era.mi/src/era/mi/logic/Util.java

   1 package era.mi.logic;\r
   2 \r
   3 import java.util.Arrays;\r
   4 \r
   5 import era.mi.logic.types.Bit;\r
   6 \r
   7 public final class Util\r
   8 {\r
   9 \r
  10         @SuppressWarnings("unchecked")\r
  11         public static <T> T[] concat(T[]... arrays)\r
  12         {\r
  13                 if (arrays.length == 0)\r
  14                         throw new IllegalArgumentException("Cannot concatenate 0 arrays.");\r
  15 \r
  16                 int length = 0;\r
  17                 for (T[] array : arrays)\r
  18                         length += array.length;\r
  19 \r
  20                 T[] newArray = Arrays.copyOf(arrays[0], length);\r
  21                 int appendIndex = arrays[0].length;\r
  22                 for (int i = 1; i < arrays.length; i++)\r
  23                 {\r
  24                         System.arraycopy(arrays[i], 0, newArray, appendIndex, arrays[i].length);\r
  25                         appendIndex += arrays[i].length;\r
  26                 }\r
  27 \r
  28                 return newArray;\r
  29         }\r
  30 \r
  31 //      @SuppressWarnings("unchecked")\r
  32 //      public static <T> T[][] split(T[] array, int... lengths)\r
  33 //      {\r
  34 //              //TODO: implement array split again; This version contains an illegal cast\r
  35 //              int totalLength = 0;\r
  36 //              for(int length : lengths)\r
  37 //                      totalLength += length;\r
  38 //              \r
  39 //              if(totalLength != array.length)\r
  40 //                      throw new IllegalArgumentException(); //TODO: add proper error message\r
  41 //              \r
  42 //              Object[][] newArray = new Object[lengths.length][];\r
  43 //              int splitIndex = 0;\r
  44 //              for(int i = 0; i < lengths.length; i++)\r
  45 //              {\r
  46 //                      System.arraycopy(array, splitIndex, newArray, 0, lengths[i]);\r
  47 //                      splitIndex += lengths[i];\r
  48 //              }\r
  49 //              \r
  50 //              return (T[][]) newArray;\r
  51 //      }\r
  52 \r
  53         public static Bit[] and(Bit[] a, Bit[] b)\r
  54         {\r
  55                 return binBitOp(a, b, Bit::and);\r
  56         }\r
  57 \r
  58         public static Bit[] or(Bit[] a, Bit[] b)\r
  59         {\r
  60                 return binBitOp(a, b, Bit::or);\r
  61         }\r
  62 \r
  63         public static Bit[] xor(Bit[] a, Bit[] b)\r
  64         {\r
  65                 return binBitOp(a, b, Bit::xor);\r
  66         }\r
  67 \r
  68         private static Bit[] binBitOp(Bit[] a, Bit[] b, BitOp op)\r
  69         {\r
  70                 if (a.length != b.length)\r
  71                         throw new IllegalArgumentException("Bit Arrays were not of equal length.");\r
  72                 Bit[] out = new Bit[a.length];\r
  73                 for (int i = 0; i < a.length; i++)\r
  74                 {\r
  75                         out[i] = op.execute(a[i], b[i]);\r
  76                 }\r
  77                 return out;\r
  78         }\r
  79 \r
  80         public static Bit[] not(Bit[] a)\r
  81         {\r
  82                 Bit[] out = new Bit[a.length];\r
  83                 for (int i = 0; i < a.length; i++)\r
  84                 {\r
  85                         out[i] = a[i].not();\r
  86                 }\r
  87                 return out;\r
  88         }\r
  89 \r
  90         /**\r
  91          * uses the {@link Bit#combineWith(Bit)} method, does not create a new array, the result is stored in the first array.\r
  92          * \r
  93          * @author Christian Femers\r
  94          */\r
  95         public static Bit[] combineInto(Bit[] dest, Bit[] addition)\r
  96         {\r
  97                 if (dest.length != addition.length)\r
  98                         throw new IllegalArgumentException("Bit Arrays were not of equal length.");\r
  99                 for (int i = 0; i < addition.length; i++)\r
 100                 {\r
 101                         dest[i] = dest[i].join(addition[i]);\r
 102                 }\r
 103                 return dest;\r
 104         }\r
 105 \r
 106         interface BitOp\r
 107         {\r
 108                 Bit execute(Bit a, Bit b);\r
 109         }\r
 110 }\r