question: public void writeBundleStream ( BundleStreamSource source , WritableByteChannel output ) throws IOException { ByteBuffer buffer = ByteBuffer . allocateDirect ( INITIAL_BUFFER ) ; DBIDVar var = DBIDUtil . newVar ( ) ; ByteBufferSerializer < ? > [ ] serializers = null ; loop : while ( true ) { BundleStreamSource . Event ev = source . nextEvent ( ) ; switch ( ev ) { case NEXT_OBJECT : if ( serializers == null ) { serializers = writeHeader ( source , buffer , output ) ; } if ( serializers [ 0 ] != null ) { if ( ! source . assignDBID ( var ) ) { throw new AbortException ( "An object did not have an DBID assigned." ) ; } DBID id = DBIDUtil . deref ( var ) ; @ SuppressWarnings ( "unchecked" ) ByteBufferSerializer < DBID > ser = ( ByteBufferSerializer < DBID > ) serializers [ 0 ] ; int size = ser . getByteSize ( id ) ; buffer = ensureBuffer ( size , buffer , output ) ; ser . toByteBuffer ( buffer , id ) ; } for ( int i = 1 , j = 0 ; i < serializers . length ; ++ i , ++ j ) { @ SuppressWarnings ( "unchecked" ) ByteBufferSerializer < Object > ser = ( ByteBufferSerializer < Object > ) serializers [ i ] ; int size = ser . getByteSize ( source . data ( j ) ) ; buffer = ensureBuffer ( size , buffer , output ) ; ser . toByteBuffer ( buffer , source . data ( j ) ) ; } break ; case META_CHANGED : if ( serializers != null ) { throw new AbortException ( "Meta changes are not supported, once the block header has been written." ) ; } break ; case END_OF_STREAM : break loop ; default : LOG . warning ( "Unknown bundle stream event. API inconsistent? " + ev ) ; break ; } } if ( buffer . position ( ) > 0 ) { flushBuffer ( buffer , output ) ; } }
target:  Write a bundle stream to a file output channel.