From 25d12538af49bcb89b7c1fa059d07372293f4527 Mon Sep 17 00:00:00 2001
From: Tejas Dinkar <tejas@gja.in>
Date: Sun, 5 Jun 2011 21:09:26 +0530
Subject: [PATCH] Added a method to get and set extra pointers

---
 ext/downpour/downpour.h          |  3 +++
 ext/downpour/memory_allocation.c | 27 +++++++++++++++++++++++++++
 spec/downpour/column_spec.rb     |  4 ++++
 3 files changed, 34 insertions(+)

diff --git a/ext/downpour/downpour.h b/ext/downpour/downpour.h
index 8957637..8862935 100644
--- a/ext/downpour/downpour.h
+++ b/ext/downpour/downpour.h
@@ -19,6 +19,8 @@ void *downpour_from_ruby_object(VALUE value);
 VALUE downpour_to_ruby_object(void *ptr, VALUE klass, VALUE parent, FREE_METHOD free_method, SET_CONTEXT set_context);
 VALUE downpour_get_ruby_object(void *ptr);
 VALUE downpour_get_parent(VALUE self);
+void downpour_set_extra_pointer(VALUE self, void *extra_pointer, FREE_METHOD free_extra_pointer);
+void *downpour_get_extra_pointer(VALUE self);
 
 // All Constructors
 VALUE downpour_constructor(drizzle_st *self_ptr);
@@ -39,6 +41,7 @@ const char *drizzle_gem_read_string_with_default(VALUE string, const char *defau
 #define read_string(value, default_value) drizzle_gem_read_string_with_default(value, default_value)
 #define drizzle_alloc(type) ((type *) malloc(sizeof(type)))
 #define to_ruby_object(ptr, klass, parent, free_method, set_context) downpour_to_ruby_object(ptr, klass, parent, (FREE_METHOD) (free_method), (SET_CONTEXT) (set_context))
+#define set_extra_pointer(value, ptr, free_method) downpour_set_extra_pointer(value, ptr, (FREE_METHOD) free_method)
 
 // Property Macros -> define attr(foo, conversion) and settr_string to use them
 #define attr_string(foo) attr(foo, rb_str_new2)
diff --git a/ext/downpour/memory_allocation.c b/ext/downpour/memory_allocation.c
index 78316e4..23da075 100644
--- a/ext/downpour/memory_allocation.c
+++ b/ext/downpour/memory_allocation.c
@@ -6,6 +6,8 @@ typedef struct DownpourWrapper {
   struct DownpourWrapper *parent;
   FREE_METHOD free_method;
   VALUE rb_object;
+  void *extra_pointer;
+  FREE_METHOD free_extra_pointer_method;
 } DownpourWrapper;
 
 static void downpour_mark(DownpourWrapper *wrapper)
@@ -16,6 +18,14 @@ static void downpour_mark(DownpourWrapper *wrapper)
   wrapper->reference_count++;
 }
 
+static void free_extra_pointer(DownpourWrapper *wrapper)
+{
+  if(wrapper->extra_pointer == NULL || wrapper->free_extra_pointer_method == NULL)
+    return;
+
+  wrapper->free_extra_pointer_method(wrapper->extra_pointer);
+}
+
 static void downpour_release(DownpourWrapper *wrapper)
 {
   if(wrapper == NULL)
@@ -24,6 +34,7 @@ static void downpour_release(DownpourWrapper *wrapper)
   wrapper->reference_count--;
 
   if(wrapper->reference_count == 0) {
+    free_extra_pointer(wrapper);
     wrapper->free_method(wrapper->ptr);
     downpour_release(wrapper->parent);
     free(wrapper);
@@ -37,6 +48,8 @@ static DownpourWrapper *downpour_wrap_pointer(void *ptr, DownpourWrapper *parent
   wrapper->parent = parent;
   wrapper->free_method = free_method;
   wrapper->reference_count = 0;
+  wrapper->extra_pointer = NULL;
+  wrapper->free_extra_pointer_method = NULL;
 
   downpour_mark(parent);
   downpour_mark(wrapper);
@@ -101,3 +114,17 @@ VALUE downpour_get_parent(VALUE self)
 
   return wrapper->parent->rb_object;
 }
+
+void downpour_set_extra_pointer(VALUE self, void *extra_pointer, FREE_METHOD free_extra_pointer_method)
+{
+  DownpourWrapper *wrapper = get_wrapper_from_object(self);
+  free_extra_pointer(wrapper);
+  wrapper->extra_pointer = extra_pointer;
+  wrapper->free_extra_pointer_method = free_extra_pointer_method;
+}
+
+void *downpour_get_extra_pointer(VALUE self)
+{
+  DownpourWrapper *wrapper = get_wrapper_from_object(self);
+  return wrapper->extra_pointer;
+}
diff --git a/spec/downpour/column_spec.rb b/spec/downpour/column_spec.rb
index ff08cec..9b859ce 100644
--- a/spec/downpour/column_spec.rb
+++ b/spec/downpour/column_spec.rb
@@ -26,4 +26,8 @@
   it "should have table name set on column" do
     @results.columns[0].table.should == "Test2"
   end
+
+  it "should return the same column each time" do
+    @results.columns[0].should == @results.columns[0]
+  end
 end