Add ValueContext parameter for Converters

Change-Id: I47179b06b9e345f5a454ac1806d0bc9bcac24bcf

24 files changed, 240 insertions, 85 deletions

diff --git a/server/src/main/java/com/vaadin/data/Binder.java b/server/src/main/java/com/vaadin/data/Binder.java
index 8356a03dda..5493712cec 100644
--- a/server/src/main/java/com/vaadin/data/Binder.java
+++ b/server/src/main/java/com/vaadin/data/Binder.java
@@ -34,6 +34,7 @@ import java.util.stream.Collectors;
 
 import com.vaadin.data.util.converter.Converter;
 import com.vaadin.data.util.converter.StringToIntegerConverter;
+import com.vaadin.data.util.converter.ValueContext;
 import com.vaadin.event.EventRouter;
 import com.vaadin.server.ErrorMessage;
 import com.vaadin.server.UserError;
@@ -563,10 +564,23 @@ public class Binder<BEAN> implements Serializable {
         private ValidationStatus<TARGET> doValidation() {
             FIELDVALUE fieldValue = field.getValue();
             Result<TARGET> dataValue = converterValidatorChain
-                    .convertToModel(fieldValue, findLocale());
+                    .convertToModel(fieldValue, createValueContext());
             return new ValidationStatus<>(this, dataValue);
         }
 
+        /**
+         * Creates a value context from the current state of the binding and its
+         * field.
+         *
+         * @return the value context
+         */
+        protected ValueContext createValueContext() {
+            if (field instanceof Component) {
+                return new ValueContext((Component) field);
+            }
+            return new ValueContext(findLocale());
+        }
+
         private void unbind() {
             onValueChange.remove();
         }
@@ -584,8 +598,8 @@ public class Binder<BEAN> implements Serializable {
         }
 
         private FIELDVALUE convertDataToFieldType(BEAN bean) {
-            return converterValidatorChain
-                    .convertToPresentation(getter.apply(bean), findLocale());
+            return converterValidatorChain.convertToPresentation(
+                    getter.apply(bean), createValueContext());
         }
 
         /**
@@ -661,7 +675,7 @@ public class Binder<BEAN> implements Serializable {
         }
 
         @Override
-        public Result<T> convertToModel(T value, Locale locale) {
+        public Result<T> convertToModel(T value, ValueContext context) {
             Result<? super T> validationResult = validator.apply(value);
             if (validationResult.isError()) {
                 return Result.error(validationResult.getMessage().get());
@@ -671,7 +685,7 @@ public class Binder<BEAN> implements Serializable {
         }
 
         @Override
-        public T convertToPresentation(T value, Locale locale) {
+        public T convertToPresentation(T value, ValueContext context) {
             return value;
         }
 
diff --git a/server/src/main/java/com/vaadin/data/util/converter/AbstractStringToNumberConverter.java b/server/src/main/java/com/vaadin/data/util/converter/AbstractStringToNumberConverter.java
index c06a9baa61..e7f4476f66 100644
--- a/server/src/main/java/com/vaadin/data/util/converter/AbstractStringToNumberConverter.java
+++ b/server/src/main/java/com/vaadin/data/util/converter/AbstractStringToNumberConverter.java
@@ -109,12 +109,12 @@ public abstract class AbstractStringToNumberConverter<T>
     }
 
     @Override
-    public String convertToPresentation(T value, Locale locale) {
+    public String convertToPresentation(T value, ValueContext context) {
         if (value == null) {
             return null;
         }
 
-        return getFormat(locale).format(value);
+        return getFormat(context.getLocale().orElse(null)).format(value);
     }
 
 }
diff --git a/server/src/main/java/com/vaadin/data/util/converter/Converter.java b/server/src/main/java/com/vaadin/data/util/converter/Converter.java
index 97985af9ca..c25c567773 100644
--- a/server/src/main/java/com/vaadin/data/util/converter/Converter.java
+++ b/server/src/main/java/com/vaadin/data/util/converter/Converter.java
@@ -45,11 +45,17 @@ public interface Converter<PRESENTATION, MODEL> extends Serializable {
      *
      * @param value
      *            The value to convert. Can be null
-     * @param locale
-     *            The locale to use for conversion. Can be null.
+     * @param context
+     *            The value context for the conversion.
      * @return The converted value compatible with the source type
      */
-    public Result<MODEL> convertToModel(PRESENTATION value, Locale locale);
+    public Result<MODEL> convertToModel(PRESENTATION value,
+            ValueContext context);
+
+    default public Result<MODEL> convertToModel(PRESENTATION value,
+            Locale locale) {
+        return convertToModel(value, new ValueContext(locale));
+    }
 
