CR-MesoLabs-OOP-DuplicateDeleter-BlueJ/IntegerDuplicateDeleter.java

 
import java.util.Arrays;

public class IntegerDuplicateDeleter extends DuplicateDeleter<Integer>{
    private Integer[] temp;
    public IntegerDuplicateDeleter(Integer[] array) {
        super(array);
        temp = Arrays.copyOf(array, array.length);
    }
    
    public Integer[] removeDuplicates(int maxNumberOfDuplications){
        
        int numberValsRemoved = 0;
        int index = 0;
        
        while (index < array.length) {
            int currValueCount = countCurrValue(index, array[index]);
            if (currValueCount >= maxNumberOfDuplications) {
                removeCurrValue(index, currValueCount);
                numberValsRemoved += currValueCount;
            }  
            index += currValueCount;
        }

        return buildReturnArray(numberValsRemoved); 
    }
    
    public Integer[] removeDuplicatesExactly(int exactNumberOfDuplications){
        int numberValsRemoved = 0;
        int index = 0;
        
        while (index < array.length) {
            int currValueCount = countCurrValue(index, array[index]);
            if (currValueCount == exactNumberOfDuplications) {
                removeCurrValue(index, currValueCount);
                numberValsRemoved += currValueCount;
            }  
            index += currValueCount;
        }

        return buildReturnArray(numberValsRemoved); 
    }
    
    private int countCurrValue(int index, Integer value) {
        int count = 0;
        while (true) {
            if (index < array.length && array[index] == value) {
                count++;
                index++;
            }
            else break;
        }
        return count; 
    }
    
    private void removeCurrValue(int index, int currValueCount) {
        for (int j = index + currValueCount - 1; j >= index ; j--) {
            temp[j] = null;
        }
    }
    
    private Integer[] buildReturnArray(int numberValsRemoved) {
        Integer[] newArray = new Integer[array.length - numberValsRemoved];
        int newArrayPos = 0; 
        
        for (int i = 0; i < temp.length; i++) {
            if (temp[i] != null) {
                newArray[newArrayPos] = temp[i];
                newArrayPos++;
            }
        }
        
        temp = Arrays.copyOf(array, array.length);
        return newArray;
    }
}