io.fabric8.kubernetes.client.utils.KubernetesVersionPriority Maven / Gradle / Ivy

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/**
 * Copyright (C) 2015 Red Hat, 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 io.fabric8.kubernetes.client.utils;

import io.fabric8.kubernetes.api.model.apiextensions.v1.CustomResourceDefinitionSpec;
import io.fabric8.kubernetes.api.model.apiextensions.v1.CustomResourceDefinitionVersion;

import java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;

import static io.fabric8.kubernetes.client.utils.KubernetesVersionFactory.Version;

/**
 * A util class that allows to deal with kubernetes versions.
 */
public class KubernetesVersionPriority {

    private KubernetesVersionPriority() {}

    /**
     * Returns the version with the highest priority for the given list of versions.
     *
     * @param versions the versions to pick the version with the highest priority from
     * @return the version with the highest priority
     *
     * @see CustomResourceDefinitionVersion#getName()
     * @see CustomResourceDefinitionSpec#getVersions()
     */
    public static String highestPriority(List versions) {
        List byPriority = getByPriority(versions);
        if (byPriority.isEmpty()) {
            return null;
        }
        return byPriority.get(0).getFull();
    }

    private static List getByPriority(List versions) {
        if (versions == null
                || versions.isEmpty()) {
            return Collections.emptyList();
        }
        return versions.stream()
                .map(KubernetesVersionFactory::create)
                .sorted(Collections.reverseOrder())
                .collect(Collectors.toList());
    }
}