grouping mail archive by year-month

src/main/java/de/srsoftware/widerhall/data/Database.java

@@ -143,11 +143,14 @@ public class Database {
          * finalize sql, save sql and arguments as compiled request
          * @return
          */
-        public CompiledRequest compile(){
+        public CompiledRequest compile(Object ...additionalArgs){
             var args = new ArrayList<>();
             applyValues(args);
             applyConditions(args);
             applySorting();
+            if (additionalArgs != null) {
+                for (Object arg : additionalArgs) args.add(arg);
+            }
             return new CompiledRequest(sql.toString(),args);
         }
 

src/main/java/de/srsoftware/widerhall/data/Post.java

@@ -12,12 +12,11 @@ import java.io.File;
 import java.io.IOException;
 import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
-import java.sql.Array;
 import java.sql.ResultSet;
 import java.sql.SQLException;
+import java.sql.Timestamp;
 import java.util.ArrayList;
 import java.util.HashMap;
-import java.util.HashSet;
 import java.util.Map;
 
 import static de.srsoftware.widerhall.Constants.*;
@@ -98,8 +97,14 @@ public class Post {
         return new File(filename);
     }
 
-    public static ArrayList<Post> find(MailingList list) throws SQLException {
-        var rs = Database.open().select(TABLE_NAME).where(LIST,list.email()).sort(DATE).compile().exec();
+    public static ArrayList<Post> find(MailingList list, String month) throws SQLException {
+        var rs = Database.open()
+                .select(TABLE_NAME,"*","strftime('%Y-%m',date/1000,'unixepoch') as month")
+                .where(LIST,list.email())
+                .where(MONTH,month)
+                .sort(DATE)
+                .compile()
+                .exec();
         try {
             var result = new ArrayList<Post>();
             while (rs.next()) result.add(Post.from(rs));
@@ -160,7 +165,7 @@ public class Post {
                 LIST,list.name(),
                 FROM_NAME,fromName,
                 SUBJECT,Util.dropEmail(subject),
-                DATE,timestamp);
+                DATE, new Timestamp(timestamp).toString());
     }
 
     private Post save() throws SQLException {
@@ -168,6 +173,15 @@ public class Post {
         return this;
     }
 
+    public static HashMap<String, Object> summarize(MailingList list) throws SQLException {
+        var sql = new StringBuilder("SELECT count(*) as count,strftime('%Y-%m',date/1000,'unixepoch') as month FROM Posts WHERE list = ? GROUP BY month ORDER BY month;");
+        var map = new HashMap<String,Object>();
+        var rs = Database.open().query(sql).compile(list.email()).exec();
+        while (rs.next()) map.put(rs.getString("month"),rs.getInt("count"));
+        rs.close();
+        return map;
+    }
+
     public long timestamp(){
         return timestamp;
     }