| /* |
| * Copyright 2010 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.gwt.dev.json; |
| |
| import java.io.IOException; |
| import java.io.Writer; |
| |
| /** |
| * All specific JSON types in this package implement this interface. |
| */ |
| public interface JsonValue { |
| /** |
| * JSON placeholder for null. |
| */ |
| JsonValue NULL = new JsonValue() { |
| |
| @Override |
| public JsonArray asArray() { |
| return null; |
| } |
| |
| @Override |
| public JsonBoolean asBoolean() { |
| return null; |
| } |
| |
| @Override |
| public JsonNumber asNumber() { |
| return null; |
| } |
| |
| @Override |
| public JsonObject asObject() { |
| return null; |
| } |
| |
| @Override |
| public JsonString asString() { |
| return null; |
| } |
| |
| @Override |
| public JsonValue copyDeeply() { |
| return this; |
| } |
| |
| @Override |
| public boolean isArray() { |
| return false; |
| } |
| |
| @Override |
| public boolean isBoolean() { |
| return false; |
| } |
| |
| @Override |
| public boolean isNumber() { |
| return false; |
| } |
| |
| @Override |
| public boolean isObject() { |
| return false; |
| } |
| |
| @Override |
| public boolean isString() { |
| return false; |
| } |
| |
| @Override |
| public void write(Writer writer) throws IOException { |
| writer.append("null"); |
| } |
| }; |
| |
| JsonArray asArray(); |
| |
| JsonBoolean asBoolean(); |
| |
| JsonNumber asNumber(); |
| |
| JsonObject asObject(); |
| |
| JsonString asString(); |
| |
| /** |
| * Makes a full copy of the JSON data structure. |
| */ |
| JsonValue copyDeeply(); |
| |
| boolean isArray(); |
| |
| boolean isBoolean(); |
| |
| boolean isNumber(); |
| |
| boolean isObject(); |
| |
| boolean isString(); |
| |
| void write(Writer writer) throws IOException; |
| } |