private long dumpBtreeHeader()

in mavibot/src/main/java/org/apache/directory/mavibot/btree/RecordManager.java [3469:3575]
62 lines of code
6 McCabe index (conditional complexity)

    private long dumpBtreeHeader( long btreeOffset ) throws EndOfFileExceededException, IOException
    {
        // First read the B-tree header
        PageIO[] pageIos = readPageIOs( btreeOffset, Long.MAX_VALUE );

        long dataPos = 0L;

        // The B-tree current revision
        long revision = readLong( pageIos, dataPos );
        dataPos += LONG_SIZE;

        // The nb elems in the tree
        long nbElems = readLong( pageIos, dataPos );
        dataPos += LONG_SIZE;

        // The B-tree rootPage offset
        long rootPageOffset = readLong( pageIos, dataPos );
        dataPos += LONG_SIZE;

        // The B-tree page size
        int btreePageSize = readInt( pageIos, dataPos );
        dataPos += INT_SIZE;

        // The tree name
        ByteBuffer btreeNameBytes = readBytes( pageIos, dataPos );
        dataPos += INT_SIZE + btreeNameBytes.limit();
        String btreeName = Strings.utf8ToString( btreeNameBytes );

        // The keySerializer FQCN
        ByteBuffer keySerializerBytes = readBytes( pageIos, dataPos );
        dataPos += INT_SIZE + keySerializerBytes.limit();

        String keySerializerFqcn = "";

        if ( keySerializerBytes != null )
        {
        keySerializerFqcn = Strings.utf8ToString( keySerializerBytes );
        }

        // The valueSerialier FQCN
        ByteBuffer valueSerializerBytes = readBytes( pageIos, dataPos );

        String valueSerializerFqcn = "";
        dataPos += INT_SIZE + valueSerializerBytes.limit();

        if ( valueSerializerBytes != null )
        {
        valueSerializerFqcn = Strings.utf8ToString( valueSerializerBytes );
        }

        // The B-tree allowDuplicates flag
        int allowDuplicates = readInt( pageIos, dataPos );
        boolean dupsAllowed = allowDuplicates != 0;

        dataPos += INT_SIZE;

        //        System.out.println( "\n  B-Tree " + btreeName );
        //        System.out.println( "  ------------------------- " );

        //        System.out.println( "    nbPageIOs[" + pageIos.length + "] = " + pageIoList );
        if ( LOG.isDebugEnabled() )
        {
            StringBuilder sb = new StringBuilder();
            boolean isFirst = true;

            for ( PageIO pageIo : pageIos )
            {
                if ( isFirst )
                {
                    isFirst = false;
                }
                else
                {
                    sb.append( ", " );
                }

                sb.append( "0x" ).append( Long.toHexString( pageIo.getOffset() ) );
            }

            String pageIoList = sb.toString();

            LOG.debug( "    PageIOs[{}] = {}", pageIos.length, pageIoList );

            //        System.out.println( "    dataSize = "+ pageIos[0].getSize() );
            LOG.debug( "    dataSize = {}", pageIos[0].getSize() );

            LOG.debug( "    B-tree '{}'", btreeName );
            LOG.debug( "    revision : {}", revision );
            LOG.debug( "    nbElems : {}", nbElems );
            LOG.debug( "    rootPageOffset : 0x{}", Long.toHexString( rootPageOffset ) );
            LOG.debug( "    B-tree page size : {}", btreePageSize );
            LOG.debug( "    keySerializer : '{}'", keySerializerFqcn );
            LOG.debug( "    valueSerializer : '{}'", valueSerializerFqcn );
            LOG.debug( "    dups allowed : {}", dupsAllowed );
            //
            //        System.out.println( "    B-tree '" + btreeName + "'" );
            //        System.out.println( "    revision : " + revision );
            //        System.out.println( "    nbElems : " + nbElems );
            //        System.out.println( "    rootPageOffset : 0x" + Long.toHexString( rootPageOffset ) );
            //        System.out.println( "    B-tree page size : " + btreePageSize );
            //        System.out.println( "    keySerializer : " + keySerializerFqcn );
            //        System.out.println( "    valueSerializer : " + valueSerializerFqcn );
            //        System.out.println( "    dups allowed : " + dupsAllowed );
        }

        return rootPageOffset;
    }