Add database migration functionality

src/uk/co/md87/evetool/ConfigManager.java

@@ -26,6 +26,8 @@ import com.dmdirc.util.ConfigFile;
 import com.dmdirc.util.InvalidConfigFileException;
 import java.io.File;
 import java.io.IOException;
+import java.lang.reflect.InvocationTargetException;
+import java.sql.Connection;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 
@@ -39,6 +41,8 @@ public class ConfigManager {
     /** Logger to use for this class. */
     private static final Logger LOGGER = Logger.getLogger(ConfigManager.class.getName());
 
+    private static final int DBVERSION = 2;
+
     private final ConfigFile configFile;
  
     public ConfigManager() {
@@ -59,13 +63,22 @@ public class ConfigManager {
             LOGGER.log(Level.WARNING, "Error parsing config file", ex);
         }
 
-        initDefaults();
-
         Runtime.getRuntime().addShutdownHook(new Thread(new ShutdownHook()));
     }
 
-    protected void initDefaults() {
-        setGeneralSetting("dbVersion", getGeneralSettingInt("dbVersion", 1));
+    public void checkDatabase(final Connection conn) {
+        final DBMigrator migrator = new DBMigrator(conn);
+        for (int i = getGeneralSettingInt("dbVersion", DBVERSION) + 1; i <= DBVERSION; i++) {
+            LOGGER.log(Level.INFO, "Running database migration method #" + i);
+            
+            try {
+                DBMigrator.class.getMethod("migrateTo" + i).invoke(migrator);
+            } catch (Exception ex) {
+                LOGGER.log(Level.SEVERE, "Unable to run database migration", ex);
+            }
+        }
+
+        setGeneralSetting("dbVersion", DBVERSION);
     }
 
     public String getGeneralSetting(final String key) {

src/uk/co/md87/evetool/DBMigrator.java

@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2009 Chris Smith
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package uk.co.md87.evetool;
+
+import java.sql.Connection;
+import java.sql.SQLException;
+
+/**
+ *
+ * TODO: Document DBMigrator
+ * @author chris
+ */
+public class DBMigrator {
+
+    private final Connection conn;
+
+    public DBMigrator(final Connection conn) {
+        this.conn = conn;
+    }
+
+    public void migrateTo2() throws SQLException {
+        // The API changed to include a new raceID field, but the data may
+        // have previously been cached for months
+        conn.prepareStatement("DELETE FROM PageCache WHERE pc_method LIKE " +
+                "'http://evetool.md87.co.uk/%'").execute();
+    }
+
+}

src/uk/co/md87/evetool/Main.java

@@ -58,6 +58,8 @@ public class Main {
         final ConfigManager config = new ConfigManager();
         final ApiFactory factory = new ApiFactory(config);
 
+        config.checkDatabase(factory.getConnection());
+
         readVersion();
         initTables(factory);