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/*
 * 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 {@link JsonObject}.
 *
 * @author Lukas Jungmann
 */
final class EmptyObject extends AbstractMap implements JsonObject, Serializable {

  private static final long serialVersionUID = -1461653546889072583L;

  @Override
  public Set> entrySet() {
    return Collections.>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;
  }
}