def _importGenomeObjects(gtfFilePath, chroSet, genome, batchSize, verbose = 0) :
    """verbose must be an int [0, 4] for various levels of verbosity"""

    class Store(object) :
        
        def __init__(self, conf) :
            self.conf = conf
            self.chromosomes = {}
            
            self.genes = {}
            self.transcripts = {}
            self.proteins = {}
            self.exons = {}

        def batch_save(self) :
            self.conf.db.beginTransaction()
            
            for c in self.genes.itervalues() :
                c.save()
                conf.removeFromDBRegistery(c)
                
            for c in self.transcripts.itervalues() :
                c.save()
                conf.removeFromDBRegistery(c.exons)
                conf.removeFromDBRegistery(c)
            
            for c in self.proteins.itervalues() :
                c.save()
                conf.removeFromDBRegistery(c)
            
            self.conf.db.endTransaction()
            
            del(self.genes)
            del(self.transcripts)
            del(self.proteins)
            del(self.exons)
            
            self.genes = {}
            self.transcripts = {}
            self.proteins = {}
            self.exons = {}

            gc.collect()

        def save_chros(self) :
            pBar = ProgressBar(nbEpochs = len(self.chromosomes))
            for c in self.chromosomes.itervalues() :
                pBar.update(label = 'Chr %s' % c.number)
                c.save()
            pBar.close()
        
    printf('Importing gene set infos from %s...' % gtfFilePath)
    
    printf('Backuping indexes...')
    indexes = conf.db.getIndexes()
    printf("Droping all your indexes, (don't worry i'll restore them later)...")
    Genome_Raba.flushIndexes()
    Chromosome_Raba.flushIndexes()
    Gene_Raba.flushIndexes()
    Transcript_Raba.flushIndexes()
    Protein_Raba.flushIndexes()
    Exon_Raba.flushIndexes()
    
    printf("Parsing gene set...")
    gtf = GTFFile(gtfFilePath, gziped = True)
    printf('Done. Importation begins!')
    
    store = Store(conf)
    chroNumber = None
    pBar = ProgressBar(nbEpochs = len(gtf))
    for line in gtf :
        chroN = line['seqname']
        pBar.update(label = "Chr %s" % chroN)
        
        if (chroN.upper() in chroSet or chroN.lower() in chroSet):
            strand = line['strand']
            gene_biotype = line['gene_biotype']
            regionType = line['feature']
            frame = line['frame']

            start = int(line['start']) - 1
            end = int(line['end'])
            if start > end :
                start, end = end, start

            chroNumber = chroN.upper()
            if chroNumber not in store.chromosomes :
                store.chromosomes[chroNumber] = Chromosome_Raba()
                store.chromosomes[chroNumber].set(genome = genome, number = chroNumber)
            
            try :
                geneId = line['gene_id']
                geneName =  line['gene_name']
            except KeyError :
                geneId = None
                geneName = None
                if verbose :
                    printf('Warning: no gene_id/name found in line %s' % gtf[i])
            
            if geneId is not None :
                if geneId not in store.genes :
                    if len(store.genes) > batchSize :
                        store.batch_save()
                    
                    if verbose > 0 :
                        printf('\tGene %s, %s...' % (geneId, geneName))
                    store.genes[geneId] = Gene_Raba()
                    store.genes[geneId].set(genome = genome, id = geneId, chromosome = store.chromosomes[chroNumber], name = geneName, strand = strand, biotype = gene_biotype)
                if start < store.genes[geneId].start or store.genes[geneId].start is None :
                        store.genes[geneId].start = start
                if end > store.genes[geneId].end or store.genes[geneId].end is None :
                    store.genes[geneId].end = end
            try :
                transId = line['transcript_id']
                transName = line['transcript_name']
                try :
                    transcript_biotype = line['transcript_biotype']
                except KeyError :
                    transcript_biotype = None
            except KeyError :
                transId = None
                transName = None
                if verbose > 2 :
                    printf('\t\tWarning: no transcript_id, name found in line %s' % gtf[i])
            
            if transId is not None :
                if transId not in store.transcripts :
                    if verbose > 1 :
                        printf('\t\tTranscript %s, %s...' % (transId, transName))
                    store.transcripts[transId] = Transcript_Raba()
                    store.transcripts[transId].set(genome = genome, id = transId, chromosome = store.chromosomes[chroNumber], gene = store.genes.get(geneId, None), name = transName, biotype=transcript_biotype)
                if start < store.transcripts[transId].start or store.transcripts[transId].start is None:
                    store.transcripts[transId].start = start
                if end > store.transcripts[transId].end or store.transcripts[transId].end is None:
                    store.transcripts[transId].end = end
            
                try :
                    protId = line['protein_id']
                except KeyError :
                    protId = None
                    if verbose > 2 :
                        printf('Warning: no protein_id found in line %s' % gtf[i])

