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Implementation of the JSON Schema Core Draft v4 specification built with the org.json API

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/*
 * Copyright (C) 2011 Everit Kft. (http://www.everit.org)
 *
 * 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 org.everit.json.schema;

import java.util.Arrays;
import java.util.Objects;

import org.json.JSONArray;
import org.json.JSONObject;

/**
 * Deep-equals implementation on primitive wrappers, {@link JSONObject} and {@link JSONArray}.
 */
public final class ObjectComparator {

  /**
   * Deep-equals implementation on primitive wrappers, {@link JSONObject} and {@link JSONArray}.
   *
   * @param obj1
   *          the first object to be inspected
   * @param obj2
   *          the second object to be inspected
   * @return {@code true} if the two objects are equal, {@code false} otherwise
   */
  public static boolean deepEquals(final Object obj1, final Object obj2) {
    if (obj1 instanceof JSONArray) {
      if (!(obj2 instanceof JSONArray)) {
        return false;
      }
      return deepEqualArrays((JSONArray) obj1, (JSONArray) obj2);
    } else if (obj1 instanceof JSONObject) {
      if (!(obj2 instanceof JSONObject)) {
        return false;
      }
      return deepEqualObjects((JSONObject) obj1, (JSONObject) obj2);
    }
    return Objects.equals(obj1, obj2);
  }

  private static boolean deepEqualArrays(final JSONArray arr1, final JSONArray arr2) {
    if (arr1.length() != arr2.length()) {
      return false;
    }
    for (int i = 0; i < arr1.length(); ++i) {
      if (!deepEquals(arr1.get(i), arr2.get(i))) {
        return false;
      }
    }
    return true;
  }

  private static boolean deepEqualObjects(final JSONObject jsonObj1, final JSONObject jsonObj2) {
    String[] obj1Names = JSONObject.getNames(jsonObj1);
    if (!Arrays.equals(obj1Names, JSONObject.getNames(jsonObj2))) {
      return false;
    }
    if (obj1Names == null) {
      return true;
    }
    for (String name : obj1Names) {
      if (!deepEquals(jsonObj1.get(name), jsonObj2.get(name))) {
        return false;
      }
    }
    return true;
  }

  private ObjectComparator() {
  }

}