code: /*
   Copyright 1995-2015 Esri
  
     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.
  
   For additional information, contact:
   Environmental Systems Research Institute, Inc.
   Attn: Contracts Dept
   380 New York Street
   Redlands, California, USA 92373
  
   email: contracts@esri.com
   */
  package com.esri.core.geometry;
  import java.util.Locale;
  
  class StringUtils {
  
      static void appendDouble(double value, int precision,
              StringBuilder stringBuilder) {
          if (precision < 0) {
              precision = 0;
          } else if (precision > 17) {
              precision = 17;
          }
  
          String format = "%." + precision + "g";
  
          String str_dbl = String.format(Locale.US, format, value);
  
          boolean b_found_dot = false;
          boolean b_found_exponent = false;
  
          for (int i = 0; i < str_dbl.length(); i++) {
              char c = str_dbl.charAt(i);
  
              if (c == '.') {
                  b_found_dot = true;
              } else if (c == 'e' || c == 'E') {
                  b_found_exponent = true;
                  break;
              }
          }
  
          if (b_found_dot && !b_found_exponent) {
              StringBuilder buffer = removeTrailingZeros_(str_dbl);
              stringBuilder.append(buffer);
          } else {
              stringBuilder.append(str_dbl);
          }
      }
  
      static void appendDoubleF(double value, int decimals,
              StringBuilder stringBuilder) {
          if (decimals < 0) {
              decimals = 0;
          } else if (decimals > 17) {
              decimals = 17;
          }
  
          String format = "%." + decimals + "f";
  
          String str_dbl = String.format(Locale.US, format, value);
  
          boolean b_found_dot = false;
  
          for (int i = 0; i < str_dbl.length(); i++) {
              char c = str_dbl.charAt(i);
  
              if (c == '.') {
                  b_found_dot = true;
                  break;
              }
          }
  
          if (b_found_dot) {
              StringBuilder buffer = removeTrailingZeros_(str_dbl);
              stringBuilder.append(buffer);
          } else {
              stringBuilder.append(str_dbl);
          }
      }
  
      static private StringBuilder removeTrailingZeros_(String str_dbl) {
          StringBuilder buffer = new StringBuilder(str_dbl);
          int non_zero = buffer.length() - 1;
  
          while (buffer.charAt(non_zero) == '0') {
              non_zero--;
          }
  
          buffer.delete(non_zero + 1, buffer.length());
  
          if (buffer.charAt(non_zero) == '.') {
              buffer.deleteCharAt(non_zero);
          }
  
          return buffer;
      }
  }
  