package com.jclark.xsl.expr;

import com.jclark.xsl.om.*;

public abstract class VariantBase implements Variant {
  public Variant makePermanent() { return this; }
  public NodeIterator convertToNodeSet() throws XSLException {
    throw new XSLException("cannot convert to node-set");
  }
  public double convertToNumber() throws XSLException {
    return Converter.toNumber(convertToString());
  }
  public boolean convertToPredicate(ExprContext context) throws XSLException {
    return convertToBoolean();
  }
  public boolean isBoolean() { return false; }
  public boolean isNumber() { return false; }
  public boolean isString() { return false; }
  public boolean isNodeSet() { return false; }
}