Issue 573: Add implementation for Methods "isWrapperFor()" and "unwrap()" in other JDBC classes.

h2/src/test/org/h2/test/jdbc/TestMetaData.java

@@ -39,6 +39,7 @@ public class TestMetaData extends TestBase {
     @Override
     public void test() throws SQLException {
         deleteDb("metaData");
+        testUnwrap();
         testUnsupportedOperations();
         testTempTable();
         testColumnResultSetMeta();
@@ -56,16 +57,29 @@ public class TestMetaData extends TestBase {
         testSessionsUncommitted();
         testQueryStatistics();
     }
+    
+    private void testUnwrap() throws SQLException {
+        Connection conn = getConnection("metaData");
+        Statement stat = conn.createStatement();
+        ResultSet rs = stat.executeQuery("select 1 as x from dual");
+        ResultSetMetaData meta = rs.getMetaData();
+        assertTrue(meta.isWrapperFor(Object.class));
+        assertTrue(meta.isWrapperFor(ResultSetMetaData.class));
+        assertTrue(meta.isWrapperFor(meta.getClass()));
+        assertTrue(meta == meta.unwrap(Object.class));
+        assertTrue(meta == meta.unwrap(ResultSetMetaData.class));
+        assertTrue(meta == meta.unwrap(meta.getClass()));
+        assertFalse(meta.isWrapperFor(Integer.class));
+        assertThrows(ErrorCode.INVALID_VALUE_2, meta).
+                unwrap(Integer.class);
+        conn.close();
+    }
 
     private void testUnsupportedOperations() throws SQLException {
         Connection conn = getConnection("metaData");
         Statement stat = conn.createStatement();
         ResultSet rs = stat.executeQuery("select 1 as x from dual");
         ResultSetMetaData meta = rs.getMetaData();
-        assertThrows(ErrorCode.FEATURE_NOT_SUPPORTED_1, meta).
-                isWrapperFor(Object.class);
-        assertThrows(ErrorCode.FEATURE_NOT_SUPPORTED_1, meta).
-                unwrap(Object.class);
         assertThrows(ErrorCode.INVALID_VALUE_2, meta).getColumnLabel(0);
         assertThrows(ErrorCode.INVALID_VALUE_2, meta).getColumnName(0);
         assertThrows(ErrorCode.INVALID_VALUE_2, meta).getColumnType(0);
@@ -971,6 +985,7 @@ public class TestMetaData extends TestBase {
     private void testGeneral() throws SQLException {
         Connection conn = getConnection("metaData");
         DatabaseMetaData meta = conn.getMetaData();
+        
         Statement stat = conn.createStatement();
 
         stat.execute("CREATE TABLE TEST(ID INT PRIMARY KEY, NAME VARCHAR(255))");

h2/src/test/org/h2/test/jdbc/TestPreparedStatement.java

@@ -56,6 +56,7 @@ public class TestPreparedStatement extends TestBase {
     public void test() throws Exception {
         deleteDb("preparedStatement");
         Connection conn = getConnection("preparedStatement");
+        testUnwrap(conn);
         testUnsupportedOperations(conn);
         testChangeType(conn);
         testDateTimeTimestampWithCalendar(conn);
@@ -95,6 +96,17 @@ public class TestPreparedStatement extends TestBase {
         testPreparedStatementWithLiteralsNone();
         deleteDb("preparedStatement");
     }
+    
+    private void testUnwrap(Connection conn) throws SQLException {
+        assertTrue(conn.isWrapperFor(Object.class));
+        assertTrue(conn.isWrapperFor(Connection.class));
+        assertTrue(conn.isWrapperFor(conn.getClass()));
+        assertFalse(conn.isWrapperFor(String.class));
+        assertTrue(conn == conn.unwrap(Object.class));
+        assertTrue(conn == conn.unwrap(Connection.class));
+        assertThrows(ErrorCode.INVALID_VALUE_2, conn).
+                unwrap(String.class);
+    }
 
     @SuppressWarnings("deprecation")
     private void testUnsupportedOperations(Connection conn) throws Exception {
@@ -134,17 +146,6 @@ public class TestPreparedStatement extends TestBase {
 
