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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.AbstractList;
import java.util.Collections;
import java.util.List;
import java.util.RandomAccess;

/**
 * Private implementation of immutable {@link JsonArray}.
 *
 * @author Lukas Jungmann
 */
final class EmptyArray extends AbstractList
    implements JsonArray, Serializable, RandomAccess {

  private static final long serialVersionUID = 7295439472061642859L;

  @Override
  public JsonValue get(int index) {
    throw new IndexOutOfBoundsException("Index: " + index);
  }

  @Override
  public int size() {
    return 0;
  }

  @Override
  public JsonObject getJsonObject(int index) {
    return (JsonObject) get(index);
  }

  @Override
  public JsonArray getJsonArray(int index) {
    return (JsonArray) get(index);
  }

  @Override
  public JsonNumber getJsonNumber(int index) {
    return (JsonNumber) get(index);
  }

  @Override
  public JsonString getJsonString(int index) {
    return (JsonString) get(index);
  }

  @Override
  public  List getValuesAs(Class clazz) {
    return Collections.emptyList();
  }

  @Override
  public String getString(int index) {
    return getJsonString(index).getString();
  }

  @Override
  public String getString(int index, String defaultValue) {
    return defaultValue;
  }

  @Override
  public int getInt(int index) {
    return getJsonNumber(index).intValue();
  }

  @Override
  public int getInt(int index, int defaultValue) {
    return defaultValue;
  }

  @Override
  public boolean getBoolean(int index) {
    return get(index) == JsonValue.TRUE;
  }

  @Override
  public boolean getBoolean(int index, boolean defaultValue) {
    return defaultValue;
  }

  @Override
  public boolean isNull(int index) {
    return get(index) == JsonValue.NULL;
  }

  @Override
  public ValueType getValueType() {
    return ValueType.ARRAY;
  }

  // Preserves singleton property
  private Object readResolve() {
    return JsonValue.EMPTY_JSON_ARRAY;
  }
}