Example usage for com.google.gson TypeAdapter TypeAdapter

Introduction

In this page you can find the example usage for com.google.gson TypeAdapter TypeAdapter.

Prototype

TypeAdapter

Source Link

Usage

From source file:com.github.sheigutn.pushbullet.gson.RuntimeTypeAdapterFactory.java

License:Apache License

public <R> TypeAdapter<R> create(Gson gson, TypeToken<R> type) {
    if (type.getRawType() != baseType) {
        return null;
    }//from  w  w w. j  a v  a2  s.c  o  m

    if (baseDelegateAdapter == null) {
        baseDelegateAdapter = gson.getDelegateAdapter(RuntimeTypeAdapterFactory.this, TypeToken.get(baseType));
    }

    final Map<String, TypeAdapter<?>> labelToDelegate = new LinkedHashMap<String, TypeAdapter<?>>();
    final Map<Class<?>, TypeAdapter<?>> subtypeToDelegate = new LinkedHashMap<Class<?>, TypeAdapter<?>>();
    for (Map.Entry<String, Class<?>> entry : labelToSubtype.entrySet()) {
        TypeAdapter<?> delegate = gson.getDelegateAdapter(this, TypeToken.get(entry.getValue()));
        labelToDelegate.put(entry.getKey(), delegate);
        subtypeToDelegate.put(entry.getValue(), delegate);
    }

    return new TypeAdapter<R>() {
        @SuppressWarnings("unchecked")
        @Override
        public R read(JsonReader in) throws IOException {
            JsonElement jsonElement = Streams.parse(in);
            JsonElement labelJsonElement = jsonElement.getAsJsonObject().get(typeFieldName); //remove(typeFieldName) changed to get(typeFieldName)
            if (labelJsonElement == null) {
                return (R) baseDelegateAdapter.fromJsonTree(jsonElement);
            }
            String label = labelJsonElement.getAsString();
            @SuppressWarnings("unchecked") // registration requires that subtype extends T
            TypeAdapter<R> delegate = (TypeAdapter<R>) labelToDelegate.get(label);
            if (delegate == null) {
                throw new JsonParseException("cannot deserialize " + baseType + " subtype named " + label
                        + "; did you forget to register a subtype?");
            }
            return delegate.fromJsonTree(jsonElement);
        }

        @Override
        public void write(JsonWriter out, R value) throws IOException {
            Class<?> srcType = value.getClass();
            String label = subtypeToLabel.get(srcType);
            @SuppressWarnings("unchecked") // registration requires that subtype extends T
            TypeAdapter<R> delegate = (TypeAdapter<R>) subtypeToDelegate.get(srcType);
            if (delegate == null) {
                throw new JsonParseException(
                        "cannot serialize " + srcType.getName() + "; did you forget to register a subtype?");
            }
            JsonObject jsonObject = delegate.toJsonTree(value).getAsJsonObject();
            //if (jsonObject.has(typeFieldName)) {
            //    throw new JsonParseException("cannot serialize " + srcType.getName()
            //            + " because it already defines a field named " + typeFieldName); <-- Commented
            //}
            JsonObject clone = new JsonObject();
            clone.add(typeFieldName, new JsonPrimitive(label));
            for (Map.Entry<String, JsonElement> e : jsonObject.entrySet()) {
                clone.add(e.getKey(), e.getValue());
            }
            Streams.write(clone, out);
        }
    }.nullSafe();
}

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From source file:com.google.caliper.json.ImmutableListTypeAdatperFactory.java

License:Apache License

@SuppressWarnings("unchecked")
@Override/*from  w w w.  ja v  a 2  s.c  o  m*/
public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> typeToken) {
    Type type = typeToken.getType();
    if (typeToken.getRawType() != ImmutableList.class || !(type instanceof ParameterizedType)) {
        return null;
    }

    com.google.common.reflect.TypeToken<ImmutableList<?>> betterToken = (com.google.common.reflect.TypeToken<ImmutableList<?>>) com.google.common.reflect.TypeToken
            .of(typeToken.getType());
    final TypeAdapter<ArrayList<?>> arrayListAdapter = (TypeAdapter<ArrayList<?>>) gson.getAdapter(
            TypeToken.get(betterToken.getSupertype(List.class).getSubtype(ArrayList.class).getType()));
    return new TypeAdapter<T>() {
        @Override
        public void write(JsonWriter out, T value) throws IOException {
            ArrayList<?> arrayList = Lists.newArrayList((List<?>) value);
            arrayListAdapter.write(out, arrayList);
        }

