This method uses Object.getClass() to get the type for the specified object, but the getClass() loses the generic type information because of the Type Erasure feature of Java. Note that this method works fine if the any of the fields of the specified object are generics, just the object itself should not be a generic type. But it can't do everything and sometimes it needs some help to correctly serialize and deserialize. share|improve this answer edited Oct 29 '13 at 6:24 Amar 10.9k43553 answered Oct 29 '13 at 6:02 Manish Khandelwal 13113 How to register this adapter on gson builder? –masterdany88 http://sonoportal.net/cannot-register/cannot-register-window-class.html
Sign In·ViewThread·Permalink Re: Usefull Only when we have a defined POJO Pragmateek10-Sep-13 12:03 Pragmateek10-Sep-13 12:03 Wow I've missed your comment, sorry for that! :/ Concerning your issue I guess you've String otherJson = gson.toJson(otherFile); // we finally try to read it and ensure all is fine. My AccountSearchMapsYouTubePlayNewsGmailDriveCalendarGoogle+TranslatePhotosMoreShoppingWalletFinanceDocsBooksBloggerContactsHangoutsEven more from GoogleSign inHidden fieldsSearch for groups or messages 12,577,950 members (60,075 online) Sign in Email Password Forgot your password? toJson publicStringtoJson(Objectsrc, TypetypeOfSrc) This method serializes the specified object, including those of generic types, into its equivalent Json representation.
This is done using the "setDateFormat" method of the GsonBuilder class, here is an example: Calendar calendar = Calendar.getInstance(); calendar.set(2013, 05, 8, 18, 05, 23); Date time = calendar.getTime(); GsonBuilder builder do u want to say that I must beware of the wrong values assigned, through the code? This features is typically used when you want to register a type adapter that does a little bit of work but then delegates further processing to the Gson default type adapter. Since: 1.4 toJsonTree publicJsonElementtoJsonTree(Objectsrc, TypetypeOfSrc) This method serializes the specified object, including those of generic types, into its equivalent representation as a tree of JsonElements.
Therefore, this method should not be used if the desired type is a generic type. The adapter factory for user defined types, let's dig into it:/**Copyright(C)2011GoogleInc.**LicensedundertheApacheLicense,Version2.0(the"License");*youmaynotusethisfileexceptincompliancewiththeLicense.*YoumayobtainacopyoftheLicenseat**http://www.apache.org/licenses/LICENSE-2.0**Unlessrequiredbyapplicablelaworagreedtoinwriting,software*distributedundertheLicenseisdistributedonan"ASIS"BASIS,*WITHOUTWARRANTIESORCONDITIONSOFANYKIND,eitherexpressorimplied.*SeetheLicenseforthespecificlanguagegoverningpermissionsand*limitationsundertheLicense.*/packagecom.google.gson.internal.bind;importcom.google.gson.FieldNamingStrategy;importcom.google.gson.Gson;importcom.google.gson.JsonSyntaxException;importcom.google.gson.TypeAdapter;importcom.google.gson.TypeAdapterFactory;importcom.google.gson.annotations.SerializedName;importcom.google.gson.extend.Convertor;importcom.google.gson.extend.annotations.Convert;importcom.google.gson.internal.$Gson$Types;importcom.google.gson.internal.ConstructorConstructor;importcom.google.gson.internal.Excluder;importcom.google.gson.internal.ObjectConstructor;importcom.google.gson.internal.Primitives;importcom.google.gson.reflect.TypeToken;importcom.google.gson.stream.JsonReader;importcom.google.gson.stream.JsonToken;importcom.google.gson.stream.JsonWriter;importjava.io.IOException;importjava.lang.reflect.Field;importjava.lang.reflect.Type;importjava.util.LinkedHashMap;importjava.util.Map;/***Typeadapterthatreflectsoverthefieldsandmethodsofaclass.*/publicfinalclassReflectiveTypeAdapterFactoryimplementsTypeAdapterFactory{privatefinalConstructorConstructorconstructorConstructor;privatefinalFieldNamingStrategyfieldNamingPolicy;privatefinalExcluderexcluder;publicReflectiveTypeAdapterFactory(ConstructorConstructorconstructorConstructor,FieldNamingStrategyfieldNamingPolicy,Excluderexcluder){this.constructorConstructor=constructorConstructor;this.fieldNamingPolicy=fieldNamingPolicy;this.excluder=excluder;}publicbooleanexcludeField(Fieldf,booleanserialize){return!excluder.excludeClass(f.getType(),serialize)&&!excluder.excludeField(f,serialize);}privateStringgetFieldName(Fieldf){SerializedNameserializedName=f.getAnnotation(SerializedName.class);returnserializedName==null?fieldNamingPolicy.translateName(f):serializedName.value();}public
Note that this method works fine if the any of the fields of the specified object are generics, just the object itself should not be a generic type. For example, NonNegativeInteger should be controlled to be positive in your ATL code. Returns null if json is null. http://www.blogjava.net/fredcn/archive/2013/11/22/406605.html Parameters: skipPast - The type adapter factory that needs to be skipped while searching for a matching type adapter.
