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A Java persistence layer based on JOOQ for high performance and business flow support.

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package com.kenshoo.pl.simulation.internal;

import com.google.common.collect.Maps;
import com.kenshoo.pl.entity.*;
import com.kenshoo.pl.entity.spi.OutputGenerator;
import java.util.Collection;
import java.util.Map;
import java.util.stream.Stream;
import static java.util.stream.Collectors.toMap;


public class InitialStateRecorder> implements OutputGenerator {

    private final Collection> fields;
    private Map, CurrentEntityState> entities = Maps.newHashMap();

    public InitialStateRecorder(Collection> fields) {
        this.fields = fields;
    }

    @Override
    public void generate(Collection> commands, ChangeOperation op, ChangeContext ctx) {
        this.entities = commands.stream().collect(toMap(EntityChange::getIdentifier, ctx::getEntity));
    }

    @Override
    public Stream> requiredFields(Collection> fieldsToUpdate, ChangeOperation changeOperation) {
        return requiredFields();
    }

    public Entity get(Identifier id) {
        return entities.get(id);
    }

    private Stream> requiredFields() {
        return fields.stream();
    }

}