com.icl.saxon.expr
Class  SingletonComparison
java.lang.Object
  |
  +--com.icl.saxon.expr.Expression
        |
        +--com.icl.saxon.expr.SingletonComparison
- public class SingletonComparison- extends Expression
Singleton Comparison: A Relational Expression that compares a singleton node-set with a string
 or numeric value for equals, not-equals, greater-than or less-than.
 
 
 
| Methods inherited from class com.icl.saxon.expr.Expression | 
| containsReferences, enumerate, evaluateAsNodeSet, evaluateAsNumber, evaluateAsString, getDataType, getStaticContext, isNumeric, isRelative, make, make, setStaticContext, usesCurrent | 
 
| Methods inherited from class java.lang.Object | 
| clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait | 
 
SingletonComparison
public SingletonComparison(SingletonExpression p1,
                           int op,
                           Value p2)
simplify
public Expression simplify()
                    throws org.xml.sax.SAXException
- Simplify an expression- 
- Overrides:
- simplifyin class- Expression
 
- 
- Returns:
- the simplified expression
 
evaluate
public Value evaluate(Context c)
               throws org.xml.sax.SAXException
- Evaluate the expression in a given context- 
- Overrides:
- evaluatein class- Expression
 
- 
- Parameters:
- c- the given context for evaluation
- Returns:
- a BooleanValue representing the result of the comparison of the two operands
 
evaluateAsBoolean
public boolean evaluateAsBoolean(Context c)
                          throws org.xml.sax.SAXException
- Evaluate the expression in a given context- 
- Overrides:
- evaluateAsBooleanin class- Expression
 
- 
- Parameters:
- c- the given context for evaluation
- Returns:
- a boolean representing the result of the numeric comparison of the two operands
 
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- 
- Overrides:
- getDependenciesin class- Expression
 
reduce
public Expression reduce(int dependencies,
                         Context context)
                  throws org.xml.sax.SAXException
- Perform a partial evaluation of the expression, by eliminating specified dependencies
 on the context.- 
- Overrides:
- reducein class- Expression
 
- 
- Parameters:
- dependencies- The dependencies to be removed
- context- The context to be used for the partial evaluation
- Returns:
- a new expression that does not have any of the specified
 dependencies
 
toString
public java.lang.String toString()
- Display the expression as a string- 
- Overrides:
- toStringin class- java.lang.Object