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/*
 * Copyright (C) 2020 Graylog, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the Server Side Public License, version 1,
 * as published by MongoDB, Inc.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * Server Side Public License for more details.
 *
 * You should have received a copy of the Server Side Public License
 * along with this program. If not, see
 * .
 */
package org.graylog.grn;

import javax.inject.Inject;
import java.util.Collection;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;

/**
 * Provides GRN descriptor instances.
 */
public class GRNDescriptorService {
    private final Map descriptorProviders;

    @Inject
    public GRNDescriptorService(Map descriptorProviders) {
        this.descriptorProviders = descriptorProviders;
    }

    /**
     * Returns the descriptor instance for the given GRN.
     *
     * @param grn the GRN
     * @return the descriptor instance for the GRN
     */
    public GRNDescriptor getDescriptor(GRN grn) {
        final GRNDescriptorProvider provider = descriptorProviders.get(grn.grnType());
        if (provider == null) {
            throw new IllegalStateException("Missing GRN descriptor provider for GRN type: " + grn.type());
        }
        return provider.get(grn);
    }

    /**
     * Returns descriptors for the given GRN collection.
     *
     * @param grns collection of GRNs
     * @return the descriptors for the given GRNs
     */
    public Set getDescriptors(Collection grns) {
        return grns.stream().map(this::getDescriptor).collect(Collectors.toSet());
    }
}