net.sf.saxon.expr
Class GeneralComparison20

java.lang.Object
  net.sf.saxon.expr.Expression
      net.sf.saxon.expr.BinaryExpression
          net.sf.saxon.expr.GeneralComparison
              net.sf.saxon.expr.GeneralComparison20

All Implemented Interfaces:

Serializable, SourceLocator, LocationProvider, SaxonLocator, ComparisonExpression, EvaluableItem, SequenceIterable, InstructionInfo, Locator

public class GeneralComparison20
extends GeneralComparison

The class GeneralComparison20 specializes GeneralComparison for the case where the comparison is done with 2.0 semantics (i.e. with backwards compatibility off). It differs from the superclass in that it will never turn the expression into a GeneralComparison10, which could lead to non-terminating optimizations

See Also:

Serialized Form

Field Summary

Fields inherited from class net.sf.saxon.expr.GeneralComparison

comparer, needsRuntimeCheck, singletonOperator

Fields inherited from class net.sf.saxon.expr.BinaryExpression

operand0, operand1, operator

Fields inherited from class net.sf.saxon.expr.Expression

EVALUATE_METHOD, EVENT_FEED_METHOD, ITEM_FEED_METHOD, ITERATE_METHOD, locationId, PROCESS_METHOD, PUSH_SELECTION, staticProperties, WATCH_METHOD

Constructor Summary

GeneralComparison20(Expression p0, int op, Expression p1)
Create a relational expression identifying the two operands and the operator

Method Summary

Expression	copy() Copy an expression.
protected GeneralComparison	getInverseComparison()
Expression	simplify(ExpressionVisitor visitor) Simplify an expression

Methods inherited from class net.sf.saxon.expr.GeneralComparison

compare, computeCardinality, convertsUntypedToOther, effectiveBooleanValue, evaluateItem, explainExtraAttributes, getAtomicComparer, getExpressionName, getItemType, getSingletonOperator, optimize, setAtomicComparer, typeCheck

Methods inherited from class net.sf.saxon.expr.BinaryExpression

computeSpecialProperties, displayOperator, equals, explain, getOperands, getOperator, hashCode, isAssociative, isCommutative, isInverse, iterateSubExpressions, promote, replaceSubExpression, setFlattened, toString

Methods inherited from class net.sf.saxon.expr.Expression

addToPathMap, adoptChildExpression, checkForUpdatingSubexpressions, checkPermittedContents, computeDependencies, computeStaticProperties, doPromotion, dynamicError, evaluateAsString, evaluatePendingUpdates, explain, getCardinality, getColumnNumber, getColumnNumber, getConstructType, getContainer, getDependencies, getEvaluationMethod, getExecutable, getHostLanguage, getImplementationMethod, getIntrinsicDependencies, getLineNumber, getLineNumber, getLocationId, getLocationProvider, getObjectName, getProperties, getProperty, getPublicId, getSlotsUsed, getSpecialProperties, getSystemId, getSystemId, hasLoopingSubexpression, implementsStaticTypeCheck, isSubtreeExpression, isUpdatingExpression, isVacuousExpression, iterate, iterateEvents, iterateSameFocusSubExpressions, markTailFunctionCalls, process, resetLocalStaticProperties, setContainer, setEvaluationMethod, setFiltered, setLocationId, staticTypeCheck, suppressValidation, typeError

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface net.sf.saxon.expr.ComparisonExpression

getOperands

Constructor Detail

GeneralComparison20

public GeneralComparison20(Expression p0,
                           int op,
                           Expression p1)

Create a relational expression identifying the two operands and the operator

Parameters:

p0 - the left-hand operand

op - the operator, as a token returned by the Tokenizer (e.g. Token.LT)

p1 - the right-hand operand

Method Detail

simplify

public Expression simplify(ExpressionVisitor visitor)
                    throws XPathException

Description copied from class: BinaryExpression

Simplify an expression

Overrides:

simplify in class GeneralComparison

Parameters:

visitor - an expression visitor

Returns:

the simplified expression

Throws:

XPathException - if an error is discovered during expression rewriting

copy

public Expression copy()

Copy an expression. This makes a deep copy.

Overrides:

copy in class GeneralComparison

Returns:

the copy of the original expression

getInverseComparison

protected GeneralComparison getInverseComparison()

Overrides:

getInverseComparison in class GeneralComparison