package org.codehaus.mojo.clirr;
   
   /*
    * Copyright 2006 The Codehaus
    *
    * 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.
   */
  
  import net.sf.clirr.core.ApiDifference;
  import net.sf.clirr.core.DiffListenerAdapter;
  import net.sf.clirr.core.Severity;
  
  import java.util.Collections;
  import java.util.Comparator;
  import java.util.HashMap;
  import java.util.LinkedList;
  import java.util.List;
  import java.util.Map;
  
  /**
   * Listen to the Clirr events.
   *
   * @author <a href="mailto:brett@apache.org">Brett Porter</a>
   */
  public class ClirrDiffListener
      extends DiffListenerAdapter
      implements MojoDiffListener
  {
      /**
       * The list of differences that occurred.
       */
      private List<ApiDifference> apiDifferences = new LinkedList<ApiDifference>();
      /**
       * The list of ignored differences that occurred.
       */
      private Map<Difference, List<ApiDifference>> ignoredApiDifferences = new HashMap<Difference, List<ApiDifference>>();
  
      /**
       * The number messages for each severity.
       */
      private Map<Severity, Integer> counts = new HashMap<Severity, Integer>( 3 );
  
      @Override
      public void reportDiff( ApiDifference apiDifference )
      {
          incrementCount( apiDifference.getMaximumSeverity(), counts );
  
          apiDifferences.add( apiDifference );
      }
  
      public void reportIgnoredDiff( ApiDifference ignoredDiff, Difference reason )
      {
          List<ApiDifference> diffs = ignoredApiDifferences.get( reason );
          if ( diffs == null ) {
              diffs = new LinkedList<ApiDifference>();
              ignoredApiDifferences.put( reason, diffs );
          }
          diffs.add( ignoredDiff );
      }
  
      @Override
      public void stop()
      {
          Collections.sort( apiDifferences, new Comparator<ApiDifference>()
          {
              public int compare( ApiDifference d1, ApiDifference d2 )
              {
                  // compare maximum severities - order highest to lowest.
                  return d2.getMaximumSeverity().compareTo( d1.getMaximumSeverity() );
              }
          } );
      }
  
      private void incrementCount( Severity sev, Map<Severity, Integer> counts )
      {
          if ( sev != null )
          {
              int count = getCount( counts, sev );
              counts.put( sev, count + 1 );
          }
      }
  
      private int getCount( Map<Severity, Integer> counts, Severity sev )
      {
          Integer count = counts.get( sev );
          if ( count == null )
          {
              count = 0;
          }
         return count.intValue();
     }
 
     public List<ApiDifference> getApiDifferences()
     {
         return Collections.unmodifiableList( apiDifferences );
     }
 
     public Map<Difference, List<ApiDifference>> getIgnoredApiDifferences()
     {
       return Collections.unmodifiableMap( ignoredApiDifferences);
     }
 
     public int getSeverityCount( Severity severity )
     {
         return getCount( counts, severity );
     }
 
 }