/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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.
 */
package org.apache.hadoop.hdfs.server.datanode;

import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.*;
import org.junit.Test;

import static junit.framework.Assert.fail;
import static org.hamcrest.core.Is.is;
import static org.junit.Assert.assertThat;


/**
 * Test enumerations in TestHdfsServerConstants.
 */
public class TestHdfsServerConstants {

  /**
   * Verify that parsing a StartupOption string gives the expected results.
   * If a RollingUpgradeStartupOption is specified than it is also checked.
   *
   * @param value
   * @param expectedOption
   * @param expectedRollupOption optional, may be null.
   */
  private static void verifyStartupOptionResult(String value,
      StartupOption expectedOption,
      RollingUpgradeStartupOption expectedRollupOption) {

    StartupOption option = StartupOption.getEnum(value);
    assertThat(option, is(expectedOption));

    if (expectedRollupOption != null) {
      assertThat(option.getRollingUpgradeStartupOption(), is(expectedRollupOption));
    }
  }

  /**
   * Test that we can parse a StartupOption string without the optional
   * RollingUpgradeStartupOption.
   */
  @Test
  public void testStartupOptionParsing() {
    verifyStartupOptionResult("FORMAT", StartupOption.FORMAT, null);
    verifyStartupOptionResult("REGULAR", StartupOption.REGULAR, null);
    verifyStartupOptionResult("CHECKPOINT", StartupOption.CHECKPOINT, null);
    verifyStartupOptionResult("UPGRADE", StartupOption.UPGRADE, null);
    verifyStartupOptionResult("ROLLBACK", StartupOption.ROLLBACK, null);
    verifyStartupOptionResult("FINALIZE", StartupOption.FINALIZE, null);
    verifyStartupOptionResult("ROLLINGUPGRADE", StartupOption.ROLLINGUPGRADE, null);
    verifyStartupOptionResult("IMPORT", StartupOption.IMPORT, null);
    verifyStartupOptionResult("INITIALIZESHAREDEDITS", StartupOption.INITIALIZESHAREDEDITS, null);

    try {
      verifyStartupOptionResult("UNKNOWN(UNKNOWNOPTION)", StartupOption.FORMAT, null);
      fail("Failed to get expected IllegalArgumentException");
    } catch(IllegalArgumentException iae) {
      // Expected!
    }
  }

  /**
   * Test that we can parse a StartupOption string with a
   * RollingUpgradeStartupOption.
   */
  @Test
  public void testRollingUpgradeStartupOptionParsing() {
    verifyStartupOptionResult("ROLLINGUPGRADE(ROLLBACK)",
                              StartupOption.ROLLINGUPGRADE,
                              RollingUpgradeStartupOption.ROLLBACK);
    verifyStartupOptionResult("ROLLINGUPGRADE(DOWNGRADE)",
                              StartupOption.ROLLINGUPGRADE,
                              RollingUpgradeStartupOption.DOWNGRADE);

    try {
      verifyStartupOptionResult("ROLLINGUPGRADE(UNKNOWNOPTION)", StartupOption.ROLLINGUPGRADE, null);
      fail("Failed to get expected IllegalArgumentException");
    } catch(IllegalArgumentException iae) {
      // Expected!
    }
  }
}