com.google.firebase.database.util.JsonMapper Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of firebase-admin Show documentation

This is the official Firebase Admin Java SDK. Build extraordinary native JVM apps in minutes with Firebase. The Firebase platform can power your app’s backend, user authentication, static hosting, and more.

There is a newer version: 9.4.1

Show newest version

/*
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.firebase.database.util;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonSyntaxException;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonToken;
import java.io.IOException;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * Helper class to convert from/to JSON strings. TODO: This class should ideally not live in
 * firebase-database-connection, but it's required by both firebase-database and
 * firebase-database-connection, so leave it here for now.
 */
public class JsonMapper {

  private static final Gson GSON = new GsonBuilder().serializeNulls().create();

  public static String serializeJson(Object object) throws IOException {
    try {
      return GSON.toJson(object);
    } catch (JsonSyntaxException e) {
      throw new IOException(e);
    }
  }

  public static Map parseJson(String json) throws IOException {
    try {
      JsonReader jsonReader = new JsonReader(new StringReader(json));
      return unwrapJsonObject(jsonReader);
    } catch (IllegalStateException | JsonSyntaxException e) {
      throw new IOException(e);
    }
  }

  public static Object parseJsonValue(String json) throws IOException {
    try {
      JsonReader jsonReader = new JsonReader(new StringReader(json));
      jsonReader.setLenient(true);
      return unwrapJson(jsonReader);
    } catch (IllegalStateException | JsonSyntaxException e) {
      throw new IOException(e);
    }
  }

  private static Map unwrapJsonObject(JsonReader jsonReader) throws IOException {
    Map map = new HashMap<>();
    jsonReader.beginObject();
    while (jsonReader.peek() != JsonToken.END_OBJECT) {
      String key = jsonReader.nextName();
      map.put(key, unwrapJson(jsonReader));
    }
    jsonReader.endObject();
    return map;
  }

  private static List