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  1. import java.util.*;
  2.  
  3.     class LegacyGlueifier
  4.     {
  5.         public static void main(String[] args)
  6.         {
  7.             HashMap<String, String> derp = new HashMap<String, String>();
  8.             derp.put("key1", "1,2,3,4");
  9.             derp.put("key2", "5,6");
  10.             derp.put("key3", "7,8,9,A");
  11.             System.out.println(generateLegacyDataset(derp));
  12.         }
  13.  
  14.         private LegacyGlueifier()
  15.         {
  16.         }
  17.  
  18.         public static String generateLegacyDataset(Map<String, String> data)
  19.         {
  20.             final ArrayList<ArrayList<String>> lists = new ArrayList<ArrayList<String>>();
  21.             final int width = data.size();
  22.  
  23.             int i = 0;
  24.             for (Map.Entry<String, String> entry : data.entrySet())
  25.             {
  26.                 String[] values = entry.getValue().split(",");
  27.                 changeDims(lists, width, values.length + 1);
  28.  
  29.                 for (int j = 0; j < values.length; ++j) setValue(lists, j + 1, i, values[j]);
  30.                 setValue(lists, 0, i, entry.getKey());
  31.                 ++i;
  32.             }
  33.  
  34.             return stringify(lists);
  35.         }
  36.  
  37.         private static void changeDims(ArrayList<ArrayList<String>> lists, int width, int newHeight)
  38.         {
  39.             while (lists.size() < newHeight) lists.add(arrayListOfSize(width));
  40.         }
  41.  
  42.         private static ArrayList<String> arrayListOfSize(int w)
  43.         {
  44.             ArrayList<String> list = new ArrayList<String>(w);
  45.             while (list.size() < w) list.add(null);
  46.             return list;
  47.         }
  48.  
  49.         private static void setValue(ArrayList<ArrayList<String>> lists, int row, int col, String val)
  50.         {
  51.             ArrayList<String> temp = lists.get(row);
  52.             temp.set(col, val);
  53.             // System.out.println("SET: " + row + " " + col + ": " + val);
  54.         }
  55.  
  56.         private static String swapNullWithEmpty(String s)
  57.         {
  58.             if (s == null) return "";
  59.             return s;
  60.         }
  61.  
  62.         private static String stringify(ArrayList<ArrayList<String>> lists)
  63.         {
  64.             StringBuilder sb = new StringBuilder();
  65.             for (ArrayList<String> sublist : lists)
  66.             {
  67.                 if (sublist.size() != 0) sb.append(swapNullWithEmpty(sublist.get(0)));
  68.                 for (int i = 1; i < sublist.size(); ++i)
  69.                     sb.append("|").append(swapNullWithEmpty(sublist.get(i)));
  70.                 sb.append("\n");
  71.             }
  72.  
  73.             return sb.toString();
  74.         }
  75.     }
Success #stdin #stdout 0.03s 245632KB
comments (?)
stdin
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Standard input is empty
stdout
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key3|key2|key1
7|5|1
8|6|2
9||3
A||4
https://ideone.com/rQVAVE
language:
Java (HotSpot 12)
created:
11 years ago
visibility:
secret

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