Change declarative support to use new converters

Change-Id: I3bb2c106a4c4d8556f6f752867da1917e0d3c9a3

10 files changed, 113 insertions, 237 deletions

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 f6607c91e4..ba5c279ed1 100644
--- a/server/src/main/java/com/vaadin/ui/declarative/DesignAttributeHandler.java
+++ b/server/src/main/java/com/vaadin/ui/declarative/DesignAttributeHandler.java
@@ -36,10 +36,10 @@ import org.jsoup.nodes.Attributes;
 import org.jsoup.nodes.Element;
 import org.jsoup.nodes.Node;
 
+import com.vaadin.data.util.converter.Converter;
 import com.vaadin.shared.ui.AlignmentInfo;
 import com.vaadin.shared.util.SharedUtil;
 import com.vaadin.ui.Alignment;
-import com.vaadin.v7.data.util.converter.Converter;
 
 /**
  * Default attribute handler implementation used when parsing designs to
@@ -379,10 +379,11 @@ public class DesignAttributeHandler implements Serializable {
             // value is not null. How to represent null value in attributes?
             return "";
         }
-        Converter<String, Object> converter = getFormatter()
+        @SuppressWarnings("unchecked")
+        Converter<String, Object> converter = (Converter<String, Object>) getFormatter()
                 .findConverterFor(sourceType);
         if (converter != null) {
-            return converter.convertToPresentation(value, String.class, null);
+            return converter.convertToPresentation(value, null);
         } 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 d8e131a047..7414c0b1e7 100644
--- a/server/src/main/java/com/vaadin/ui/declarative/DesignFormatter.java
+++ b/server/src/main/java/com/vaadin/ui/declarative/DesignFormatter.java
@@ -30,6 +30,11 @@ import java.util.concurrent.ConcurrentHashMap;
 
 import org.jsoup.parser.Parser;
 
+import com.vaadin.data.Result;
+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.event.ShortcutAction;
 import com.vaadin.server.Resource;
 import com.vaadin.ui.declarative.converters.DesignDateConverter;
@@ -39,10 +44,6 @@ import com.vaadin.ui.declarative.converters.DesignResourceConverter;
 import com.vaadin.ui.declarative.converters.DesignShortcutActionConverter;
 import com.vaadin.ui.declarative.converters.DesignTimeZoneConverter;
 import com.vaadin.ui.declarative.converters.DesignToStringConverter;
-import com.vaadin.v7.data.util.converter.Converter;
-import com.vaadin.v7.data.util.converter.StringToBigDecimalConverter;
-import com.vaadin.v7.data.util.converter.StringToDoubleConverter;
-import com.vaadin.v7.data.util.converter.StringToFloatConverter;
 
 /**
  * Class focused on flexible and consistent formatting and parsing of different
@@ -55,7 +56,6 @@ import com.vaadin.v7.data.util.converter.StringToFloatConverter;
 public class DesignFormatter implements Serializable {
 
     private final Map<Class<?>, Converter<String, ?>> converterMap = new ConcurrentHashMap<Class<?>, Converter<String, ?>>();
-    private final Converter<String, Enum> stringEnumConverter = new DesignEnumConverter();
     private final Converter<String, Object> stringObjectConverter = new DesignObjectConverter();
 
     /**
@@ -86,16 +86,12 @@ public class DesignFormatter implements Serializable {
         Converter<String, Boolean> booleanConverter = new Converter<String, Boolean>() {
 
             @Override
-            public Boolean convertToModel(String value,
-                    Class<? extends Boolean> targetType, Locale locale)
-                    throws Converter.ConversionException {
-                return !value.equalsIgnoreCase("false");
+            public Result<Boolean> convertToModel(String value, Locale locale) {
+                return Result.ok(!value.equalsIgnoreCase("false"));
             }
 
             @Override
-            public String convertToPresentation(Boolean value,
-                    Class<? extends String> targetType, Locale locale)
-                    throws Converter.ConversionException {
+            public String convertToPresentation(Boolean value, Locale locale) {
                 if (value.booleanValue()) {
                     return "";
                 } else {
@@ -103,16 +99,6 @@ public class DesignFormatter implements Serializable {
                 }
             }
 
