/**

  * Copyright 2005-2013 Dozer Project

  *

  * Licensed 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.dozer.stats;

 import org.apache.commons.lang3.builder.EqualsBuilder;

 import org.apache.commons.lang3.builder.ReflectionToStringBuilder;

 import org.apache.commons.lang3.builder.ToStringStyle;

 import java.util.HashSet;

 import java.util.Set;

 import java.util.concurrent.ConcurrentHashMap;

 import java.util.concurrent.ConcurrentMap;

 /**

  * Internal class that provides an interface to a single statistic. Holds all of the statistic entries for the

  * statistic. Only intended for internal use.

  *

  * @author tierney.matt

  * @author dmitry.buzdin

  */

 public class Statistic {

   private final StatisticType type;

   private final ConcurrentMap<Object, StatisticEntry> entriesMap = new ConcurrentHashMap<Object, StatisticEntry>();

   public Statistic(StatisticType type) {

     this.type = type;

   }

   public StatisticType getType() {

     return type;

   }

   public StatisticEntry increment(Object statisticEntryKey, long value) {

     if (statisticEntryKey == null) {

       throw new IllegalArgumentException("statistic entry key must be specified");

     }

     // Get the StatisticEntry object which contains the actual value.

     // If it doesn't already exist, create it so that it can be incremented

     StatisticEntry statisticEntry = entriesMap.get(statisticEntryKey);

     if (statisticEntry == null) {

       StatisticEntry newStatisticEntry = new StatisticEntry(statisticEntryKey);

       statisticEntry = entriesMap.putIfAbsent(statisticEntryKey, newStatisticEntry);

       if (statisticEntry == null) {

         statisticEntry = newStatisticEntry;

       }

     }

     // Increment the actual value

     statisticEntry.increment(value);

     return statisticEntry;

   }

   public void clear() {

     entriesMap.clear();

   }

   public Set<StatisticEntry> getEntries() {

     return new HashSet<StatisticEntry>(entriesMap.values());

   }

   public StatisticEntry getEntry(Object entryKey) {

     return entriesMap.get(entryKey);

   }

   public long getStatisticValue(Object entryKey) {

     StatisticEntry statisticEntry = entriesMap.get(entryKey);

     return statisticEntry != null ? statisticEntry.getValue() : 0;

   }

   @Override

   public boolean equals(Object object) {

     if ((this == object)) {

       return true;

     }

     if (!(object instanceof Statistic)) {

       return false;

     }

     Statistic entry = (Statistic) object;

     return new EqualsBuilder().append(this.getType(), entry.getType()).isEquals();

   }

   @Override

   public int hashCode() {

     return type.hashCode();

   }

   @Override

   public String toString() {

     return ReflectionToStringBuilder.toString(this, ToStringStyle.MULTI_LINE_STYLE);

   }

 }