package com.jclark.xsl.expr;

import com.jclark.xsl.om.*;

class ExtensionFunctionCallExpr extends ConvertibleVariantExpr {
  private final Name name;
  private final VariantExpr[] args;

  ExtensionFunctionCallExpr(Name name, VariantExpr[] args) {
    this.name = name;
    this.args = args;
  }

  public Variant eval(Node node, ExprContext context) throws XSLException {
    Object[] argValues = new Object[args.length];
    for (int i = 0; i < args.length; i++)
      argValues[i] = args[i].eval(node, context).convertToObject();
    Object obj
      = context.getExtensionContext(name.getNamespace()).call(name.getLocalPart(),
							      node,
							      argValues);
    return VariantBase.create(obj);
  }
}