Fix devfile component preferences deserialization through GSON

Signed-off-by: Max Shaposhnik <mshaposh@redhat.com>

core/che-core-api-dto/src/main/java/org/eclipse/che/dto/server/DtoFactory.java

@@ -22,6 +22,7 @@ import com.google.gson.JsonElement;
 import com.google.gson.JsonSyntaxException;
 import com.google.gson.TypeAdapter;
 import com.google.gson.TypeAdapterFactory;
+import com.google.gson.internal.bind.ReflectiveTypeAdapterFactory;
 import com.google.gson.reflect.TypeToken;
 import com.google.gson.stream.JsonReader;
 import com.google.gson.stream.JsonWriter;
@@ -511,6 +512,8 @@ public final class DtoFactory {
       builder.registerTypeHierarchyAdapter(Map.class, new NullOrEmptyMapAdapter());
     }
 
+    builder.registerTypeAdapterFactory(new SerializableInterfaceAdapterFactory());
+
     return builder.create();
   }
 }

core/che-core-api-dto/src/main/java/org/eclipse/che/dto/server/SerializableInterfaceAdapterFactory.java

@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2012-2018 Red Hat, Inc.
+ * This program and the accompanying materials are made
+ * available under the terms of the Eclipse Public License 2.0
+ * which is available at https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *   Red Hat, Inc. - initial API and implementation
+ */
+package org.eclipse.che.dto.server;
+
+import com.google.gson.Gson;
+import com.google.gson.TypeAdapter;
+import com.google.gson.TypeAdapterFactory;
+import com.google.gson.reflect.TypeToken;
+import com.google.gson.stream.JsonReader;
+import com.google.gson.stream.JsonToken;
+import com.google.gson.stream.JsonWriter;
+import java.io.IOException;
+import java.io.Serializable;
+
+/**
+ * This adapter is required for fields of {@link java.io.Serializable} type to be treated as {@link
+ * Object}
+ */
+public class SerializableInterfaceAdapterFactory implements TypeAdapterFactory {
+
+  @Override
+  public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> type) {
+    if (Serializable.class.equals(type.getRawType())) {
+      return (TypeAdapter<T>) new SerializableAdapter(gson.getAdapter(Object.class));
+    }
+    return null;
+  }
+
+  private static class SerializableAdapter extends TypeAdapter<Object> {
+
+    TypeAdapter objectAdapter;
+
+    public SerializableAdapter(TypeAdapter objectAdapter) {
+      this.objectAdapter = objectAdapter;
+    }
+
+    @Override
+    public void write(JsonWriter out, Object value) throws IOException {
+      objectAdapter.write(out, value);
+    }
+
+    @Override
+    public Object read(JsonReader in) throws IOException {
+      JsonToken token = in.peek();
+      if (token.equals(JsonToken.NUMBER)) {
+        try {
+          return in.nextLong();
+        } catch (NumberFormatException e) {
+          return in.nextDouble();
+        }
+      }
+      return objectAdapter.read(in);
+    }
+  }
+}

core/che-core-api-dto/src/test/java/org/eclipse/che/dto/ServerDtoTest.java

@@ -31,6 +31,7 @@ import org.eclipse.che.dto.definitions.DTOHierarchy.GrandchildDto;
 import org.eclipse.che.dto.definitions.DtoWithAny;
 import org.eclipse.che.dto.definitions.DtoWithDelegate;
 import org.eclipse.che.dto.definitions.DtoWithFieldNames;
+import org.eclipse.che.dto.definitions.DtoWithSerializable;
 import org.eclipse.che.dto.definitions.SimpleDto;
 import org.eclipse.che.dto.definitions.model.Model;
 import org.eclipse.che.dto.definitions.model.ModelComponentDto;
@@ -435,4 +436,36 @@ public class ServerDtoTest {
   public void shouldThrowExceptionWhenInterfaceIsNotAnnotatedAsDto() {
     DtoFactory.newDto(DTOHierarchy.GrandchildWithoutDto.class);
   }
+
+  @Test
+  public void checkDtoDeserializationWithSerializableFields() {
+    final int fooId = 1;
+    final String fooString = "some string";
+    final long fooLong = 1234514362645634611L;
+    final double fooDouble = 1.2345;
+    final double fooRoundingDouble = 6.00;
+
+    JsonObject jsonMap = new JsonObject();
+    jsonMap.add("fooLong", new JsonPrimitive(fooLong));
+    jsonMap.add("fooBoolean", new JsonPrimitive(true));
+    jsonMap.add("fooDouble", new JsonPrimitive(fooDouble));
+    jsonMap.add("fooRoundingDouble", new JsonPrimitive(fooRoundingDouble));
+    jsonMap.add("fooString", new JsonPrimitive(fooString));
+
+    JsonObject json = new JsonObject();
+    json.add("id", new JsonPrimitive(fooId));
+    json.add("object", new JsonPrimitive(fooString));
+    json.add("objectMap", jsonMap);
+
+    DtoWithSerializable dto =
+        dtoFactory.createDtoFromJson(json.toString(), DtoWithSerializable.class);
+
+    assertEquals(dto.getId(), fooId);
+    assertEquals(dto.getObject(), fooString);
+    assertEquals(dto.getObjectMap().get("fooLong"), fooLong);
+    assertEquals(dto.getObjectMap().get("fooBoolean"), true);
+    assertEquals(dto.getObjectMap().get("fooDouble"), fooDouble);
+    assertEquals(dto.getObjectMap().get("fooString"), fooString);
+    assertEquals(dto.getObjectMap().get("fooRoundingDouble"), Math.round(fooRoundingDouble));
+  }
 }

core/che-core-api-dto/src/test/java/org/eclipse/che/dto/definitions/DtoWithSerializable.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2012-2018 Red Hat, Inc.
+ * This program and the accompanying materials are made
+ * available under the terms of the Eclipse Public License 2.0
+ * which is available at https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *   Red Hat, Inc. - initial API and implementation
+ */
+package org.eclipse.che.dto.definitions;
+
+import java.io.Serializable;
+import java.util.Map;
+import org.eclipse.che.dto.shared.DTO;
+
+/** DTO for testing serialization of fields with {@link java.io.Serializable} type */
+@DTO
+public interface DtoWithSerializable {
+  int getId();
+
+  DtoWithSerializable withId(int id);
+
+  Serializable getObject();
+
+  void setObject(Serializable object);
+
+  DtoWithSerializable withObject(Serializable object);
+
+  Map<String, Serializable> getObjectMap();
+
+  void setObjectMap(Map<String, Serializable> map);
+
+  DtoWithSerializable withObjectMap(Map<String, Serializable> map);
+}