Overview | Package | Class | Use | Tree | Deprecated | Index | Help
PREV CLASS NEXT CLASS | FRAMES NO FRAMES
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD

## org.basex.query.xpath.expr
Class Equality

    java.lang.Object
      org.basex.query.ExprInfo
          org.basex.query.xpath.expr.Expr
              org.basex.query.xpath.expr.Arr
                  org.basex.query.xpath.expr.Cmp
                      org.basex.query.xpath.expr.Equality

    public final class Equality

extends Cmp

Equality Expression, evaluating comparisons.

Author:
  Workgroup DBIS, University of Konstanz 2005-08, ISC License, Tim Petrowsky

Field Summary

Fields inherited from class org.basex.query.xpath.expr.Cmp
`type`

Fields inherited from class org.basex.query.xpath.expr.Arr
`expr`

Constructor Summary
`Equality(Expr e1, Expr e2, Comp t)` Constructor.

Method Summary
`Expr` | `indexEquivalent(XPContext ctx, Step curr, boolean seq)` Returns an equivalent expression which accesses an index structure.
`int` | `indexSizes(XPContext ctx, Step curr, int min)` Returns the number of results if this query is evaluated by an index.

Methods inherited from class org.basex.query.xpath.expr.Cmp
`comp, eval, plan, standard, toString`

Methods inherited from class org.basex.query.xpath.expr.Arr
`sameAs, usesPos, usesSize`

Methods inherited from class org.basex.query.xpath.expr.Expr
`returnedValue`

Methods inherited from class org.basex.query.ExprInfo
`color, info, name`

Methods inherited from class java.lang.Object
`equals, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Constructor Detail

### Equality

    public Equality(Expr e1,
                    Expr e2,
                    Comp t)

  Constructor.

  Parameters:
    `e1` - first expression
    `e2` - second expression to compare with first
    `t` - `Comp.EQ` or `Comp.NE`

Method Detail

### indexEquivalent

    public Expr indexEquivalent(XPContext ctx,
                                Step curr,
                                boolean seq)

  Description copied from class: `Expr`
  Returns an equivalent expression which accesses an index structure.

  Overrides:
    `indexEquivalent` in class `Expr`
  Parameters:
    `ctx` - root
    `curr` - location step
    `seq` - flag for sequential evaluation
  Returns:
    Equivalent index-expression or null

### indexSizes

    public int indexSizes(XPContext ctx,
                          Step curr,
                          int min)

  Description copied from class: `Expr`
  Returns the number of results if this query is evaluated by an index. If `Integer.MAX_VALUE` is returned, no index access is possible.

  Overrides:
    `indexSizes` in class `Expr`
  Parameters:
    `ctx` - root
    `curr` - the current location step
    `min` - current minimum index hits
  Returns:
    number of expected results

Overview | Package | Class | Use | Tree | Deprecated | Index | Help
PREV CLASS NEXT CLASS | FRAMES NO FRAMES
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD