001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.juneau.commons.bean;
018
019import static java.lang.Character.*;
020import static org.apache.juneau.commons.utils.Shorts.*;
021
022/**
023 * Converts property names to dashed-upper-case-start format.
024 *
025 * <h5 class='section'>Example:</h5>
026 * <ul>
027 *    <li><js>"fooBar"</js> -&gt; <js>"Foo-Bar"</js>
028 *    <li><js>"fooBarURL"</js> -&gt; <js>"Foo-Bar-Url"</js>
029 *    <li><js>"FooBarURL"</js> -&gt; <js>"Foo-Bar-Url"</js>
030 * </ul>
031 *
032 */
033public class PropertyNamerDUCS implements PropertyNamer {
034
035   /** Reusable instance. */
036   public static final PropertyNamer INSTANCE = new PropertyNamerDUCS();
037
038   @Override /* Overridden from PropertyNamer */
039   @SuppressWarnings({
040      "java:S3776" // Cognitive complexity acceptable for property name conversion logic
041   })
042   public String getPropertyName(String name) {
043      if (ie(name))
044         return name;
045
046      var numUCs = 0;
047      var isPrevUC = isUpperCase(name.charAt(0));
048      for (var i = 1; i < name.length(); i++) {
049         var c = name.charAt(i);
050         if (isUpperCase(c)) {
051            if (! isPrevUC)
052               numUCs++;
053            isPrevUC = true;
054         } else {
055            isPrevUC = false;
056         }
057      }
058
059      var name2 = new char[name.length() + numUCs];
060      isPrevUC = true;
061      var ni = 0;
062      for (var i = 0; i < name.length(); i++) {
063         var c = name.charAt(i);
064         if (i == 0) {
065            name2[ni++] = toUpperCase(c);
066         } else {
067            if (isUpperCase(c)) {
068               if (! isPrevUC) {
069                  name2[ni++] = '-';
070                  name2[ni++] = toUpperCase(c);
071               } else {
072                  name2[ni++] = toLowerCase(c);
073               }
074               isPrevUC = true;
075            } else {
076               isPrevUC = false;
077               name2[ni++] = c;
078            }
079         }
080      }
081
082      return new String(name2);
083   }
084}