        @Override
        public T read(JsonReader in) throws IOException {
            ArrayList<?> arrayList = arrayListAdapter.read(in);
            return (T) ImmutableList.copyOf(arrayList);
        }
    };
}

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From source file:com.google.caliper.json.ImmutableMapTypeAdapterFactory.java

License:Apache License

@SuppressWarnings("unchecked")
@Override//from   w ww  . j ava2 s  .com
public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> typeToken) {
    Type type = typeToken.getType();
    if (typeToken.getRawType() != ImmutableMap.class || !(type instanceof ParameterizedType)) {
        return null;
    }

    com.google.common.reflect.TypeToken<ImmutableMap<?, ?>> betterToken = (com.google.common.reflect.TypeToken<ImmutableMap<?, ?>>) com.google.common.reflect.TypeToken
            .of(typeToken.getType());
    final TypeAdapter<HashMap<?, ?>> hashMapAdapter = (TypeAdapter<HashMap<?, ?>>) gson
            .getAdapter(TypeToken.get(betterToken.getSupertype(Map.class).getSubtype(HashMap.class).getType()));
    return new TypeAdapter<T>() {
        @Override
        public void write(JsonWriter out, T value) throws IOException {
            HashMap<?, ?> hashMap = Maps.newHashMap((Map<?, ?>) value);
            hashMapAdapter.write(out, hashMap);
        }

        @Override
        public T read(JsonReader in) throws IOException {
            HashMap<?, ?> hashMap = hashMapAdapter.read(in);
            return (T) ImmutableMap.copyOf(hashMap);
        }
    };
}

---

From source file:com.google.caliper.json.ImmutableMultimapTypeAdapterFactory.java

License:Apache License

@Override
@SuppressWarnings({ "unchecked", "rawtypes" })
public <T> TypeAdapter<T> create(Gson gson, com.google.gson.reflect.TypeToken<T> typeToken) {
    if (ImmutableListMultimap.class.isAssignableFrom(typeToken.getRawType())) {
        TypeToken<Map<?, List<?>>> mapToken = getMapOfListsToken((TypeToken) TypeToken.of(typeToken.getType()));
        final TypeAdapter<Map<?, List<?>>> adapter = (TypeAdapter<Map<?, List<?>>>) gson
                .getAdapter(com.google.gson.reflect.TypeToken.get(mapToken.getType()));
        return new TypeAdapter<T>() {
            @Override/* w  ww . j  a va 2  s.c  o  m*/
            public void write(JsonWriter out, T value) throws IOException {
                ImmutableListMultimap<?, ?> multimap = (ImmutableListMultimap<?, ?>) value;
                adapter.write(out, (Map) multimap.asMap());
            }

            @Override
            public T read(JsonReader in) throws IOException {
                Map<?, List<?>> value = adapter.read(in);
                ImmutableListMultimap.Builder builder = ImmutableListMultimap.builder();
                for (Entry<?, List<?>> entry : value.entrySet()) {
                    builder.putAll(entry.getKey(), entry.getValue());
                }
                return (T) builder.build();
            }
        };
    } else if (ImmutableSetMultimap.class.isAssignableFrom(typeToken.getRawType())) {
        TypeToken<Map<?, Set<?>>> mapToken = getMapOfSetsToken((TypeToken) TypeToken.of(typeToken.getType()));
        final TypeAdapter<Map<?, Set<?>>> adapter = (TypeAdapter<Map<?, Set<?>>>) gson
                .getAdapter(com.google.gson.reflect.TypeToken.get(mapToken.getType()));
        return new TypeAdapter<T>() {
            @Override
            public void write(JsonWriter out, T value) throws IOException {
                ImmutableSetMultimap<?, ?> multimap = (ImmutableSetMultimap<?, ?>) value;
                adapter.write(out, (Map) multimap.asMap());
            }

            @Override
            public T read(JsonReader in) throws IOException {
                Map<?, Set<?>> value = adapter.read(in);
                ImmutableSetMultimap.Builder builder = ImmutableSetMultimap.builder();
                for (Entry<?, Set<?>> entry : value.entrySet()) {
                    builder.putAll(entry.getKey(), entry.getValue());
                }
                return (T) builder.build();
            }
        };
    } else {
        return null;
    }
}

---

From source file:com.google.caliper.json.NaturallySortedMapTypeAdapterFactory.java

