Ajout sortie

 package org.legrog.recommendation.postprocess;
 
 import org.apache.commons.csv.CSVFormat;
+import org.apache.commons.csv.CSVPrinter;
 import org.apache.commons.csv.CSVRecord;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -12,6 +13,7 @@ import org.springframework.stereotype.Component;
 import java.io.*;
 import java.util.List;
 import java.util.Properties;
+import java.util.Set;
 import java.util.stream.Collectors;
 import java.util.stream.StreamSupport;
 
@@ -33,6 +35,9 @@ public class PostprocessingRunner implements ApplicationRunner {
     @Value("${recommandations.filename}")
     private String recommandationsFilename;
 
+    @Value("${coverage.filename}")
+    private String coverageFilename;
+
     private Logger logger = LoggerFactory.getLogger(getClass());
     private String sampleFilename;
 
@@ -47,10 +52,23 @@ public class PostprocessingRunner implements ApplicationRunner {
         PostprocessingExpert expert = new PostprocessingExpert(samples, recommendations);
         PostprocessingCoverage coverage = expert.getCoverage();
 
+        writeCsvCoverage(coverage, dataDir, coverageFilename);
         //todo write coverage in a file to be read by user
         //...
     }
 
+    private void writeCsvCoverage(PostprocessingCoverage coverage, String dataDir, String coverageFilename) throws PostprocessingException {
+        try {
+            CSVPrinter csvPrinter = new CSVPrinter(new FileWriter(new File(dataDir, coverageFilename)),
+                    CSVFormat.TDF.withHeader("c1 (item)", "c2 (item-user)", "c3 (item#)"));
+            csvPrinter.printRecord(coverage.getC1(), coverage.getC2(), coverage.getC3());
+            csvPrinter.close();
+        } catch (IOException e) {
+            throw new PostprocessingException("Can't write coverage file " + dataDir + coverageFilename, e);
+        }
+
+    }
+
     /**
      * read csv (TDF) file and map it to a list of PostprocessingSample
      *