void toJson(Objectsrc, TypetypeOfSrc, Appendablewriter) This method serializes the specified object, including I want to assign a value to my output model, but as it seems to be of the type "Java.math.BigInteger", I always get error messages like this one: "Caused by: java.lang.ClassCastException: To change the metamodel, I already said an "automatically generated metamodel" so I m unable to change it and even if I am able to do so, who will be doing The source code, along with a set of JUnit tests, are available in this archive: A simple Java-JSON mapping The model Here is a simplified representation of a file system: +--------------------+
Cheers –CaptRisky Sep 29 at 6:15 add a comment| up vote 12 down vote accepted At first, I tried to write a general custom type adaptor for Integer values, to catch https://google.github.io/gson/apidocs/com/google/gson/Gson.html Well, not always But what if the target property can have more than one possible type, i.e. true : null; } } Here is a program that simulates the interactions between the client and the third-party: GsonBuilder builder = new GsonBuilder(); builder.registerTypeAdapter(Boolean.class, new BooleanTypeAdapter()); Gson gson = builder.create(); Using it we will reproduce this simple file system: + / | +----+ /tmp | +----+ test.txt So we start by naively using directly a Gson parser: Folder2 folder = new
Two things u state in ur mail. >> To change the metamodel, I already said an "automatically generated >> metamodel" so I m unable to change it and even if I navigate here I just > long some way, maybe to convert my value '5' to bigInteger and then pass > it. Does ATL support BigIntegers now? Mapping from the third-party API If you intend to map these values to your Java object representation that uses a “true” boolean value you’ll have to help Gson a little.As an
When does “haben” push “nicht” to the end of the sentence? As always this is done by intercepting the normal serialization process but this time this is not trivial. Dishwasher Hose Clamps won't open Is it anti-pattern if a class property creates and returns a new instance of a class? Check This Out For the cases when the object is of generic type, invoke fromJson(String, Type).
public class Folder2 extends FileSystemItem { private FileSystemItem[] items; public FileSystemItem[] getItems() { return items; } public Folder2(String name, FileSystemItem...items) { super(name, null, null); this.items = items; } } If you Here is a simplification of the situation: enum Status { OK, KO } public class Response { private Status status; public Status getStatus() { return status; } public Response(Status status) { JSP GSON Encoding Problem Generate and add keyword variations using AdWords API Google Map with JSON Window Tabs (WndTabs) Add-In for DevStudio SAPrefs - Netscape-like Preferences Dialog AngleSharp Comments and Discussions
You signed out in another tab or window. Here is how to use it: Folder2 folder = new Folder2("/", new Folder2("tmp"), new File("test.txt")); RuntimeTypeAdapterFactory
You have to rely on the type of the property corresponding to the object, e.g. Sign In·ViewThread·Permalink Re: My vote of 5 Pragmateek11-Sep-13 2:54 Pragmateek11-Sep-13 2:54 Hi Prasad, thanks for your comment. Is there any other method to give values to such datatypes or ATL doesn't support them all. this contact form In this article I'll illustrate how to use Gson: I'll start with a (not so) simple use case that just works, then show how you can handle less standard situations, like
See here and here. –Milad Naseri Jan 14 '12 at 21:58 Of course, a more fix-and-go solution would be to look for invalid input in the JSON string using For non-generic objects, use toJson(Object) instead. Method Detail getAdapter public
Linux questions C# questions ASP.NET questions fabric questions SQL questions discussionsforums All Message Boards... If you have any issue with the code, you've spotted a typo, or some questions don't hesitate to ask in the comments. And there is good reasons why JSON has become so prevalent in the web world: first JSON is really well integrated with Javascript, the Esperanto of the web (and that's not The default field naming policy for the output Json is same as in Java.
Here is a basic Mail class that uses this annotation: import com.google.gson.annotations.SerializedName; public class Mail { @SerializedName("time") private int timestamp; public int getTimestamp() { return timestamp; } public Mail(int timestamp) { In most cases, you should just pass this (the type adapter factory from where getDelegateAdapter(com.google.gson.TypeAdapterFactory, com.google.gson.reflect.TypeToken
But my code error > clearly says: > > SEVERE: message: cannot set feature myML!BDefType.maxMasters to value 5 > SEVERE: exception: SEVERE: The value of type 'class > java.lang.Integer' must be You can change this behavior through GsonBuilder.excludeFieldsWithModifiers(int...). Well, not always But what if the target property can have more than one possible type, i.e. public class Folder2 extends FileSystemItem { private FileSystemItem[] items; public FileSystemItem[] getItems() { return items; } public Folder2(String name, FileSystemItem...items) { super(name, null, null); this.items = items; } } If you
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