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.
  • Field Details

  • Constructor Details

  • Method Details

    • simplify

      public Expression simplify() throws XPathException
      Simplify an expression
      Overrides:
      simplify in class Expression
      Returns:
      the simplified expression
      Throws:
      XPathException
    • evaluate

      public Value evaluate(Context c) throws XPathException
      Evaluate the expression in a given context
      Specified by:
      evaluate in class Expression
      Parameters:
      c - the given context for evaluation
      Returns:
      a BooleanValue representing the result of the comparison of the two operands
      Throws:
      XPathException
    • evaluateAsBoolean

      public boolean evaluateAsBoolean(Context c) throws XPathException
      Evaluate the expression in a given context
      Overrides:
      evaluateAsBoolean in class Expression
      Parameters:
      c - the given context for evaluation
      Returns:
      a boolean representing the result of the numeric comparison of the two operands
      Throws:
      XPathException
    • getDataType

      public int getDataType()
      Determine the data type of the expression, if possible
      Specified by:
      getDataType in class Expression
      Returns:
      Value.BOOLEAN
    • 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
    • reduce

      public Expression reduce(int dependencies, Context context) throws XPathException
      Perform a partial evaluation of the expression, by eliminating specified dependencies on the context.
      Specified by:
      reduce in 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
      Throws:
      XPathException
    • display

      public void display(int level)
      Diagnostic print of expression structure
      Specified by:
      display in class Expression