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:
- Container, Expression, InstructionInfoProvider, java.io.Serializable, javax.xml.transform.SourceLocator
- 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.BinaryExpression |
computeSpecialProperties, display, displayOperator, equals, getOperands, getOperator, hashCode, isCommutative, isInverse, iterateSubExpressions, promote, simplify |
Methods inherited from class net.sf.saxon.expr.ComputedExpression |
adoptChildExpression, checkPermittedContents, computeDependencies, computeStaticProperties, dynamicError, dynamicError, evaluateAsString, getCardinality, getColumnNumber, getConstructType, getDependencies, getExecutable, getImplementationMethod, getInstructionInfo, getIntrinsicDependencies, getLineNumber, getLocationId, getParentExpression, getPublicId, getSpecialProperties, getSystemId, iterate, markTailFunctionCalls, process, resetStaticProperties, setLocationId, setParentExpression, typeError, typeError |
Methods inherited from class java.lang.Object |
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait |
MinimaxComparison
public MinimaxComparison(Expression p0,
int operator,
Expression p1)
computeCardinality
public int computeCardinality()
- Determine the static cardinality. Returns [1..1]
- Overrides:
computeCardinality
in class BinaryExpression
analyze
public Expression analyze(StaticContext env,
ItemType contextItemType)
throws XPathException
- Type-check the expression.
- Specified by:
analyze
in interface Expression
- Overrides:
analyze
in class BinaryExpression
- Throws:
XPathException
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