file drop support

- Add a folder where you can drop Zip files which will then be
  extracted on the fly and ingsted.
- CsvReaderSettings now contain TagMatcher that are applied to the
  first line and can be used to extract additional tags.
- Update to jdk 16 so that we can have records.

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

@@ -1,12 +1,15 @@
 package org.lucares.pdbui;
 
 import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
 import java.util.EnumSet;
 import java.util.HashMap;
 import java.util.Iterator;
+import java.util.List;
 import java.util.Map;
 import java.util.function.Function;
 
+import org.lucares.pdbui.domain.TagMatcher;
 import org.lucares.utils.Preconditions;
 
 public final class CsvReaderSettings {
@@ -166,6 +169,8 @@ public final class CsvReaderSettings {
 
     private String comment = "#";
 
+    private List<TagMatcher> firstLineMatcher = new ArrayList<>();
+
     public CsvReaderSettings() {
         this("@timestamp", "duration", ",", new ColumnDefinitions());
     }
@@ -238,6 +243,10 @@ public final class CsvReaderSettings {
         additionalTags.put(field, value);
     }
 
+    public void putAdditionalTag(final Map<String, String> additionalTags) {
+        additionalTags.putAll(additionalTags);
+    }
+
     public Map<String, String> getAdditionalTags() {
         return Map.copyOf(additionalTags);
     }
@@ -254,4 +263,52 @@ public final class CsvReaderSettings {
         this.columnDefinitions = columnDefinitions;
     }
 
+    public List<TagMatcher> getFirstLineMatcher() {
+        return firstLineMatcher;
+    }
+
+    public void setFirstLineMatcher(final List<TagMatcher> firstLineMatcher) {
+        this.firstLineMatcher = firstLineMatcher;
+    }
+
+    @Override
+    public String toString() {
+        final StringBuilder builder = new StringBuilder();
+        if (separator != null) {
+            builder.append("\nseparator=");
+            builder.append(separator);
+            builder.append(", ");
+        }
+        if (columnDefinitions != null) {
+            builder.append("\ncolumnDefinitions=");
+            builder.append(columnDefinitions);
+            builder.append(", ");
+        }
+        if (additionalTags != null) {
+            builder.append("\nadditionalTags=");
+            builder.append(additionalTags);
+            builder.append(", ");
+        }
+        if (timeColumn != null) {
+            builder.append("\ntimeColumn=");
+            builder.append(timeColumn);
+            builder.append(", ");
+        }
+        if (valueColumn != null) {
+            builder.append("\nvalueColumn=");
+            builder.append(valueColumn);
+            builder.append(", ");
+        }
+        if (firstLineMatcher != null) {
+            builder.append("\nfirstLineMatcher=");
+            builder.append(firstLineMatcher);
+            builder.append(", ");
+        }
+        if (comment != null) {
+            builder.append("\ncomment=");
+            builder.append(comment);
+        }
+        return builder.toString();
+    }
+
 }