package com.jclark.xsl.expr;

import com.jclark.xsl.om.*;

abstract class ConvertibleVariantExpr extends ConvertibleExpr implements VariantExpr {

  ConvertibleVariantExpr makeVariantExpr() {
    return this;
  }

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

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

  ConvertibleNumberExpr makeNumberExpr() {
    return new ConvertibleNumberExpr() {
      public double eval(Node node, ExprContext context) throws XSLException {
	return ConvertibleVariantExpr.this.eval(node, context).convertToNumber();
      }
    };
  }

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

  ConvertibleNodeSetExpr makeNodeSetExpr() {
    return new ConvertibleNodeSetExpr() {
      public NodeIterator eval(Node node, ExprContext context) throws XSLException {
	return ConvertibleVariantExpr.this.eval(node, context).convertToNodeSet();
      }
    };
  }


}