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Zabbix API library for the Java language.
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/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2014 Suguru Yajima
 *
 * 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.zabbix4j.utils.json;

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.
 * 
 * A JSONStringer instance provides a value method for appending
 * values to the
 * text, and a key
 * method for adding keys before values in objects. There are array
 * and endArray methods that make and bound array values, and
 * object and endObject methods which make and bound
 * object values. All of these methods return the JSONWriter instance,
 * permitting cascade style. For example, 
 * myString = new JSONStringer()
 *     .object()
 *         .key("JSON")
 *         .value("Hello, World!")
 *     .endObject()
 *     .toString();
 which produces the string  * {"JSON":"Hello, World!"}
 * 
 * The first method called must be array or object.
 * 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.
 * 
 * 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 null if there was a
     * problem in the construction of the JSON text (such as the calls to
     * array were not properly balanced with calls to
     * endArray).
     *
     * @return The JSON text.
     */
    public String toString() {
        return this.mode == 'd' ? this.writer.toString() : null;
    }
}