     /**
      * Converts the given value from presentation type to model type.
@@ -58,11 +64,17 @@ public interface Converter<PRESENTATION, MODEL> extends Serializable {
      *
      * @param value
      *            The value to convert. Can be null
-     * @param locale
-     *            The locale to use for conversion. Can be null.
+     * @param context
+     *            The value context for the conversion.
      * @return The converted value compatible with the source type
      */
-    public PRESENTATION convertToPresentation(MODEL value, Locale locale);
+    public PRESENTATION convertToPresentation(MODEL value,
+            ValueContext context);
+
+    default public PRESENTATION convertToPresentation(MODEL value,
+            Locale locale) {
+        return convertToPresentation(value, new ValueContext());
+    }
 
     /**
      * Returns a converter that returns its input as-is in both directions.
@@ -124,12 +136,12 @@ public interface Converter<PRESENTATION, MODEL> extends Serializable {
         return new Converter<P, M>() {
 
             @Override
-            public Result<M> convertToModel(P value, Locale locale) {
+            public Result<M> convertToModel(P value, ValueContext context) {
                 return toModel.apply(value);
             }
 
             @Override
-            public P convertToPresentation(M value, Locale locale) {
+            public P convertToPresentation(M value, ValueContext context) {
                 return toPresentation.apply(value);
             }
         };
@@ -157,16 +169,18 @@ public interface Converter<PRESENTATION, MODEL> extends Serializable {
             Converter<MODEL, T> other) {
         return new Converter<PRESENTATION, T>() {
             @Override
-            public Result<T> convertToModel(PRESENTATION value, Locale locale) {
+            public Result<T> convertToModel(PRESENTATION value,
+                    ValueContext context) {
                 Result<MODEL> model = Converter.this.convertToModel(value,
-                        locale);
-                return model.flatMap(v -> other.convertToModel(v, locale));
+                        context);
+                return model.flatMap(v -> other.convertToModel(v, context));
             }
 
             @Override
-            public PRESENTATION convertToPresentation(T value, Locale locale) {
-                MODEL model = other.convertToPresentation(value, locale);
-                return Converter.this.convertToPresentation(model, locale);
+            public PRESENTATION convertToPresentation(T value,
+                    ValueContext context) {
+                MODEL model = other.convertToPresentation(value, context);
+                return Converter.this.convertToPresentation(model, context);
             }
         };
     }
diff --git a/server/src/main/java/com/vaadin/data/util/converter/DateToLongConverter.java b/server/src/main/java/com/vaadin/data/util/converter/DateToLongConverter.java
index 2fff4915ee..bd51181f5e 100644
--- a/server/src/main/java/com/vaadin/data/util/converter/DateToLongConverter.java
+++ b/server/src/main/java/com/vaadin/data/util/converter/DateToLongConverter.java
@@ -17,7 +17,6 @@
 package com.vaadin.data.util.converter;
 
 import java.util.Date;
-import java.util.Locale;
 
 import com.vaadin.data.Result;
 
@@ -30,7 +29,7 @@ import com.vaadin.data.Result;
 public class DateToLongConverter implements Converter<Date, Long> {
 
     @Override
-    public Result<Long> convertToModel(Date value, Locale locale) {
+    public Result<Long> convertToModel(Date value, ValueContext context) {
         if (value == null) {
             return Result.ok(null);
         }
@@ -39,7 +38,7 @@ public class DateToLongConverter implements Converter<Date, Long> {
     }
 
     @Override
-    public Date convertToPresentation(Long value, Locale locale) {
+    public Date convertToPresentation(Long value, ValueContext context) {
         if (value == null) {
             return null;
         }
diff --git a/server/src/main/java/com/vaadin/data/util/converter/DateToSqlDateConverter.java b/server/src/main/java/com/vaadin/data/util/converter/DateToSqlDateConverter.java
index 5695e4bf9d..1fb7584e90 100644
--- a/server/src/main/java/com/vaadin/data/util/converter/DateToSqlDateConverter.java
+++ b/server/src/main/java/com/vaadin/data/util/converter/DateToSqlDateConverter.java
@@ -20,7 +20,6 @@
 package com.vaadin.data.util.converter;
 
 import java.util.Date;
-import java.util.Locale;
 
 import com.vaadin.data.Result;
 
@@ -37,7 +36,8 @@ import com.vaadin.data.Result;
 public class DateToSqlDateConverter implements Converter<Date, java.sql.Date> {
 
     @Override
-    public Result<java.sql.Date> convertToModel(Date value, Locale locale) {
+    public Result<java.sql.Date> convertToModel(Date value,
+            ValueContext context) {
         if (value == null) {
             return Result.ok(null);
         }
@@ -46,7 +46,8 @@ public class DateToSqlDateConverter implements Converter<Date, java.sql.Date> {
     }
 
