From 032a820e491335e36e7e67f7c908aef5d2caa10a Mon Sep 17 00:00:00 2001
From: Linas Vepstas <linas@linas.org>
Date: Sat, 16 Aug 2003 18:59:01 +0000
Subject: [PATCH] start trying to fix how the price db begin-edit/end-edit so
 that books can be closed.

git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@9094 57a11ea4-9604-0410-9ed3-97b8803252fd
---
 src/engine/gnc-pricedb-p.h |  5 ++-
 src/engine/gnc-pricedb.c   | 84 ++++++++++++++++++++++++++++++++++++++
 src/engine/gnc-pricedb.h   | 10 ++++-
 3 files changed, 96 insertions(+), 3 deletions(-)

diff --git a/src/engine/gnc-pricedb-p.h b/src/engine/gnc-pricedb-p.h
index a69ab22a42..90746b6ab7 100644
--- a/src/engine/gnc-pricedb-p.h
+++ b/src/engine/gnc-pricedb-p.h
@@ -62,7 +62,10 @@ struct gnc_price_s
 struct gnc_price_db_s
 {
   GHashTable *commodity_hash;
-  QofBook *book;   /* book to which this database and all the prices belong to */
+  QofBook *book;          /* book holding this database and all its prices */
+
+  /* 'private' object management fields */
+  gint32   editlevel;            /* nesting level of begin/end edit calls */
   gboolean dirty;
 };
 
diff --git a/src/engine/gnc-pricedb.c b/src/engine/gnc-pricedb.c
index 0d48aa2a41..ff89cc49a1 100644
--- a/src/engine/gnc-pricedb.c
+++ b/src/engine/gnc-pricedb.c
@@ -239,6 +239,88 @@ gnc_price_commit_edit (GNCPrice *p)
   LEAVE ("pr=%p, not-saved=%d do-free=%d", p, p->not_saved, p->do_free);
 }
 
+/* ==================================================================== */
+
+void 
+gnc_pricedb_begin_edit (GNCPriceDB *pdb)
+{
+  QofBackend *be;
+
+  if (!pdb) return;
+  pdb->editlevel++;
+  if (1 < pdb->editlevel) return;
+  ENTER ("pdb=%p\n", pdb);
+
+  if (0 >= pdb->editlevel)
+  {
+    PERR ("unbalanced call - resetting (was %d)", pdb->editlevel);
+    pdb->editlevel = 1;
+  }
+
+  /* See if there's a backend.  If there is, invoke it. */
+  be = xaccPriceDBGetBackend (pdb);
+  if (be && be->begin) 
+  {
+    (be->begin) (be, GNC_ID_PRICEDB, pdb);
+  }
+
+  LEAVE ("pdb=%p\n", pdb);
+}
+
+void 
+gnc_pricedb_commit_edit (GNCPriceDB *pdb)
+{
+  QofBackend *be;
+  if (!pdb) return;
+
+  pdb->editlevel--;
+  if (0 < pdb->editlevel) return;
+
+  ENTER ("pdb=%p\n", pdb);
+  if (0 > pdb->editlevel)
+  {
+    PERR ("unbalanced call - resetting (was %d)", pdb->editlevel);
+    pdb->editlevel = 0;
+  }
+
+  /* See if there's a backend.  If there is, invoke it. */
+  /* We may not be able to find the backend, so make not of that .. */
+  be = xaccPriceDBGetBackend (pdb);
+  if (be && be->commit) 
+  {
+    QofBackendError errcode;
+
+    /* clear errors */
+    do {
+      errcode = qof_backend_get_error (be);
+    } while (ERR_BACKEND_NO_ERR != errcode);
+
+    /* if we haven't been able to call begin edit before, call it now */
+    if (TRUE == pdb->dirty) 
+    {
+      if (be->begin)
+      {
+        (be->begin) (be, GNC_ID_PRICEDB, pdb);
+      }
+    }
+
+    (be->commit) (be, GNC_ID_PRICEDB, pdb);
+    errcode = qof_backend_get_error (be);
+    if (ERR_BACKEND_NO_ERR != errcode) 
+    {
+      /* XXX hack alert FIXME implement price rollback */
+      PERR (" backend asked engine to rollback, but this isn't"
+            " handled yet. Return code=%d", errcode);
+
+      /* push error back onto the stack */
+      qof_backend_set_error (be, errcode);
+    }
+  }
+  pdb->dirty = FALSE;
+
+  LEAVE ("pdb=%p\n", pdb);
+}
+
 /* ==================================================================== */
 /* setters */
 
@@ -641,6 +723,8 @@ gnc_pricedb_create(QofBook * book)
 
   result = g_new0(GNCPriceDB, 1);
   result->book = book;
+  result->editlevel = 0;
+  result->dirty = FALSE;
   result->commodity_hash = g_hash_table_new(commodity_hash, commodity_equal);
   g_return_val_if_fail (result->commodity_hash, NULL);
   return result;
diff --git a/src/engine/gnc-pricedb.h b/src/engine/gnc-pricedb.h
index da9e0e79b4..2c03f5dc58 100644
--- a/src/engine/gnc-pricedb.h
+++ b/src/engine/gnc-pricedb.h
@@ -1,6 +1,5 @@
 /********************************************************************
  * gnc-pricedb.h -- a simple price database for gnucash.            *
- * Copyright (C) 2001 Rob Browning, Linas Vepstas                   *
  *                                                                  *
  * This program is free software; you can redistribute it and/or    *
  * modify it under the terms of the GNU General Public License as   *
@@ -38,7 +37,8 @@
     @{ */
 /**********************************************************************/
 /** @file gnc-pricedb.h
-
+    @author Copyright (C) 2001 Rob Browning
+    @author Copyright (C) 2001,2003 Linas Vepstas <linas@linas.org>
     @brief a simple price database for gnucash
 
     The PriceDB is intended to be a database of price quotes, or more
@@ -202,9 +202,11 @@ gboolean        gnc_price_equal(GNCPrice *p1, GNCPrice *p2);
 /** gnc_price_list_insert - insert a price into the given list, calling
      gnc_price_ref on it during the process. */
 gboolean gnc_price_list_insert(GList **prices, GNCPrice *p);
+
 /** gnc_price_list_remove - remove the price, p, from the given list,
      calling gnc_price_unref on it during the process. */
 gboolean gnc_price_list_remove(GList **prices, GNCPrice *p);
+
 /** gnc_price_list_destroy - destroy the given price list, calling
      gnc_price_unref on all the prices included in the list. */
 void     gnc_price_list_destroy(GList *prices);
@@ -242,6 +244,10 @@ GNCPriceDB * gnc_pricedb_get_db(QofBook *book);
      prices.  Other code may still be holding references to them. */
 void gnc_pricedb_destroy(GNCPriceDB *db);
 
+/** Used for editing the pricedb en-mass */
+void gnc_pricedb_begin_edit (GNCPriceDB *);
+void gnc_pricedb_commit_edit (GNCPriceDB *);
+
 /** gnc_pricedb_add_price - add a price to the pricedb, you may drop
      your reference to the price (i.e. call unref) after this
      succeeds, whenever you're finished with the price. */