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Eclipse JNoSQL mapping layer, Artemis, to ArangoDB

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/*
 *  Copyright (c) 2017 Otávio Santana and others
 *   All rights reserved. This program and the accompanying materials
 *   are made available under the terms of the Eclipse Public License v1.0
 *   and Apache License v2.0 which accompanies this distribution.
 *   The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
 *   and the Apache License v2.0 is available at http://www.opensource.org/licenses/apache2.0.php.
 *
 *   You may elect to redistribute this code under either of these licenses.
 *
 *   Contributors:
 *
 *   Otavio Santana
 */
package org.jnosql.artemis.arangodb.document;

import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;
import java.util.Optional;
import java.util.stream.Stream;

final class ParamUtil {

    private ParamUtil() {
    }

    static Map getParams(Object[] args, Method method) {

        Map jsonObject = new HashMap<>();
        Annotation[][] annotations = method.getParameterAnnotations();

        for (int index = 0; index < annotations.length; index++) {

            final Object arg = args[index];

            Optional param = Stream.of(annotations[index])
                    .filter(Param.class::isInstance)
                    .map(Param.class::cast)
                    .findFirst();
            param.ifPresent(p -> jsonObject.put(p.value(), arg));

        }

        return jsonObject;
    }
}