org.basex.query.item
Class SeqType

java.lang.Object
  org.basex.query.item.SeqType

public final class SeqType
extends Object

Stores a sequence type definition.

Author:

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

Field Summary

QNm	ext Extended type info.
int	occ Occurrence mode: 0 = default, 1 = "?"
Type	type Sequence type.

Constructor Summary

SeqType(QNm name, int o, boolean e)
Constructor.

Method Summary

Item	cast(Item it, Expr expr, QueryContext ctx) Casts the specified item.
Item	cast(Item item, QueryContext ctx) Casts the specified item.
boolean	instance(Iter iter) Checks the instance of the specified iterator.
Return	returned() Indicates the return type of an expression.
String	toString()

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

ext

public QNm ext

Extended type info.

type

public Type type

Sequence type.

occ

public int occ

Occurrence mode: 0 = default, 1 = "?", 2 = "+", 3 = "*".

Constructor Detail

SeqType

public SeqType(QNm name,
               int o,
               boolean e)

Constructor.

Parameters:

name - sequence type

o - occurrences

e - extended info

Method Detail

instance

public boolean instance(Iter iter)
                 throws QueryException

Checks the instance of the specified iterator.

Parameters:

iter - iteration to be checked

Returns:

result of check

Throws:

QueryException - query exception

cast

public Item cast(Item it,
                 Expr expr,
                 QueryContext ctx)
          throws QueryException

Casts the specified item.

Parameters:

it - item

expr - expression reference

ctx - query context

Returns:

resulting item

Throws:

QueryException - query exception

cast

public Item cast(Item item,
                 QueryContext ctx)
          throws QueryException

Casts the specified item.

Parameters:

item - item to be cast

ctx - query context

Returns:

resulting item

Throws:

QueryException - query exception

returned

public Return returned()

Indicates the return type of an expression. Called by the compiler to check if expressions can be reformulated. null is returned by default.

Returns:

result of check

toString

public String toString()

Overrides:

toString in class Object