/*
    * 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.commons.monitoring.reporting.web.plugin.report.format;
  
  import org.apache.commons.monitoring.counters.Counter;
  
  /**
   * An enum to acces data from a Counter based on the property name. Can be used to avoid reflection on Counter
   * implementation when requesting data and undesirable exposure of internals.
   * <p/>
   * example :
   * <p/>
   * <pre>
   * String property = httpServletRequest.getParameter( &quot;property&quot; );
   *
   * Double data = MetricData.valueOf( property ).value( metric );
   * </pre>
   *
   * @author <a href="mailto:nicolas@apache.org">Nicolas De Loof</a>
   */
  public enum MetricData {
      Hits {
          @Override
          public double value(final Counter counter) {
              return counter.getHits();
          }
  
          @Override
          public boolean isTime() {
              return false;
          }
      },
      Max {
          @Override
          public double value(final Counter counter) {
              return counter.getMax();
          }
  
          @Override
          public boolean isTime() {
              return true;
          }
      },
      Mean {
          @Override
          public double value(final Counter counter) {
              return counter.getMean();
          }
  
          @Override
          public boolean isTime() {
              return true;
          }
      },
      Min {
          @Override
          public double value(final Counter counter) {
              return counter.getMin();
          }
  
          @Override
          public boolean isTime() {
              return true;
          }
      },
      StandardDeviation {
          @Override
          public double value(final Counter counter) {
              return counter.getStandardDeviation();
          }
  
          @Override
          public boolean isTime() {
              return false;
          }
      },
      Sum {
          @Override
          public double value(final Counter counter) {
              return counter.getSum();
          }
  
          @Override
          public boolean isTime() {
             return true;
         }
     },
     SumOfLogs {
         @Override
         public double value(final Counter counter) {
             return counter.getSumOfLogs();
         }
 
         @Override
         public boolean isTime() {
             return false;
         }
     },
     SumOfSquares {
         @Override
         public double value(final Counter counter) {
             return counter.getSumOfSquares();
         }
 
         @Override
         public boolean isTime() {
             return false;
         }
     },
     Variance {
         @Override
         public double value(final Counter counter) {
             return counter.getVariance();
         }
 
         @Override
         public boolean isTime() {
             return false;
         }
     },
     GeometricMean {
         @Override
         public double value(final Counter counter) {
             return counter.getGeometricMean();
         }
 
         @Override
         public boolean isTime() {
             return false;
         }
     },
     Value {
         @Override
         public double value(final Counter counter) {
             return counter.getSum();
         }
 
         @Override
         public boolean isTime() {
             return true;
         }
     },
     Concurrency {
         @Override
         public double value(final Counter counter) {
             return counter.currentConcurrency().get();
         }
 
         @Override
         public boolean isTime() {
             return false;
         }
     },
     MaxConcurrency {
         @Override
         public double value(final Counter counter) {
             return counter.getMaxConcurrency();
         }
 
         @Override
         public boolean isTime() {
             return false;
         }
     };
 
     public abstract double value(Counter counter);
     public abstract boolean isTime();
 }