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    • org.camunda.bpm.engine.impl.util.JsonUtil Maven / Gradle / Ivy

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    /* 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.camunda.bpm.engine.impl.util;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.camunda.bpm.engine.impl.json.JsonObjectConverter;
import org.camunda.bpm.engine.impl.util.json.JSONArray;
import org.camunda.bpm.engine.impl.util.json.JSONObject;
import org.joda.time.LocalTime;
import org.joda.time.format.DateTimeFormat;
import org.joda.time.format.DateTimeFormatter;

/**
 * @author Sebastian Menski
 */
public final class JsonUtil {

  /**
   * Converts a {@link JSONObject} to a {@link Map}. It supports nested {@link JSONObject}
   * and {@link JSONArray}.
   *
   * @param jsonObject the json object to convert
   * @return the resulting map
   */
  public static Map jsonObjectAsMap(JSONObject jsonObject) {
    if (jsonObject == null) {
      return null;
    }
    else {
      Map map = new HashMap();
      Iterator keys = jsonObject.keys();
      while (keys.hasNext()) {
        String key = (String) keys.next();
        Object value = optJavaNull(jsonObject.get(key));
        if (JSONObject.class.isInstance(value)) {
          value = jsonObjectAsMap(JSONObject.class.cast(value));
        } else if (JSONArray.class.isInstance(value)) {
          value = jsonArrayAsList(JSONArray.class.cast(value));
        }
        map.put(key, value);
      }
      return map;
    }
  }

  /**
   * Converts a {@link JSONArray} to a {@link List}. It supports nested {@link JSONObject}
   * and {@link JSONArray}.
   *
   * @param jsonArray the json array to convert
   * @return the resulting map
   */
  public static List jsonArrayAsList(JSONArray jsonArray) {
    if (jsonArray == null) {
      return null;
    }
    else {
      List list = new ArrayList();
      for (int i = 0; i < jsonArray.length(); i++) {
        Object value = optJavaNull(jsonArray.get(i));
        if (JSONObject.class.isInstance(value)) {
          value = jsonObjectAsMap(JSONObject.class.cast(value));
        } else if (JSONArray.class.isInstance(value)) {
          value = jsonArrayAsList(JSONArray.class.cast(value));
        }
        list.add(value);
      }
      return list;
    }
  }

  /**
   * Converts a {@link JSONObject#NULL} to a standard Java null.
   *
   * In any other case it just returns the object as provided.
   *
   * @param value the object to convert
   *
   * @return the object as provided or null in case the special
   * marker instance {@link JSONObject#NULL} is provided
   */
  public static Object optJavaNull(Object value) {
      if (JSONObject.NULL == value) {
          return null;
      }
      return value;
  }

  public static void addField(JSONObject json, String name, Object value) {
    if (value != null) {
      json.put(name, value);
    }
  }

  public static  void addField(JSONObject json, String name, JsonObjectConverter converter, T value) {
    if (value != null) {
      json.put(name, converter.toJsonObject(value));
    }
  }

  public static void addDefaultField(JSONObject json, String name, Object defaultValue, Object value) {
    if (value != null && !value.equals(defaultValue)) {
      json.put(name, value);
    }
  }

  public static void addListField(JSONObject json, String name, Collection list) {
    if (list != null) {
      json.put(name, new JSONArray(list));
    }
  }

  public static  void addListField(JSONObject json, String name, JsonObjectConverter converter, List list) {
    if (list != null) {
      List jsonList = new ArrayList();

      for (T item : list) {
        jsonList.add(converter.toJsonObject(item));
      }

      addListField(json, name, jsonList);
    }
  }

  public static void addArrayField(JSONObject json, String name, Object[] array) {
    if (array != null) {
      addListField(json, name, Arrays.asList(array));
    }
  }

  public static void addDateField(JSONObject json, String name, Date date) {
    if (date != null) {
      json.put(name, date.getTime());
    }
  }

  public static Date getDateField(JSONObject json, String name) {
    return new Date(json.getLong(name));
  }

  public static  List jsonArrayAsList(JSONArray jsonArray, JsonObjectConverter converter) {
    List list = new ArrayList();

    for (int i = 0; i < jsonArray.length(); i++) {
      list.add(converter.toObject(jsonArray.getJSONObject(i)));
    }

    return list;
  }

  public static  T jsonObject(JSONObject jsonObject, JsonObjectConverter converter) {
    return converter.toObject(jsonObject);
  }

}
    
    
    
    

    




    
    
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