content: /*
   * 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.ambari.server.checks;
  
  import org.apache.ambari.annotations.UpgradeCheckInfo;
  import org.apache.ambari.server.AmbariException;
  import org.apache.ambari.spi.upgrade.CheckQualification;
  import org.apache.ambari.spi.upgrade.UpgradeCheck;
  import org.apache.ambari.spi.upgrade.UpgradeCheckRequest;
  import org.apache.ambari.spi.upgrade.UpgradeType;
  import org.apache.commons.lang.ArrayUtils;
  
  /**
   * The {@link UpgradeTypeQualification} class is used to determine if the check
   * is required to run based on the {@link UpgradeType}. {@link UpgradeCheck}s
   * which do not specify any {@link UpgradeType}s will always return
   * {@code true}.
   */
   public final class UpgradeTypeQualification implements CheckQualification {
  
    private final Class<? extends UpgradeCheck> m_checkClass;
  
    /**
     * Constructor.
     *
     * @param checkClass
     *          the class of the check which is being considered for
     *          applicability.
     */
    public UpgradeTypeQualification(Class<? extends UpgradeCheck> checkClass) {
      m_checkClass = checkClass;
    }
  
    /**
     * {@inheritDoc}
     */
    @Override
    public boolean isApplicable(UpgradeCheckRequest request) throws AmbariException {
      UpgradeType upgradeType = request.getUpgradeType();
  
      UpgradeCheckInfo annotation = m_checkClass.getAnnotation(UpgradeCheckInfo.class);
      if (null == annotation) {
        return true;
      }
  
      // empty upgrade type or matching should return true
      UpgradeType[] upgradeTypes = annotation.required();
      return (ArrayUtils.isEmpty(upgradeTypes) || ArrayUtils.contains(upgradeTypes, upgradeType));
    }
  }