package com.jclark.xsl.expr;

import com.jclark.xsl.om.*;

abstract class ConvertibleNumberExpr extends ConvertibleExpr implements NumberExpr {

  ConvertibleNumberExpr makeNumberExpr() {
    return this;
  }

  ConvertibleBooleanExpr makePredicateExpr() {
    return new ConvertibleBooleanExpr() {
      public boolean eval(Node node, ExprContext context) throws XSLException {
	return Converter.positionToBoolean(ConvertibleNumberExpr.this.eval(node, context),
					   context);
      }
    };
  }

  ConvertibleBooleanExpr makeBooleanExpr() {
    return new ConvertibleBooleanExpr() {
      public boolean eval(Node node, ExprContext context) throws XSLException {
	return Converter.toBoolean(ConvertibleNumberExpr.this.eval(node, context));
      }
    };
  }

  ConvertibleVariantExpr makeVariantExpr() {
    return new ConvertibleVariantExpr() {
      public Variant eval(Node node, ExprContext context) throws XSLException {
	return new NumberVariant(ConvertibleNumberExpr.this.eval(node, context));
      }
    };
  }

  ConvertibleStringExpr makeStringExpr() {
    return new ConvertibleStringExpr() {
      public String eval(Node node, ExprContext context) throws XSLException {
	return Converter.toString(ConvertibleNumberExpr.this.eval(node, context));
      }
    };
  }
}