-            @Override
-            public Class<Boolean> getModelType() {
-                return Boolean.class;
-            }
-
-            @Override
-            public Class<String> getPresentationType() {
-                return String.class;
-            }
-
         };
         converterMap.put(Boolean.class, booleanConverter);
         converterMap.put(boolean.class, booleanConverter);
@@ -144,41 +130,26 @@ public class DesignFormatter implements Serializable {
         final DecimalFormat bigDecimalFmt = new DecimalFormat("0.###", symbols);
         bigDecimalFmt.setGroupingUsed(false);
         bigDecimalFmt.setParseBigDecimal(true);
-        converterMap.put(BigDecimal.class,
-                new StringToBigDecimalConverter() {
-                    @Override
-                    protected NumberFormat getFormat(Locale locale) {
-                        return bigDecimalFmt;
-                    };
-                });
+        converterMap.put(BigDecimal.class, new StringToBigDecimalConverter() {
+            @Override
+            protected NumberFormat getFormat(Locale locale) {
+                return bigDecimalFmt;
+            };
+        });
 
         // strings do nothing
         converterMap.put(String.class, new Converter<String, String>() {
 
             @Override
-            public String convertToModel(String value,
-                    Class<? extends String> targetType, Locale locale)
-                    throws Converter.ConversionException {
-                return value;
+            public Result<String> convertToModel(String value, Locale locale) {
+                return Result.ok(value);
             }
 
             @Override
-            public String convertToPresentation(String value,
-                    Class<? extends String> targetType, Locale locale)
-                    throws Converter.ConversionException {
+            public String convertToPresentation(String value, Locale locale) {
                 return value;
             }
 
-            @Override
-            public Class<String> getModelType() {
-                return String.class;
-            }
-
-            @Override
-            public Class<String> getPresentationType() {
-                return String.class;
-            }
-
         });
 
         // char takes the first character from the string
@@ -186,10 +157,9 @@ public class DesignFormatter implements Serializable {
                 Character.class) {
 
             @Override
-            public Character convertToModel(String value,
-                    Class<? extends Character> targetType, Locale locale)
-                    throws Converter.ConversionException {
-                return value.charAt(0);
+            public Result<Character> convertToModel(String value,
+                    Locale locale) {
+                return Result.ok(value.charAt(0));
             }
 
         };
@@ -204,16 +174,6 @@ public class DesignFormatter implements Serializable {
     }
 
     /**
-     * Adds a converter for a new type.
-     *
-     * @param converter
-     *            Converter to add.
-     */
-    protected <T> void addConverter(Converter<String, T> converter) {
-        converterMap.put(converter.getModelType(), converter);
-    }
-
-    /**
      * Adds a converter for a given type.
      *
      * @param type
@@ -248,7 +208,7 @@ public class DesignFormatter implements Serializable {
     }
 
     /**
-     * Parses a given string as a value of given type
+     * Parses a given string as a value of given type.
      *
      * @param value
      *            String value to convert.
@@ -260,7 +220,8 @@ public class DesignFormatter implements Serializable {
     public <T> T parse(String value, Class<? extends T> type) {
         Converter<String, T> converter = findConverterFor(type);
         if (converter != null) {
-            return converter.convertToModel(value, type, null);
+            Result<T> result = converter.convertToModel(value, null);
+            return result.getOrThrow(msg -> new IllegalArgumentException(msg));
         } else {
             return null;
         }
@@ -295,7 +256,7 @@ public class DesignFormatter implements Serializable {
         } else {
             Converter<String, Object> converter = findConverterFor(
                     object.getClass());
-            return converter.convertToPresentation(object, String.class, null);
+            return converter.convertToPresentation(object, null);
         }
     }
 
@@ -325,7 +286,7 @@ public class DesignFormatter implements Serializable {
      * @return A valid converter for a given type or its supertype, <b>null</b>
      *         if it was not found.
      */
-    @SuppressWarnings("unchecked")
+    @SuppressWarnings({ "unchecked", "rawtypes" })
     protected <T> Converter<String, T> findConverterFor(
             Class<? extends T> sourceType, boolean strict) {
         if (sourceType == Object.class) {
@@ -340,14 +301,13 @@ public class DesignFormatter implements Serializable {
         } else if (!strict) {
             for (Class<?> supported : converterMap.keySet()) {
                 if (supported.isAssignableFrom(sourceType)) {
-                    return ((Converter<String, T>) converterMap
-                            .get(supported));
+                    return ((Converter<String, T>) converterMap.get(supported));
                 }
             }
         }
 
         if (sourceType.isEnum()) {
-            return (Converter<String, T>) stringEnumConverter;
+            return new DesignEnumConverter(sourceType);
         }
         return null;
     }
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 d2b8233da4..9f97ea6ac9 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
@@ -20,8 +20,9 @@ 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.ui.declarative.DesignAttributeHandler;
-import com.vaadin.v7.data.util.converter.Converter;
 
