Affects Version/s: 4.0.1
Environment:Java VM 1.8
Hi Spring Batch Team,
My name is Valentin, I am from Romania, I am Java Application Developer and I work for a project by using Spring Batch Core framework.
My project requires to create a batch which reads data from a simple flat file with TAB character as a field separator.
I use your new feature Spring Batch Core 4 class org.springframework.batch.item.file.builder.FlatFileItemReaderBuilder.DelimitedBuilder<T>. In my code, I want to set the TAB delimiter by the next sequence:
FlatFileItemReaderBuilder<MyData> flatFileItemReaderBuilder = new FlatFileItemReaderBuilder<>();
FlatFileItemReaderBuilder.DelimitedBuilder<MyData> flatFileItemReaderBuilderDelimited = flatFileItemReaderBuilder.delimited();
I've found on the field org.springframework.batch.item.file.builder.FlatFileItemReaderBuilder.DelimitedBuilder.delimiter. I've found that, in general, the delimiter is set by the method org.springframework.batch.item.file.builder.FlatFileItemReaderBuilder.DelimitedBuilder.build() at line 631, by the sequence:
Here the delimiter is checked against the method org.springframework.util.StringUtils.hasText(String). According to the hasText() method specification, "this method returns true if the String is not null, its length is greater than 0, and it contains at least one non-whitespace character." But in the case of TAB character, the string contains only one character (i.e. TAB character) which is a whitespace character, thus the condition is not valid, and the TAB character is not set as a delimiter.
Please correct me if I am wrong. As long as DelimitedLineTokenizer.DELIMITER_TAB constant exists, to exclude the TAB character was not an intention, and maybe this is a bug.
I think the class FlatFileItemReaderBuilder is a very good idea. I have already used this class for other separators. I am looking forward to your feedback.
P.S. For the moment, I have solved the problem by using the classic Spring Batch 3 style.