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Concourse is a self-tuning database that is designed for both ad hoc analytics and high volume transactions at scale. Developers use Concourse to quickly build mission critical software while also benefiting from real time insight into their most important data. With Concourse, end-to-end data management requires no extra infrastructure, no prior configuration and no additional coding–all of which greatly reduce costs and allow developers to focus on core business problems.

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/*
 * Copyright (c) 2013-2019 Cinchapi Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.cinchapi.concourse.etl;

import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import java.util.stream.Collectors;

import com.cinchapi.common.collect.Collections;
import com.google.common.collect.LinkedHashMultimap;
import com.google.common.collect.Multimap;

/**
 * Static methods for common data processing functions.
 *
 * @author Jeff Nelson
 */
public final class Transform {

    /**
     * Convert the {@code data} to a {@link Multimap}.
     * 
     * All the elements in any top-level
     * {@link com.cinchapi.common.collect.Sequences#isSequence(Object)
     * sequences} are mapped in the standard rules for {@link Multimap
     * multimaps}.
     * 
     * 
     * @param data
     * @return a new {@link Multimap} that contains the information in
     *         {@code data}.
     */
    public static Multimap toMultimap(
            Map data) {
        Multimap multimap = LinkedHashMultimap.create();
        Strainer strainer = new Strainer(
                (key, value) -> multimap.put(key, value));
        strainer.process(data);
        return multimap;
    }

    /**
     * Convert the {@code data} to a Concourse style data record where each
     * value is a collection of one or more values. No nested container values
     * are further transformed.
     * 
     * @param data
     * @return a data record
     */
    public static Map> toRecord(Map data) {
        return toMultimap(data).asMap().entrySet().stream()
                .collect(Collectors.toMap(Entry::getKey, entry -> {
                    return Collections.ensureSet(entry.getValue());
                }));
    }

    private Transform() {/* no-init */}

}