From 6a653b35990e9a642dd4af9b8ee5742d5a84956c Mon Sep 17 00:00:00 2001
From: unknown <Pixel@.(none)>
Date: Wed, 16 Sep 2009 22:24:08 -0700
Subject: Adding basic Database structure.

---
 Database/internals/database-references.cpp | 47 ++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 Database/internals/database-references.cpp

(limited to 'Database/internals/database-references.cpp')

diff --git a/Database/internals/database-references.cpp b/Database/internals/database-references.cpp
new file mode 100644
index 0000000..8520f16
--- /dev/null
+++ b/Database/internals/database-references.cpp
@@ -0,0 +1,47 @@
+#include "database-references.h"
+
+RefFrom::RefFrom(RefTo * refTo, SegmentRefData * data) : refTo(refTo), data(data) {
+    assert(refto);
+    assert(data);
+    
+    next = data->getRefFrom();
+    prev = 0;
+    data->firstRefFrom = this;
+    if (next)
+        next->prev = this;
+}
+
+RefFrom::~RefFrom() {
+    if (next)
+        next->prev = prev;
+    if (prev)
+        prev->next = next;
+    else
+        data->setFirstRefFrom(next);
+}
+
+RefTo::RefTo(absolute_ptr ptr, SegmentRefData * data, Database * database) : data(data) {
+    assert(database);
+    Segment * destSeg = database->getSegment(ptr.segment_id);
+    assert(destSeg);
+    refFrom = new RefFrom(this, destSeg->getSegmentRefData(ptr.ptr);
+    
+    RefTo * t = data->getRefTo();
+    if (t) {
+        delete t;
+        data->setRefTo(this);
+    }
+}
+
+RefTo::~RefTo() {
+    data->refTo = 0;
+    delete refFrom;
+}
+
+SegmentRefData::SegmentRefData(Uint32 ptr, Segment * seg) : ptr(ptr), seg(seg) {
+    seg->setSegmentRefData(ptr, this);
+}
+
+SegmentRefData::~SegmentRefData() {
+    seg->setSegmentRefData(ptr, 0);
+}
-- 
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