Database URLs can now be re-mapped to another URL using the system property…

Database URLs can now be re-mapped to another URL using the system property "h2.urlMap", which points to a properties file with database URL mappings.

h2/src/main/org/h2/Driver.java

@@ -11,11 +11,13 @@ import java.sql.DriverManager;
 import java.sql.DriverPropertyInfo;
 import java.sql.SQLException;
 import java.util.Properties;
+import org.h2.constant.SysProperties;
 import org.h2.engine.Constants;
 import org.h2.jdbc.JdbcConnection;
 import org.h2.message.DbException;
 import org.h2.message.TraceSystem;
 import org.h2.upgrade.DbUpgrade;
+import org.h2.util.SortedProperties;
 
 /*## Java 1.7 begin ##
 import java.util.logging.Logger;
@@ -62,6 +64,17 @@ public class Driver implements java.sql.Driver {
             if (!acceptsURL(url)) {
                 return null;
             }
+            String urlMap = SysProperties.URL_MAP;
+            if (urlMap != null && urlMap.length() > 0) {
+                SortedProperties prop = SortedProperties.loadProperties(urlMap);
+                String url2 = prop.getProperty(url);
+                if (url2 == null) {
+                    prop.put(url, "");
+                    prop.store(urlMap);
+                } else {
+                    url = url2;
+                }
+            }
             if (url.equals(DEFAULT_URL)) {
                 return DEFAULT_CONNECTION.get();
             }

h2/src/main/org/h2/constant/SysProperties.java

@@ -373,6 +373,14 @@ public class SysProperties {
      */
     public static final boolean TRACE_IO = Utils.getProperty("h2.traceIO", false);
 
+    /**
+     * System property <code>h2.urlMap</code> (default: null).<br />
+     * A properties file that contains a mapping between database URLs. New
+     * connections are written into the file. An empty value in the map means no
+     * redirection is used for the given URL.
+     */
+    public static final String URL_MAP = Utils.getProperty("h2.urlMap", null);
+
     /**
      * System property <code>h2.webMaxValueLength</code> (default: 100000).<br />
      * The H2 Console will abbreviate (truncate) result values larger than this size.