     @Override
-    public Date convertToPresentation(java.sql.Date value, Locale locale) {
+    public Date convertToPresentation(java.sql.Date value,
+            ValueContext context) {
         if (value == null) {
             return null;
         }
diff --git a/server/src/main/java/com/vaadin/data/util/converter/StringToBigDecimalConverter.java b/server/src/main/java/com/vaadin/data/util/converter/StringToBigDecimalConverter.java
index af0a63fc7a..d30540d120 100644
--- a/server/src/main/java/com/vaadin/data/util/converter/StringToBigDecimalConverter.java
+++ b/server/src/main/java/com/vaadin/data/util/converter/StringToBigDecimalConverter.java
@@ -60,8 +60,9 @@ public class StringToBigDecimalConverter
     }
 
     @Override
-    public Result<BigDecimal> convertToModel(String value, Locale locale) {
-        return convertToNumber(value, locale)
+    public Result<BigDecimal> convertToModel(String value,
+            ValueContext context) {
+        return convertToNumber(value, context.getLocale().orElse(null))
                 .map(number -> (BigDecimal) number);
     }
 
diff --git a/server/src/main/java/com/vaadin/data/util/converter/StringToBigIntegerConverter.java b/server/src/main/java/com/vaadin/data/util/converter/StringToBigIntegerConverter.java
index d469db7055..186beb9d4b 100644
--- a/server/src/main/java/com/vaadin/data/util/converter/StringToBigIntegerConverter.java
+++ b/server/src/main/java/com/vaadin/data/util/converter/StringToBigIntegerConverter.java
@@ -60,14 +60,16 @@ public class StringToBigIntegerConverter
     }
 
     @Override
-    public Result<BigInteger> convertToModel(String value, Locale locale) {
-        return convertToNumber(value, locale).map(number -> {
-            if (number == null) {
-                return null;
-            } else {
-                return ((BigDecimal) number).toBigInteger();
-            }
-        });
+    public Result<BigInteger> convertToModel(String value,
+            ValueContext context) {
+        return convertToNumber(value, context.getLocale().orElse(null))
+                .map(number -> {
+                    if (number == null) {
+                        return null;
+                    } else {
+                        return ((BigDecimal) number).toBigInteger();
+                    }
+                });
     }
 
 }
diff --git a/server/src/main/java/com/vaadin/data/util/converter/StringToBooleanConverter.java b/server/src/main/java/com/vaadin/data/util/converter/StringToBooleanConverter.java
index 7b9e1850f0..38b27f8b50 100644
--- a/server/src/main/java/com/vaadin/data/util/converter/StringToBooleanConverter.java
+++ b/server/src/main/java/com/vaadin/data/util/converter/StringToBooleanConverter.java
@@ -72,7 +72,7 @@ public class StringToBooleanConverter implements Converter<String, Boolean> {
     }
 
     @Override
-    public Result<Boolean> convertToModel(String value, Locale locale) {
+    public Result<Boolean> convertToModel(String value, ValueContext context) {
         if (value == null) {
             return Result.ok(null);
         }
@@ -80,6 +80,7 @@ public class StringToBooleanConverter implements Converter<String, Boolean> {
         // Remove leading and trailing white space
         value = value.trim();
 
+        Locale locale = context.getLocale().orElse(null);
         if (getTrueString(locale).equals(value)) {
             return Result.ok(true);
         } else if (getFalseString(locale).equals(value)) {
@@ -92,10 +93,11 @@ public class StringToBooleanConverter implements Converter<String, Boolean> {
     }
 
     @Override
-    public String convertToPresentation(Boolean value, Locale locale) {
+    public String convertToPresentation(Boolean value, ValueContext context) {
         if (value == null) {
             return null;
         }
+        Locale locale = context.getLocale().orElse(null);
         if (value) {
             return getTrueString(locale);
         } else {
diff --git a/server/src/main/java/com/vaadin/data/util/converter/StringToDateConverter.java b/server/src/main/java/com/vaadin/data/util/converter/StringToDateConverter.java
index 2e3e8ab04a..d8a036c002 100644
--- a/server/src/main/java/com/vaadin/data/util/converter/StringToDateConverter.java
+++ b/server/src/main/java/com/vaadin/data/util/converter/StringToDateConverter.java
@@ -58,7 +58,7 @@ public class StringToDateConverter implements Converter<String, Date> {
     }
 
     @Override
-    public Result<Date> convertToModel(String value, Locale locale) {
+    public Result<Date> convertToModel(String value, ValueContext context) {
         if (value == null) {
             return Result.ok(null);
         }
@@ -67,7 +67,8 @@ public class StringToDateConverter implements Converter<String, Date> {
         value = value.trim();
 
         ParsePosition parsePosition = new ParsePosition(0);
-        Date parsedValue = getFormat(locale).parse(value, parsePosition);
+        Date parsedValue = getFormat(context.getLocale().orElse(null))
+                .parse(value, parsePosition);
         if (parsePosition.getIndex() != value.length()) {
             return Result.error("Could not convert '" + value);
         }
@@ -76,12 +77,12 @@ public class StringToDateConverter implements Converter<String, Date> {
     }
 
