294 lines
6.5 KiB
C
294 lines
6.5 KiB
C
/*
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* Copyright (C) 2012 - Juan Ferrer Toribio
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "sql-batch.h"
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#include "sql-value.h"
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/**
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* SECTION: sql-batch
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* @Short_description: binds identifiers with #SqlObject
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* @Title: SqlBatch
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*
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* The #SqlBatch is a collection of identifiers bound to #SqlObject in
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* an SQL statement. These identifiers are replaced by the value represented
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* by the #SqlObject when the statement is renderend.
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**/
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G_DEFINE_TYPE (SqlBatch, sql_batch, G_TYPE_INITIALLY_UNOWNED);
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enum {
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CHANGED
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,LAST_SIGNAL
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};
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static guint signals[LAST_SIGNAL] = {0};
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SqlBatch * sql_batch_new ()
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{
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return g_object_new (SQL_TYPE_BATCH, NULL);
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}
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//+++++++++++++++++++++++++++++++++++++++++++++++++++ Private
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static void sql_batch_item_changed (SqlObject * item, SqlBatch * self)
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{
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if (!self->frozen)
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sql_batch_changed (self);
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}
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static void sql_batch_free_item (SqlBatch * self, SqlObject * item)
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{
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if (item)
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{
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g_signal_handlers_disconnect_by_func (item,
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sql_batch_item_changed, self);
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g_object_unref (item);
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}
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}
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//+++++++++++++++++++++++++++++++++++++++++++++++++++ Public
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/**
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* sql_batch_is_ready:
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* @self: a #SqlBatch
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*
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* Checks if @self and all of its elements are ready to be rendered.
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*
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* Return value: %TRUE if ready, %FALSE otherwise.
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**/
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gboolean sql_batch_is_ready (SqlBatch * self)
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{
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gpointer item;
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GHashTableIter iter;
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g_return_val_if_fail (SQL_IS_BATCH (self), FALSE);
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g_hash_table_iter_init (&iter, self->items);
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while (g_hash_table_iter_next (&iter, NULL, &item))
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if (!item || !sql_object_is_ready (item))
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return FALSE;
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return TRUE;
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}
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/**
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* sql_batch_get:
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* @self: a #SqlBatch
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* @id: the id of the #SqlHolder
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*
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* Gets a held object by its id.
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*
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* Return value: (transfer none): the #SqlObject if an object with that id
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* exists, %NULL otherwise
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**/
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SqlObject * sql_batch_get (SqlBatch * self, const gchar * id)
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{
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g_return_val_if_fail (SQL_IS_BATCH (self), NULL);
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g_return_val_if_fail (id, NULL);
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if (self->items)
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return g_hash_table_lookup (self->items, id);
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return NULL;
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}
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/**
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* sql_batch_add:
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* @self: a #SqlBatch
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* @id: the id of the #SqlHolder
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* @item: the #SqlObject
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*
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* Adds a new item to the batch.
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**/
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void sql_batch_add (SqlBatch * self, const gchar * id, SqlObject * item)
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{
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g_return_if_fail (SQL_IS_BATCH (self));
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g_return_if_fail (id);
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g_return_if_fail (SQL_IS_OBJECT (item) || !item);
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sql_batch_remove (self, id);
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if (item)
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{
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g_object_ref_sink (item);
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g_signal_connect (item, "changed",
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G_CALLBACK (sql_batch_item_changed), self);
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}
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g_hash_table_replace (self->items, g_strdup (id), item);
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sql_batch_item_changed (NULL, self);
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}
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/**
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* sql_batch_add_param:
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* @self: a #SqlBatch
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* @id: the id assigned to the item
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* @param: the parameter
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**/
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void sql_batch_add_from_param (SqlBatch * self, const gchar * id, GvnParam * param)
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{
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g_return_if_fail (SQL_IS_BATCH (self));
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g_return_if_fail (id);
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g_return_if_fail (GVN_IS_PARAM (param));
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sql_batch_add (self, id, sql_value_new_with_param (param));
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}
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/**
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* sql_batch_add_value:
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* @self: a #SqlBatch
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* @id: the id assigned to the item
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* @value: the value
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**/
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void sql_batch_add_from_value (SqlBatch * self, const gchar * id, const GValue * value)
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{
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g_return_if_fail (SQL_IS_BATCH (self));
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g_return_if_fail (id);
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g_return_if_fail (G_IS_VALUE (value));
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sql_batch_add (self, id, sql_value_new_with_value (value));
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}
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/**
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* sql_batch_remove:
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* @self: a #SqlBatch
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* @id: the id of the #SqlHolder
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*
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* Removes a held object from the batch.
