| /****************************************************************************** |
| * Copyright (c) 2018 TypeFox and others. |
| * |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Public License v. 2.0 which is available at |
| * http://www.eclipse.org/legal/epl-2.0, |
| * or the Eclipse Distribution License v. 1.0 which is available at |
| * http://www.eclipse.org/org/documents/edl-v10.php. |
| * |
| * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause |
| ******************************************************************************/ |
| package org.eclipse.lsp4j.jsonrpc.json.adapters; |
| |
| import java.io.IOException; |
| |
| import com.google.gson.Gson; |
| import com.google.gson.JsonElement; |
| 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.JsonWriter; |
| |
| /** |
| * A type adapter that reads every input into a tree of {@link JsonElement}s. |
| */ |
| public class JsonElementTypeAdapter extends TypeAdapter<Object> { |
| |
| /** |
| * This factory should not be registered with a GsonBuilder because it always matches. |
| * Use it as argument to a {@link com.google.gson.annotations.JsonAdapter} annotation like this: |
| * {@code @JsonAdapter(JsonElementTypeAdapter.Factory.class)} |
| */ |
| public static class Factory implements TypeAdapterFactory { |
| |
| @SuppressWarnings("unchecked") |
| @Override |
| public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> type) { |
| return (TypeAdapter<T>) new JsonElementTypeAdapter(gson); |
| } |
| |
| } |
| |
| private final Gson gson; |
| private final TypeAdapter<JsonElement> adapter; |
| |
| public JsonElementTypeAdapter(Gson gson) { |
| this.gson = gson; |
| this.adapter = gson.getAdapter(JsonElement.class); |
| } |
| |
| @Override |
| public JsonElement read(JsonReader in) throws IOException { |
| return adapter.read(in); |
| } |
| |
| @Override |
| public void write(JsonWriter out, Object value) throws IOException { |
| if (value == null) { |
| out.nullValue(); |
| } else if (value instanceof JsonElement) { |
| adapter.write(out, (JsonElement) value); |
| } else { |
| gson.toJson(value, value.getClass(), out);; |
| } |
| } |
| |
| } |