/super-csv/src/main/java/org/supercsv/cellprocessor/constraint/Unique.java
if ( !( encounteredElements.add( value) ) ) {   throw new SuperCsvConstraintViolationException( format( "duplicate value '%s' encountered", value) , context, this) ; }
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public Unique(final CellProcessor next) { super(next); } public Object execute(final Object value, final CsvContext context) { validateInputNotNull(value, context); if( !encounteredElements.add(value) ) { <extra_id_0> } return next.execute(value, context); } }