package com.jclark.xsl.expr;

import com.jclark.xsl.om.*;

class GlobalVariableRefExpr extends ConvertibleVariantExpr {
  private final Name name;
  private final Node node;

  GlobalVariableRefExpr(Name name, Node node) {
    this.name = name;
    this.node = node;
  }

  public Variant eval(Node sourceNode, ExprContext context) throws XSLException {
    Variant value = context.getGlobalVariableValue(name);
    if (value != null)
      return value;
    throw new XSLException("variable \"" + name + "\" not defined",
			   node);
  }
}