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package ilog.language.design.base;

/**
 * @version     Last modified on Fri Apr 05 12:40:37 2002 by hak
 * @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.Type;
import ilog.language.design.types.ClassType;
import ilog.language.design.types. ObjectInitializationException;
import ilog.language.design.backend.Runtime;
import ilog.language.design.backend.ObjectInstance;

public class PushNewObject extends Instruction implements PushValue, PushObject
{
  private ClassType _type;

  public PushNewObject (ClassType type)
    {
      setName("PUSH_NEW_OBJECT");
      _type = type;
    }

  final ClassType type ()
    {
      return _type;
    }

  public final void execute (Runtime r) throws ObjectInitializationException
    {
      ObjectInstance object = new ObjectInstance(_type);
      r.pushObject(object);

      r.saveState();
      _type.initialize(object,r);
      r.restoreState();
    }

  public final boolean equals (Object object)
    {
      if (this == object)
        return true;

      if (!(object instanceof PushNewObject))
        return false;

      return _type.name() == ((PushNewObject)object).type().name();
    }

  public final int hashCode ()
    {
      return name().hashCode() + _type.name().hashCode();
    }

  public final String toString ()
    {
      Type.resetNames();
      return name()+"("+_type+")";
    }
}