branch-1.2/ambari-server/src/main/java/org/apache/ambari/server/controller/internal/AbstractPropertyProvider.java

/**
 * 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.controller.internal;

import org.apache.ambari.server.controller.spi.PropertyProvider;
import org.apache.ambari.server.controller.utilities.PropertyHelper;

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

/**
 *  Abstract property provider implementation.
 */
public abstract class AbstractPropertyProvider extends BaseProvider implements PropertyProvider {

  /**
   * The property/metric information for this provider keyed by component name / property id.
   */
  private final Map<String, Map<String, PropertyInfo>> componentMetrics;


  // ----- Constructors ------------------------------------------------------

  /**
   * Construct a provider.
   *
   * @param componentMetrics map of metrics for this provider
   */
  public AbstractPropertyProvider(Map<String, Map<String, PropertyInfo>> componentMetrics) {
    super(PropertyHelper.getPropertyIds(componentMetrics));
    this.componentMetrics = componentMetrics;
  }


  // ----- accessors ---------------------------------------------------------

  /**
   * Get the map of metrics for this provider.
   *
   * @return the map of metric / property info.
   */
  public Map<String, Map<String, PropertyInfo>> getComponentMetrics() {
    return componentMetrics;
  }


  // ----- helper methods ----------------------------------------------------

  /**
   * Get a map of metric / property info based on the given component name and property id.
   * Note that the property id may map to multiple metrics if the property id is a category.
   *
   * @param componentName  the component name
   * @param propertyId     the property id; may be a category
   *
   * @return a map of metrics
   */
  protected Map<String, PropertyInfo> getPropertyInfoMap(String componentName, String propertyId) {
    Map<String, PropertyInfo> componentMetricMap = componentMetrics.get(componentName);
    if (componentMetricMap == null) {
      return Collections.emptyMap();
    }

    PropertyInfo propertyInfo = componentMetricMap.get(propertyId);
    if (propertyInfo != null) {
      return Collections.singletonMap(propertyId, propertyInfo);
    }

    if (!propertyId.endsWith("/")){
      propertyId += "/";
    }
    Map<String, PropertyInfo> propertyInfoMap = new HashMap<String, PropertyInfo>();
    for (Map.Entry<String, PropertyInfo> entry : componentMetricMap.entrySet()) {
      if (entry.getKey().startsWith(propertyId)) {
        propertyInfoMap.put(entry.getKey(), entry.getValue());
      }
    }
    return propertyInfoMap;
  }
}