License:Apache License

@SuppressWarnings("unchecked")
@Override/*from  w ww .j  a va  2  s . c  o  m*/
public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> typeToken) {
    Type type = typeToken.getType();
    if (!CLASSES.contains(typeToken.getRawType()) || !(type instanceof ParameterizedType)) {
        return null;
    }

    com.google.common.reflect.TypeToken<SortedMap<?, ?>> betterToken = (com.google.common.reflect.TypeToken<SortedMap<?, ?>>) com.google.common.reflect.TypeToken
            .of(typeToken.getType());
    final TypeAdapter<Map<?, ?>> mapAdapter = (TypeAdapter<Map<?, ?>>) gson
            .getAdapter(TypeToken.get(betterToken.getSupertype(Map.class).getType()));
    return new TypeAdapter<T>() {
        @Override
        public void write(JsonWriter out, T value) throws IOException {
            TreeMap<?, ?> treeMap = Maps.newTreeMap((SortedMap<?, ?>) value);
            mapAdapter.write(out, treeMap);
        }

        @SuppressWarnings("rawtypes")
        @Override
        public T read(JsonReader in) throws IOException {
            TreeMap treeMap = Maps.newTreeMap();
            treeMap.putAll(mapAdapter.read(in));
            return (T) treeMap;
        }
    };
}

---

From source file:com.gsaul.AethonSimulator.RuntimeTypeAdapterFactory.java

License:Apache License

public <R> TypeAdapter<R> create(Gson gson, TypeToken<R> type) {
    if (type.getRawType() != baseType) {
        return null;
    }//from   ww w. j  a  v  a 2s  .co  m

    final Map<String, TypeAdapter<?>> labelToDelegate = new LinkedHashMap<String, TypeAdapter<?>>();
    final Map<Class<?>, TypeAdapter<?>> subtypeToDelegate = new LinkedHashMap<Class<?>, TypeAdapter<?>>();
    for (Map.Entry<String, Class<?>> entry : labelToSubtype.entrySet()) {
        TypeAdapter<?> delegate = gson.getDelegateAdapter(this, TypeToken.get(entry.getValue()));
        labelToDelegate.put(entry.getKey(), delegate);
        subtypeToDelegate.put(entry.getValue(), delegate);
    }

    return new TypeAdapter<R>() {
        @Override
        public R read(JsonReader in) throws IOException {
            JsonElement jsonElement = Streams.parse(in);
            JsonElement labelJsonElement = jsonElement.getAsJsonObject().get(typeFieldName); //used to be .remove(typeFieldName);
            if (labelJsonElement == null) {
                throw new JsonParseException("cannot deserialize " + baseType
                        + " because it does not define a field named " + typeFieldName);
            }
            String label = labelJsonElement.getAsString();
            @SuppressWarnings("unchecked") // registration requires that subtype extends T
            TypeAdapter<R> delegate = (TypeAdapter<R>) labelToDelegate.get(label);
            if (delegate == null) {
                throw new JsonParseException("cannot deserialize " + baseType + " subtype named " + label
                        + "; did you forget to register a subtype?");
            }
            return delegate.fromJsonTree(jsonElement);
        }

        @Override
        public void write(JsonWriter out, R value) throws IOException {
            Class<?> srcType = value.getClass();
            String label = subtypeToLabel.get(srcType);
            @SuppressWarnings("unchecked") // registration requires that subtype extends T
            TypeAdapter<R> delegate = (TypeAdapter<R>) subtypeToDelegate.get(srcType);
            if (delegate == null) {
                throw new JsonParseException(
                        "cannot serialize " + srcType.getName() + "; did you forget to register a subtype?");
            }
            JsonObject jsonObject = delegate.toJsonTree(value).getAsJsonObject();
            if (jsonObject.has(typeFieldName)) {
                throw new JsonParseException("cannot serialize " + srcType.getName()
                        + " because it already defines a field named " + typeFieldName);
            }
            JsonObject clone = new JsonObject();
            clone.add(typeFieldName, new JsonPrimitive(label));
            for (Map.Entry<String, JsonElement> e : jsonObject.entrySet()) {
                clone.add(e.getKey(), e.getValue());
            }
            Streams.write(clone, out);
        }
    }.nullSafe();
}

---

From source file:com.hkm.disqus.api.gson.BlacklistsEntryTypeAdapterFactory.java

License:Apache License

@Override
public <T> TypeAdapter<T> create(final Gson gson, TypeToken<T> type) {
    // Return null if not a blacklist entry object
    if (!type.getType().equals(Entry.class)) {
        return null;
    }/*from  ww  w.  ja va  2s  .  c  o m*/

