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## org.basex.query.up
Class Update

    java.lang.Object
      org.basex.query.ExprInfo
          org.basex.query.expr.Expr
              org.basex.query.expr.Arr
                  org.basex.query.up.Update

Direct Known Subclasses:
  Delete, Insert, Rename, Replace

    public abstract class Update

extends Arr

Abstract update expression.

Author:
  Workgroup DBIS, University of Konstanz 2005-10, ISC License, Christian Gruen

Nested Class Summary

Nested classes/interfaces inherited from class org.basex.query.expr.Expr
`Expr.Use`

Field Summary

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

Method Summary
`boolean` | `uses(Expr.Use u, QueryContext ctx)` Indicates if an expression uses the specified type.

Methods inherited from class org.basex.query.expr.Arr
`comp, duplicates, indexEquivalent, plan, removable, remove`

Methods inherited from class org.basex.query.expr.Expr
`addText, atomic, checkCtx, checkDbl, checkItr, e, ebv, i, indexAccessible, iter, returned, sameAs, size, test, v`

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

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

Method Detail

### uses

    public boolean uses(Expr.Use u,
                        QueryContext ctx)

  Description copied from class: `Expr`
  Indicates if an expression uses the specified type. Called by the compiler to perform certain optimizations. `true` is returned by default and thus assumed as "worst-case".

  Overrides:
    `uses` in class `Arr`
  Parameters:
    `u` - use type to be checked
    `ctx` - query context
  Returns:
    result of check

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