 /**
  * A date converter to be used by {@link DesignAttributeHandler}. Provides
@@ -33,35 +34,22 @@ import com.vaadin.v7.data.util.converter.Converter;
 public class DesignDateConverter implements Converter<String, Date> {
 
     @Override
-    public Date convertToModel(String value, Class<? extends Date> targetType,
-            Locale locale) throws Converter.ConversionException {
+    public Result<Date> convertToModel(String value, Locale locale) {
         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" }) {
             try {
-                return new SimpleDateFormat(pattern).parse(value);
+                return Result.ok(new SimpleDateFormat(pattern).parse(value));
             } catch (ParseException e) {
                 // not parseable, ignore and try another format
             }
         }
-        return null;
+        return Result.error("Could not parse date value: " + value);
     }
 
     @Override
-    public String convertToPresentation(Date value,
-            Class<? extends String> targetType, Locale locale)
-            throws Converter.ConversionException {
+    public String convertToPresentation(Date value, Locale locale) {
         return new SimpleDateFormat("yyyy-MM-dd HH:mm:ssZ").format(value);
     }
 
-    @Override
-    public Class<Date> getModelType() {
-        return Date.class;
-    }
-
-    @Override
-    public Class<String> getPresentationType() {
-        return String.class;
-    }
-
 }
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 4424c6c66f..5a2c3f340c 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
@@ -17,8 +17,9 @@ 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.ui.declarative.DesignAttributeHandler;
-import com.vaadin.v7.data.util.converter.Converter;
 
 /**
  * An converter for Enum to/from String for {@link DesignAttributeHandler} to
@@ -27,22 +28,39 @@ import com.vaadin.v7.data.util.converter.Converter;
  * @since 7.4
  * @author Vaadin Ltd
  */
-public class DesignEnumConverter implements Converter<String, Enum> {
+@SuppressWarnings("rawtypes")
+public class DesignEnumConverter<T extends Enum>
+        implements Converter<String, T> {
 
+    private Class<T> type;
+
+    /**
+     * Creates a converter for the given enum type.
+     *
+     * @param type
+     *            the enum type to convert to/from
+     */
+    public DesignEnumConverter(Class<T> type) {
+        this.type = type;
+    }
+
+    @SuppressWarnings("unchecked")
     @Override
-    public Enum convertToModel(String value, Class<? extends Enum> targetType,
-            Locale locale)
-            throws com.vaadin.v7.data.util.converter.Converter.ConversionException {
+    public Result<T> convertToModel(String value, Locale locale) {
         if (value == null || value.trim().equals("")) {
-            return null;
+            return Result.ok(null);
+        }
+        try {
+            T result = (T) Enum.valueOf(type,
+                    value.toUpperCase(Locale.ENGLISH));
+            return Result.ok(result);
+        } catch (Exception e) {
+            return Result.error(e.getMessage());
         }
-        return Enum.valueOf(targetType, value.toUpperCase(Locale.ENGLISH));
     }
 
     @Override
-    public String convertToPresentation(Enum value,
-            Class<? extends String> targetType, Locale locale)
-            throws com.vaadin.v7.data.util.converter.Converter.ConversionException {
+    public String convertToPresentation(T value, Locale locale) {
         if (value == null) {
             return null;
         }
@@ -50,14 +68,4 @@ public class DesignEnumConverter implements Converter<String, Enum> {
         return value.name().toLowerCase(Locale.ENGLISH);
     }
 
-    @Override
-    public Class<Enum> getModelType() {
-        return Enum.class;
-    }
-
-    @Override
-    public Class<String> getPresentationType() {
-        return String.class;
-    }
-
 }
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 22d44a1fb5..d8fcfbad71 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
@@ -17,8 +17,9 @@ 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.ui.declarative.DesignAttributeHandler;
-import com.vaadin.v7.data.util.converter.Converter;
 
 /**
  * An converter for Object to/from String for {@link DesignAttributeHandler} to
@@ -30,16 +31,12 @@ import com.vaadin.v7.data.util.converter.Converter;
 public class DesignObjectConverter implements Converter<String, Object> {
 
