util/StrUtil.java

   1
   2 package org.de.metux.util;
   3
   4 public class StrUtil
   5 {
   6     public static boolean isEmpty(String str[])
   7     {
   8         if ((str==null)||(str.length==0))
   9             return true;
  10
  11         for (int x=0; x<str.length; x++)
  12             if (!isEmpty(str[x]))
  13                 return false;
  14
  15         return true;
  16     }
  17
  18     public static boolean isEmpty(String str)
  19     {
  20         if ((str==null)||(str.length()==0))
  21             return true;
  22
  23         str = str.trim();
  24         if (str.length()==0)
  25             return true;
  26
  27         return false;
  28     }
  29
  30     public static String fix_notnull(String str)
  31     {
  32         if (str==null)
  33             return "";
  34         else
  35             return str;
  36     }
  37
  38     public static String fold(String[] str)
  39     {
  40         if (str==null)
  41             return "";
  42
  43         String res = "";
  44         for (int x=0; x<str.length; x++)
  45             if (str[x]!=null)
  46                 res += ((res.length()==0) ? "" : " ")+str[x];
  47
  48         return res;
  49     }
  50
  51     public static boolean toBool(String str, boolean def)
  52     {
  53         try
  54         {
  55             return toBool(str);
  56         }
  57         catch (NumberFormatException e)
  58         {
  59             return def;
  60         }
  61     }
  62
  63     public static boolean toBool(String str)
  64         throws NumberFormatException
  65     {
  66         str = str.toLowerCase();
  67
  68         if (str.equals("yes")           ||
  69             str.equals("on")            ||
  70             str.equals("enabled")       ||
  71             str.equals("1")             ||
  72             str.equals("true"))
  73             return true;
  74
  75         if (str.equals("no")            ||
  76             str.equals("off")           ||
  77             str.equals("disabled")      ||
  78             str.equals("0")             ||
  79             str.equals("false"))
  80             return false;
  81
  82         throw new NumberFormatException(str);
  83     }
  84
  85     public String[] trim(String s[])
  86     {
  87         if (s==null)
  88             return null;
  89         if (s.length==0)
  90             return s;
  91
  92         int sz = 0;
  93         for (int x=0; x<s.length; x++)
  94         {
  95             s[x] = s[x].trim();
  96             if (!isEmpty(s[x]))
  97                 sz++;
  98         }
  99
 100         String n[] = new String[sz];
 101         int y = 0;
 102         for (int x=0; x<s.length; x++)
 103             if (!isEmpty(s[x]))
 104                 n[y++] = s[x];
 105
 106         return n;
 107     }
 108 }