lux.xquery

Class InstanceOf

java.lang.Object

lux.xpath.AbstractExpression

lux.xquery.InstanceOf

All Implemented Interfaces:

Visitable

public class InstanceOf
extends AbstractExpression

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
InstanceOf(String typeName, AbstractExpression valueExpr)

Method Summary

Methods

Modifier and Type	Method and Description
AbstractExpression	accept(ExpressionVisitor visitor)
VariableContext	getBindingContext() If this expression depends "directly" on a variable, return that variable's binding context: a for or let clause, or a global variable definition.
int	getPrecedence()
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, getHead, getLastContextStep, getRoot, getSubs, getSuper, getTail, getType, isAbsolute, isDocumentOrdered, isRestrictive, 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

InstanceOf

public InstanceOf(String typeName,
          AbstractExpression valueExpr)

Method Detail

accept

public AbstractExpression accept(ExpressionVisitor visitor)

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

getPrecedence

public int getPrecedence()

Specified by:

getPrecedence in class AbstractExpression

Returns:

a number indicating the *outer* precedence of this expression. Expressions with lower precedence numbers have lower precedence, ie bind more loosely, than expressions with higher precedence. Expressions with no sub-expressions are assigned a high precedence. Complex expressions can be seen as having an inner and an outer precedence; for example function call expressions behave as a comma with regard to their sub-expressions, the arguments, and like parentheses to their enclosing expression.

getBindingContext

public VariableContext getBindingContext()

Description copied from class: AbstractExpression

If this expression depends "directly" on a variable, return that variable's binding context: a for or let clause, or a global variable definition. This recurses through variables, so if there are aliases it retrieves the ultimate context. We need to define directly dependent precisely; what it's used for is to determine with an order by expression is dependent on a for-variable, and ultimately whether an order by optimization can be applied.

Overrides:

getBindingContext in class AbstractExpression

Returns:

the binding context of the base expression