package innovimax.mixthem.join;

import innovimax.mixthem.exceptions.MixException;
import innovimax.mixthem.interfaces.IJoinLine;

import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;

/**
* <p>Joins two lines on a common field.</p>
* <p>This is the default implementation of IJoinLine.</p>
* @see IJoinLine
* @author Innovimax
* @version 1.0
*/
public class DefaultLineJoining implements IJoinLine {

	@Override
	public String join(String line1, String line2) throws MixException {
		if (line1 != null && line2 != null) {
			List<String> list1 = Arrays.asList(line1.split("\\s"));
			List<String> list2 = Arrays.asList(line2.split("\\s"));
			if (list1.size() > 0 && list2.contains(list1.get(0))) {
				String part1 = list1.stream().collect(Collectors.joining(" "));
				String part2 = list2.stream().filter(s -> !list1.contains(s)).collect(Collectors.joining(" "));
				return part1 + " " + part2;				
			}
		}
		return null;
	}

}

@@ -956,10 +956,271 @@
 ll;%0A%09%7D%0A%0A
+%09@Override%0A%09String join(String line1, String line2, int index) throws MixException %7B%0A%09%09System.out.println(%22join todo%22);%0A%09%7D%0A%0A%09@Override%0A%09String join(String line1, String line2, int index1, int index2) throws MixException %7B%0A%09%09System.out.println(%22join todo%22);%0A%09%7D%0A%0A
 %7D%0A

Update DefaultLineJoining.java