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+// This may look like C, but it's really -*- C++ -*-
+// $Id$
+/*
+
+COPYRIGHT
+
+Copyright 1992, 1993, 1994 Sun Microsystems, Inc.  Printed in the United
+States of America.  All Rights Reserved.
+
+This product is protected by copyright and distributed under the following
+license restricting its use.
+
+The Interface Definition Language Compiler Front End (CFE) is made
+available for your use provided that you include this license and copyright
+notice on all media and documentation and the software program in which
+this product is incorporated in whole or part. You may copy and extend
+functionality (but may not remove functionality) of the Interface
+Definition Language CFE without charge, but you are not authorized to
+license or distribute it to anyone else except as part of a product or
+program developed by you or with the express written consent of Sun
+Microsystems, Inc. ("Sun").
+
+The names of Sun Microsystems, Inc. and any of its subsidiaries or
+affiliates may not be used in advertising or publicity pertaining to
+distribution of Interface Definition Language CFE as permitted herein.
+
+This license is effective until terminated by Sun for failure to comply
+with this license.  Upon termination, you shall destroy or return all code
+and documentation for the Interface Definition Language CFE.
+
+INTERFACE DEFINITION LANGUAGE CFE IS PROVIDED AS IS WITH NO WARRANTIES OF
+ANY KIND INCLUDING THE WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS
+FOR A PARTICULAR PURPOSE, NONINFRINGEMENT, OR ARISING FROM A COURSE OF
+DEALING, USAGE OR TRADE PRACTICE.
+
+INTERFACE DEFINITION LANGUAGE CFE IS PROVIDED WITH NO SUPPORT AND WITHOUT
+ANY OBLIGATION ON THE PART OF Sun OR ANY OF ITS SUBSIDIARIES OR AFFILIATES
+TO ASSIST IN ITS USE, CORRECTION, MODIFICATION OR ENHANCEMENT.
+
+SUN OR ANY OF ITS SUBSIDIARIES OR AFFILIATES SHALL HAVE NO LIABILITY WITH
+RESPECT TO THE INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY
+INTERFACE DEFINITION LANGUAGE CFE OR ANY PART THEREOF.
+
+IN NO EVENT WILL SUN OR ANY OF ITS SUBSIDIARIES OR AFFILIATES BE LIABLE FOR
+ANY LOST REVENUE OR PROFITS OR OTHER SPECIAL, INDIRECT AND CONSEQUENTIAL
+DAMAGES, EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+
+Use, duplication, or disclosure by the government is subject to
+restrictions as set forth in subparagraph (c)(1)(ii) of the Rights in
+Technical Data and Computer Software clause at DFARS 252.227-7013 and FAR
+52.227-19.
+
+Sun, Sun Microsystems and the Sun logo are trademarks or registered
+trademarks of Sun Microsystems, Inc.
+
+SunSoft, Inc.
+2550 Garcia Avenue
+Mountain View, California  94043
+
+NOTE:
+
+SunOS, SunSoft, Sun, Solaris, Sun Microsystems or the Sun logo are
+trademarks or registered trademarks of Sun Microsystems, Inc.
+
+*/
+
+#ifndef _AST_INTERFACE_AST_INTERFACE_HH
+#define _AST_INTERFACE_AST_INTERFACE_HH
+
+// NOTE: add (AST_EnumValue *) is defined here because enums can
+// be defined manifest locally; the constants defined in these
+// enums are inserted in the enclosing scope.
+
+#include "ast_type.h"
+#include "utl_scope.h"
+#include "ace/Unbounded_Queue.h"
+
+class TAO_IDL_FE_Export AST_Interface : public virtual AST_Type,
+                                        public virtual UTL_Scope
+{
+public:
+  AST_Interface (void);
+
+  AST_Interface (UTL_ScopedName *n,
+                 AST_Interface **ih,
+                 long nih,
+                 AST_Interface **ih_flat,
+                 long nih_flat,
+                 bool local,
+                 bool abstract);
+
+  virtual ~AST_Interface (void);
+
+  // This serves for interfaces, value types, components, and eventtypes.
+  static void fwd_redefinition_helper (AST_Interface *&i,
+                                       UTL_Scope *s);
+
+  // Overridden for valuetypes, components, and eventtypes.
+  virtual void redefine (AST_Interface *from);
+
+  AST_Interface **inherits (void) const;
+
+  long n_inherits (void) const;
+
+  AST_Interface **inherits_flat (void) const;
+
+  long n_inherits_flat (void) const;
+
+  ACE_Unbounded_Queue<AST_Interface *> &get_insert_queue (void);
+  ACE_Unbounded_Queue<AST_Interface *> &get_del_queue (void);
+
+  AST_Operation *be_add_operation (AST_Operation *);
+
+  void be_replace_operation (AST_Decl *old_op,
+                             AST_Decl *new_op);
+
+  // Is this interface defined? This predicate returns FALSE when an
+  // interface was forward declared but not defined yet, and TRUE in
+  // all other cases.
