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## org.basex.query.expr
Class And

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

    public final class And

extends Arr

And expression.

Author:
  Workgroup DBIS, University of Konstanz 2005-09, ISC License, Christian Gruen

Field Summary

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

Constructor Summary
`And(Expr[] e)` Constructor.

Method Summary
`Bln` | `atomic(QueryContext ctx)` Evaluates the expression and returns the resulting item or a null reference.
`Expr` | `comp(QueryContext ctx)` Optimizes and compiles the expression.
`void` | `indexAccessible(QueryContext ctx, IndexContext ic)` Checks if an index can be used for query evaluation.
`Expr` | `indexEquivalent(QueryContext ctx, IndexContext ic)` Returns an equivalent expression which accesses an index structure.
`Return` | `returned(QueryContext ctx)` Indicates the return type of an expression.
`java.lang.String` | `toString()`

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

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

### And

    public And(Expr[] e)

  Constructor.

  Parameters:
    `e` - 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` - evaluation exception

### atomic

    public Bln atomic(QueryContext ctx)
               throws QueryException

  Description copied from class: `Expr`
  Evaluates the expression and returns the resulting item or a null reference. If this method is not overwritten, `Expr.iter(org.basex.query.QueryContext)` must be implemented.

  Overrides:
    `atomic` in class `Expr`
  Parameters:
    `ctx` - query context
  Returns:
    iterator
  Throws:
    `QueryException` - query exception

### returned

    public Return returned(QueryContext ctx)

  Description copied from class: `Expr`
  Indicates the return type of an expression. Called by the compiler to check if expressions can be reformulated. null is returned by default.

  Overrides:
    `returned` in class `Expr`
  Parameters:
    `ctx` - query context
  Returns:
    result of check

### indexAccessible

    public void indexAccessible(QueryContext ctx,
                                IndexContext ic)
                         throws QueryException

  Description copied from class: `Expr`
  Checks if an index can be used for query evaluation.

  Overrides:
    `indexAccessible` in class `Expr`
  Parameters:
    `ctx` - query context
    `ic` - index context
  Throws:
    `QueryException` - Exception

### indexEquivalent

    public Expr indexEquivalent(QueryContext ctx,
                                IndexContext ic)
                         throws QueryException

  Description copied from class: `Expr`
  Returns an equivalent expression which accesses an index structure. Must be called if `Expr.indexAccessible(org.basex.query.QueryContext, org.basex.query.IndexContext)` is implemented for an expression.

  Overrides:
    `indexEquivalent` in class `Arr`
  Parameters:
    `ctx` - query context
    `ic` - index context
  Returns:
    Equivalent index-expression or null
  Throws:
    `QueryException` - Exception

### toString

    public java.lang.String toString()

  Specified by:
    `toString` in class `ExprInfo`

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