Blogs: related tags

1 files changed, 51 insertions, 0 deletions

diff --git a/src/java/com/juick/http/www/Blogs.java b/src/java/com/juick/http/www/Blogs.java
index 4af75cd3..527009a1 100644
--- a/src/java/com/juick/http/www/Blogs.java
+++ b/src/java/com/juick/http/www/Blogs.java
@@ -42,6 +42,24 @@ import javax.servlet.http.HttpServletResponse;
  */
 public class Blogs {
 
+    private int relatedTagsStartMID = 0;
+
+    public Blogs(Connection sql) {
+        PreparedStatement stmt = null;
+        ResultSet rs = null;
+        try {
+            stmt = sql.prepareStatement("SELECT MIN(message_id) FROM messages WHERE ts>DATE_ADD(NOW(),INTERVAL -6 MONTH)");
+            rs = stmt.executeQuery();
+            if (rs.first()) {
+                relatedTagsStartMID = rs.getInt(1);
+            }
+        } catch (SQLException e) {
+            System.err.println(e);
+        } finally {
+            Utils.finishSQL(rs, stmt);
+        }
+    }
+
     protected void doGet(Connection sql, Connection sqlSearch, HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
         String paramTagStrQuery = request.getParameter("tag");
         if (paramTagStrQuery != null) {
@@ -218,6 +236,13 @@ public class Blogs {
 
             out.println("<div id=\"rcol\" class=\"abs\">");
             PageTemplates.pageYandexAd(out, visitor == null ? 2 : 3); // разный ID для залогиненых и нет
+            if (paramTag > 0 && relatedTagsStartMID > 0) {
+                String related = getRelatedTags(sql, paramTag, 10);
+                if (!related.isEmpty()) {
+                    out.println("<h3>Related tags:</h3>");
+                    out.println("<ul id=\"reltags\">" + related + "</ul>");
+                }
+            }
             out.println("</div>");
 
             out.println("</div>"); // topwrapper
@@ -277,4 +302,30 @@ public class Blogs {
 
         return ret;
     }
+
+    private String getRelatedTags(Connection sql, int tag_id, int cnt) {
+        String ret = "";
+
+        PreparedStatement stmt = null;
+        ResultSet rs = null;
+        try {
+            stmt = sql.prepareStatement("SELECT tags.name,COUNT(message_id) AS cnt FROM messages_tags INNER JOIN tags ON messages_tags.tag_id=tags.tag_id WHERE messages_tags.message_id>" + relatedTagsStartMID + " AND messages_tags.message_id IN (SELECT message_id FROM messages_tags WHERE tag_id=?) AND messages_tags.tag_id NOT IN (SELECT tag_id FROM tags_ignore) GROUP BY messages_tags.tag_id HAVING cnt>1 ORDER BY cnt DESC LIMIT 1,?");
+            stmt.setInt(1, tag_id);
+            stmt.setInt(2, cnt);
+            rs = stmt.executeQuery();
+            rs.beforeFirst();
+            while (rs.next()) {
+                try {
+                    ret += "<li><a href=\"/tag/" + URLEncoder.encode(rs.getString(1), "UTF-8") + "\">" + Utils.encodeHTML(rs.getString(1)) + "</a></li>";
+                } catch (UnsupportedEncodingException e) {
+                }
+            }
+        } catch (SQLException e) {
+            System.err.println(e);
+        } finally {
+            Utils.finishSQL(rs, stmt);
+        }
+
+        return ret;
+    }
 }