public static BTree compact()

in mavibot/src/main/java/org/apache/directory/mavibot/btree/BulkLoader.java [1373:1445]
58 lines of code
6 McCabe index (conditional complexity)

    public static BTree<?, ?> compact( BTree<?, ?> btree ) throws IOException, KeyNotFoundException
    {
        // First, create a new BTree which will contain all the elements
        InMemoryBTreeConfiguration configuration = new InMemoryBTreeConfiguration();
        configuration.setName( btree.getName() );
        configuration.setPageSize( btree.getPageSize() );
        configuration.setKeySerializer( btree.getKeySerializer() );
        configuration.setValueSerializer( btree.getValueSerializer() );
        configuration.setAllowDuplicates( btree.isAllowDuplicates() );
        configuration.setReadTimeOut( btree.getReadTimeOut() );
        configuration.setWriteBufferSize( btree.getWriteBufferSize() );

        File file = ( ( InMemoryBTree ) btree ).getFile();

        if ( file != null )
        {
            configuration.setFilePath( file.getPath() );
        }

        // Create a new Btree Builder
        InMemoryBTreeBuilder btreeBuilder = new InMemoryBTreeBuilder( configuration );

        // Create a cursor over the existing btree
        final TupleCursor cursor = btree.browse();

        // Create an iterator that will iterate the existing btree
        Iterator<Tuple> tupleItr = new Iterator<Tuple>()
        {
            @Override
            public Tuple next()
            {
                try
                {
                    return cursor.next();
                }
                catch ( EndOfFileExceededException e )
                {
                    return null;
                }
                catch ( IOException e )
                {
                    return null;
                }
            }


            @Override
            public boolean hasNext()
            {
                try
                {
                    return cursor.hasNext();
                }
                catch ( EndOfFileExceededException e )
                {
                    return false;
                }
                catch ( IOException e )
                {
                    return false;
                }
            }


            @Override
            public void remove()
            {
            }
        };

        // And finally, compact the btree
        return btreeBuilder.build( tupleItr );
    }