org.jpmml.evaluator.IndexableUtil.java Source code

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Here is the source code for org.jpmml.evaluator.IndexableUtil.java

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/*
 * Copyright (c) 2015 Villu Ruusmann
 *
 * This file is part of JPMML-Evaluator
 *
 * JPMML-Evaluator is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * JPMML-Evaluator 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
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with JPMML-Evaluator.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.jpmml.evaluator;

import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

import com.google.common.collect.ImmutableMap;
import org.dmg.pmml.Indexable;
import org.dmg.pmml.PMMLObject;

public class IndexableUtil {

    private IndexableUtil() {
    }

    static public <K, E extends PMMLObject & Indexable<K>> E find(List<E> elements, K key) {

        for (E element : elements) {

            if ((key).equals(ensureKey(element))) {
                return element;
            }
        }

        return null;
    }

    static public <K, E extends PMMLObject & Indexable<K>> ImmutableMap<K, E> buildMap(List<E> elements) {
        Map<K, E> result = new LinkedHashMap<>();

        for (E element : elements) {
            K key = ensureKey(element);

            if (result.containsKey(key)) {
                throw new InvalidFeatureException(element);
            }

            result.put(key, element);
        }

        return ImmutableMap.copyOf(result);
    }

    static <K, E extends PMMLObject & Indexable<K>> K ensureKey(E element) {
        K key = element.getKey();

        if (key == null) {
            throw new InvalidFeatureException(element);
        }

        return key;
    }
}