From 1b5c19b3e42f4549ebb863cd97d2656e833ce516 Mon Sep 17 00:00:00 2001
From: "David A. Madore" <david+git@madore.org>
Date: Tue, 7 Oct 2014 15:42:07 +0200
Subject: Implement .getLastModified() on WeblogServlet.
---
org/madore/damlengine/WeblogServlet.java | 81 ++++++++++++++++++++++++++++----
1 file changed, 72 insertions(+), 9 deletions(-)
diff --git a/org/madore/damlengine/WeblogServlet.java b/org/madore/damlengine/WeblogServlet.java
index f9d23e3..568a9ec 100644
--- a/org/madore/damlengine/WeblogServlet.java
+++ b/org/madore/damlengine/WeblogServlet.java
@@ -7,6 +7,10 @@ import java.util.Enumeration;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.file.Paths;
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
@@ -30,7 +34,7 @@ import javax.servlet.http.HttpServletResponse;
public class WeblogServlet extends HttpServlet {
- private static final long serialVersionUID = 2014100701L;
+ private static final long serialVersionUID = 2014100703L;
@Override
public void init(ServletConfig cfg)
@@ -55,22 +59,67 @@ public class WeblogServlet extends HttpServlet {
} }
}
+ static abstract class RequestPath {
+ public static RequestPath parsePath(String pathInfo)
+ throws ServletException {
+ Matcher matcher;
+ if ( pathInfo == null )
+ return new NoSuchPath();
+ if ( (matcher=Pattern.compile("/(\\d{1,7})").matcher(pathInfo)).matches() ) {
+ final int number;
+ try {
+ number = Integer.parseInt(matcher.group(1));
+ } catch (NumberFormatException e) {
+ return new NoSuchPath();
+ }
+ try {
+ final Connection conn = WeblogDatabaseConnection.getConnection();
+ final PreparedStatement selSt
+ = conn.prepareStatement("SELECT id , extract(epoch from mdate) FROM entries WHERE id=?");
+ selSt.setInt(1,number);
+ final ResultSet selRes = selSt.executeQuery();
+ if ( selRes.next() ) {
+ int id = selRes.getInt(1);
+ double mdate = selRes.getDouble(2);
+ if ( id != number )
+ throw new ServletException("this cannot happen");
+ long lastModified = ((long)mdate)*1000;
+ // O'Reilly recommends not using milliseconds part.
+ return new SingleBlogEntryPath(number, lastModified);
+ } else
+ return new NoSuchPath();
+ } catch (SQLException e) {
+ throw new ServletException(e);
+ }
+ }
+ return new NoSuchPath();
+ }
+ }
+
+ static final class NoSuchPath extends RequestPath { }
+
+ static final class SingleBlogEntryPath extends RequestPath {
+ public int number;
+ public long lastModified;
+ public SingleBlogEntryPath(int number, long lastModified) {
+ this.number = number;
+ this.lastModified = lastModified;
+ }
+ }
+
@Override
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws IOException, ServletException
{
- Matcher matcher;
- int number = -1;
- if ( (matcher=Pattern.compile("/(\\d{1,7})").matcher(request.getPathInfo())).matches() ) {
- try {
- number = Integer.parseInt(matcher.group(1));
- } catch (NumberFormatException e) { }
- }
- if ( number == -1 ) {
+ final RequestPath rp = RequestPath.parsePath(request.getPathInfo());
+ if ( rp instanceof NoSuchPath ) {
response.sendError(HttpServletResponse.SC_NOT_FOUND);
return;
}
+ if ( ! (rp instanceof SingleBlogEntryPath) )
+ throw new ServletException("this cannot happen");
+ final int number = ((SingleBlogEntryPath)rp).number;
response.setContentType("text/html; charset=utf-8");
response.setCharacterEncoding("UTF-8");
OutputStream out = response.getOutputStream();
@@ -80,6 +129,20 @@ public class WeblogServlet extends HttpServlet {
} catch (Exception e) {
throw new ServletException("exception during WeblogSelect.fullProcess()", e);
}
+ }
+ @Override
+ public long getLastModified(HttpServletRequest request) {
+ final RequestPath rp;
+ try {
+ rp = RequestPath.parsePath(request.getPathInfo());
+ } catch (Exception e) {
+ return -1;
+ }
+ if ( rp instanceof SingleBlogEntryPath ) {
+ final long lastModified = ((SingleBlogEntryPath)rp).lastModified;
+ return lastModified;
+ }
+ return -1;
}
}
--
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