    // Get delegate
    final TypeAdapter<T> delegate = gson.getDelegateAdapter(this, type);

    // Return adapter
    return new TypeAdapter<T>() {

        @Override
        public void write(JsonWriter out, T value) throws IOException {
            delegate.write(out, value);
        }

        @Override
        public T read(JsonReader in) throws IOException {
            JsonElement jsonTree = gson.fromJson(in, JsonElement.class);
            JsonElement value = jsonTree.getAsJsonObject().get("value");

            // Process the entry with the delegate
            T entry = delegate.fromJsonTree(jsonTree);

            // Process value if needed
            if (value.isJsonObject()) {
                ((Entry) entry).value = gson.fromJson(value, User.class);
            }

            // Return entry
            return entry;
        }

    };
}

---

From source file:com.hkm.disqus.api.gson.PostTypeAdapterFactory.java

License:Apache License

@Override
public <T> TypeAdapter<T> create(final Gson gson, TypeToken<T> type) {
    // Return null if not a post object
    if (!type.getType().equals(Post.class)) {
        return null;
    }/*from www  .  ja v a2  s.c  om*/

    // Get delegate
    final TypeAdapter<T> delegate = gson.getDelegateAdapter(this, type);

    // Return adapter
    return new TypeAdapter<T>() {

        @Override
        public void write(JsonWriter out, T value) throws IOException {
            delegate.write(out, value);
        }

        @Override
        public T read(JsonReader in) throws IOException {
            JsonElement jsonTree = gson.fromJson(in, JsonElement.class);
            JsonElement forum = jsonTree.getAsJsonObject().get("forum");
            JsonElement thread = jsonTree.getAsJsonObject().get("thread");

            // Process the post with the delegate
            T post = delegate.fromJsonTree(jsonTree);

            // Process forum and thread if needed
            if (forum.isJsonObject()) {
                ((Post) post).forum = gson.fromJson(forum, Forum.class);
            }
            if (thread.isJsonObject()) {
                ((Post) post).thread = gson.fromJson(thread, Thread.class);
            }

            // Return post
            return post;
        }

    };

}

---

From source file:com.hkm.disqus.api.gson.ThreadTypeAdapterFactory.java

License:Apache License

@Override
public <T> TypeAdapter<T> create(final Gson gson, TypeToken<T> type) {
    // Return null if not the thread type
    if (!type.getType().equals(Thread.class)) {
        return null;
    }//from   w  w w .ja  v  a2  s.  com

    // Get delegate
    final TypeAdapter<T> delegate = gson.getDelegateAdapter(this, type);

    // Return adapter
    return new TypeAdapter<T>() {

        @Override
        public void write(JsonWriter out, T value) throws IOException {
            delegate.write(out, value);
        }

        @Override
        public T read(JsonReader in) throws IOException {
            JsonElement jsonTree = gson.fromJson(in, JsonElement.class);
            JsonElement forum = jsonTree.getAsJsonObject().get("forum");
            JsonElement author = jsonTree.getAsJsonObject().get("author");
            JsonElement category = jsonTree.getAsJsonObject().get("category");

            // Process the thread with the delegate
            T thread = delegate.fromJsonTree(jsonTree);

            // Process forum and author if needed
            if (forum.isJsonObject()) {
                ((Thread) thread).forum = gson.fromJson(forum, Forum.class);
            }
            if (author.isJsonObject()) {
                ((Thread) thread).author = gson.fromJson(author, User.class);
            }
            if (category.isJsonObject()) {
                ((Thread) thread).category = gson.fromJson(category, Category.class);
            }

            // Return thread
            return thread;
        }

    };

}

---

From source file:com.ibm.og.client.ApacheClient.java

License:Open Source License

private Gson createGson() {
    return new GsonBuilder().setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES)
            .setLongSerializationPolicy(LongSerializationPolicy.STRING)
            .registerTypeAdapter(Double.class, new TypeAdapter<Double>() {
                @Override/*w ww  .j av a 2  s  .  c o m*/
                public void write(final JsonWriter out, final Double value) throws IOException {
                    // round decimals to 2 places
                    out.value(new BigDecimal(value).setScale(2, RoundingMode.HALF_UP).doubleValue());
                }

                @Override
                public Double read(final JsonReader in) throws IOException {
                    return in.nextDouble();
                }
            }.nullSafe()).create();
}

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