     @Override
-    public String convertToPresentation(Date value, Locale locale) {
+    public String convertToPresentation(Date value, ValueContext context) {
         if (value == null) {
             return null;
         }
 
-        return getFormat(locale).format(value);
+        return getFormat(context.getLocale().orElse(null)).format(value);
     }
 
 }
diff --git a/server/src/main/java/com/vaadin/data/util/converter/StringToDoubleConverter.java b/server/src/main/java/com/vaadin/data/util/converter/StringToDoubleConverter.java
index 463a7f6b36..52bf9509c9 100644
--- a/server/src/main/java/com/vaadin/data/util/converter/StringToDoubleConverter.java
+++ b/server/src/main/java/com/vaadin/data/util/converter/StringToDoubleConverter.java
@@ -49,8 +49,9 @@ public class StringToDoubleConverter
     }
 
     @Override
-    public Result<Double> convertToModel(String value, Locale locale) {
-        Result<Number> n = convertToNumber(value, locale);
+    public Result<Double> convertToModel(String value, ValueContext context) {
+        Result<Number> n = convertToNumber(value,
+                context.getLocale().orElse(null));
 
         return n.map(number -> {
             if (number == null) {
diff --git a/server/src/main/java/com/vaadin/data/util/converter/StringToFloatConverter.java b/server/src/main/java/com/vaadin/data/util/converter/StringToFloatConverter.java
index be592665cf..aeeeffcb8b 100644
--- a/server/src/main/java/com/vaadin/data/util/converter/StringToFloatConverter.java
+++ b/server/src/main/java/com/vaadin/data/util/converter/StringToFloatConverter.java
@@ -47,8 +47,9 @@ public class StringToFloatConverter
     }
 
     @Override
-    public Result<Float> convertToModel(String value, Locale locale) {
-        Result<Number> n = convertToNumber(value, locale);
+    public Result<Float> convertToModel(String value, ValueContext context) {
+        Result<Number> n = convertToNumber(value,
+                context.getLocale().orElse(null));
 
         return n.map(number -> {
             if (number == null) {
diff --git a/server/src/main/java/com/vaadin/data/util/converter/StringToIntegerConverter.java b/server/src/main/java/com/vaadin/data/util/converter/StringToIntegerConverter.java
index ec05647a51..1c98e54c6e 100644
--- a/server/src/main/java/com/vaadin/data/util/converter/StringToIntegerConverter.java
+++ b/server/src/main/java/com/vaadin/data/util/converter/StringToIntegerConverter.java
@@ -63,8 +63,9 @@ public class StringToIntegerConverter
     }
 
     @Override
-    public Result<Integer> convertToModel(String value, Locale locale) {
-        Result<Number> n = convertToNumber(value, locale);
+    public Result<Integer> convertToModel(String value, ValueContext context) {
+        Result<Number> n = convertToNumber(value,
+                context.getLocale().orElse(null));
         return n.flatMap(number -> {
             if (number == null) {
                 return Result.ok(null);
diff --git a/server/src/main/java/com/vaadin/data/util/converter/StringToLongConverter.java b/server/src/main/java/com/vaadin/data/util/converter/StringToLongConverter.java
index 9b7bfa4fc6..444e7ede8e 100644
--- a/server/src/main/java/com/vaadin/data/util/converter/StringToLongConverter.java
+++ b/server/src/main/java/com/vaadin/data/util/converter/StringToLongConverter.java
@@ -62,8 +62,9 @@ public class StringToLongConverter
     }
 
