net.sf.saxon.expr.oper

Class OperandArray

java.lang.Object

net.sf.saxon.expr.oper.OperandArray

public class OperandArray
extends Object

Defines an operand set comprising an array of operands numbered zero to N. All operands must be present. Typically (but not exclusively) used for the arguments of a function call. The operands may all have the same operand roles, or have different operand roles.

Constructor Summary

Constructors

Constructor and Description
OperandArray(Expression parent, Expression[] args)
OperandArray(Expression parent, Expression[] args, OperandRole role)
OperandArray(Expression parent, Expression[] args, OperandRole[] roles)

Method Summary

Methods

Modifier and Type	Method and Description
int	getNumberOfOperands() Get the number of operands in the operand array
Operand	getOperand(int n) Get the operand whose identifying number is n.
Expression	getOperandExpression(int n) Get the child expression associated with the operand whose identifying number is n.
OperandRole[]	getRoles() Get the operand roles
Iterable<Expression>	operandExpressions()
Iterable<Operand>	operands() Return a collection containing all the operands.
void	setOperand(int n, Expression child) Set the value of the operand with integer n.

Methods inherited from class java.lang.Object

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

Constructor Detail

OperandArray

public OperandArray(Expression parent,
            Expression[] args)

OperandArray

public OperandArray(Expression parent,
            Expression[] args,
            OperandRole[] roles)

OperandArray

public OperandArray(Expression parent,
            Expression[] args,
            OperandRole role)

Method Detail

getRoles

public OperandRole[] getRoles()

Get the operand roles

Returns:

the roles of the operands as an array, one per operand

getOperand

public Operand getOperand(int n)

Get the operand whose identifying number is n.

Parameters:

n - the identifier of the operand

Returns:

the operand, or null in the case of an optional operand that is absent in the case of this particular expression

Throws:

IllegalArgumentException - if there cannot be an operand at this position

getOperandExpression

public Expression getOperandExpression(int n)

Get the child expression associated with the operand whose identifying number is n.

Parameters:

n - the identifier of the operand

Returns:

the expression associated with the operand, or null in the case of an optional operand that is absent in the case of this particular expression

Throws:

IllegalArgumentException - if there cannot be an operand at this position

operands

public Iterable<Operand> operands()

Return a collection containing all the operands. Generally there is a significance to the order of operands, which usually reflects the order in the raw textual expression.

Returns:

the collection of operands

operandExpressions

public Iterable<Expression> operandExpressions()

setOperand

public void setOperand(int n,
              Expression child)

Set the value of the operand with integer n. The method should implement a fast path for the case where the operand has not actually been changed.

Parameters:

n - identifies the expression to be set/replaced

child - the new subexpression

Throws:

IllegalArgumentException - if the value of n identifies no operand

getNumberOfOperands

public int getNumberOfOperands()

Get the number of operands in the operand array

Returns:

the number of operands