segment.cpp

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#include "segment.h"
#include "versioned.h"
#include "revision.h"
 
int Segment::versionCount = 0;
 
Segment::Segment() {
    parent = nullptr;
 
    version = versionCount++;
    refcount = 1;
}
 
Segment::Segment(std::shared_ptr<Segment> my_parent) {
    parent = my_parent;
    if (parent)
        parent->refcount++;
 
    version = versionCount++;
    refcount = 1;
}
 
void Segment::Release() {
    if (--refcount == 0) {
        for (auto &v: written) {
            v->Release(shared_from_this());
        }
        if (parent != NULL)
            parent->Release();
    }
}
 
void Segment::Collapse(std::shared_ptr<Revision> main) {
    while (parent != main->root && parent->refcount == 1) {
        for(auto &v : parent->written) {
            v->Collapse(main, parent);
        }
        parent = parent->parent; // remove parent
    }
}