How to use org.apache.maven.index.context

public IndexSearcher acquireIndexSearcher()
  throws IOException
{
  final NexusIndexMultiReader mr = new NexusIndexMultiReader( getMembers() );
  return new NexusIndexMultiSearcher( mr );
}

public int getSize()
  throws IOException
{
  int size = 0;
  for ( IndexingContext ctx : getMembers() )
  {
    size += ctx.getSize();
  }
  return size;
}

public void updateTimestamp( boolean save, Date timestamp )
  throws IOException
{
  this.timestamp = timestamp;
  if ( save )
  {
    IndexUtils.updateTimestamp( indexDirectory, getTimestamp() );
  }
}

public synchronized void replace( Directory directory )
  throws IOException
{
  final Date ts = IndexUtils.getTimestamp( directory );
  closeReaders();
  deleteIndexFiles( false );
  IndexUtils.copyDirectory( directory, indexDirectory );
  openAndWarmup();
  // reclaim the index as mine
  storeDescriptor();
  rebuildGroups();
  updateTimestamp( true, ts );
  optimize();
}

public IndexingContext addMergedIndexingContext( String id, String repositoryId, File repository,
  Directory indexDirectory, boolean searchable,
  Collection<IndexingContext> contexts )
  throws IOException
{
  IndexingContext context =
    new MergedIndexingContext( id, repositoryId, repository, indexDirectory, searchable,
                  new StaticContextMemberProvider( contexts ) );
  indexingContexts.put( context.getId(), context );
  return context;
}

public void closeIndexingContext( IndexingContext context, boolean deleteFiles )
  throws IOException
{
  context.close( deleteFiles );
}

public synchronized void setRootGroups( Collection<String> groups )
  throws IOException
{
  setGroups( groups, ArtifactInfo.ROOT_GROUPS, ArtifactInfo.ROOT_GROUPS_VALUE, ArtifactInfo.ROOT_GROUPS_LIST );
  commit();
}

public void updateTimestamp()
  throws IOException
{
  updateTimestamp( false );
}

public synchronized void merge( Directory directory )
  throws IOException
{
  merge( directory, null );
}

/**
 * Returns new IndexWriterConfig instance
 * 
 * @since 5.1
 */
protected IndexWriterConfig getWriterConfig()
{
  return NexusIndexWriter.defaultConfig();
}

public IndexingContext createMergedIndexingContext( String id, String repositoryId, File repository,
                          File indexDirectory, boolean searchable,
                          ContextMemberProvider membersProvider )
  throws IOException
{
  IndexingContext context =
    new MergedIndexingContext( id, repositoryId, repository, indexDirectory, searchable, membersProvider );
  return context;
}

public IndexingContext addMergedIndexingContext( String id, String repositoryId, File repository,
  Directory indexDirectory, boolean searchable,
  Collection<IndexingContext> contexts )
  throws IOException
{
  IndexingContext context =
    new MergedIndexingContext( id, repositoryId, repository, indexDirectory, searchable,
                  new StaticContextMemberProvider( contexts ) );
  indexingContexts.put( context.getId(), context );
  return context;
}

public IndexSearcher acquireIndexSearcher()
  throws IOException
{
  final NexusIndexMultiReader mr = new NexusIndexMultiReader( getMembers() );
  return new NexusIndexMultiSearcher( mr );
}

public int getSize()
  throws IOException
{
  int size = 0;
  for ( IndexingContext ctx : getMembers() )
  {
    size += ctx.getSize();
  }
  return size;
}

public void updateTimestamp( boolean save, Date timestamp )
  throws IOException
{
  this.timestamp = timestamp;
  if ( save )
  {
    IndexUtils.updateTimestamp( indexDirectory, getTimestamp() );
  }
}

public synchronized void merge( Directory directory )
  throws IOException
{
  merge( directory, null );
}

public IndexingContext addMergedIndexingContext( String id, String repositoryId, File repository,
  Directory indexDirectory, boolean searchable,
  Collection<IndexingContext> contexts )
  throws IOException
{
  IndexingContext context =
    new MergedIndexingContext( id, repositoryId, repository, indexDirectory, searchable,
                  new StaticContextMemberProvider( contexts ) );
  indexingContexts.put( context.getId(), context );
  return context;
}

public IndexSearcher acquireIndexSearcher()
  throws IOException
{
  final NexusIndexMultiReader mr = new NexusIndexMultiReader( getMembers() );
  return new NexusIndexMultiSearcher( mr );
}

public int getSize()
  throws IOException
{
  int size = 0;
  for ( IndexingContext ctx : getMembers() )
  {
    size += ctx.getSize();
  }
  return size;
}

public void updateTimestamp( boolean save, Date timestamp )
  throws IOException
{
  this.timestamp = timestamp;
  if ( save )
  {
    IndexUtils.updateTimestamp( indexDirectory, getTimestamp() );
  }
}