net.sf.saxon.expr
Class MinimaxComparison
java.lang.Object
net.sf.saxon.expr.ComputedExpression
net.sf.saxon.expr.BinaryExpression
net.sf.saxon.expr.MinimaxComparison
- All Implemented Interfaces:
- Serializable, Expression
public class MinimaxComparison
- extends BinaryExpression
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.
- See Also:
- Serialized Form
Methods inherited from class net.sf.saxon.expr.ComputedExpression |
computeDependencies, computeSpecialProperties, computeStaticProperties, dynamicError, evaluateAsString, getCardinality, getDependencies, getIntrinsicDependencies, getLineNumber, getSpecialProperties, iterate, markTailFunctionCalls, setLineNumber, typeError |
MinimaxComparison
public MinimaxComparison(Expression p0,
int operator,
Expression p1)
analyze
public Expression analyze(StaticContext env)
throws XPathException
- Type-check the expression.
- Specified by:
analyze
in interface Expression
- Overrides:
analyze
in class BinaryExpression
- Parameters:
env
- the static context of the expression
- Returns:
- the original expression, rewritten to perform necessary
run-time type checks, and to perform other type-related
optimizations
- Throws:
XPathException
- if an error is discovered during this phase
(typically a type error)
getItemType
public ItemType getItemType()
- Determine the data type of the expression
- Returns:
- Type.BOOLEAN
evaluateItem
public Item evaluateItem(XPathContext context)
throws XPathException
- Evaluate the expression in a given context
- Specified by:
evaluateItem
in interface Expression
- Overrides:
evaluateItem
in class ComputedExpression
- Parameters:
context
- the given context for evaluation
- Returns:
- a BooleanValue representing the result of the numeric comparison of the two operands
- Throws:
XPathException
- if any dynamic error occurs evaluating the
expression
effectiveBooleanValue
public boolean effectiveBooleanValue(XPathContext context)
throws XPathException
- Evaluate the expression in a boolean context
- Specified by:
effectiveBooleanValue
in interface Expression
- Overrides:
effectiveBooleanValue
in class ComputedExpression
- Parameters:
context
- the given context for evaluation
- Returns:
- a boolean representing the result of the numeric comparison of the two operands
- Throws:
XPathException
- if any dynamic error occurs evaluating the
expression