How to use

compare

method

in

org.apache.cassandra.utils.ByteBufferUtil

if (ByteBufferUtil.compare(col.name(), CassandraUtils.documentMetaFieldBytes.array()) == 0)

private void testWriteLByteArray(int bufferSize) throws IOException {
 ByteBufferOutputStream sink = new ByteBufferOutputStream();
 byte[] written = new byte[bufferSize];
 new Random().nextBytes(written);
 sink.write(written);
 assertEquals(0, ByteBufferUtil.compare(sink.getByteBuffer(), written));
}

@Test
public void testWriteLargeByteBuffer() throws IOException {
 ByteBufferOutputStream sink = new ByteBufferOutputStream();
 byte[] written = new byte[32 * 1000];
 new Random().nextBytes(written);
 sink.write(ByteBuffer.wrap(written));
 assertEquals(0, ByteBufferUtil.compare(sink.getByteBuffer(), written));
}

@Test
public void testWriteByteArraySeveralSteps() throws IOException {
 ByteBufferOutputStream sink = new ByteBufferOutputStream();
 byte[] written = new byte[32 * ByteBufferOutputStream.INITIAL_BUFFER_SIZE];
 new Random().nextBytes(written);
 for(int i = 0; i < 32; i++) { 
  sink.write(written, i * ByteBufferOutputStream.INITIAL_BUFFER_SIZE, ByteBufferOutputStream.INITIAL_BUFFER_SIZE);      
 }
 assertEquals(0, ByteBufferUtil.compare(sink.getByteBuffer(), written));
}

/**
 * Get specific ColumnDef in column family meta data by column name
 * @param columnFamily - CfDef record
 * @param columnName   - column name represented as byte[]
 * @return ColumnDef   - found column definition
 */
private ColumnDef getColumnDefByName(CfDef columnFamily, ByteBuffer columnName)
{
  for (ColumnDef columnDef : columnFamily.getColumn_metadata())
  {
    byte[] currName = columnDef.getName();
    if (ByteBufferUtil.compare(currName, columnName) == 0)
    {
      return columnDef;
    }
  }
  return null;
}

/**
 * Converts column value into byte[] according to validation class
 * @param columnName - column name to which value belongs
 * @param columnFamilyName - column family name
 * @param columnValue - actual column value
 * @return value in byte array representation
 */
private ByteBuffer columnValueAsBytes(ByteBuffer columnName, String columnFamilyName, String columnValue)
{
  CfDef columnFamilyDef = getCfDef(columnFamilyName);
  AbstractType<?> defaultValidator = getFormatType(columnFamilyDef.default_validation_class);
  for (ColumnDef columnDefinition : columnFamilyDef.getColumn_metadata())
  {
    byte[] currentColumnName = columnDefinition.getName();
    if (ByteBufferUtil.compare(currentColumnName, columnName) == 0)
    {
      try
      {
        String validationClass = columnDefinition.getValidation_class();
        return getBytesAccordingToType(columnValue, getFormatType(validationClass));
      }
      catch (Exception e)
      {
        throw new RuntimeException(e);
      }
    }
  }
  return defaultValidator.fromString(columnValue);
}