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package ilog.language.design.kernel;

/**
 * @version     Last modified on Thu Nov 21 04:27:55 2002 by Hak
 * @version          modified on Wed Jul 24 12:19:14 2002 by pviry
 * @author      <a href="mailto:hak@ilog.fr">Hassan A&iuml;t-Kaci</a>
 * @copyright   &copy; 2000-2002 <a href="http://www.ilog.fr/">ILOG, S.A.</a>
 */

import ilog.language.design.types.*;
import ilog.language.design.base.*;

public class Parameter extends ProtoExpression
{
  private String _name;
  private boolean _isInternal;

  final static Parameter VOID = new Parameter("");
  static { VOID.setType(Type.VOID); }

  private static int _nameCounter;

  public Parameter ()
    {
      _name = ("?"+(_nameCounter++)).intern();
      _isInternal = true;
    }

  public Parameter (String name)
    {
      _name = name.intern();
    }

  public Parameter (Type type)
    {
      this();
      addType(type);
    }

  public Parameter (String name, Type type)
    {
      this(name);
      addType(type);
    }

  public Parameter (Dummy dummy)
    {
      this(dummy.name());
      addTypes(dummy);
    }

  public final Expression copy ()
    {
      return new Parameter(_name);
    }

  public final Expression typedCopy ()
    {
      return new Parameter(_name).addTypes(this);
    }

  public final boolean isInternal ()
    {
      return _isInternal;
    }

  public final String name ()
    {
      return _name;
    }

  public final void setCheckedType ()
    {
      if (setCheckedTypeLocked()) return;
      _checkedType = type().copy();
    }

  public final void typeCheck (TypeChecker typeChecker) throws TypingErrorException
    {
      if (typeCheckLocked()) return;

      typeChecker.typeCheck(this,_type);
    }

  /**
   * A Parameter never gets to invoke this.
   */
  public final void compile (Compiler compiler)
    {
      throw new UnsupportedOperationException("method compile may not be called on a Parameter! ("
                                              +this+")");
    }

  public final String toString ()
    {
      return name();
      //return name() + " : " + (checkedType() == null ?  type() : checkedType());
    }

  // Added by PV
  public final String toTypedString ()
    {
      return toString() + (checkedType() == null ? "" : (" : " + checkedType()));
    }
}