angry1980.audio.dao.TrackHashDAOInMemoryImpl Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of audio-fingerprint Show documentation

There is a newer version: 0.0.10

package angry1980.audio.dao;

import angry1980.audio.model.TrackHash;

import java.util.*;

public class TrackHashDAOInMemoryImpl implements TrackHashDAO {

    private int mask;
    private Map> index;

    public TrackHashDAOInMemoryImpl(){
        this(-1);
    }

    public TrackHashDAOInMemoryImpl(int mask){
        this.index = new HashMap<>();
        this.mask = mask;
    }

    @Override
    public Optional create(TrackHash hash) {
        index.computeIfAbsent(hash.getHash() & mask, l -> new ArrayList()).add(hash);
        return Optional.of(hash);
    }

    @Override
    public List findByHash(int hash) {
        return index.getOrDefault(hash & mask, Collections.emptyList());
    }
}