package org.json; | |
/******************************************************************************* | |
* Copyright (c) 2006 JSON.org | |
* | |
* 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. | |
******************************************************************************/ | |
import java.io.StringWriter; | |
/** | |
* JSONStringer provides a quick and convenient way of producing JSON text. | |
* The texts produced strictly conform to JSON syntax rules. No whitespace is | |
* added, so the results are ready for transmission or storage. Each instance of | |
* JSONStringer can produce one JSON text. | |
* <p> | |
* A JSONStringer instance provides a <code>value</code> method for appending | |
* values to the | |
* text, and a <code>key</code> | |
* method for adding keys before values in objects. There are <code>array</code> | |
* and <code>endArray</code> methods that make and bound array values, and | |
* <code>object</code> and <code>endObject</code> methods which make and bound | |
* object values. All of these methods return the JSONWriter instance, | |
* permitting cascade style. For example, <pre> | |
* myString = new JSONStringer() | |
* .object() | |
* .key("JSON") | |
* .value("Hello, World!") | |
* .endObject() | |
* .toString();</pre> which produces the string <pre> | |
* {"JSON":"Hello, World!"}</pre> | |
* <p> | |
* The first method called must be <code>array</code> or <code>object</code>. | |
* There are no methods for adding commas or colons. JSONStringer adds them for | |
* you. Objects and arrays can be nested up to 20 levels deep. | |
* <p> | |
* This can sometimes be easier than using a JSONObject to build a string. | |
* | |
* @author JSON.org | |
* @version 2008-09-18 | |
*/ | |
public class JSONStringer extends JSONWriter { | |
/** | |
* Make a fresh JSONStringer. It can be used to build one JSON text. | |
*/ | |
public JSONStringer() { | |
super(new StringWriter()); | |
} | |
/** | |
* Return the JSON text. This method is used to obtain the product of the | |
* JSONStringer instance. It will return <code>null</code> if there was a | |
* problem in the construction of the JSON text (such as the calls to | |
* <code>array</code> were not properly balanced with calls to | |
* <code>endArray</code>). | |
* | |
* @return The JSON text. | |
*/ | |
public String toString() { | |
return this.mode == 'd' ? this.writer.toString() : null; | |
} | |
} |