content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio.underfs.hdfs;
  
  import java.util.regex.Pattern;
  import javax.annotation.Nullable;
  
  /** The set of supported Hdfs versions. */
  public enum HdfsVersion {
    HADOOP_1_0("hadoop-1.0", "(hadoop-?1\\.0(\\.(\\d+))?|1\\.0(\\.(\\d+)(-.*)?)?)"),
    HADOOP_1_2("hadoop-1.2", "(hadoop-?1\\.2(\\.(\\d+))?|1\\.2(\\.(\\d+)(-.*)?)?)"),
    HADOOP_2_2("hadoop-2.2", "(hadoop-?2\\.2(\\.(\\d+))?|2\\.2(\\.(\\d+)(-.*)?)?)"),
    HADOOP_2_3("hadoop-2.3", "(hadoop-?2\\.3(\\.(\\d+))?|2\\.3(\\.(\\d+)(-.*)?)?)"),
    HADOOP_2_4("hadoop-2.4", "(hadoop-?2\\.4(\\.(\\d+))?|2\\.4(\\.(\\d+)(-.*)?)?)"),
    HADOOP_2_5("hadoop-2.5", "(hadoop-?2\\.5(\\.(\\d+))?|2\\.5(\\.(\\d+)(-.*)?)?)"),
    HADOOP_2_6("hadoop-2.6", "(hadoop-?2\\.6(\\.(\\d+))?|2\\.6(\\.(\\d+)(-.*)?)?)"),
    HADOOP_2_7("hadoop-2.7", "(hadoop-?2\\.7(\\.(\\d+))?|2\\.7(\\.(\\d+)(-.*)?)?)"),
    HADOOP_2_8("hadoop-2.8", "(hadoop-?2\\.8(\\.(\\d+))?|2\\.8(\\.(\\d+)(-.*)?)?)"),
    HADOOP_2_9("hadoop-2.9", "(hadoop-?2\\.9(\\.(\\d+))?|2\\.9(\\.(\\d+)(-.*)?)?)"),
    HADOOP_2_10("hadoop-2.10", "(hadoop-?2\\.10(\\.(\\d+))?|2\\.10(\\.(\\d+)(-.*)?)?)"),
    HADOOP_3_0("hadoop-3.0", "(hadoop-?3\\.0(\\.(\\d+))?|3\\.0(\\.(\\d+)(-.*)?)?)"),
    HADOOP_3_1("hadoop-3.1", "(hadoop-?3\\.1(\\.(\\d+))?|3\\.1(\\.(\\d+)(-.*)?)?)"),
    HADOOP_3_2("hadoop-3.2", "(hadoop-?3\\.2(\\.(\\d+))?|3\\.2(\\.(\\d+)(-.*)?)?)"),
    HADOOP_3_3("hadoop-3.3", "(hadoop-?3\\.3(\\.(\\d+))?|3\\.3(\\.(\\d+)(-.*)?)?)"),
    ;
  
    private final String mCanonicalVersion;
    private final Pattern mVersionPattern;
  
    /**
     * Constructs an instance of {@link HdfsVersion}.
     *
     * @param canonicalVersion the canonical version of an HDFS
     * @param versionPattern the regex pattern of version for an HDFS
     */
    HdfsVersion(String canonicalVersion, String versionPattern) {
      mCanonicalVersion = canonicalVersion;
      mVersionPattern = Pattern.compile(versionPattern);
    }
  
    /**
     * @param versionString given version string
     * @return the corresponding {@link HdfsVersion} instance
     */
    @Nullable
    public static HdfsVersion find(String versionString) {
      for (HdfsVersion version : HdfsVersion.values()) {
        if (version.mVersionPattern.matcher(versionString).matches()) {
          return version;
        }
      }
      return null;
    }
  
    /**
     * @param versionA base version
     * @param versionB version to compare
     * @return if the two versions match explicitly or by pattern
     */
    public static boolean matches(String versionA, String versionB) {
      if (versionA.equals(versionB)) {
        return true;
      }
      if (HdfsVersion.find(versionA) != null
          && HdfsVersion.find(versionA) == HdfsVersion.find(versionB)) {
        return true;
      }
      return false;
    }
  
    /**
     * @return the canonical version string
     */
    public String getCanonicalVersion() {
      return mCanonicalVersion;
    }
  }
  