NodeMap.cpp

/*
 
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*/
 
 
#include "NodeMap.hpp"
#include "Exception.hpp"
#include <cassert>
 
// Implementation
 
 
NodeMap::NodeMap(unsigned size)
    : mIsIdentity(true)
{
    mMap.resize(size);
}
 
void NodeMap::Resize(unsigned size)
{
    mMap.resize(size);
}
 
void NodeMap::ResetToIdentity()
{
    for (unsigned index=0; index<mMap.size(); index++)
    {
        mMap[index] = index;  // This is needed if we later diverge from identity (e.g. delete nodes)
    }
    mIsIdentity = true;
}
 
void NodeMap::SetNewIndex(unsigned oldIndex, unsigned newIndex)
{
    assert(oldIndex<mMap.size());
    mMap[oldIndex] = newIndex;
    if (mIsIdentity && (oldIndex != newIndex))
    {
        mIsIdentity = false;
    }
}
 
void NodeMap::SetDeleted(unsigned index)
{
    mMap[index] = UINT_MAX;
    mIsIdentity = false;
}
 
bool NodeMap::IsDeleted(unsigned index)
{
    return (mMap[index] == UINT_MAX);
}
 
unsigned NodeMap::GetNewIndex(unsigned oldIndex) const
{
    if (mIsIdentity)
    {
        return oldIndex;
    }
    if (mMap[oldIndex] == UINT_MAX)
    {
        EXCEPTION("Node has been deleted");
    }
    return mMap[oldIndex];
}
 
bool NodeMap::IsIdentityMap()
{
    return mIsIdentity;
}
 
unsigned NodeMap::GetSize()
{
    return mMap.size();
}