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StringJsonUtils.java
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StringJsonUtils.java
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/*
* Copyright (c) 2010-2020 Mark Allen, Norbert Bartels.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package com.restfb.util;
/**
* Helper class to encapsulate simple checks used in the DefaultJsonMapper.
*/
public class StringJsonUtils {
private StringJsonUtils() {
// nothing here, prevent class instantiation
}
public static final String EMPTY_OBJECT = "{}";
/**
* Is the given JSON equivalent to the empty list (<code>[]</code>)?
*
* @param jsonString
* The JSON to check.
* @return {@code true} if the JSON is equivalent to the empty list, {@code false} otherwise.
*/
public static boolean isEmptyList(String jsonString) {
return "[]".equals(jsonString);
}
/**
* Checks if the given String start with a <code>[</code> character, so it may be a JsonArray
*
* @param jsonString
* the JSON to check.
* @return {@code true} if the String may be a JSON Array
*/
public static boolean isList(String jsonString) {
return jsonString != null && jsonString.startsWith("[");
}
/**
* Checks if the given String is equals to the String with the content {@code "null"}
*
* @param jsonString
* the JSON to check.
* @return {@code true} if the String is {@code "null"}
*/
public static boolean isNull(String jsonString) {
return "null".equals(jsonString);
}
/**
* Checks if the given String is equals to the String with the content {@code "false"}
*
* @param jsonString
* the JSON to check.
* @return {@code true} if the String is {@code "false"}
*/
public static boolean isFalse(String jsonString) {
return "false".equals(jsonString);
}
/**
* Checks if the given String start with a <code>{</code> character, so it may be a JsonObject
*
* @param jsonString
* the JSON to check.
* @return {@code true} if the String may be a JSON object
*/
public static boolean isObject(String jsonString) {
return jsonString != null && jsonString.startsWith("{");
}
/**
* Is the given JSON equivalent to the empty object (<code>{}</code>)?
*
* @param jsonString
* The JSON to check.
* @return {@code true} if the JSON is equivalent to the empty object, {@code false} otherwise.
*/
public static boolean isEmptyObject(String jsonString) {
return EMPTY_OBJECT.equals(jsonString);
}
}