     @Override
-    public Result<Long> convertToModel(String value, Locale locale) {
-        Result<Number> n = convertToNumber(value, locale);
+    public Result<Long> convertToModel(String value, ValueContext context) {
+        Result<Number> n = convertToNumber(value,
+                context.getLocale().orElse(null));
         return n.map(number -> {
             if (number == null) {
                 return null;
diff --git a/server/src/main/java/com/vaadin/data/util/converter/ValueContext.java b/server/src/main/java/com/vaadin/data/util/converter/ValueContext.java
new file mode 100644
index 0000000000..a8fdf296f5
--- /dev/null
+++ b/server/src/main/java/com/vaadin/data/util/converter/ValueContext.java
@@ -0,0 +1,103 @@
+/*
+ * Copyright 2000-2016 Vaadin Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+package com.vaadin.data.util.converter;
+
+import java.io.Serializable;
+import java.util.Locale;
+import java.util.Objects;
+import java.util.Optional;
+
+import com.vaadin.ui.Component;
+import com.vaadin.ui.UI;
+
+/**
+ * Value context for {@code Converter}s. Contains relevant information for
+ * converting values.
+ *
+ * @author Vaadin Ltd.
+ * @since
+ */
+public class ValueContext implements Serializable {
+
+    private final Component component;
+    private final Locale locale;
+
+    /**
+     * Constructor for {@code ValueContext} without a {@code Locale}.
+     */
+    public ValueContext() {
+        this.locale = null;
+        this.component = null;
+    }
+
+    /**
+     * Constructor for {@code ValueContext} without a {@code Component}.
+     *
+     * @param locale
+     *            The locale used with conversion. Can be null.
+     */
+    public ValueContext(Locale locale) {
+        this.component = null;
+        this.locale = locale;
+    }
+
+    /**
+     * Constructor for {@code ValueContext}.
+     *
+     * @param component
+     *            The component related to current value. Can be null.
+     */
+    public ValueContext(Component component) {
+        Objects.requireNonNull(component,
+                "Component can't be null in ValueContext construction");
+        this.component = component;
+        this.locale = findLocale();
+    }
+
+    private Locale findLocale() {
+        Locale l = null;
+        if (component != null) {
+            l = component.getLocale();
+        }
+        if (l == null && UI.getCurrent() != null) {
+            l = UI.getCurrent().getLocale();
+        }
+        if (l == null) {
+            l = Locale.getDefault();
+        }
+        return l;
+    }
+
+    /**
+     * Returns an {@code Optional} for the {@code Component} related to value
+     * conversion.
+     *
+     * @return the optional of component
+     */
+    public Optional<Component> getComponent() {
+        return Optional.ofNullable(component);
+    }
+
+    /**
+     * Returns an {@code Optional} for the {@code Locale} used in the value
+     * conversion.
+     *
+     * @return the optional of locale
+     */
+    public Optional<Locale> getLocale() {
+        return Optional.ofNullable(locale);
+    }
+}
diff --git a/server/src/main/java/com/vaadin/ui/declarative/DesignAttributeHandler.java b/server/src/main/java/com/vaadin/ui/declarative/DesignAttributeHandler.java
index 4290620051..4d655e0cbf 100644
--- a/server/src/main/java/com/vaadin/ui/declarative/DesignAttributeHandler.java
+++ b/server/src/main/java/com/vaadin/ui/declarative/DesignAttributeHandler.java
@@ -37,6 +37,7 @@ import org.jsoup.nodes.Element;
 import org.jsoup.nodes.Node;
 
 import com.vaadin.data.util.converter.Converter;
+import com.vaadin.data.util.converter.ValueContext;
 import com.vaadin.shared.ui.AlignmentInfo;
 import com.vaadin.shared.util.SharedUtil;
 import com.vaadin.ui.Alignment;
@@ -398,7 +399,7 @@ public class DesignAttributeHandler implements Serializable {
         Converter<String, Object> converter = (Converter<String, Object>) getFormatter()
                 .findConverterFor(sourceType);
         if (converter != null) {
-            return converter.convertToPresentation(value, null);
+            return converter.convertToPresentation(value, new ValueContext());
         } else {
             return value.toString();
         }
diff --git a/server/src/main/java/com/vaadin/ui/declarative/DesignFormatter.java b/server/src/main/java/com/vaadin/ui/declarative/DesignFormatter.java
index 64430470d4..78c3886dd6 100644
--- a/server/src/main/java/com/vaadin/ui/declarative/DesignFormatter.java
+++ b/server/src/main/java/com/vaadin/ui/declarative/DesignFormatter.java
@@ -36,6 +36,7 @@ import com.vaadin.data.util.converter.Converter;
 import com.vaadin.data.util.converter.StringToBigDecimalConverter;
 import com.vaadin.data.util.converter.StringToDoubleConverter;
 import com.vaadin.data.util.converter.StringToFloatConverter;
+import com.vaadin.data.util.converter.ValueContext;
 import com.vaadin.event.ShortcutAction;
 import com.vaadin.server.Resource;
 import com.vaadin.ui.declarative.converters.DesignDateConverter;
@@ -88,12 +89,14 @@ public class DesignFormatter implements Serializable {
         Converter<String, Boolean> booleanConverter = new Converter<String, Boolean>() {
 
             @Override
-            public Result<Boolean> convertToModel(String value, Locale locale) {
+            public Result<Boolean> convertToModel(String value,
+                    ValueContext context) {
                 return Result.ok(!value.equalsIgnoreCase("false"));
             }
 
             @Override
-            public String convertToPresentation(Boolean value, Locale locale) {
+            public String convertToPresentation(Boolean value,
+                    ValueContext context) {
                 if (value.booleanValue()) {
                     return "";
                 } else {
@@ -146,12 +149,14 @@ public class DesignFormatter implements Serializable {
         converterMap.put(String.class, new Converter<String, String>() {
 
             @Override
-            public Result<String> convertToModel(String value, Locale locale) {
+            public Result<String> convertToModel(String value,
+                    ValueContext context) {
                 return Result.ok(value);
             }
 
             @Override
-            public String convertToPresentation(String value, Locale locale) {
+            public String convertToPresentation(String value,
+                    ValueContext context) {
                 return value;
             }
 
