lux.xpath

Class Subsequence

java.lang.Object

lux.xpath.AbstractExpression

lux.xpath.Subsequence

All Implemented Interfaces:

Visitable

public class Subsequence
extends AbstractExpression

represents numeric literal predicates like [1]; last-predicates like [last()] and calls to the subsequence(expr,integer,integer) function.

Nested Class Summary

Nested classes/interfaces inherited from class lux.xpath.AbstractExpression

AbstractExpression.Type

Field Summary

Fields inherited from class lux.xpath.AbstractExpression

subs, sup

Constructor Summary

Constructors

Constructor and Description
Subsequence(AbstractExpression sequence, AbstractExpression start)
Subsequence(AbstractExpression sequence, AbstractExpression start, AbstractExpression length)

Method Summary

Methods

Modifier and Type	Method and Description
AbstractExpression	accept(ExpressionVisitor visitor)
AbstractExpression	getLengthExpr()
int	getPrecedence()
AbstractExpression	getRoot()
AbstractExpression	getSequence()
AbstractExpression	getStartExpr()
boolean	isRestrictive() An expression is restrictive when any empty sub implies the expression is empty.
void	setLengthExpr(AbstractExpression ae)
void	setSequence(AbstractExpression ae)
void	setStartExpr(AbstractExpression ae)
void	toString(StringBuilder buf) Each subclass must implement the toString(StringBuilder) method by appending itself as a syntatically valid XPath/XQuery expression in the given buffer.

Methods inherited from class lux.xpath.AbstractExpression

acceptSubs, appendSub, deepEquals, equivalent, geq, getBindingContext, getHead, getLastContextStep, getSubs, getSuper, getTail, getType, isAbsolute, isDocumentOrdered, matchDown, propEquals, propGreaterEqual, replaceRoot, setSubs, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

Subsequence

public Subsequence(AbstractExpression sequence,
           AbstractExpression start,
           AbstractExpression length)

Subsequence

public Subsequence(AbstractExpression sequence,
           AbstractExpression start)

Method Detail

accept

public AbstractExpression accept(ExpressionVisitor visitor)

getSequence

public AbstractExpression getSequence()

setSequence

public void setSequence(AbstractExpression ae)

getStartExpr

public AbstractExpression getStartExpr()

setStartExpr

public void setStartExpr(AbstractExpression ae)

getLengthExpr

public AbstractExpression getLengthExpr()

setLengthExpr

public void setLengthExpr(AbstractExpression ae)

Parameters:

ae - the expression to use as the length expression

Throws:

ArrayIndexOutOfBoundsException - if there wasn't already a length expression

getRoot

public AbstractExpression getRoot()

Overrides:

getRoot in class AbstractExpression

Returns:

the root of this expression: this will either be a Root(/), a function returning document nodes, or null.

getPrecedence

public int getPrecedence()

Specified by:

getPrecedence in class AbstractExpression

Returns:

the precedence of comma (,) or predicate ([]), depending on the child expressions.

toString

public void toString(StringBuilder buf)

Description copied from class: AbstractExpression

Each subclass must implement the toString(StringBuilder) method by appending itself as a syntatically valid XPath/XQuery expression in the given buffer.

Specified by:

toString in class AbstractExpression

Parameters:

buf - the buffer to append to

isRestrictive

public boolean isRestrictive()

Description copied from class: AbstractExpression

An expression is restrictive when any empty sub implies the expression is empty. In other words, restrictive expressions only return results when all of their subs are non-empty. Eg: and, intersect, predicate, path step.

Overrides:

isRestrictive in class AbstractExpression

Returns:

whether this expression is restrictive