flatbuffers pack nested vector

flatbuffers-vector.go

func (term *Term) Encode(version string) []byte {
	builder := flatbuffers.NewBuilder(0)

	// Preprocess the shotguns
	shotguns := make([]flatbuffers.UOffsetT, len(term.Shotgun))
	shotgunStrs := make([]flatbuffers.UOffsetT, len(term.Shotgun))
	for i := 0; i < len(term.Shotgun); i++ {
		shotgunStrs[i] = builder.CreateString(term.Shotgun[i].Term)
	}
	for i := 0; i < len(term.Shotgun); i++ {
		sjfb.ShotgunStart(builder)
		sjfb.ShotgunAddTerm(builder, shotgunStrs[i])
		sjfb.ShotgunAddPotency(builder, term.Shotgun[i].Potency)
		shotguns[i] = sjfb.ShotgunEnd(builder)
	}
	sjfb.TermStartShotgunVector(builder, len(term.Shotgun))
	for i := len(term.Shotgun) - 1; i >= 0; i-- {
		//for i := 0; i < len(term.Shotgun); i++ {
		builder.PrependUOffsetT(shotguns[i])
	}
	shotgun_vec := builder.EndVector(len(term.Shotgun))

	// Preprocess the clues
	clueStrs := make([]flatbuffers.UOffsetT, len(term.Clues))
	introStrs := make([]flatbuffers.UOffsetT, len(term.Clues))
	for i := 0; i < len(term.Clues); i++ {
		clueStrs[i] = builder.CreateString(term.Clues[i].Term)
	}
	for i := 0; i < len(term.Clues); i++ {
		introStrs[i] = builder.CreateString(term.Clues[i].Intro)
	}
	clues := make([]flatbuffers.UOffsetT, len(term.Clues))
	for i := 0; i < len(term.Clues); i++ {
		sjfb.ClueStart(builder)
		sjfb.ClueAddTerm(builder, clueStrs[i])
		sjfb.ClueAddIntro(builder, introStrs[i])
		sjfb.ClueAddPotency(builder, term.Clues[i].Potency)
		clues[i] = sjfb.ClueEnd(builder)
	}
	sjfb.TermStartCluesVector(builder, len(term.Clues))
	for i := len(term.Clues) - 1; i >= 0; i-- {
		//for i := 0; i < len(term.Clues); i++ {
		builder.PrependUOffsetT(clues[i])
	}
	clues_vec := builder.EndVector(len(term.Clues))

	// Start packing the final term
	sjfb.TermStart(builder)

	termStr := builder.CreateString(term.TermStr)
	sjfb.TermAddTermStr(builder, termStr)
	sjfb.TermAddSlot(builder, term.Slot)
	sjfb.TermAddNumDocuments(builder, term.NumDocuments)
	sjfb.TermAddNumWords(builder, int16(term.NumWords))
	sjfb.TermAddShotgun(builder, shotgun_vec)
	sjfb.TermAddClues(builder, clues_vec)

	sjfb.TermAddInteractionPos(builder, int16(term.InteractionsPos))
	sjfb.TermAddInteractionNeg(builder, int16(term.InteractionsNeg))
	sjfb.TermAddHardcodedScore(builder, int16(term.HardcodedScore))
	sjfb.TermAddInfogain(builder, term.Infogain)

	obj := sjfb.TermEnd(builder)
	builder.Finish(obj)

	return builder.Bytes[builder.Head():]
}