make time column configurable

Adding the header of the time column to the
CsvReaderSettings. This is necessary to parse
arbitrary CSV files.

pdb-ui/src/main/java/org/lucares/pdbui/CsvReaderSettings.java

@@ -12,30 +12,45 @@ public class CsvReaderSettings {
 
     private Set<String> ignoreColumnNames = new HashSet<String>();
 
+    private String timeColumn;
+
     public CsvReaderSettings() {
         separator = ',';
+        timeColumn = "@timestamp";
     }
 
-    private CsvReaderSettings(final byte separator, final Collection<String> ignoreColumns) {
+    private CsvReaderSettings(final String timeColumn, final byte separator, final Collection<String> ignoreColumns) {
 
+        this.timeColumn = timeColumn;
         this.separator = separator;
         this.ignoreColumnNames.addAll(ignoreColumns);
     }
 
-    public static CsvReaderSettings create(final byte separator, final String... ignoreColumnNames) {
-        return new CsvReaderSettings(separator, List.of(ignoreColumnNames));
+    public static CsvReaderSettings create(final String timeColumn, final byte separator,
+            final String... ignoreColumnNames) {
+        return new CsvReaderSettings(timeColumn, separator, List.of(ignoreColumnNames));
     }
 
-    public static CsvReaderSettings create(final char separator, final String... ignoreColumnNames) {
-        return CsvReaderSettings.create(separator, List.of(ignoreColumnNames));
+    public static CsvReaderSettings create(final String timeColumn, final char separator,
+            final String... ignoreColumnNames) {
+        return CsvReaderSettings.create(timeColumn, separator, List.of(ignoreColumnNames));
     }
 
-    public static CsvReaderSettings create(final char separator, final Collection<String> ignoreColumnNames) {
+    public static CsvReaderSettings create(final String timeColumn, final char separator,
+            final Collection<String> ignoreColumnNames) {
         Preconditions.checkTrue(separator == (byte) separator,
                 "Only separators that fulfill separator == (byte)separator are supported. "
                         + "This restriction is because the parsing algorithm skips the overhead of "
                         + "translating bytes to characters.");
-        return new CsvReaderSettings((byte) separator, ignoreColumnNames);
+        return new CsvReaderSettings(timeColumn, (byte) separator, ignoreColumnNames);
+    }
+
+    public String getTimeColumn() {
+        return timeColumn;
+    }
+
+    public void setTimeColumn(final String timeColumn) {
+        this.timeColumn = timeColumn;
     }
 
     public byte getSeparator() {

pdb-ui/src/main/java/org/lucares/pdbui/CsvToEntryTransformer.java

@@ -42,7 +42,7 @@ class CsvToEntryTransformer {
 
         int[] columns = null;
         final byte[] buffer = new byte[4096 * 16];
-        final int keyTimestamp = Tags.STRING_COMPRESSOR.put("@timestamp");
+        final int keyTimestamp = Tags.STRING_COMPRESSOR.put(settings.getTimeColumn());
         final int keyDuration = Tags.STRING_COMPRESSOR.put("duration");
         final FastISODateParser dateParser = new FastISODateParser();
 

pdb-ui/src/main/java/org/lucares/pdbui/IngestionHandler.java

@@ -66,7 +66,7 @@ public final class IngestionHandler implements Callable<Void> {
         } else {
             in.reset();
             final CsvToEntryTransformer csvTransformer = new CsvToEntryTransformer(queue,
-                    CsvReaderSettings.create(','));
+                    CsvReaderSettings.create("@timestamp", ','));
             csvTransformer.readCSV(in);
         }
     }