azkaban.crypto.Version.java Source code

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Here is the source code for azkaban.crypto.Version.java

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/*
 * Copyright (C) 2016 LinkedIn Corp. All rights reserved.
 *
 * 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.
 */
package azkaban.crypto;

import java.util.Collections;
import java.util.List;
import java.util.Map;

import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableMap.Builder;
import com.google.common.collect.Lists;

public enum Version {
    V1_0("1.0"), V1_1("1.1");

    private static final Map<String, Version> REVERSE_ENTRIES;
    static {
        Builder<String, Version> builder = ImmutableMap.builder();
        for (Version version : Version.values()) {
            builder.put(version._ver, version);
        }
        REVERSE_ENTRIES = builder.build();
    }

    private final String _ver;

    private Version(String ver) {
        this._ver = ver;
    }

    /**
     * @return Version string
     */
    public String versionStr() {
        return _ver;
    }

    /**
     * Provides Version enum based on version String
     * @param ver Version String
     * @return
     */
    public static Version fromVerString(String ver) {
        Version result = REVERSE_ENTRIES.get(ver);
        Preconditions.checkNotNull(ver, "Invalid version " + ver);
        return result;
    }

    /**
     * @return Naturally ordered list of version String.
     */
    public static List<String> versionStrings() {
        List<String> versions = Lists.newArrayList(REVERSE_ENTRIES.keySet());
        Collections.sort(versions);
        return versions;
    }
}