@@ -163,7 +168,7 @@ public class DesignFormatter implements Serializable {
 
             @Override
             public Result<Character> convertToModel(String value,
-                    Locale locale) {
+                    ValueContext context) {
                 return Result.ok(value.charAt(0));
             }
 
@@ -226,7 +231,8 @@ public class DesignFormatter implements Serializable {
     public <T> T parse(String value, Class<? extends T> type) {
         Converter<String, T> converter = findConverterFor(type);
         if (converter != null) {
-            Result<T> result = converter.convertToModel(value, null);
+            Result<T> result = converter.convertToModel(value,
+                    new ValueContext());
             return result.getOrThrow(msg -> new IllegalArgumentException(msg));
         } else {
             return null;
@@ -262,7 +268,7 @@ public class DesignFormatter implements Serializable {
         } else {
             Converter<String, Object> converter = findConverterFor(
                     object.getClass());
-            return converter.convertToPresentation(object, null);
+            return converter.convertToPresentation(object, new ValueContext());
         }
     }
 
diff --git a/server/src/main/java/com/vaadin/ui/declarative/converters/DesignDateConverter.java b/server/src/main/java/com/vaadin/ui/declarative/converters/DesignDateConverter.java
index 9f97ea6ac9..9ccdea4ba3 100644
--- a/server/src/main/java/com/vaadin/ui/declarative/converters/DesignDateConverter.java
+++ b/server/src/main/java/com/vaadin/ui/declarative/converters/DesignDateConverter.java
@@ -18,10 +18,10 @@ package com.vaadin.ui.declarative.converters;
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
 import java.util.Date;
-import java.util.Locale;
 
 import com.vaadin.data.Result;
 import com.vaadin.data.util.converter.Converter;
+import com.vaadin.data.util.converter.ValueContext;
 import com.vaadin.ui.declarative.DesignAttributeHandler;
 
 /**
@@ -34,7 +34,7 @@ import com.vaadin.ui.declarative.DesignAttributeHandler;
 public class DesignDateConverter implements Converter<String, Date> {
 
     @Override
-    public Result<Date> convertToModel(String value, Locale locale) {
+    public Result<Date> convertToModel(String value, ValueContext context) {
         for (String pattern : new String[] { "yyyy-MM-dd HH:mm:ssZ",
                 "yyyy-MM-dd HH:mm:ss", "yyyy-MM-dd HH:mm", "yyyy-MM-dd HH",
                 "yyyy-MM-dd", "yyyy-MM", "yyyy" }) {
@@ -48,7 +48,7 @@ public class DesignDateConverter implements Converter<String, Date> {
     }
 
     @Override
-    public String convertToPresentation(Date value, Locale locale) {
+    public String convertToPresentation(Date value, ValueContext context) {
         return new SimpleDateFormat("yyyy-MM-dd HH:mm:ssZ").format(value);
     }
 
diff --git a/server/src/main/java/com/vaadin/ui/declarative/converters/DesignEnumConverter.java b/server/src/main/java/com/vaadin/ui/declarative/converters/DesignEnumConverter.java
index 5a2c3f340c..d5b3c9a9cd 100644
--- a/server/src/main/java/com/vaadin/ui/declarative/converters/DesignEnumConverter.java
+++ b/server/src/main/java/com/vaadin/ui/declarative/converters/DesignEnumConverter.java
@@ -19,6 +19,7 @@ import java.util.Locale;
 
 import com.vaadin.data.Result;
 import com.vaadin.data.util.converter.Converter;
+import com.vaadin.data.util.converter.ValueContext;
 import com.vaadin.ui.declarative.DesignAttributeHandler;
 
 /**
@@ -46,7 +47,7 @@ public class DesignEnumConverter<T extends Enum>
 
     @SuppressWarnings("unchecked")
     @Override
-    public Result<T> convertToModel(String value, Locale locale) {
+    public Result<T> convertToModel(String value, ValueContext context) {
         if (value == null || value.trim().equals("")) {
             return Result.ok(null);
         }
@@ -60,7 +61,7 @@ public class DesignEnumConverter<T extends Enum>
     }
 
     @Override
-    public String convertToPresentation(T value, Locale locale) {
+    public String convertToPresentation(T value, ValueContext context) {
         if (value == null) {
             return null;
         }
diff --git a/server/src/main/java/com/vaadin/ui/declarative/converters/DesignLocalDateConverter.java b/server/src/main/java/com/vaadin/ui/declarative/converters/DesignLocalDateConverter.java
index 188516b431..59301ef386 100644
--- a/server/src/main/java/com/vaadin/ui/declarative/converters/DesignLocalDateConverter.java
+++ b/server/src/main/java/com/vaadin/ui/declarative/converters/DesignLocalDateConverter.java
@@ -22,6 +22,7 @@ import java.util.Locale;
 
 import com.vaadin.data.Result;
 import com.vaadin.data.util.converter.Converter;
+import com.vaadin.data.util.converter.ValueContext;
 import com.vaadin.ui.declarative.DesignAttributeHandler;
 
