| // Copyright (C) 2015 The Android Open Source Project |
| // |
| // 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.googlesource.gerrit.plugins.manager.gson; |
| |
| import com.google.gson.JsonElement; |
| import java.util.Optional; |
| import java.util.function.Function; |
| |
| public class SmartJson { |
| |
| private final JsonElement jsonElem; |
| |
| private SmartJson(JsonElement elem) { |
| this.jsonElem = elem; |
| } |
| |
| public static SmartJson of(JsonElement fromJson) { |
| return new SmartJson(fromJson); |
| } |
| |
| public Optional<String> getOptionalString(String fieldName) { |
| return getOptional(fieldName) |
| .map( |
| new Function<SmartJson, String>() { |
| @Override |
| public String apply(SmartJson elem) { |
| if (!elem.jsonElem.isJsonPrimitive()) { |
| throw new IllegalArgumentException( |
| "cannot convert " + elem.jsonElem + " into a String"); |
| } |
| return elem.jsonElem.getAsString(); |
| } |
| }); |
| } |
| |
| public String getString(String fieldName) { |
| return getOptionalString(fieldName).orElse(""); |
| } |
| |
| public Optional<SmartJson> getOptional(String fieldName) { |
| if (jsonElem != null |
| && !jsonElem.isJsonNull() |
| && jsonElem.getAsJsonObject().get(fieldName) != null) { |
| return Optional.of(SmartJson.of(jsonElem.getAsJsonObject().get(fieldName))); |
| } |
| return Optional.empty(); |
| } |
| |
| public SmartJson get(String fieldName) { |
| return getOptional(fieldName).get(); |
| } |
| |
| public JsonElement get() { |
| return jsonElem; |
| } |
| } |