Added test demonstrating hacking around JsonProvider to pass custom g…

…enerator / parser directly.

Signed-off-by: Roman Grigoriadi <[email protected]>

src/test/java/info/grigoriadi/yasson/jdbc/CustomJsonProviderTest.java

@@ -1,15 +1,33 @@
 package info.grigoriadi.yasson.jdbc;
 
+import org.eclipse.yasson.internal.JsonbContext;
+import org.eclipse.yasson.internal.JsonbParser;
+import org.eclipse.yasson.internal.JsonbRiParser;
+import org.eclipse.yasson.internal.Marshaller;
+import org.eclipse.yasson.internal.Unmarshaller;
+import org.junit.Before;
 import org.junit.Test;
 
 import javax.json.bind.Jsonb;
 import javax.json.bind.JsonbBuilder;
+import javax.json.bind.JsonbConfig;
+import javax.json.spi.JsonProvider;
 import java.io.ByteArrayOutputStream;
 import java.io.InputStream;
 import java.util.Arrays;
+import java.util.Locale;
 
 public class CustomJsonProviderTest {
 
+    private static final String EXPECTED_JSON = "{\"age\":4,\"name\":\"Falco, (written by TestJsonGenerator)\"}";
+
+    private static final String EXPECTED_NAME = "Falco, (parsed with TestJsonParser)";
+
+    @Before
+    public void setUp() {
+        DB.getInstance().store(null);
+    }
+
     @Test
     public void testProvider() {
 
@@ -35,8 +53,7 @@ public void testProvider() {
         pstmt.executeUpdate();
 
         //Verify that custom generator was used:
-        String expectedJson = "{\"age\":4,\"name\":\"Falco, (written by TestJsonGenerator)\"}";
-        if (!Arrays.equals(expectedJson.getBytes(), DB.getInstance().get())) {
+        if (!Arrays.equals(EXPECTED_JSON.getBytes(), DB.getInstance().get())) {
             throw new RuntimeException("Custom generator not used!");
         }
 
@@ -51,13 +68,56 @@ public void testProvider() {
         Dog dogUnmarshalled = jsonb.fromJson(is, Dog.class);
 
         // Verify that custom parser was used:
-        if (!"Falco, (parsed with TestJsonParser)".equals(dogUnmarshalled.name)) {
+        if (!EXPECTED_NAME.equals(dogUnmarshalled.name)) {
             throw new RuntimeException("Custom parser not used");
         }
 
         System.out.println("End of demo");
     }
 
+    @Test
+    public void testWithoutProvider() {
+        Dog dog = new Dog();
+        dog.name = "Falco";
+        dog.age = 4;
+        JsonbConfig config = new JsonbConfig();
+        //put your config here:
+        config.withLocale(Locale.getDefault()); //does nothing
+
+        // !!! ATTENTION !!! - following are imports for Yasson's ".internal" package
+        JsonbContext context = new JsonbContext(config, null);
+        ByteArrayOutputStream baos = new ByteArrayOutputStream();
+        Marshaller marshaller = new Marshaller(context);
+        marshaller.marshall(dog, new TestJsonGenerator(JsonProvider.provider().createGenerator(baos)));
+
+        // Insert the marshalled dog
+        PreparedStatement pstmt = new PreparedStatement();
+        pstmt.setObject(1, baos.toByteArray());
+        pstmt.executeUpdate();
+
+        //Verify that custom generator was used:
+        if (!Arrays.equals(EXPECTED_JSON.getBytes(), DB.getInstance().get())) {
+            throw new RuntimeException("Custom generator not used!");
+        }
+
+        // Select the marshalled dog
+        ResultSet rs = new ResultSet();
+        rs.next();
+
+        // Instead of returning parser return an InputStream, so the parser may be created by provider later.
+        InputStream is = rs.getObject(1, InputStream.class);
+
+        Unmarshaller unmarshaller = new Unmarshaller(context);
+        TestJsonParser testJsonParser = new TestJsonParser(JsonProvider.provider().createParser(is));
+        JsonbParser parser = new JsonbRiParser(testJsonParser);
+        Dog result = unmarshaller.deserialize(Dog.class, parser);
+
+        // Verify that custom parser was used:
+        if (!EXPECTED_NAME.equals(result.name)) {
+            throw new RuntimeException("Custom parser not used");
+        }
+    }
+
     public static class Dog {
         public String name;
         public Integer age;