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java.lang.Objectcom.icl.saxon.expr.Expression
com.icl.saxon.expr.BinaryExpression
com.icl.saxon.expr.RelationalExpression
Relational Expression: a boolean expression that compares two expressions for equals, not-equals, greater-than or less-than.
Field Summary | |
protected int |
operator
|
protected Expression |
p1
|
protected Expression |
p2
|
Fields inherited from class com.icl.saxon.expr.Expression |
staticContext |
Constructor Summary | |
RelationalExpression()
Default constructor |
|
RelationalExpression(Expression p1,
int op,
Expression p2)
Create a relational expression identifying the two operands and the operator |
Method Summary | |
void |
display(int level)
Diagnostic print of expression structure |
Value |
evaluate(Context c)
Evaluate the expression in a given context |
boolean |
evaluateAsBoolean(Context c)
Evaluate the expression in a given context |
int |
getDataType()
Determine the data type of the expression |
int |
getDependencies()
Determine which aspects of the context the expression depends on. |
Expression |
reduce(int dependencies,
Context context)
Perform a partial evaluation of the expression, by eliminating specified dependencies on the context. |
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, evaluateAsNodeSet, evaluateAsNumber, evaluateAsString, getStaticContext, indent, isContextDocumentNodeSet, make, outputStringValue, setStaticContext, usesCurrent |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
protected Expression p1
protected Expression p2
protected int operator
Constructor Detail |
public RelationalExpression()
public RelationalExpression(Expression p1, int op, Expression p2)
p1
- the left-hand operandop
- the operator, as a token returned by the Tokenizer (e.g. Tokenizer.LT)p2
- the right-hand operandMethod Detail |
public Expression simplify() throws XPathException
simplify
in class BinaryExpression
XPathException
public Value evaluate(Context c) throws XPathException
evaluate
in class Expression
c
- the given context for evaluation
XPathException
public boolean evaluateAsBoolean(Context c) throws XPathException
evaluateAsBoolean
in class Expression
c
- the given context for evaluation
XPathException
public int getDataType()
getDataType
in class Expression
public Expression reduce(int dependencies, Context context) throws XPathException
reduce
in class Expression
dependencies
- The dependencies to be removedcontext
- The context to be used for the partial evaluation
XPathException
public void setDetails(Expression p1, int op, Expression p2)
p1
- the left-hand operandop
- the operator, as a token returned by the Tokenizer (e.g. Tokenizer.AND)p2
- the right-hand operandpublic int getDependencies()
getDependencies
in class Expression
public void display(int level)
display
in class Expression
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