com.icl.saxon.expr
Class BinaryExpression

java.lang.Object
  com.icl.saxon.expr.Expression
      com.icl.saxon.expr.BinaryExpression

Direct Known Subclasses:

ArithmeticExpression, BooleanExpression, RelationalExpression

abstract class BinaryExpression
extends Expression

Binary Expression: a numeric expression consisting of the two operands and an operator

Field Summary

protected int	operator
protected Expression	p1
protected Expression	p2

Fields inherited from class com.icl.saxon.expr.Expression

staticContext

Constructor Summary

BinaryExpression()
Default constructor

BinaryExpression(Expression p1, int op, Expression p2)
Create a binary expression identifying the two operands and the operator

Method Summary

void	display(int level) Diagnostic print of expression structure
int	getDependencies() Determine which aspects of the context the expression depends on.
void	setDetails(Expression p1, int op, Expression p2) Identify the two operands and the operator (for use when the default constructor was used)
Expression	simplify() Simplify an expression

Methods inherited from class com.icl.saxon.expr.Expression

containsReferences, enumerate, evaluate, evaluateAsBoolean, evaluateAsNodeSet, evaluateAsNumber, evaluateAsString, getDataType, getStaticContext, indent, isContextDocumentNodeSet, make, outputStringValue, reduce, setStaticContext, usesCurrent

Methods inherited from class java.lang.Object

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

Field Detail

p1

protected Expression p1

p2

protected Expression p2

operator

protected int operator

Constructor Detail

BinaryExpression

public BinaryExpression()

Default constructor

BinaryExpression

public BinaryExpression(Expression p1,
                        int op,
                        Expression p2)

Create a binary expression identifying the two operands and the operator

Parameters:

p1 - the left-hand operand

op - the operator, as a token returned by the Tokenizer (e.g. Tokenizer.AND)

p2 - the right-hand operand

Method Detail

setDetails

public void setDetails(Expression p1,
                       int op,
                       Expression p2)

Identify the two operands and the operator (for use when the default constructor was used)

Parameters:

p1 - the left-hand operand

op - the operator, as a token returned by the Tokenizer (e.g. Tokenizer.AND)

p2 - the right-hand operand

simplify

public Expression simplify()
                    throws XPathException

Simplify an expression

Overrides:

simplify in class Expression

Returns:

the simplified expression

Throws:

XPathException

getDependencies

public int getDependencies()

Determine which aspects of the context the expression depends on. The result is a bitwise-or'ed value composed from constants such as Context.VARIABLES and Context.CURRENT_NODE

Specified by:

getDependencies in class Expression

display

public void display(int level)

Diagnostic print of expression structure

Specified by:

display in class Expression