     @Override
-    public Object convertToModel(String value,
-            Class<? extends Object> targetType, Locale locale)
-            throws com.vaadin.v7.data.util.converter.Converter.ConversionException {
-        return value;
+    public Result<Object> convertToModel(String value, Locale locale) {
+        return Result.ok(value);
     }
 
     @Override
-    public String convertToPresentation(Object value,
-            Class<? extends String> targetType, Locale locale)
-            throws com.vaadin.v7.data.util.converter.Converter.ConversionException {
+    public String convertToPresentation(Object value, Locale locale) {
         if (value == null) {
             return null;
         }
@@ -47,14 +44,4 @@ public class DesignObjectConverter implements Converter<String, Object> {
         return value.toString();
     }
 
-    @Override
-    public Class<Object> getModelType() {
-        return Object.class;
-    }
-
-    @Override
-    public Class<String> getPresentationType() {
-        return String.class;
-    }
-
 }
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 a55cfd070b..23f21b4eda 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
@@ -21,6 +21,8 @@ import java.util.HashMap;
 import java.util.Locale;
 import java.util.Map;
 
+import com.vaadin.data.Result;
+import com.vaadin.data.util.converter.Converter;
 import com.vaadin.server.ExternalResource;
 import com.vaadin.server.FileResource;
 import com.vaadin.server.FontAwesome;
@@ -30,7 +32,7 @@ import com.vaadin.server.Resource;
 import com.vaadin.server.ResourceReference;
 import com.vaadin.server.ThemeResource;
 import com.vaadin.ui.declarative.DesignAttributeHandler;
-import com.vaadin.v7.data.util.converter.Converter;
+import com.vaadin.v7.data.util.converter.Converter.ConversionException;
 
 /**
  * A converter for {@link Resource} implementations supported by
@@ -40,13 +42,10 @@ import com.vaadin.v7.data.util.converter.Converter;
  * @author Vaadin Ltd
  */
 @SuppressWarnings("serial")
-public class DesignResourceConverter
-        implements Converter<String, Resource> {
+public class DesignResourceConverter implements Converter<String, Resource> {
 
     @Override
-    public Resource convertToModel(String value,
-            Class<? extends Resource> targetType, Locale locale)
-            throws Converter.ConversionException {
+    public Result<Resource> convertToModel(String value, Locale locale) {
         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
@@ -58,37 +57,24 @@ public class DesignResourceConverter
         try {
             ResourceConverterByProtocol converter = ResourceConverterByProtocol
                     .valueOf(protocol.toUpperCase(Locale.ENGLISH));
-            return converter.parse(value);
+            return Result.ok(converter.parse(value));
         } catch (IllegalArgumentException iae) {
-            throw new ConversionException("Unrecognized protocol: " + protocol,
-                    iae);
+            return Result.error("Unrecognized protocol: " + protocol);
         }
     }
 
     @Override
-    public String convertToPresentation(Resource value,
-            Class<? extends String> targetType, Locale locale)
-            throws Converter.ConversionException {
+    public String convertToPresentation(Resource value, Locale locale) {
         ResourceConverterByProtocol byType = ResourceConverterByProtocol
                 .byType(value.getClass());
         if (byType != null) {
             return byType.format(value);
         } else {
-            throw new Converter.ConversionException(
+            throw new IllegalArgumentException(
                     "unknown Resource type - " + value.getClass().getName());
         }
     }
 
-    @Override
-    public Class<Resource> getModelType() {
-        return Resource.class;
-    }
-
-    @Override
-    public Class<String> getPresentationType() {
-        return String.class;
-    }
-
     private static interface ProtocolResourceConverter extends Serializable {
         public String format(Resource value);
 
@@ -108,8 +94,7 @@ public class DesignResourceConverter
             }
 
             @Override
-            public String format(Resource value)
-                    throws Converter.ConversionException {
+            public String format(Resource value) {
                 return new ResourceReference(value, null, null).getURL();
             }
         },
@@ -138,8 +123,7 @@ public class DesignResourceConverter
             }
 
             @Override
-            public String format(Resource value)
-                    throws Converter.ConversionException {
+            public String format(Resource value) {
                 FontIcon icon = (FontIcon) value;
                 return new ResourceReference(icon, null, null).getURL();
 
@@ -162,8 +146,7 @@ public class DesignResourceConverter
             }
 
             @Override
-            public String format(Resource value)
-                    throws Converter.ConversionException {
+            public String format(Resource value) {
                 throw new UnsupportedOperationException(
                         "Use " + ResourceConverterByProtocol.FONTICON.toString()
                                 + " instead");
@@ -176,8 +159,7 @@ public class DesignResourceConverter
             }
 
