From 736637680ac7b2cd0d0b878401a7e044fde0ee6a Mon Sep 17 00:00:00 2001
From: Frederico Linhares <fred@linhares.blue>
Date: Tue, 31 Dec 2024 12:32:36 -0300
Subject: refa Split BluCat into several namespaces

---
 src/blu_cat/com/command.cpp | 78 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 src/blu_cat/com/command.cpp

(limited to 'src/blu_cat/com/command.cpp')

diff --git a/src/blu_cat/com/command.cpp b/src/blu_cat/com/command.cpp
new file mode 100644
index 0000000..a1d3240
--- /dev/null
+++ b/src/blu_cat/com/command.cpp
@@ -0,0 +1,78 @@
+/*
+ * Copyright 2022 Frederico de Oliveira Linhares
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stdlib.h>
+
+#include "command.hpp"
+
+CommandError::CommandError(const std::string &m):
+  error(m)
+{
+}
+
+CommandError::CommandError(const char &m):
+  CommandError{std::string{m}}
+{
+}
+
+const char* CommandError::what() const noexcept
+{
+  return this->error.c_str();
+}
+
+CommandChain::CommandChain(std::initializer_list<Command> commands)
+{
+  for(auto c: commands) this->add(c);
+}
+
+void
+CommandChain::partial_revert(void *obj, int32_t step) const
+{
+  // Already unloaded, nothing to do.
+  if(step <= 0) return;
+
+  for(; step > 0; step--)
+  {
+    auto command = this->_commands[step -1].undo_command;
+    if(command != nullptr) command(obj);
+  }
+}
+
+void
+CommandChain::add(const Command &c)
+{
+  this->_commands.push_back(c);
+}
+
+void
+CommandChain::execute(void *obj) const
+{
+  for(auto i{0}; i < this->_commands.size(); i++)
+  {
+    try { this->_commands[i].do_command(obj); }
+    catch(const CommandError &error)
+    {
+      this->partial_revert(obj, i);
+      throw;
+    }
+  }
+}
+
+void
+CommandChain::revert(void *obj) const
+{
+  this->partial_revert(obj, this->_commands.size());
+}
-- 
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