| /* |
| * 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 elemental.json.impl; |
| |
| import java.io.ObjectStreamException; |
| |
| import elemental.json.JsonNull; |
| import elemental.json.JsonType; |
| import elemental.json.JsonValue; |
| |
| /** |
| * Server-side implementation of JsonObject. |
| */ |
| public class JreJsonNull extends JreJsonValue implements JsonNull { |
| |
| private static final long serialVersionUID = 1L; |
| |
| public static final JsonNull NULL_INSTANCE = new JreJsonNull(); |
| |
| @Override |
| public double asNumber() { |
| return 0; |
| } |
| |
| @Override |
| public boolean asBoolean() { |
| return false; |
| } |
| |
| @Override |
| public String asString() { |
| return "null"; |
| } |
| |
| public Object getObject() { |
| return null; |
| } |
| |
| public JsonType getType() { |
| return JsonType.NULL; |
| } |
| |
| @Override |
| public boolean jsEquals(JsonValue value) { |
| return value == null || value.getType() == JsonType.NULL; |
| } |
| |
| @Override |
| public void traverse(JsonVisitor visitor, elemental.json.impl.JsonContext ctx) { |
| visitor.visitNull(ctx); |
| } |
| |
| public String toJson() { |
| return null; |
| } |
| |
| @com.google.gwt.core.shared.GwtIncompatible |
| private Object readResolve() throws ObjectStreamException { |
| return NULL_INSTANCE; |
| } |
| } |