| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.twill.internal.json; |
| |
| import com.google.gson.JsonElement; |
| import com.google.gson.JsonObject; |
| |
| /** |
| * Collections of helper functions for json codec. |
| */ |
| public final class JsonUtils { |
| |
| private JsonUtils() { |
| } |
| |
| /** |
| * Returns a String representation of the given property. |
| */ |
| public static String getAsString(JsonObject json, String property) { |
| JsonElement jsonElement = json.get(property); |
| if (jsonElement == null || jsonElement.isJsonNull()) { |
| return null; |
| } |
| if (jsonElement.isJsonPrimitive()) { |
| return jsonElement.getAsString(); |
| } |
| return jsonElement.toString(); |
| } |
| |
| /** |
| * Returns a long representation of the given property. |
| */ |
| public static long getAsLong(JsonObject json, String property, long defaultValue) { |
| try { |
| return json.get(property).getAsLong(); |
| } catch (Exception e) { |
| return defaultValue; |
| } |
| } |
| |
| /** |
| * Returns a long representation of the given property. |
| */ |
| public static int getAsInt(JsonObject json, String property, int defaultValue) { |
| try { |
| return json.get(property).getAsInt(); |
| } catch (Exception e) { |
| return defaultValue; |
| } |
| } |
| } |