wip 2: revisited design

Still missing tests and example

server/src/main/java/com/vaadin/data/Binder.java

@@ -99,8 +99,8 @@ import com.vaadin.util.ReflectTools;
  */
 public class Binder<BEAN> implements Serializable {
 
-    // TODO get default factory from session / ui like in V7 ?
-    private BindingConverterFactory defaultConverter;
+    private final DefaultConverterFactory defaultConverterFactory = new DefaultConverterFactory();
+    private ConverterFactory customConverterFactory;
 
     /**
      * Represents the binding between a field and a data property.
@@ -2639,28 +2639,26 @@ public class Binder<BEAN> implements Serializable {
                     memberField.getName(),
                     objectWithMemberFields.getClass().getName()));
         }
+        HasValue<?> field;
+        // Get the field from the object
+        try {
+            field = (HasValue<?>) ReflectTools.getJavaFieldValue(
+                    objectWithMemberFields, memberField, HasValue.class);
+        } catch (IllegalArgumentException | IllegalAccessException
+                | InvocationTargetException e) {
+            // If we cannot determine the value, just skip the field
+            return false;
+        }
+        if (field == null) {
+            field = makeFieldInstance(
+                    (Class<? extends HasValue<?>>) memberField.getType());
+            initializeField(objectWithMemberFields, memberField, field);
+        }
+        BindingBuilder builder = forField(field);
+
         Class<?> fieldClass = GenericTypeReflector.erase(valueType);
-        if (propertyType.equals(fieldClass) || (defaultConverter != null
-                && defaultConverter.isSupported(fieldClass, propertyType))) {
-            HasValue<?> field;
-            // Get the field from the object
-            try {
-                field = (HasValue<?>) ReflectTools.getJavaFieldValue(
-                        objectWithMemberFields, memberField, HasValue.class);
-            } catch (IllegalArgumentException | IllegalAccessException
-                    | InvocationTargetException e) {
-                // If we cannot determine the value, just skip the field
-                return false;
-            }
-            if (field == null) {
-                field = makeFieldInstance(
-                        (Class<? extends HasValue<?>>) memberField.getType());
-                initializeField(objectWithMemberFields, memberField, field);
-            }
-            BindingBuilder builder = forField(field);
-            if (defaultConverter != null)
-                builder = defaultConverter.buildBindingConverter(builder, fieldClass,
-                        propertyType);
+        if (propertyType.equals(fieldClass)
+                || applyConverterFactory(builder, propertyType, fieldClass)) {
             builder.bind(property);
             return true;
         } else {
@@ -2672,27 +2670,13 @@ public class Binder<BEAN> implements Serializable {
         }
     }
 
-    /**
-     * @return the current default binding converter
-     */
-    public BindingConverterFactory getDefaultConverter() {
-        return defaultConverter;
-    }
-
-    /**
-     * Set at default binding converter. If this is set, it is used when
-     * {@link #bindInstanceFields(Object)} is called. The default converter is
-     * able to convert a set of input classes to a given range of output
-     * classes. This is typically used for automatically binding Integer,
-     * Double, Long or Float to a TextField (which use String as a return
-     * value). It may also be used to convert {@link java.time.LocalDateTime}
-     * (or LocalDate) to the old {@link java.util.Date}
-     *
-     * @param defaultConverter
-     *            an interface for converting values
-     */
-    public void setDefaultConverter(DefaultBindingConverterFactory defaultConverter) {
-        this.defaultConverter = defaultConverter;
+    private boolean applyConverterFactory(BindingBuilder bindingBuilder,
+            Class<?> modelType, Class<?> presentationType) {
+        return customConverterFactory != null
+                && customConverterFactory.applyConverter(bindingBuilder,
+                        presentationType, modelType)
+                || getDefaultConverterFactory().applyConverter(bindingBuilder,
+                        presentationType, modelType);
     }
 
     /**
@@ -2923,6 +2907,37 @@ public class Binder<BEAN> implements Serializable {
                 .ifPresent(Binding::unbind);
     }
 
+    /**
+     * TODO
+     * 
+     * @return
+     * @since
+     */
+    public ConverterFactory getCustomConverterFactory() {
+        return customConverterFactory;
+    }
+
+    /**
+     * TODO
+     * 
+     * @param customConverterFactory
+     * @since
+     */
+    public void setCustomConverterFactory(
+            ConverterFactory customConverterFactory) {
+        this.customConverterFactory = customConverterFactory;
+    }
+
+    /**
+     * TODO
+     * 
+     * @return
+     * @since
+     */
+    public DefaultConverterFactory getDefaultConverterFactory() {
+        return defaultConverterFactory;
+    }
+
     private static final Logger getLogger() {
         return Logger.getLogger(Binder.class.getName());
     }

server/src/main/java/com/vaadin/data/BindingConverterFactory.java → server/src/main/java/com/vaadin/data/ConverterFactory.java

@@ -23,12 +23,20 @@ import java.io.Serializable;
  * Binder when creating bindings with {@link Binder#bindInstanceFields(Object)}.
  * <p>
  * The framework default implementation is
- * {@link DefaultBindingConverterFactory}.
+ * {@link DefaultConverterFactory}.
  *
  * @author Vaadin Ltd.
  * @since
  */
-public interface BindingConverterFactory extends Serializable {
+public interface ConverterFactory extends Serializable {
+
+    <PRESENTATION, MODEL> boolean applyConverter(
+            Binder.BindingBuilder<MODEL, PRESENTATION> bindingBuilder,
+            Class<PRESENTATION> presentationType, Class<MODEL> modelType);
+
+//    <MODEL, PRESENTATION> Optional<Consumer<Binder.BindingBuilder<MODEL,
+//            PRESENTATION>>> getConverterApplier(
+//          Class<PRESENTATION> presentationType, Class<MODEL> modelType);
 
