Issue 573: Add implementation for Methods "isWrapperFor()" and "unwrap()" in JdbcConnection.java,

patch by BigMichi1

h2/src/docsrc/html/changelog.html

@@ -31,6 +31,8 @@ Change Log
 </li><li>Auto-scale MAX_MEMORY_ROWS and CACHE_SIZE settings by the amount of available RAM. Gives a better
     out of box experience for people with more powerful machines.
 </li><li>Handle tabs like 4 spaces in web console, patch by Martin Grajcar
+</li><li>Issue 573: Add implementation for Methods "isWrapperFor()" and "unwrap()" in JdbcConnection.java,
+    patch by BigMichi1
 </li></ul>
 
 <h2>Version 1.4.180 Beta (2014-07-13)</h2>

h2/src/main/org/h2/jdbc/JdbcConnection.java

@@ -1764,23 +1764,27 @@ public class JdbcConnection extends TraceObject implements Connection {
     }
 
     /**
-     * [Not supported] Return an object of this class if possible.
+     * Return an object of this class if possible.
      *
      * @param iface the class
      */
     @Override
+    @SuppressWarnings("unchecked")
     public <T> T unwrap(Class<T> iface) throws SQLException {
-        throw unsupported("unwrap");
+	    if (isWrapperFor(iface)) {
+		    return (T) this;
+	    }
+	    throw DbException.getInvalidValueException("iface", iface);
     }
 
     /**
-     * [Not supported] Checks if unwrap can return an object of this class.
+     * Checks if unwrap can return an object of this class.
      *
      * @param iface the class
      */
     @Override
     public boolean isWrapperFor(Class<?> iface) throws SQLException {
-        throw unsupported("isWrapperFor");
+	    return (iface != null && iface.isAssignableFrom(getClass()));
     }
 
     /**