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## org.basex.query.expr
Class List

    java.lang.Object
      org.basex.query.ExprInfo
          org.basex.query.expr.Expr
              org.basex.query.expr.Arr
                  org.basex.query.expr.List

    public final class List

extends Arr

Expression list.

Author:
  Workgroup DBIS, University of Konstanz 2005-09, 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`

Constructor Summary
`List(Expr... l)` Constructor.

Method Summary
`Expr` | `comp(QueryContext ctx)` Optimizes and compiles the expression.
`boolean` | `duplicates(QueryContext ctx)` Returns true if the expression might yield duplicates and unsorted results.
`Iter` | `iter(QueryContext ctx)` Evaluates the expression and returns an iterator on the resulting items.
`long` | `size(QueryContext ctx)` Returns the sequence size or 1.
`java.lang.String` | `toString()`

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

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

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

### List

    public List(Expr... l)

  Constructor.

  Parameters:
    `l` - expression list

Method Detail

### comp

    public Expr comp(QueryContext ctx)
              throws QueryException

  Description copied from class: `Expr`
  Optimizes and compiles the expression.

  Overrides:
    `comp` in class `Arr`
  Parameters:
    `ctx` - query context
  Returns:
    optimized Expression
  Throws:
    `QueryException` - query exception

### iter

    public Iter iter(QueryContext ctx)

  Description copied from class: `Expr`
  Evaluates the expression and returns an iterator on the resulting items. If this method is not overwritten, `Expr.atomic(org.basex.query.QueryContext)` must be implemented.

  Overrides:
    `iter` in class `Expr`
  Parameters:
    `ctx` - query context
  Returns:
    resulting item

### size

    public long size(QueryContext ctx)
              throws QueryException

  Description copied from class: `Expr`
  Returns the sequence size or 1.

  Overrides:
    `size` in class `Expr`
  Parameters:
    `ctx` - query context
  Returns:
    result of check
  Throws:
    `QueryException` - query exception

### duplicates

    public boolean duplicates(QueryContext ctx)

  Description copied from class: `Expr`
  Returns true if the expression might yield duplicates and unsorted results.

  Overrides:
    `duplicates` in class `Arr`
  Parameters:
    `ctx` - query context
  Returns:
    result of check

### toString

    public java.lang.String toString()

  Specified by:
    `toString` in class `ExprInfo`

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