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Resizing Generic Arrays in Java in A Generic Way

/ Published in: Java
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  1. package ch.hsr.ifs.liquid.util;
  2.  
  3. import static java.lang.System.arraycopy;
  4.  
  5. import java.lang.reflect.Array;
  6.  
  7. public class Arrays {
  8. 	private static final int ENLARGE_FACTOR = 2;
  9.  
  10. 	public static <T> T[] enlargeArray(T[] array) {
  11. 		T[] enlargedArray = initArray(array, array.length * ENLARGE_FACTOR);
  12. 		arraycopy(array, 0, enlargedArray, 0, array.length);
  13. 		return enlargedArray;
  14. 	}
  15.  
  16. 	public static <T> T[] trimArray(T[] array, int length) {
  17. 		T[] trimmedArray = initArray(array, length);
  18. 		arraycopy(array, 0, trimmedArray, 0, length);
  19. 		return trimmedArray;
  20. 	}
  21.  
  22. 	public static <T> T[] composeArray(T[] array1, T[] array2) {
  23. 		int length1 = array1.length;
  24. 		int length2 = array2.length;
  25.  
  26. 		T[] composedArray = initArray(array1, length1 + length2);
  27.  
  28. 		arraycopy(array1, 0, composedArray, 0, length1);
  29. 		arraycopy(array2, 0, composedArray, length1, length2);
  30.  
  31. 		return composedArray;
  32. 	}
  33.  
  34. 	@SuppressWarnings("unchecked")
  35. 	private static <T> T[] initArray(T[] array, int newSize) {
  36. 		return (T[]) Array.newInstance(array.getClass().getComponentType(), newSize);
  37. 	}
  38. }

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