3 import java.util.Arrays;
5 public final class Util
8 @SuppressWarnings("unchecked")
9 public static <T> T[] concat(T[]... arrays)
11 if (arrays.length == 0)
12 throw new IllegalArgumentException("Cannot concatenate 0 arrays.");
15 for (T[] array : arrays)
16 length += array.length;
18 T[] newArray = Arrays.copyOf(arrays[0], length);
19 int appendIndex = arrays[0].length;
20 for (int i = 1; i < arrays.length; i++)
22 System.arraycopy(arrays[i], 0, newArray, appendIndex, arrays[i].length);
23 appendIndex += arrays[i].length;
29 // @SuppressWarnings("unchecked")
30 // public static <T> T[][] split(T[] array, int... lengths)
32 // //TODO: implement array split again; This version contains an illegal cast
33 // int totalLength = 0;
34 // for(int length : lengths)
35 // totalLength += length;
37 // if(totalLength != array.length)
38 // throw new IllegalArgumentException(); //TODO: add proper error message
40 // Object[][] newArray = new Object[lengths.length][];
41 // int splitIndex = 0;
42 // for(int i = 0; i < lengths.length; i++)
44 // System.arraycopy(array, splitIndex, newArray, 0, lengths[i]);
45 // splitIndex += lengths[i];
48 // return (T[][]) newArray;
51 public static Bit[] and(Bit[] a, Bit[] b)
53 return binBitOp(a, b, (bA, bB) -> Bit.and(bA, bB));
56 public static Bit[] or(Bit[] a, Bit[] b)
58 return binBitOp(a, b, (bA, bB) -> Bit.or(bA, bB));
61 public static Bit[] xor(Bit[] a, Bit[] b)
63 return binBitOp(a, b, (bA, bB) -> Bit.xor(bA, bB));
66 private static Bit[] binBitOp(Bit[] a, Bit[] b, BitOp op)
68 if (a.length != b.length)
69 throw new IllegalArgumentException("Bit Arrays were not of equal length.");
70 Bit[] out = new Bit[a.length];
71 for (int i = 0; i < a.length; i++)
73 out[i] = op.execute(a[i], b[i]);
78 public static Bit[] not(Bit[] a)
80 Bit[] out = new Bit[a.length];
81 for (int i = 0; i < a.length; i++)
90 Bit execute(Bit a, Bit b);