             @Override
-            public String format(Resource value)
-                    throws Converter.ConversionException {
+            public String format(Resource value) {
                 String path = ((FileResource) value).getSourceFile().getPath();
                 if (File.separatorChar != '/') {
                     // make sure we use '/' as file separator in templates
@@ -196,8 +178,7 @@ public class DesignResourceConverter
         }
 
         @Override
-        public String format(Resource value)
-                throws Converter.ConversionException {
+        public String format(Resource value) {
             // default behavior for HTTP, HTTPS, FTP and FTPS
             return ((ExternalResource) value).getURL();
         }
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 12d96abb63..fdd61f0489 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
@@ -21,10 +21,11 @@ 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.event.ShortcutAction;
 import com.vaadin.event.ShortcutAction.KeyCode;
 import com.vaadin.event.ShortcutAction.ModifierKey;
-import com.vaadin.v7.data.util.converter.Converter;
 
 /**
  * Converter for {@link ShortcutActions}.
@@ -120,11 +121,9 @@ public class DesignShortcutActionConverter
     }
 
     @Override
-    public ShortcutAction convertToModel(String value,
-            Class<? extends ShortcutAction> targetType, Locale locale)
-            throws Converter.ConversionException {
+    public Result<ShortcutAction> convertToModel(String value, Locale locale) {
         if (value.length() == 0) {
-            return null;
+            return Result.ok(null);
         }
 
         String[] data = value.split(" ", 2);
@@ -152,18 +151,15 @@ public class DesignShortcutActionConverter
                             "Invalid modifier '" + parts[i] + "'");
                 }
             }
-            return new ShortcutAction(data.length == 2 ? data[1] : null,
-                    keyCode, modifiers);
+            return Result.ok(new ShortcutAction(
+                    data.length == 2 ? data[1] : null, keyCode, modifiers));
         } catch (Exception e) {
-            throw new ConversionException("Invalid shortcut '" + value + "'",
-                    e);
+            return Result.error("Invalid shortcut '" + value + "'");
         }
     }
 
     @Override
-    public String convertToPresentation(ShortcutAction value,
-            Class<? extends String> targetType, Locale locale)
-            throws Converter.ConversionException {
+    public String convertToPresentation(ShortcutAction value, Locale locale) {
         StringBuilder sb = new StringBuilder();
         // handle modifiers
         if (value.getModifiers() != null) {
@@ -179,16 +175,6 @@ public class DesignShortcutActionConverter
         return sb.toString();
     }
 
-    @Override
-    public Class<ShortcutAction> getModelType() {
-        return ShortcutAction.class;
-    }
-
-    @Override
-    public Class<String> getPresentationType() {
-        return String.class;
-    }
-
     public int getKeycodeForString(String attributePresentation) {
         Integer code = presentationMap.get(attributePresentation);
         return code != null ? code.intValue() : -1;
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 4ef52d0819..d0b2622015 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
@@ -18,8 +18,9 @@ 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.ui.declarative.DesignAttributeHandler;
-import com.vaadin.v7.data.util.converter.Converter;
 
 /**
  * Utility class for {@link DesignAttributeHandler} that deals with converting
@@ -28,24 +29,19 @@ import com.vaadin.v7.data.util.converter.Converter;
  * @since 7.4
  * @author Vaadin Ltd
  */
-public class DesignTimeZoneConverter
-        implements Converter<String, TimeZone> {
+public class DesignTimeZoneConverter implements Converter<String, TimeZone> {
 
     @Override
-    public TimeZone convertToModel(String value,
-            Class<? extends TimeZone> targetTimeZone, Locale locale)
-            throws Converter.ConversionException {
+    public Result<TimeZone> convertToModel(String value, Locale locale) {
         if (value == null || value.isEmpty()) {
-            return null;
+            return Result.ok(null);
         }
 
-        return TimeZone.getTimeZone(value);
+        return Result.ok(TimeZone.getTimeZone(value));
     }
 
     @Override
-    public String convertToPresentation(TimeZone value,
-            Class<? extends String> targetTimeZone, Locale locale)
-            throws Converter.ConversionException {
+    public String convertToPresentation(TimeZone value, Locale locale) {
         if (value == null) {
             return "";
         } else {
@@ -53,14 +49,4 @@ public class DesignTimeZoneConverter
         }
     }
 
