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+package com.vaadin.external.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 shall be used for Good, not Evil.
+
+ 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(&quot;JSON&quot;).value(&quot;Hello, World!&quot;)
+ *         .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.
+     */
+    @Override
+    public String toString() {
+        return this.mode == 'd' ? this.writer.toString() : null;
+    }
+}