Example usage for com.google.gson TypeAdapter fromJsonTree

Introduction

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

Prototype

public final T fromJsonTree(JsonElement jsonTree) 

Source Link

Document

Converts jsonTree to a Java object.

Usage

From source file:de.lulebe.designer.external.RuntimeTypeAdapterFactory.java

License:Apache License

public <R> TypeAdapter<R> create(Gson gson, TypeToken<R> type) {
    if (type == null || !baseType.isAssignableFrom(type.getRawType())) {
        return null;
    }/*from w  w  w .  j  ava  2 s.com*/

    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().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();
}

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From source file:de.symeda.sormas.app.rest.RuntimeTypeAdapterFactory.java

License:Open Source License

public <R> TypeAdapter<R> create(Gson gson, TypeToken<R> type) {
    if (type.getRawType() != baseType) {
        return null;
    }//  w  w  w  . ja  v  a  2  s.  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;
            if (maintainType) {
                labelJsonElement = jsonElement.getAsJsonObject().get(typeFieldName);
            } else {
                labelJsonElement = jsonElement.getAsJsonObject().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 (maintainType) {
                Streams.write(jsonObject, out);
                return;
            }

            JsonObject clone = new JsonObject();

            if (jsonObject.has(typeFieldName)) {
                throw new JsonParseException("cannot serialize " + srcType.getName()
                        + " because it already defines a field named " + typeFieldName);
            }
            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:io.hops.hopsworks.api.zeppelin.json.NotebookTypeAdapterFactory.java

License:Apache License

private TypeAdapter<C> customizeTypeAdapter(Gson gson, TypeToken<C> type) {
    final TypeAdapter<C> delegate = gson.getDelegateAdapter(this, type);
    final TypeAdapter<JsonElement> elementAdapter = gson.getAdapter(JsonElement.class);
    return new TypeAdapter<C>() {
        @Override/*from   w w w. j  a  v  a 2  s. co  m*/
        public void write(JsonWriter out, C value) throws IOException {
            JsonElement tree = delegate.toJsonTree(value);
            beforeWrite(value, tree);
            elementAdapter.write(out, tree);
        }

        @Override
        public C read(JsonReader in) throws IOException {
            JsonElement tree = elementAdapter.read(in);
            afterRead(tree);
            return delegate.fromJsonTree(tree);
        }
    };
}

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From source file:jp.pay.model.ExternalAccountTypeAdapterFactory.java

License:Open Source License

@SuppressWarnings("unchecked")
public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> type) {
    if (!ExternalAccount.class.isAssignableFrom(type.getRawType())) {
        return null; // this class only serializes 'ExternalAccount' and its subtypes
    }/*from  w  w  w  . ja  va2  s. c o  m*/

    final String SOURCE_OBJECT_PROP = "object";

    final TypeAdapter<JsonElement> elementAdapter = gson.getAdapter(JsonElement.class);
    final TypeAdapter<ExternalAccount> externalAccountAdapter = gson.getDelegateAdapter(this,
            TypeToken.get(ExternalAccount.class));

    final TypeAdapter<Card> cardAdapter = gson.getDelegateAdapter(this, TypeToken.get(Card.class));

    TypeAdapter<ExternalAccount> result = new TypeAdapter<ExternalAccount>() {
        public void write(JsonWriter out, ExternalAccount value) throws IOException {
            // TODO: check instance of for correct writer
            externalAccountAdapter.write(out, value);
        }

        public ExternalAccount read(JsonReader in) throws IOException {
            JsonObject object = elementAdapter.read(in).getAsJsonObject();
            String sourceObject = object.getAsJsonPrimitive(SOURCE_OBJECT_PROP).getAsString();

            if (sourceObject.equals("card")) {
                return cardAdapter.fromJsonTree(object);
            } else {
                return externalAccountAdapter.fromJsonTree(object);
            }
        }
    }.nullSafe();

    return (TypeAdapter<T>) result;
}

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From source file:leafcutter.client.Serializer.java

License:Apache License

public <R> TypeAdapter<R> create(Gson gson, TypeToken<R> type) {
    if (type.getRawType() != baseType) {
        return null;
    }//  ww  w .java 2  s.c om

    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().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();
}

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From source file:me.albinmathew.celluloid.api.http.ItemTypeAdapterFactory.java

License:Apache License

@NonNull
public <T> TypeAdapter<T> create(@NonNull Gson gson, final TypeToken<T> type) {

    final TypeAdapter<T> delegate = gson.getDelegateAdapter(this, type);
    final TypeAdapter<JsonElement> elementAdapter = gson.getAdapter(JsonElement.class);

    return new TypeAdapter<T>() {

        public void write(JsonWriter out, T value) throws IOException {
            delegate.write(out, value);//from  w w  w.j  av a 2  s  .c o m
        }

        public T read(JsonReader in) throws IOException {

            JsonElement jsonElement = elementAdapter.read(in);
            return delegate.fromJsonTree(jsonElement);
        }
    }.nullSafe();
}

