#include <assert.h>

#include "database-references.h"
#include "database.h"

RefFrom::RefFrom(RefTo * refTo, SegmentRefData * data) : refTo(refTo), data(data) {
    assert(refTo);
    assert(data);
    
    next = data->getRefFrom();
    prev = 0;
    data->setFirstRefFrom(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->setRefTo(0);
    delete refFrom;
}

SegmentRefData::SegmentRefData(Uint32 ptr, Segment * seg) : ptr(ptr), seg(seg) {
    seg->setSegmentRefData(ptr, this);
}

SegmentRefData::~SegmentRefData() {
    seg->setSegmentRefData(ptr, 0);
}