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.stack.upgrade;
  
  import java.util.Map;
  
  import javax.xml.bind.annotation.XmlAccessType;
  import javax.xml.bind.annotation.XmlAccessorType;
  import javax.xml.bind.annotation.XmlAttribute;
  import javax.xml.bind.annotation.XmlEnum;
  import javax.xml.bind.annotation.XmlEnumValue;
  import javax.xml.bind.annotation.XmlType;
  
  import org.apache.ambari.server.stack.upgrade.orchestrate.UpgradeContext;
  import org.apache.ambari.server.state.Cluster;
  import org.apache.ambari.server.state.Config;
  import org.apache.commons.lang.StringUtils;
  
  import com.google.common.base.MoreObjects;
  
  /**
   * The {@link ConfigurationCondition} class is used to represent a condition on
   * a property.
   */
  @XmlType(name = "config")
  @XmlAccessorType(XmlAccessType.FIELD)
  public final class ConfigurationCondition extends Condition {
  
    /**
     * The type of comparison to make.
     */
    @XmlEnum
    public enum ComparisonType {
  
      /**
       * Equals comparison.
       */
      @XmlEnumValue("equals")
      EQUALS,
  
      /**
       * Not equals comparison.
       */
      @XmlEnumValue("not-equals")
      NOT_EQUALS,
  
      /**
       * String contains.
       */
      @XmlEnumValue("contains")
      CONTAINS,
  
      /**
       * Does not contain.
       */
      @XmlEnumValue("not-contains")
      NOT_CONTAINS,
  
      /**
       * Exists with any value.
       */
      @XmlEnumValue("exists")
      EXISTS,
  
      /**
       * Does not exist.
       */
      @XmlEnumValue("not-exists")
      NOT_EXISTS;
    }
  
    /**
     * The configuration type, such as {@code hdfs-site}.
     */
    @XmlAttribute(name = "type")
    public String type;
  
    /**
     * The configuration property key.
     */
    @XmlAttribute(name = "property")
    public String property;
  
    /**
     * The value to compare against; only valid if comparison type is in (=, !=, contains, !contains).
     */
    @XmlAttribute(name = "value")
    public String value;
  
    /**
     * The value to return if comparison type is in (=, !=, contains, !contains) and the config is missing.
     */
    @XmlAttribute(name = "return_value_if_config_missing")
    public boolean returnValueIfConfigMissing;
  
    /**
     * The type of comparison to make.
     */
    @XmlAttribute(name = "comparison")
    public ComparisonType comparisonType;
  
    /**
     * {@inheritDoc}
     */
    @Override
    public String toString() {
      return MoreObjects.toStringHelper(this).add("type", type).add("property", property).add("value",
          value).add("comparison", comparisonType).omitNullValues().toString();
    }
  
    /**
     * {@inheritDoc}
     */
    @Override
    public boolean isSatisfied(UpgradeContext upgradeContext) {
      Cluster cluster = upgradeContext.getCluster();
  
      boolean propertyExists = false;
      Config config = cluster.getDesiredConfigByType(type);
      Map<String, String> properties = null;
      if (null != config) {
        properties = config.getProperties();
        if (properties.containsKey(property)) {
          propertyExists = true;
        }
      }
  
      if (comparisonType == ComparisonType.EXISTS) {
        return propertyExists;
      }
      if (comparisonType == ComparisonType.NOT_EXISTS) {
        return !propertyExists;
      }
  
      // If property doesn't exist, we cannot make any claims using =, !=, contains !contains.
      // Therefore, check if the Upgrade Pack provided a default return value when the config is missing.
      if (!propertyExists) {
        return returnValueIfConfigMissing;
      }
  
      String propertyValue = properties.get(property);
      switch (comparisonType) {
        case EQUALS:
          return StringUtils.equals(propertyValue, value);
        case NOT_EQUALS:
          return !StringUtils.equals(propertyValue, value);
        case CONTAINS:
          return StringUtils.contains(propertyValue, value);
        case NOT_CONTAINS:
          return !StringUtils.contains(propertyValue, value);
        default:
          return false;
      }
    }
  }
  
  