question: public static String encodeECC200 ( String codewords , SymbolInfo symbolInfo ) { if ( codewords . length ( ) != symbolInfo . getDataCapacity ( ) ) { throw new IllegalArgumentException ( "The number of codewords does not match the selected symbol" ) ; } StringBuilder sb = new StringBuilder ( symbolInfo . getDataCapacity ( ) + symbolInfo . getErrorCodewords ( ) ) ; sb . append ( codewords ) ; int blockCount = symbolInfo . getInterleavedBlockCount ( ) ; if ( blockCount == 1 ) { String ecc = createECCBlock ( codewords , symbolInfo . getErrorCodewords ( ) ) ; sb . append ( ecc ) ; } else { sb . setLength ( sb . capacity ( ) ) ; int [ ] dataSizes = new int [ blockCount ] ; int [ ] errorSizes = new int [ blockCount ] ; int [ ] startPos = new int [ blockCount ] ; for ( int i = 0 ; i < blockCount ; i ++ ) { dataSizes [ i ] = symbolInfo . getDataLengthForInterleavedBlock ( i + 1 ) ; errorSizes [ i ] = symbolInfo . getErrorLengthForInterleavedBlock ( i + 1 ) ; startPos [ i ] = 0 ; if ( i > 0 ) { startPos [ i ] = startPos [ i - 1 ] + dataSizes [ i ] ; } } for ( int block = 0 ; block < blockCount ; block ++ ) { StringBuilder temp = new StringBuilder ( dataSizes [ block ] ) ; for ( int d = block ; d < symbolInfo . getDataCapacity ( ) ; d += blockCount ) { temp . append ( codewords . charAt ( d ) ) ; } String ecc = createECCBlock ( temp . toString ( ) , errorSizes [ block ] ) ; int pos = 0 ; for ( int e = block ; e < errorSizes [ block ] * blockCount ; e += blockCount ) { sb . setCharAt ( symbolInfo . getDataCapacity ( ) + e , ecc . charAt ( pos ++ ) ) ; } } } return sb . toString ( ) ; }
target:  Creates the ECC200 error correction for an encoded message.