content: /**
   * Copyright (C) 2010-2016 eBusiness Information, Excilys Group
   * Copyright (C) 2016-2020 the AndroidAnnotations project
   *
   * Licensed under the Apache License, Version 2.0 (the "License"); you may not
   * use this file except in compliance with the License. You may obtain a copy of
   * the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed To in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
   * License for the specific language governing permissions and limitations under
   * the License.
   */
  package org.androidannotations.helper;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  public final class CaseHelper {
  
  	private static final Pattern PATTERN = Pattern.compile("([A-Z]|[a-z])[a-z0-9]*");
  
  	private CaseHelper() {
  	}
  
  	public static String camelCaseToSnakeCase(String camelCase) {
  
  		List<String> tokens = new ArrayList<>();
  		Matcher matcher = PATTERN.matcher(camelCase);
  		String acronym = "";
  		while (matcher.find()) {
  			String found = matcher.group();
  			if (found.matches("^[A-Z]$")) {
  				acronym += found;
  			} else {
  				if (acronym.length() > 0) {
  					// we have an acronym to add before we continue
  					tokens.add(acronym);
  					acronym = "";
  				}
  				tokens.add(found.toLowerCase());
  			}
  		}
  		if (acronym.length() > 0) {
  			tokens.add(acronym);
  		}
  		if (tokens.size() > 0) {
  			StringBuilder sb = new StringBuilder(tokens.remove(0));
  			for (String s : tokens) {
  				sb.append("_").append(s);
  			}
  			return sb.toString();
  		} else {
  			return camelCase;
  		}
  	}
  
  	public static String camelCaseToUpperSnakeCase(String camelCase) {
  		return camelCaseToSnakeCase(camelCase).toUpperCase();
  	}
  
  	public static String lowerCaseFirst(String string) {
  		if (string.length() < 2) {
  			return string.toLowerCase();
  		}
  		String first = string.substring(0, 1).toLowerCase();
  		String end = string.substring(1, string.length());
  		return first + end;
  	}
  
  	public static String upperCaseFirst(String string) {
  		if (string.length() < 2) {
  			return string.toUpperCase();
  		}
  		String first = string.substring(0, 1).toUpperCase();
  		String end = string.substring(1, string.length());
  		return first + end;
  	}
  
  	public static String camelCaseToUpperSnakeCase(String prefix, String camelCase, String suffix) {
  		if (prefix != null && !camelCase.startsWith(prefix)) {
  			camelCase = prefix + "_" + camelCase;
  		}
  		if (suffix != null && !camelCase.toLowerCase().endsWith(suffix.toLowerCase())) {
  			camelCase = camelCase + "_" + suffix;
  		}
  		return camelCaseToUpperSnakeCase(camelCase);
  	}
  
  }
  