expression p1, int op, Expression p2)
p1
- the left-hand operandop
- the operator, as a token returned by the Tokenizer (e.g. Tokenizer.AND)p2
- the right-hand operandpublic Expression simplify() throws XPathException
simplify
in interface Expression
simplify
in class ComputedExpression
XPathException
- if an error is discovered during expression
rewritingpublic 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 Expression[] getSubExpressions()
getSubExpressions
in interface Expression
getSubExpressions
in class ComputedExpression
protected static boolean isCommutative(int operator)
public boolean equals(java.lang.Object other)
equals
in class java.lang.Object
public int hashCode()
hashCode
in class java.lang.Object
public void display(int level, NamePool pool)
level
- indentation level for this expressionprotected java.lang.String displayOperator()
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