                # Store selenocysteine positions in transcript
                if regionType == 'Selenocysteine':
                    store.transcripts[transId].selenocysteine.append(start)
                        
                if protId is not None and protId not in store.proteins :
                    if verbose > 1 :
                        printf('\t\tProtein %s...' % (protId))
                    store.proteins[protId] = Protein_Raba()
                    store.proteins[protId].set(genome = genome, id = protId, chromosome = store.chromosomes[chroNumber], gene = store.genes.get(geneId, None), transcript = store.transcripts.get(transId, None), name = transName)
                    store.transcripts[transId].protein = store.proteins[protId]

                try :
                    exonNumber = int(line['exon_number']) - 1
                    exonKey = (transId, exonNumber)
                except KeyError :
                    exonNumber = None
                    exonKey = None
                    if verbose > 2 :
                        printf('Warning: no exon number or id found in line %s' % gtf[i])
                
                if exonKey is not None :
                    if verbose > 3 :
                        printf('\t\t\texon %s...' % (exonId))
                    
                    if exonKey not in store.exons and regionType == 'exon' :
                        store.exons[exonKey] = Exon_Raba()
                        store.exons[exonKey].set(genome = genome, chromosome = store.chromosomes[chroNumber], gene = store.genes.get(geneId, None), transcript = store.transcripts.get(transId, None), protein = store.proteins.get(protId, None), strand = strand, number = exonNumber, start = start, end = end)
                        store.transcripts[transId].exons.append(store.exons[exonKey])
                    
                    try :
                        store.exons[exonKey].id = line['exon_id']
                    except KeyError :
                        pass
                    
                    if regionType == 'exon' :
                        if start < store.exons[exonKey].start or store.exons[exonKey].start is None:
                            store.exons[exonKey].start = start
                        if end > store.transcripts[transId].end or store.exons[exonKey].end is None:
                            store.exons[exonKey].end = end
                    elif regionType == 'CDS' :
                        store.exons[exonKey].CDS_start = start
                        store.exons[exonKey].CDS_end = end
                        store.exons[exonKey].frame = frame
                    elif regionType == 'stop_codon' :
                        if strand == '+' :
                            if store.exons[exonKey].CDS_end != None :
                                store.exons[exonKey].CDS_end += 3
                                if store.exons[exonKey].end < store.exons[exonKey].CDS_end :
                                    store.exons[exonKey].end = store.exons[exonKey].CDS_end
                                if store.transcripts[transId].end < store.exons[exonKey].CDS_end :
                                    store.transcripts[transId].end = store.exons[exonKey].CDS_end
                                if store.genes[geneId].end < store.exons[exonKey].CDS_end :
                                    store.genes[geneId].end = store.exons[exonKey].CDS_end
                        if strand == '-' :
                            if store.exons[exonKey].CDS_start != None :
                                store.exons[exonKey].CDS_start -= 3
                                if store.exons[exonKey].start > store.exons[exonKey].CDS_start :
                                    store.exons[exonKey].start = store.exons[exonKey].CDS_start
                                if store.transcripts[transId].start > store.exons[exonKey].CDS_start :
                                    store.transcripts[transId].start = store.exons[exonKey].CDS_start
                                if store.genes[geneId].start > store.exons[exonKey].CDS_start :
                                    store.genes[geneId].start = store.exons[exonKey].CDS_start
    pBar.close()
    
    store.batch_save()
    
    conf.db.beginTransaction()
    printf('almost done saving chromosomes...')
    store.save_chros()
    
    printf('saving genome object...')
    genome.save()
    conf.db.endTransaction()
    
    conf.db.beginTransaction()
    printf('restoring core indexes...')
    # Genome.ensureGlobalIndex(('name', 'species'))
    # Chromosome.ensureGlobalIndex('genome')
    # Gene.ensureGlobalIndex('genome')
    # Transcript.ensureGlobalIndex('genome')
    # Protein.ensureGlobalIndex('genome')
    # Exon.ensureGlobalIndex('genome')
    Transcript.ensureGlobalIndex('exons')
    
    printf('commiting changes...')
    conf.db.endTransaction()
    
    conf.db.beginTransaction()
    printf('restoring user indexes')
    pBar = ProgressBar(label = "restoring", nbEpochs = len(indexes))
    for idx in indexes :
        pBar.update()
        conf.db.execute(idx[-1].replace('CREATE INDEX', 'CREATE INDEX IF NOT EXISTS'))
    pBar.close()
    
    printf('commiting changes...')
    conf.db.endTransaction()
    
    return store.chromosomes.values()
verbose must be an int [0, 4] for various levels of verbosity