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**/
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void sql_batch_remove (SqlBatch * self, const gchar * id)
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{
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g_return_val_if_fail (SQL_IS_BATCH (self), NULL);
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g_return_val_if_fail (id, NULL);
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SqlObject * item = sql_batch_get (self, id);
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if (item)
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{
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sql_batch_free_item (self, item);
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g_hash_table_remove (self->items, id);
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}
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}
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/**
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* sql_batch_merge:
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* @self: a #SqlBatch
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* @batch: a #SqlBatch
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*
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* Meges the batch with another batch.
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**/
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void sql_batch_merge (SqlBatch * self, SqlBatch * batch)
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{
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GHashTableIter iter;
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gpointer key, value;
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g_return_if_fail (SQL_IS_BATCH (self));
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g_return_if_fail (SQL_IS_BATCH (batch) || !batch);
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if (!batch)
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return;
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g_hash_table_iter_init (&iter, batch->items);
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while (g_hash_table_iter_next (&iter, &key, &value))
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sql_batch_add (self, key, value);
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}
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/**
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* sql_batch_changed:
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* @self: a #SqlBatch
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*
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* Emits the changed signal on #SqlBatch.
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**/
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void sql_batch_changed (SqlBatch * self)
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{
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g_return_if_fail (SQL_IS_BATCH (self));
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g_signal_emit (self, signals[CHANGED], 0);
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}
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/**
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* sql_batch_freeze:
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* @self: a #SqlBatch
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*
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* Freezes the changed signal on #SqlBatch.
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**/
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void sql_batch_freeze (SqlBatch * self)
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{
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g_return_if_fail (SQL_IS_BATCH (self));
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self->frozen = TRUE;
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}
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/**
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* sql_batch_unfreeze:
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* @self: a #SqlBatch
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*
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* Unfreezes the changed signal on #SqlBatch.
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**/
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void sql_batch_unfreeze (SqlBatch * self)
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{
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g_return_if_fail (SQL_IS_BATCH (self));
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self->frozen = FALSE;
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}
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//+++++++++++++++++++++++++++++++++++++++++++++++++++ Class
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static void sql_batch_init (SqlBatch * self)
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{
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self->items = g_hash_table_new_full (
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g_str_hash
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,g_str_equal
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,g_free
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,NULL
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);
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self->frozen = FALSE;
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}
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static void sql_batch_finalize (SqlBatch * self)
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{
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gpointer item;
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GHashTableIter iter;
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g_hash_table_iter_init (&iter, self->items);
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while (g_hash_table_iter_next (&iter, NULL, &item))
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sql_batch_free_item (self, item);
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g_hash_table_destroy (self->items);
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G_OBJECT_CLASS (sql_batch_parent_class)->finalize (G_OBJECT (self));
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}
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static void sql_batch_class_init (SqlBatchClass * klass)
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{
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G_OBJECT_CLASS (klass)->finalize = (GObjectFinalizeFunc) sql_batch_finalize;
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/**
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* SqlBatch::changed:
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* @self: the object which emit the signal.
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*
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* This signal is emitted every time the batch or one of its attributes
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* is modified.
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*/
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signals[CHANGED] = g_signal_new ("changed", SQL_TYPE_BATCH,
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G_SIGNAL_RUN_FIRST, 0, NULL, NULL,
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g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0
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);
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}
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