-    @Override
-    public Class<TimeZone> getModelType() {
-        return TimeZone.class;
-    }
-
-    @Override
-    public Class<String> getPresentationType() {
-        return String.class;
-    }
-
 }
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 9127832690..d1564e0b8f 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
@@ -18,8 +18,9 @@ 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.ui.declarative.DesignAttributeHandler;
-import com.vaadin.v7.data.util.converter.Converter;
 
 /**
  * Utility class for {@link DesignAttributeHandler} that deals with converting
@@ -30,8 +31,7 @@ import com.vaadin.v7.data.util.converter.Converter;
  * @param <TYPE>
  *            Type of the data being converted.
  */
-public class DesignToStringConverter<TYPE>
-        implements Converter<String, TYPE> {
+public class DesignToStringConverter<TYPE> implements Converter<String, TYPE> {
 
     private final Class<? extends TYPE> type;
 
@@ -72,30 +72,20 @@ public class DesignToStringConverter<TYPE>
     }
 
     @Override
-    public TYPE convertToModel(String value, Class<? extends TYPE> targetType,
-            Locale locale) throws Converter.ConversionException {
+    public Result<TYPE> convertToModel(String value, Locale locale) {
         try {
-            return type.cast(type.getMethod(this.staticMethodName, String.class)
-                    .invoke(null, value));
-        } catch (IllegalAccessException e) {
-            throw new Converter.ConversionException(e);
-        } catch (IllegalArgumentException e) {
-            throw new Converter.ConversionException(e);
+            return Result.ok(type
+                    .cast(type.getMethod(this.staticMethodName, String.class)
+                            .invoke(null, value)));
         } catch (InvocationTargetException e) {
-            throw new Converter.ConversionException(e.getCause());
-        } catch (NoSuchMethodException e) {
-            throw new Converter.ConversionException(e);
-        } catch (SecurityException e) {
-            throw new Converter.ConversionException(e);
-        } catch (RuntimeException e) {
-            throw new Converter.ConversionException(e);
+            return Result.error(e.getCause().getMessage());
+        } catch (Exception e) {
+            return Result.error(e.getMessage());
         }
     }
 
     @Override
-    public String convertToPresentation(TYPE value,
-            Class<? extends String> targetType, Locale locale)
-            throws Converter.ConversionException {
+    public String convertToPresentation(TYPE value, Locale locale) {
         if (value == null) {
             return NULL_VALUE_REPRESENTATION;
         } else {
@@ -103,14 +93,4 @@ public class DesignToStringConverter<TYPE>
         }
     }
 
-    @Override
-    public Class<TYPE> getModelType() {
-        return (Class<TYPE>) this.type;
-    }
-
-    @Override
-    public Class<String> getPresentationType() {
-        return String.class;
-    }
-
 }
diff --git a/server/src/test/java/com/vaadin/tests/design/DesignFormatterTest.java b/server/src/test/java/com/vaadin/tests/design/DesignFormatterTest.java
index 4c957f7491..b29ddcba7c 100644
--- a/server/src/test/java/com/vaadin/tests/design/DesignFormatterTest.java
+++ b/server/src/test/java/com/vaadin/tests/design/DesignFormatterTest.java
@@ -42,7 +42,6 @@ import com.vaadin.server.ThemeResource;
 import com.vaadin.shared.ApplicationConstants;
 import com.vaadin.shared.util.SharedUtil;
 import com.vaadin.ui.declarative.DesignFormatter;
-import com.vaadin.v7.data.util.converter.Converter.ConversionException;
 
 /**
  * Various tests related to formatter.
@@ -238,7 +237,7 @@ public class DesignFormatterTest {
         try {
             formatter.parse(shortcut, ShortcutAction.class);
             Assert.fail("Invalid shortcut '" + shortcut + "' should throw");
-        } catch (ConversionException e) {
+        } catch (IllegalArgumentException e) {
             // expected
         }
     }
@@ -298,13 +297,13 @@ public class DesignFormatterTest {
                 formatter.format(new FileResource(new File(fileSystemPath))));
     }
 
-    @Test(expected = ConversionException.class)
+    @Test(expected = IllegalArgumentException.class)
     public void testResourceParseException() {
         String someRandomResourceUrl = "random://url";
         formatter.parse(someRandomResourceUrl, Resource.class);
     }
 
-    @Test(expected = ConversionException.class)
+    @Test(expected = IllegalArgumentException.class)
     public void testResourceFormatException() {
         formatter.format(new Resource() { // must use unknown resource type
             @Override