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## org.basex.query.ft
Class FTWindow

    java.lang.Object
      org.basex.query.ExprInfo
          org.basex.query.expr.Expr
              org.basex.query.ft.FTExpr
                  org.basex.query.ft.FTWindow

    public final class FTWindow

extends FTExpr

FTWindow 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.ft.FTExpr
`expr`

Constructor Summary
`FTWindow(FTExpr e, Expr w, Tokenizer.FTUnit u)` Constructor.

Method Summary
`FTItem` | `atomic(QueryContext ctx)` This method is called by the sequential full-text evaluation.
`FTExpr` | `comp(QueryContext ctx)` Optimizes and compiles the expression.
`boolean` | `indexAccessible(IndexContext ic)` Checks if an index can be used for query evaluation.
`FTIter` | `iter(QueryContext ctx)` This method is called by the index-based full-text evaluation.
`void` | `plan(Serializer ser)` Recursively sends the abstract syntax of this expression to the specified serializer.
`boolean` | `removable(Var v, QueryContext ctx)` Checks if the specified variable is removable.
`FTExpr` | `remove(Var v)` Removes the specified variable in a sub expression.
`String` | `toString()`

Methods inherited from class org.basex.query.ft.FTExpr
`color, indexEquivalent, returned, uses`

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

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

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

Constructor Detail

### FTWindow

    public FTWindow(FTExpr e,
                    Expr w,
                    Tokenizer.FTUnit u)

  Constructor.

  Parameters:
    `e` - expression
    `w` - window
    `u` - unit

Method Detail

### comp

    public FTExpr comp(QueryContext ctx)
                throws QueryException

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

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

### removable

    public boolean removable(Var v,
                             QueryContext ctx)

  Description copied from class: `Expr`
  Checks if the specified variable is removable.

  Overrides:
    `removable` in class `FTExpr`
  Parameters:
    `v` - variable to be removed
    `ctx` - query context
  Returns:
    result of check

### remove

    public FTExpr remove(Var v)

  Description copied from class: `Expr`
  Removes the specified variable in a sub expression.

  Overrides:
    `remove` in class `FTExpr`
  Parameters:
    `v` - variable to be removed
  Returns:
    expression with removed variable

### plan

    public void plan(Serializer ser)
              throws IOException

  Description copied from class: `ExprInfo`
  Recursively sends the abstract syntax of this expression to the specified serializer.

  Parameters:
    `ser` - serializer
  Throws:
    `IOException` - I/O exception

### toString

    public String toString()

### atomic

    public FTItem atomic(QueryContext ctx)
                  throws QueryException

  Description copied from class: `FTExpr`
  This method is called by the sequential full-text evaluation.

  Specified by:
    `atomic` in class `FTExpr`
  Parameters:
    `ctx` - query context
  Returns:
    resulting item
  Throws:
    `QueryException` - query exception

### iter

    public FTIter iter(QueryContext ctx)
                throws QueryException

  Description copied from class: `FTExpr`
  This method is called by the index-based full-text evaluation.

  Specified by:
    `iter` in class `FTExpr`
  Parameters:
    `ctx` - query context
  Returns:
    resulting item
  Throws:
    `QueryException` - query exception

### indexAccessible

    public boolean indexAccessible(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:
    `ic` - index context
  Returns:
    true if an index can be used
  Throws:
    `QueryException` - query exception

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