/*
 * Copyright (c) 2017, 2020 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package jakarta.json;

import java.io.Serializable;
import java.util.AbstractMap;
import java.util.Collections;
import java.util.Set;

Private implementation of immutable JsonObject.
Author:Lukas Jungmann
/** * Private implementation of immutable {@link JsonObject}. * * @author Lukas Jungmann */
final class EmptyObject extends AbstractMap<String, JsonValue> implements JsonObject, Serializable { private static final long serialVersionUID = -1461653546889072583L; @Override public Set<Entry<String, JsonValue>> entrySet() { return Collections.<Entry<String, JsonValue>>emptySet(); } @Override public JsonArray getJsonArray(String name) { return (JsonArray) get(name); } @Override public JsonObject getJsonObject(String name) { return (JsonObject) get(name); } @Override public JsonNumber getJsonNumber(String name) { return (JsonNumber) get(name); } @Override public JsonString getJsonString(String name) { return (JsonString) get(name); } @Override public String getString(String name) { return getJsonString(name).getString(); } @Override public String getString(String name, String defaultValue) { return defaultValue; } @Override public int getInt(String name) { return getJsonNumber(name).intValue(); } @Override public int getInt(String name, int defaultValue) { return defaultValue; } @Override public boolean getBoolean(String name) { throw new NullPointerException(); } @Override public boolean getBoolean(String name, boolean defaultValue) { return defaultValue; } @Override public boolean isNull(String name) { throw new NullPointerException(); } @Override public ValueType getValueType() { return ValueType.OBJECT; } // Preserves singleton property private Object readResolve() { return JsonValue.EMPTY_JSON_OBJECT; } }