com.storageroomapp.client.util.JsonSimpleUtil.java Source code

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Here is the source code for com.storageroomapp.client.util.JsonSimpleUtil.java

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/*
Copyright 2013 Peter Laird
    
   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 com.storageroomapp.client.util;

import java.util.Calendar;

import org.json.simple.JSONObject;

/**
 * Parsing helpers for json-simple
 */
public class JsonSimpleUtil {

    /**
     * Convenience method for pulling a String value off of a JSONObject
     * @param obj the JSONObject received from the server
     * @param key the String key of the value we want
     * @return the String value, or null if not found
     */
    static public String parseJsonStringValue(JSONObject obj, String key) {
        if ((obj == null) || (key == null)) {
            return null;
        }
        String value = null;
        Object valueObj = obj.get(key);
        if (valueObj != null) {
            value = valueObj.toString();
        }
        return value;

    }

    /**
     * Convenience method for pulling a Integer value off of a JSONObject
     * @param obj the JSONObject received from the server
     * @param key the String key of the value we want
     * @param defaultValue the Integer to return if a value is not found (can be null)
     * @return the Integer value, or null if not found or not an int
     */
    static public Integer parseJsonIntValue(JSONObject obj, String key, Integer defaultValue) {
        if ((obj == null) || (key == null)) {
            return defaultValue;
        }
        Integer value = defaultValue;
        Object valueObj = obj.get(key);
        if (valueObj != null) {
            String valueStr = valueObj.toString();
            try {
                value = Integer.parseInt(valueStr);
            } catch (NumberFormatException nfe) {
                // TODO log
                value = defaultValue;
            }
        }
        return value;
    }

    /**
     * Convenience method for pulling a Float value off of a JSONObject
     * @param obj the JSONObject received from the server
     * @param key the String key of the value we want
     * @param defaultValue the Float to return if a value is not found (can be null)
     * @return the Float value, or null if not found or not a float
     */
    static public Float parseJsonFloatValue(JSONObject obj, String key, Float defaultValue) {
        if ((obj == null) || (key == null)) {
            return defaultValue;
        }
        Float value = defaultValue;
        Object valueObj = obj.get(key);
        if (valueObj != null) {
            String valueStr = valueObj.toString();
            try {
                value = Float.parseFloat(valueStr);
            } catch (NumberFormatException nfe) {
                // TODO log
                value = defaultValue;
            }
        }
        return value;

    }

    /**
     * Convenience method for pulling a Boolean value off of a JSONObject
     * @param obj the JSONObject received from the server
     * @param key the String key of the value we want
     * @param defaultValue the Boolean to return if a value is not found (can be null)
     * @return the Boolean value, or null if not found or not an boolean
     */
    static public Boolean parseJsonBooleanValue(JSONObject obj, String key, Boolean defaultValue) {
        if ((obj == null) || (key == null)) {
            return defaultValue;
        }
        String value = null;
        Object valueObj = obj.get(key);
        if (valueObj != null) {
            value = valueObj.toString();
        }
        return "true".equals(value);

    }

    /**
     * Convenience method for pulling a Calendar value off of a JSONObject
     * @param obj the JSONObject received from the server
     * @param key the String key of the value we want
     * @return the Calendar value, or null if not found or not a proper timestamp
     */
    static public Calendar parseJsonTimeValue(JSONObject obj, String key) {
        if ((obj == null) || (key == null)) {
            return null;
        }
        Calendar value = null;
        Object valueObj = obj.get(key);
        if (valueObj != null) {
            String valueStr = valueObj.toString();
            value = StorageRoomUtil.storageRoomTimeStringToCalendar(valueStr);
        }
        return value;

    }

    /**
     * Convenience method for pulling a Calendar value off of a JSONObject
     * @param obj the JSONObject received from the server
     * @param key the String key of the value we want
     * @return the Calendar value, or null if not found or not a proper timestamp
     */
    static public Calendar parseJsonDateValue(JSONObject obj, String key) {
        if ((obj == null) || (key == null)) {
            return null;
        }
        Calendar value = null;
        Object valueObj = obj.get(key);
        if (valueObj != null) {
            String valueStr = valueObj.toString();
            value = StorageRoomUtil.storageRoomDateStringToCalendar(valueStr);
        }
        return value;

    }

}