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From source file:mobi.tattu.utils.persistance.datastore.gson.RuntimeTypeAdapterFactory.java

License:Apache License

public <R> TypeAdapter<R> create(Gson gson, TypeToken<R> type) {
    if (!baseType.isAssignableFrom(type.getRawType())) {
        return null;
    }/*from w ww .  ja  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().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 configure a subtype?");
            }
            try {
                return delegate.fromJsonTree(jsonElement);
            } catch (JsonSyntaxException e) {
                return null;
            }
        }

        @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 configure 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();
}

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From source file:mx.openpay.client.serialization.OpenpayTypeAdapterFactory.java

License:Apache License

public TypeAdapter<C> getClassAdapter(final Gson gson, final TypeToken<C> type) {
    final TypeAdapter<C> delegate = gson.getDelegateAdapter(this, type);
    final TypeAdapter<JsonElement> elementAdapter = gson.getAdapter(JsonElement.class);
    return new TypeAdapter<C>() {

        @Override/* www .j av  a  2  s  .  c o m*/
        public void write(final JsonWriter out, final C value) throws IOException {
            JsonElement tree = delegate.toJsonTree(value);
            OpenpayTypeAdapterFactory.this.beforeWrite(value, tree);
            elementAdapter.write(out, tree);
        }

        @Override
        public C read(final JsonReader in) throws IOException {
            JsonElement tree = elementAdapter.read(in);
            OpenpayTypeAdapterFactory.this.afterRead(tree);
            return delegate.fromJsonTree(tree);
        }
    };
}

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From source file:net.billforward.gson.typeadapters.RuntimeTypeAdapterFactory.java

License:Apache License

public <R> TypeAdapter<R> create(Gson gson, TypeToken<R> type) {
    if (type.getRawType() != baseType) {
        return null;
    }// w ww  . j av  a  2 s  . c o 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().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) {
                delegate = (TypeAdapter<R>) labelToDelegate.get("default_value_mapping");
            }
            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);
        }
    };
}

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From source file:net.segoia.event.eventbus.config.json.EventBusJsonConfigLoader.java

License:Apache License

public static EventBusJsonConfig load(Reader reader) {
    GsonBuilder gb = new GsonBuilder();

    gb.registerTypeAdapter(Condition.class, new JsonDeserializer<Condition>() {

        @Override/*from   w ww .j a va 2s  .  c  o m*/
        public Condition deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
                throws JsonParseException {
            JsonObject jo = json.getAsJsonObject();
            JsonElement conditionType = jo.get("ctype");
            String ctype = null;
            if (conditionType != null) {
                ctype = conditionType.getAsString().trim();
                if ("".equals(ctype)) {
                    ctype = null;
                }
            }
            JsonDeserializer<?> deserializerForType = jsonDeserializers.get(ctype);
            if (deserializerForType == null) {
                throw new JsonParseException("No deserializer defined for condition type " + ctype);
            }
            return (Condition) deserializerForType.deserialize(json, typeOfT, context);
        }
    });

    gb.registerTypeAdapterFactory(new TypeAdapterFactory() {

        @Override
        public <T> TypeAdapter<T> create(final Gson gson, final TypeToken<T> type) {
            final TypeAdapter<T> delegateAdapter = gson.getDelegateAdapter(this, type);

            TypeAdapter<T> typeAdapter = new TypeAdapter<T>() {

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

                @Override
                public T read(JsonReader in) throws IOException {
                    JsonElement value = Streams.parse(in);

                    if (value.isJsonNull()) {
                        return null;
                    }

                    if (!value.isJsonObject()) {
                        return delegateAdapter.fromJsonTree(value);
                    }
                    // System.out.println(value+" "+value.getClass());
                    JsonObject jo = value.getAsJsonObject();

                    JsonElement cnameElem = jo.remove("className");

                    if (cnameElem != null) {
                        String cname = cnameElem.getAsString();

                        try {
                            // System.out.println("using clazz " + cname);
                            return (T) gson.fromJson(value, Class.forName(cname));
                        } catch (ClassNotFoundException e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                            return null;
                        }
                    } else {
                        return delegateAdapter.fromJsonTree(value);
                    }
                }
            };

            return typeAdapter;

        }
    });

    final Gson gson = gb.create();

    EventBusJsonConfig ebusConfig = gson.fromJson(reader, EventBusJsonConfig.class);

    return ebusConfig;
}

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