net.sf.saxon.expr

Class Operand

java.lang.Object

net.sf.saxon.expr.Operand

public class Operand
extends Object

Information about a sub-expression and its relationship to the parent expression

Field Summary

Fields

Modifier and Type	Field and Description
Expression	expression

Constructor Summary

Constructors

Constructor and Description
Operand(Expression expression, OperandRole role) Create an operand object

Method Summary

Methods

Modifier and Type	Method and Description
Expression	getExpression() Get the expression used as the actual operand
SequenceType	getRequiredType() Get the required type of the operand
OperandUsage	getUsage() Get the usage of the operand
boolean	hasSameFocus() Ask whether the child expression is evaluated with the same focus as its parent expression
boolean	isEvaluatedRepeatedly() Ask whether the operand is a higher-order operand, in the sense that the child expression is evaluated repeatedly during a single evaluation of the parent expression
boolean	isInChoiceGroup() Ask whether the operand is a member of a choice group
boolean	setsNewFocus() Ask whether the child expression sets a new focus for evaluation of other operands

Methods inherited from class java.lang.Object

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

Field Detail

expression

public Expression expression

Constructor Detail

Operand

public Operand(Expression expression,
       OperandRole role)

Create an operand object

Parameters:

expression - the actual expression used as the operand

role - information about the role this operand plays within the parent expression

Method Detail

getExpression

public Expression getExpression()

Get the expression used as the actual operand

Returns:

the child expression

setsNewFocus

public boolean setsNewFocus()

Ask whether the child expression sets a new focus for evaluation of other operands

Returns:

true if the child expression is evaluated with the same focus as its parent expression

hasSameFocus

public boolean hasSameFocus()

Ask whether the child expression is evaluated with the same focus as its parent expression

Returns:

true if the child expression is evaluated with the same focus as its parent expression

isEvaluatedRepeatedly

public boolean isEvaluatedRepeatedly()

Ask whether the operand is a higher-order operand, in the sense that the child expression is evaluated repeatedly during a single evaluation of the parent expression

Returns:

true if the operand is higher-order

getUsage

public OperandUsage getUsage()

Get the usage of the operand

Returns:

the usage

getRequiredType

public SequenceType getRequiredType()

Get the required type of the operand

Returns:

the required type

isInChoiceGroup

public boolean isInChoiceGroup()

Ask whether the operand is a member of a choice group

Returns:

true if the operand is in a choice group