org.activiti.rest.util.JSONUtil.java Source code

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Here is the source code for org.activiti.rest.util.JSONUtil.java

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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.activiti.rest.util;

import java.util.Calendar;
import java.util.Date;
import java.util.Map;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.springframework.extensions.surf.util.ISO8601DateFormat;

/**
 * Util class containing methods for handling common JSON operations.
 * 
 * @author Frederik Heremans
 */
public abstract class JSONUtil {

    /**
     * Puts the given value in the {@link JSONObject}. When the value is null,
     * {@link JSONObject#NULL} is put as value, resulting in an explicit NULL
     * value in the rendered JSON output.
     */
    public static void putRetainNull(JSONObject object, String key, Object value) throws JSONException {
        putDefault(object, key, value, JSONObject.NULL);
    }

    /**
     * Puts the given value in the {@link JSONObject}. When the value is null,
     * an empty string is used as value.
     */
    public static void putEmptyStringIfNull(JSONObject object, String key, Object value) throws JSONException {
        putDefault(object, key, value, "");
    }

    public static void putDefault(JSONObject object, String key, Object value, Object defaultValue)
            throws JSONException {
        if (value == null) {
            value = defaultValue;
        }
        object.put(key, value);
    }

    public static void putPagingInfo(JSONObject object, Map<String, Object> model) throws JSONException {
        putDefault(object, "total", model.get("total"), 0L);
        putDefault(object, "start", model.get("start"), 0L);
        putDefault(object, "size", model.get("size"), 0L);
        object.put("sort", model.get("sort"));
        object.put("order", model.get("order"));
    }

    public static JSONObject putNewObject(JSONObject base, String key) throws JSONException {
        JSONObject newObject = new JSONObject();
        base.put(key, newObject);
        return newObject;
    }

    public static JSONArray putNewArray(JSONObject base, String key) throws JSONException {
        JSONArray newArray = new JSONArray();
        base.put(key, newArray);
        return newArray;
    }

    public static String formatISO8601Date(Calendar calendar) {
        if (calendar != null) {
            return ISO8601DateFormat.format(calendar.getTime());
        }
        return null;
    }

    public static String formatISO8601Date(Date date) {
        if (date != null) {
            return ISO8601DateFormat.format(date);
        }
        return null;
    }

}