+  bool is_defined (void);
+
+  // Check if we have redefined any of our parents' operations or attributes,
+  // and check if there is such a clash among the parents
+  virtual bool redef_clash (void);
+
+  // Accessors for the member.
+  bool home_equiv (void) const;
+  void home_equiv (bool val);
+  
+  // Accessors for the member.
+  AST_InterfaceFwd *fwd_decl (void) const;
+  void fwd_decl (AST_InterfaceFwd *node);
+
+  // Look through inherited interfaces.
+  virtual AST_Decl *look_in_inherited (UTL_ScopedName *e,
+                                       bool treat_as_ref);
+
+  // Recursively called on valuetype to check for legal use as
+  // a primary key. Overridden for valuetype, struct, sequence,
+  // union, array, typedef, and interface.
+  virtual bool legal_for_primary_key (void) const;
+
+  // Cleanup function.
+  virtual void destroy (void);
+
+  // Narrowing.
+  DEF_NARROW_METHODS2(AST_Interface, AST_Type, UTL_Scope);
+  DEF_NARROW_FROM_DECL(AST_Interface);
+  DEF_NARROW_FROM_SCOPE(AST_Interface);
+
+  // AST Dumping.
+  virtual void dump (ACE_OSTREAM_TYPE &o);
+
+  // Visiting.
+  virtual int ast_accept (ast_visitor *visitor);
+
+protected:
+  // Data.
+
+  // Immediate ancestors.
+  AST_Interface **pd_inherits;
+  long pd_n_inherits;
+
+  // All ancestors.
+  AST_Interface **pd_inherits_flat;
+  long pd_n_inherits_flat;
+
+  // Queue data structure needed for breadth-first traversal of
+  // inheritance tree.
+  ACE_Unbounded_Queue<AST_Interface *> insert_queue;
+
+  // For a special case of a deeply nested inheritance graph and one specific
+  // way of inheritance in which a node that was already visited,
+  // but is not present in
+  // the queue, gets inserted at the tail. This situation arises when a node
+  // multiply inherits from two or more interfaces in which the first parent is
+  // higher up in the tree than the second parent. In addition, if the second
+  // parent turns out to be a child of the first .
+
+  // Queue of dequeued nodes to be searched for the above case.
+  ACE_Unbounded_Queue<AST_Interface *> del_queue;
+
+  // Are we the equivalent interface of a home?
+  bool home_equiv_;
+  
+  // The forward declaration we may have been created from.
+  AST_InterfaceFwd *fwd_decl_;
+
+protected:
+  // Scope Management Protocol.
+  friend int tao_yyparse (void);
+  friend class IDL_GlobalData;
+
+  virtual AST_Constant *fe_add_constant (AST_Constant *c);
+
+  virtual AST_Exception *fe_add_exception (AST_Exception *e);
+
+  virtual AST_Attribute *fe_add_attribute (AST_Attribute *a);
+
+  virtual AST_Field *fe_add_field (AST_Field *o);
+
+  virtual AST_Operation *fe_add_operation (AST_Operation *o);
+
+  virtual AST_Union *fe_add_union (AST_Union *u);
+
+  virtual AST_Structure *fe_add_structure (AST_Structure *s);
+
+  virtual AST_UnionFwd *fe_add_union_fwd (AST_UnionFwd *u);
+
+  virtual AST_StructureFwd *fe_add_structure_fwd (AST_StructureFwd *s);
+
+  virtual AST_Enum *fe_add_enum (AST_Enum *e);
+
+  virtual AST_EnumVal *fe_add_enum_val (AST_EnumVal *v);
+
+  virtual AST_Typedef *fe_add_typedef (AST_Typedef *t);
+
+  virtual AST_Native *fe_add_native (AST_Native *n);
+
+  // Lookup based on the local name, override of UTL_Scope definition.
+  // This version checks for redefinitions of attributes or operations.
+  AST_Decl *lookup_for_add (AST_Decl *d,
+                            bool treat_as_ref);
+
+  void redef_clash_populate_r (AST_Interface *t);
+  // Populate the insert queue with our parents, and, if we are a
+  // valuetype, with our supported interface and our parents'
+  // supported interfaces.
+
+  int insert_non_dup (AST_Interface *t,
+                      bool abstract_paths_only = false);
+  // Do non-duplicating insert of bi, by searching both the
+  // insert queue and the delete queue.
+};
+
+#endif           // _AST_INTERFACE_AST_INTERFACE_HH