 /**
@@ -34,12 +35,13 @@ import com.vaadin.ui.declarative.DesignAttributeHandler;
 public class DesignLocalDateConverter implements Converter<String, LocalDate> {
 
     @Override
-    public Result<LocalDate> convertToModel(String value, Locale locale) {
+    public Result<LocalDate> convertToModel(String value,
+            ValueContext context) {
         for (String pattern : new String[] { "yyyy-MM-dd", "yyyy-MM",
                 "yyyy" }) {
             try {
-                Locale effectiveLocale = locale == null ? Locale.ENGLISH
-                        : locale;
+                Locale effectiveLocale = context.getLocale()
+                        .orElse(Locale.ENGLISH);
                 LocalDate date = DateTimeFormatter
                         .ofPattern(pattern, effectiveLocale)
                         .parse(value, LocalDate::from);
@@ -52,9 +54,11 @@ public class DesignLocalDateConverter implements Converter<String, LocalDate> {
     }
 
     @Override
-    public String convertToPresentation(LocalDate value, Locale locale) {
-        return DateTimeFormatter.ofPattern("yyyy-MM-dd",
-                locale == null ? Locale.ENGLISH : locale).format(value);
+    public String convertToPresentation(LocalDate value, ValueContext context) {
+        return DateTimeFormatter
+                .ofPattern("yyyy-MM-dd",
+                        context.getLocale().orElse(Locale.ENGLISH))
+                .format(value);
     }
 
 }
diff --git a/server/src/main/java/com/vaadin/ui/declarative/converters/DesignObjectConverter.java b/server/src/main/java/com/vaadin/ui/declarative/converters/DesignObjectConverter.java
index d8fcfbad71..cf1c1ef69a 100644
--- a/server/src/main/java/com/vaadin/ui/declarative/converters/DesignObjectConverter.java
+++ b/server/src/main/java/com/vaadin/ui/declarative/converters/DesignObjectConverter.java
@@ -15,10 +15,9 @@
  */
 package com.vaadin.ui.declarative.converters;
 
-import java.util.Locale;
-
 import com.vaadin.data.Result;
 import com.vaadin.data.util.converter.Converter;
+import com.vaadin.data.util.converter.ValueContext;
 import com.vaadin.ui.declarative.DesignAttributeHandler;
 
 /**
@@ -31,12 +30,12 @@ import com.vaadin.ui.declarative.DesignAttributeHandler;
 public class DesignObjectConverter implements Converter<String, Object> {
 
     @Override
-    public Result<Object> convertToModel(String value, Locale locale) {
+    public Result<Object> convertToModel(String value, ValueContext context) {
         return Result.ok(value);
     }
 
     @Override
-    public String convertToPresentation(Object value, Locale locale) {
+    public String convertToPresentation(Object value, ValueContext context) {
         if (value == null) {
             return null;
         }
diff --git a/server/src/main/java/com/vaadin/ui/declarative/converters/DesignResourceConverter.java b/server/src/main/java/com/vaadin/ui/declarative/converters/DesignResourceConverter.java
index 1efc382fcc..ef6e10ef5c 100644
--- a/server/src/main/java/com/vaadin/ui/declarative/converters/DesignResourceConverter.java
+++ b/server/src/main/java/com/vaadin/ui/declarative/converters/DesignResourceConverter.java
@@ -23,6 +23,7 @@ import java.util.Map;
 
 import com.vaadin.data.Result;
 import com.vaadin.data.util.converter.Converter;
+import com.vaadin.data.util.converter.ValueContext;
 import com.vaadin.server.ExternalResource;
 import com.vaadin.server.FileResource;
 import com.vaadin.server.FontAwesome;
@@ -44,7 +45,7 @@ import com.vaadin.ui.declarative.DesignAttributeHandler;
 public class DesignResourceConverter implements Converter<String, Resource> {
 
     @Override
-    public Result<Resource> convertToModel(String value, Locale locale) {
+    public Result<Resource> convertToModel(String value, ValueContext context) {
         if (!value.contains("://")) {
             // assume it'is "file://" protocol, one that is used to access a
             // file on a given path on the server, this will later be striped
@@ -63,7 +64,7 @@ public class DesignResourceConverter implements Converter<String, Resource> {
     }
 
