package com.simpligility.maven.plugins.android.phase01generatesources;
   
   import java.util.Arrays;
   import java.util.Collection;
   import java.util.HashMap;
   import java.util.HashSet;
   import java.util.Map;
   import java.util.Set;
   import java.util.TreeMap;
  
  /**
   * Looks for duplicate layout files across Android resource packages.
   */
  final class ConflictingLayoutDetector
  {
      private Map<String, Collection<String>> map = new HashMap<String, Collection<String>>();
  
      public void addLayoutFiles( String packageName, String[] layoutFiles )
      {
          map.put( packageName, Arrays.asList( layoutFiles ) );
      }
  
      public Collection<ConflictingLayout> getConflictingLayouts()
      {
          final Map<String, ConflictingLayout> result = new TreeMap<String, ConflictingLayout>();
          for ( final String entryA : map.keySet() )
          {
              for ( final String entryB : map.keySet() )
              {
                  if ( entryA.equals( entryB ) )
                  {
                      continue;
                  }
  
                  // Find any layout files that are in both packages.
                  final Set<String> tmp = new HashSet<String>();
                  tmp.addAll( map.get( entryA ) );
                  tmp.retainAll( map.get( entryB ) );
  
                  for ( final String layoutFile : tmp )
                  {
                      if ( !result.containsKey( layoutFile ) )
                      {
                          result.put( layoutFile, new ConflictingLayout( layoutFile ) );
                      }
                      final ConflictingLayout layout = result.get( layoutFile );
                      layout.addPackageName( entryA );
                      layout.addPackageName( entryB );
                  }
              }
          }
  
          return result.values();
      }
  }