1 /*
   2  * Copyright (c) 2016, 2019, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package jdk.management.jfr;
  27 /**
  28  * Helper class for generating toString()
  29  *
  30  */
  31 final class Stringifier {
  32     private final StringBuilder sb = new StringBuilder();
  33     private boolean first = true;
  34 
  35     public void add(String name, Object value) {
  36         if (first) {
  37             first = false;
  38         } else {
  39             sb.append(" ");
  40         }
  41         boolean isString = value instanceof String;
  42         sb.append(name).append("=");
  43         if (value == null) {
  44             sb.append("null");
  45         } else {
  46             if (isString) {
  47                 sb.append("\"");
  48             }
  49             sb.append(value);
  50             if (isString) {
  51                 sb.append("\"");
  52             }
  53         }
  54     }
  55 
  56     @Override
  57     public String toString() {
  58         return sb.toString();
  59     }
  60 }