org.basex.query.item

Class Seq

java.lang.Object

org.basex.data.ExprInfo

org.basex.query.expr.Expr

org.basex.query.item.Value

org.basex.query.item.Seq

All Implemented Interfaces:

java.lang.Iterable<Item>

Direct Known Subclasses:

DBNodeSeq, IntSeq, ItemSeq, RangeSeq

public abstract class Seq
extends Value

Sequence, containing at least two items.

Author:

BaseX Team 2005-12, BSD 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.item.Value

type

Method Summary

Methods

Modifier and Type	Method and Description
static Value	get(Item[] v, int s) Returns a value representation of the specified items.
int	hash(InputInfo ii) Returns a hash code for this value.
Item	item(QueryContext ctx, InputInfo ii) Evaluates the expression and returns the resulting item or a null reference, if the expression yields an empty sequence.
ValueIter	iter() Returns an iterator.
long	size() Returns the sequence size or 1.
Item	test(QueryContext ctx, InputInfo ii) Performs a predicate test and returns the item if test was successful.
java.lang.String	toString()

Methods inherited from class org.basex.query.item.Value

cache, comp, count, data, description, homogenous, info, isValue, itemAt, iter, iterator, removable, remove, toJava, uses, value, writeTo

Methods inherited from class org.basex.query.expr.Expr

addText, compEbv, ebv, hasFreeVars, indexAccessible, indexEquivalent, isEmpty, isFunction, isItem, isVacuous, iterable, markTailCalls, sameAs, type

Methods inherited from class org.basex.data.ExprInfo

plan

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Method Detail

get

public static Value get(Item[] v,
        int s)

Returns a value representation of the specified items.

Parameters:

v - value

s - size

Returns:

resulting item or sequence

size

public final long size()

Description copied from class: Expr

Returns the sequence size or 1.

Specified by:

size in class Value

Returns:

result of check

item

public final Item item(QueryContext ctx,
        InputInfo ii)
                throws QueryException

Description copied from class: Expr

Evaluates the expression and returns the resulting item or a null reference, if the expression yields an empty sequence. If this method is not overwritten, Expr.iter(org.basex.query.QueryContext) must be implemented by an expression, as it may be called by this method.

Specified by:

item in class Expr

Parameters:

ctx - query context

ii - input info

Returns:

iterator

Throws:

QueryException - query exception

test

public final Item test(QueryContext ctx,
        InputInfo ii)
                throws QueryException

Description copied from class: Expr

Performs a predicate test and returns the item if test was successful.

Specified by:

test in class Expr

Parameters:

ctx - query context

ii - input info

Returns:

item

Throws:

QueryException - query exception

iter

public final ValueIter iter()

Description copied from class: Value

Returns an iterator.

Specified by:

iter in class Value

Returns:

iterator

hash

public final int hash(InputInfo ii)
               throws QueryException

Description copied from class: Value

Returns a hash code for this value.

Specified by:

hash in class Value

Parameters:

ii - input info

Returns:

hash code

Throws:

QueryException - if atomization can't be applied (e.g. function item)

toString

public java.lang.String toString()

Specified by:

toString in class ExprInfo