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 * regarding copyright ownership.  The ASF licenses this file   *
 * to you under the Apache License, Version 2.0 (the            *
 * "License"); you may not use this file except in compliance   *
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package org.apache.james.jmap.api.filtering.impl;

import java.util.List;

import javax.inject.Inject;

import org.apache.james.core.User;
import org.apache.james.eventsourcing.EventSourcingSystem;
import org.apache.james.eventsourcing.Subscriber;
import org.apache.james.eventsourcing.eventstore.EventStore;
import org.apache.james.jmap.api.filtering.FilteringManagement;
import org.apache.james.jmap.api.filtering.Rule;

import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableSet;

public class EventSourcingFilteringManagement implements FilteringManagement {

    private static final ImmutableSet<Subscriber> NO_SUBSCRIBER = ImmutableSet.of();

    private final EventStore eventStore;
    private final EventSourcingSystem eventSourcingSystem;

    @Inject
    public EventSourcingFilteringManagement(EventStore eventStore) {
        this.eventSourcingSystem = new EventSourcingSystem(
            ImmutableSet.of(new DefineRulesCommandHandler(eventStore)),
            NO_SUBSCRIBER,
            eventStore);
        this.eventStore = eventStore;
    }

    @Override
    public void defineRulesForUser(User user, List<Rule> rules) {
        eventSourcingSystem.dispatch(new DefineRulesCommand(user, rules));
    }

    @Override
    public List<Rule> listRulesForUser(User user) {
        Preconditions.checkNotNull(user);

        FilteringAggregateId aggregateId = new FilteringAggregateId(user);

        return FilteringAggregate
            .load(
                aggregateId,
                eventStore.getEventsOfAggregate(aggregateId))
            .listRules();
    }
}