     /**
      * Builds converter to the given binding to convert between the presentation
@@ -43,8 +51,9 @@ public interface BindingConverterFactory extends Serializable {
      *            the bean property type
      * @return the binder builder with converter applied if possible
      */
-    Binder.BindingBuilder buildBindingConverter(Binder.BindingBuilder builder,
-            Class<?> presentationType, Class<?> modelType);
+    // Binder.BindingBuilder buildBindingConverter(Binder.BindingBuilder
+    // builder,
+    // Class<?> presentationType, Class<?> modelType);
 
     /**
      * Returns whether this factory has a converter to convert between the
@@ -57,6 +66,6 @@ public interface BindingConverterFactory extends Serializable {
      *            class of the property type in the entity
      * @return {@code true} if conversion possible, {@code false} if not
      */
-    boolean isSupported(Class<?> presentationType, Class<?> modelType);
+    // boolean isSupported(Class<?> presentationType, Class<?> modelType);
 
 }

server/src/main/java/com/vaadin/data/DefaultBindingConverterFactory.java → server/src/main/java/com/vaadin/data/DefaultConverterFactory.java

@@ -45,7 +45,7 @@ import com.vaadin.server.SerializableFunction;
 /**
  * TODO
  */
-public class DefaultBindingConverterFactory implements BindingConverterFactory {
+public class DefaultConverterFactory implements ConverterFactory {
 
     private static final Map<Class<?>, Set<Class<?>>> SUPPORTED_PRESENTATION_TO_MODEL_CONVERTERS_MAP = new HashMap<>();
     static {
@@ -60,6 +60,8 @@ public class DefaultBindingConverterFactory implements BindingConverterFactory {
                 new HashSet<>(Collections.singletonList(Date.class)));
     }
 
+    // TODO: provide setters for customizing default behavior
+
     private static final SerializableFunction<Class, ErrorMessageProvider> TYPE_BASED_ERROR_MESSAGE_PROVIDER = clazz -> context -> String
             .format("Invalid value, expected ${0}", clazz.getSimpleName());
 
@@ -68,34 +70,36 @@ public class DefaultBindingConverterFactory implements BindingConverterFactory {
     }
 
     @Override
-    public Binder.BindingBuilder buildBindingConverter(
-            Binder.BindingBuilder builder, Class<?> presentationType,
-            Class<?> modelType) {
+    public <PRESENTATION, MODEL> boolean applyConverter(
+            Binder.BindingBuilder<MODEL, PRESENTATION> builder,
+            Class<PRESENTATION> presentationType, Class<MODEL> modelType) {
         if (isSupported(presentationType, modelType)) {
-            Supplier<?> nullRepresentationProvider = getNullRepresentationProvider(
+            Supplier<PRESENTATION> nullRepresentationProvider = getNullRepresentationProvider(
                     presentationType, modelType);
             if (nullRepresentationProvider != null) {
-                builder = builder.withNullRepresentation(
+                builder.withNullRepresentation(
                         nullRepresentationProvider.get());
             }
             if (presentationType == String.class) {
-                builder = builder
+                ((Binder.BindingBuilder<MODEL, String>)builder)
                         .withConverter(createStringConverter(modelType));
             } else if (presentationType == LocalDateTime.class) {
                 if (modelType == Date.class) {
-                    builder = builder
+                    ((Binder.BindingBuilder<Date, LocalDateTime>)builder)
                             .withConverter(new LocalDateTimeToDateConverter(
                                     getZoneIdForDateConverters()));
                 }
             } else if (presentationType == LocalDate.class) {
                 if (modelType == Date.class) {
-                    builder = builder
+                    ((Binder.BindingBuilder<Date, LocalDate>)builder)
                             .withConverter(new LocalDateToDateConverter(
                                     getZoneIdForDateConverters()));
                 }
             }
+            return true;
+        } else {
+            return false;
         }
-        return builder;
     }
 
     /**
@@ -147,10 +151,10 @@ public class DefaultBindingConverterFactory implements BindingConverterFactory {
      * @return the null representation provider, or {@code null} to prevent
      *         conversion of {@code null} model value
      */
-    protected Supplier<?> getNullRepresentationProvider(
-            Class<?> presentationType, Class<?> modelType) {
+    protected <PRESENTATION> Supplier<PRESENTATION> getNullRepresentationProvider(
+            Class<PRESENTATION> presentationType, Class<?> modelType) {
         if (presentationType.equals(String.class)) {
-            return () -> "";
+            return () -> (PRESENTATION) "";
         }
         return null;
     }
@@ -172,8 +176,7 @@ public class DefaultBindingConverterFactory implements BindingConverterFactory {
         return ZoneId.systemDefault();
     }
 
-    @Override
-    public boolean isSupported(Class<?> presentationType, Class<?> modelType) {
+    private boolean isSupported(Class<?> presentationType, Class<?> modelType) {
         Set<Class<?>> supported = SUPPORTED_PRESENTATION_TO_MODEL_CONVERTERS_MAP
                 .get(presentationType);
         return supported != null && supported.size() > 0