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Blazingly fast Minecraft world manipulation for artists, builders and everyone else.

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package com.fastasyncworldedit.core.jnbt;

import com.sk89q.jnbt.CompoundTag;
import com.sk89q.jnbt.NBTInputStream;
import com.sk89q.jnbt.Tag;
import net.jpountz.lz4.LZ4BlockInputStream;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

public abstract class CompressedCompoundTag extends CompoundTag {

    private T in;

    public CompressedCompoundTag(T in) {
        super(new HashMap<>());
        this.in = in;
    }

    @Override
    public Map getValue() {
        if (in != null) {
            decompress();
        }
        return super.getValue();
    }

    public abstract LZ4BlockInputStream adapt(T src) throws IOException;

    public T getSource() {
        return in;
    }

    private void decompress() {
        try (NBTInputStream nbtIn = new NBTInputStream(adapt(in))) {
            in = null;
            CompoundTag tag = (CompoundTag) nbtIn.readTag();
            Map value = tag.getValue();
            Map raw = super.getValue();
            raw.putAll(value);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

}