com.icl.saxon.expr
Class BinaryExpression

java.lang.Object
  extended bycom.icl.saxon.expr.Expression
      extended bycom.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