## com.saxonica.expr.ee
Class GeneralComparisonEE

    java.lang.Object
      net.sf.saxon.expr.Expression
          net.sf.saxon.expr.BinaryExpression
              net.sf.saxon.expr.GeneralComparison
                  com.saxonica.expr.ee.GeneralComparisonEE

All Implemented Interfaces:
  Serializable, SourceLocator, LocationProvider, SaxonLocator, ComparisonExpression, EvaluableItem, SequenceIterable, InstructionInfo, Locator

    public class GeneralComparisonEE

extends GeneralComparison

This class provides an implementation of the GeneralComparison "=" operator, which deals efficiently with comparing two sequences.

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

Method Summary
`Expression` `copy()` Copy an expression.
`boolean` `effectiveBooleanValue(XPathContext context)` Evaluate the expression in a boolean context
`protected void` `explainExtraAttributes(ExpressionPresenter out)` Add subclass-specific attributes to the expression tree explanation.
`protected GeneralComparison` `getInverseComparison()`
`Expression` `optimize(ExpressionVisitor visitor, ItemType contextItemType)` Optimize the expression

Methods inherited from class net.sf.saxon.expr.GeneralComparison
`compare, computeCardinality, convertsUntypedToOther, evaluateItem, getAtomicComparer, getExpressionName, getItemType, getSingletonOperator, setAtomicComparer, simplify, 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

### GeneralComparisonEE

    public GeneralComparisonEE(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

### optimize

    public Expression optimize(ExpressionVisitor visitor,
                               ItemType contextItemType)
                        throws XPathException

  Description copied from class: `GeneralComparison`
  Optimize the expression

  Overrides:
    `optimize` in class `GeneralComparison`
  Parameters:
    `visitor` - an expression visitor
    `contextItemType` - 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`
  Returns:
    the checked expression
  Throws:
    `XPathException` - if an error is discovered during this phase (typically a type error)

### copy

    public Expression copy()

  Description copied from class: `GeneralComparison`
  Copy an expression. This makes a deep copy.

  Overrides:
    `copy` in class `GeneralComparison`
  Returns:
    the copy of the original expression

### effectiveBooleanValue

    public boolean effectiveBooleanValue(XPathContext context)
                                  throws XPathException

  Evaluate the expression in a boolean context

  Overrides:
    `effectiveBooleanValue` in class `GeneralComparison`
  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

### getInverseComparison

    protected GeneralComparison getInverseComparison()

  Overrides:
    `getInverseComparison` in class `GeneralComparison`

### explainExtraAttributes

    protected void explainExtraAttributes(ExpressionPresenter out)

  Description copied from class: `BinaryExpression`
  Add subclass-specific attributes to the expression tree explanation. Default implementation does nothing; this is provided for subclasses to override.

  Overrides:
    `explainExtraAttributes` in class `GeneralComparison`
  Parameters:
    `out` - the output destination for the displayed expression tree

Copyright (c) 2004-2010 Saxonica Limited. All rights reserved.