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OpenSearch subproject :libs:opensearch-ssl-config

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/*
 * SPDX-License-Identifier: Apache-2.0
 *
 * The OpenSearch Contributors require contributions made to
 * this file be licensed under the Apache-2.0 license or a
 * compatible open source license.
 */

/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch licenses this file to you 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.
 */

/*
 * Modifications Copyright OpenSearch Contributors. See
 * GitHub history for details.
 */

package org.opensearch.common.ssl;

import javax.net.ssl.X509ExtendedKeyManager;

import java.nio.file.Path;
import java.util.Collection;
import java.util.Collections;

/**
 * A {@link SslKeyConfig} that does nothing (provides a null key manager)
 */
final class EmptyKeyConfig implements SslKeyConfig {

    static final EmptyKeyConfig INSTANCE = new EmptyKeyConfig();

    private EmptyKeyConfig() {
        // Enforce a single instance
    }

    @Override
    public Collection getDependentFiles() {
        return Collections.emptyList();
    }

    @Override
    public X509ExtendedKeyManager createKeyManager() {
        return null;
    }

    @Override
    public String toString() {
        return "empty-key-config";
    }
}