         ParameterMetaData meta = prep.getParameterMetaData();
         assertTrue(meta.toString(), meta.toString().endsWith("parameterCount=1"));
-        assertThrows(ErrorCode.FEATURE_NOT_SUPPORTED_1, meta).
-                isWrapperFor(Object.class);
-        assertThrows(ErrorCode.FEATURE_NOT_SUPPORTED_1, meta).
-                unwrap(Object.class);
-
-        assertTrue(conn.isWrapperFor(Object.class));
-        assertTrue(conn.isWrapperFor(Connection.class));
-        assertFalse(conn.isWrapperFor(String.class));
-        assertTrue(conn == conn.unwrap(Object.class));
-        assertTrue(conn == conn.unwrap(Connection.class));
-        assertThrows(ErrorCode.INVALID_VALUE_2, conn).unwrap(String.class);
         assertThrows(ErrorCode.FEATURE_NOT_SUPPORTED_1, conn).
                 createSQLXML();
         assertThrows(ErrorCode.FEATURE_NOT_SUPPORTED_1, conn).

h2/src/test/org/h2/test/jdbc/TestResultSet.java

@@ -63,6 +63,7 @@ public class TestResultSet extends TestBase {
 
         stat = conn.createStatement();
 
+        testUnwrap();
         testReuseSimpleResult();
         testUnsupportedOperations();
         testAmbiguousColumnNames();
@@ -101,6 +102,19 @@ public class TestResultSet extends TestBase {
         deleteDb("resultSet");
 
     }
+    
+    private void testUnwrap() throws SQLException {
+        ResultSet rs = stat.executeQuery("select 1");
+        assertTrue(rs.isWrapperFor(Object.class));
+        assertTrue(rs.isWrapperFor(ResultSet.class));
+        assertTrue(rs.isWrapperFor(rs.getClass()));
+        assertFalse(rs.isWrapperFor(Integer.class));
+        assertTrue(rs == rs.unwrap(Object.class));
+        assertTrue(rs == rs.unwrap(ResultSet.class));
+        assertTrue(rs == rs.unwrap(rs.getClass()));
+        assertThrows(ErrorCode.FEATURE_NOT_SUPPORTED_1, rs).
+                unwrap(Object.class);
+    }
 
     private void testReuseSimpleResult() throws SQLException {
         ResultSet rs = stat.executeQuery("select table(x array=((1)))");
@@ -166,10 +180,6 @@ public class TestResultSet extends TestBase {
                 getCursorName();
         assertThrows(ErrorCode.FEATURE_NOT_SUPPORTED_1, rs).
                 setFetchDirection(ResultSet.FETCH_FORWARD);
-        assertThrows(ErrorCode.FEATURE_NOT_SUPPORTED_1, rs).
-                unwrap(Object.class);
-        assertThrows(ErrorCode.FEATURE_NOT_SUPPORTED_1, rs).
-                isWrapperFor(Object.class);
     }
 
     private void testAmbiguousColumnNames() throws SQLException {

h2/src/test/org/h2/test/jdbc/TestStatement.java

@@ -6,6 +6,7 @@
 package org.h2.test.jdbc;
 
 import java.sql.Connection;
+import java.sql.DatabaseMetaData;
 import java.sql.ResultSet;
 import java.sql.SQLClientInfoException;
 import java.sql.SQLException;
@@ -41,6 +42,7 @@ public class TestStatement extends TestBase {
     public void test() throws Exception {
         deleteDb("statement");
         conn = getConnection("statement");
+        testUnwrap();
         testUnsupportedOperations();
         testTraceError();
         testSavepoint();
@@ -51,14 +53,22 @@ public class TestStatement extends TestBase {
         conn.close();
         deleteDb("statement");
     }
-
-    private void testUnsupportedOperations() throws Exception {
+    
+    private void testUnwrap() throws SQLException {
         Statement stat = conn.createStatement();
+        assertTrue(stat.isWrapperFor(Object.class));
+        assertTrue(stat.isWrapperFor(DatabaseMetaData.class));
+        assertTrue(stat.isWrapperFor(stat.getClass()));
+        assertTrue(stat == stat.unwrap(Object.class));
+        assertTrue(stat == stat.unwrap(DatabaseMetaData.class));
+        assertTrue(stat == stat.unwrap(stat.getClass()));
         assertThrows(ErrorCode.FEATURE_NOT_SUPPORTED_1, stat).
             isWrapperFor(Object.class);
         assertThrows(ErrorCode.FEATURE_NOT_SUPPORTED_1, stat).
             unwrap(Object.class);
+    }
 
+    private void testUnsupportedOperations() throws Exception {
         conn.setTypeMap(null);
         HashMap<String, Class<?>> map = New.hashMap();
         conn.setTypeMap(map);