     @Override
-    public String convertToPresentation(Resource value, Locale locale) {
+    public String convertToPresentation(Resource value, ValueContext context) {
         ResourceConverterByProtocol byType = ResourceConverterByProtocol
                 .byType(value.getClass());
         if (byType != null) {
diff --git a/server/src/main/java/com/vaadin/ui/declarative/converters/DesignShortcutActionConverter.java b/server/src/main/java/com/vaadin/ui/declarative/converters/DesignShortcutActionConverter.java
index 2468c29c8c..4856a0db8f 100644
--- a/server/src/main/java/com/vaadin/ui/declarative/converters/DesignShortcutActionConverter.java
+++ b/server/src/main/java/com/vaadin/ui/declarative/converters/DesignShortcutActionConverter.java
@@ -17,12 +17,12 @@ package com.vaadin.ui.declarative.converters;
 
 import java.util.Collections;
 import java.util.HashMap;
-import java.util.Locale;
 import java.util.Map;
 import java.util.Map.Entry;
 
 import com.vaadin.data.Result;
 import com.vaadin.data.util.converter.Converter;
+import com.vaadin.data.util.converter.ValueContext;
 import com.vaadin.event.ShortcutAction;
 import com.vaadin.event.ShortcutAction.KeyCode;
 import com.vaadin.event.ShortcutAction.ModifierKey;
@@ -121,7 +121,8 @@ public class DesignShortcutActionConverter
     }
 
     @Override
-    public Result<ShortcutAction> convertToModel(String value, Locale locale) {
+    public Result<ShortcutAction> convertToModel(String value,
+            ValueContext context) {
         if (value.length() == 0) {
             return Result.ok(null);
         }
@@ -159,7 +160,8 @@ public class DesignShortcutActionConverter
     }
 
     @Override
-    public String convertToPresentation(ShortcutAction value, Locale locale) {
+    public String convertToPresentation(ShortcutAction value,
+            ValueContext context) {
         StringBuilder sb = new StringBuilder();
         // handle modifiers
         if (value.getModifiers() != null) {
diff --git a/server/src/main/java/com/vaadin/ui/declarative/converters/DesignTimeZoneConverter.java b/server/src/main/java/com/vaadin/ui/declarative/converters/DesignTimeZoneConverter.java
index d0b2622015..3fe034e5fd 100644
--- a/server/src/main/java/com/vaadin/ui/declarative/converters/DesignTimeZoneConverter.java
+++ b/server/src/main/java/com/vaadin/ui/declarative/converters/DesignTimeZoneConverter.java
@@ -15,11 +15,11 @@
  */
 package com.vaadin.ui.declarative.converters;
 
-import java.util.Locale;
 import java.util.TimeZone;
 
 import com.vaadin.data.Result;
 import com.vaadin.data.util.converter.Converter;
+import com.vaadin.data.util.converter.ValueContext;
 import com.vaadin.ui.declarative.DesignAttributeHandler;
 
 /**
@@ -32,7 +32,7 @@ import com.vaadin.ui.declarative.DesignAttributeHandler;
 public class DesignTimeZoneConverter implements Converter<String, TimeZone> {
 
     @Override
-    public Result<TimeZone> convertToModel(String value, Locale locale) {
+    public Result<TimeZone> convertToModel(String value, ValueContext context) {
         if (value == null || value.isEmpty()) {
             return Result.ok(null);
         }
@@ -41,7 +41,7 @@ public class DesignTimeZoneConverter implements Converter<String, TimeZone> {
     }
 
     @Override
-    public String convertToPresentation(TimeZone value, Locale locale) {
+    public String convertToPresentation(TimeZone value, ValueContext context) {
         if (value == null) {
             return "";
         } else {
diff --git a/server/src/main/java/com/vaadin/ui/declarative/converters/DesignToStringConverter.java b/server/src/main/java/com/vaadin/ui/declarative/converters/DesignToStringConverter.java
index d1564e0b8f..fa81b36bb7 100644
--- a/server/src/main/java/com/vaadin/ui/declarative/converters/DesignToStringConverter.java
+++ b/server/src/main/java/com/vaadin/ui/declarative/converters/DesignToStringConverter.java
@@ -16,10 +16,10 @@
 package com.vaadin.ui.declarative.converters;
 
 import java.lang.reflect.InvocationTargetException;
-import java.util.Locale;
 
 import com.vaadin.data.Result;
 import com.vaadin.data.util.converter.Converter;
+import com.vaadin.data.util.converter.ValueContext;
 import com.vaadin.ui.declarative.DesignAttributeHandler;
 
 /**
@@ -72,7 +72,7 @@ public class DesignToStringConverter<TYPE> implements Converter<String, TYPE> {
     }
 
     @Override
-    public Result<TYPE> convertToModel(String value, Locale locale) {
+    public Result<TYPE> convertToModel(String value, ValueContext context) {
         try {
             return Result.ok(type
                     .cast(type.getMethod(this.staticMethodName, String.class)
@@ -85,7 +85,7 @@ public class DesignToStringConverter<TYPE> implements Converter<String, TYPE> {
     }
 
     @Override
-    public String convertToPresentation(TYPE value, Locale locale) {
+    public String convertToPresentation(TYPE value, ValueContext context) {
         if (value == null) {
             return NULL_VALUE_REPRESENTATION;
         } else {