Elimate Code Duplication in DefaultRedisList

[kjb512]

There is code duplication in the DefaultRedisList methods. Specifically, the usage of listOps.rightPush/leftPush followed by a call to cap() is repeated in multiple places. This can be refactored to enhance code maintainability and readability.

	@Override
	public boolean add(E value) {
		listOps.rightPush(value);
		cap();
		return true;
	}

	@Override
	public boolean offer(E element) {
		listOps.rightPush(element);
		cap();
		return true;
	}

	@Override
	public void addFirst(E element) {
		listOps.leftPush(element);
		cap();
	}

	@Override
	public void add(int index, E element) {

		if (index == 0) {
			listOps.leftPush(element);
			cap();
			return;
		}

		int size = size();

		if (index == size()) {
			listOps.rightPush(element);
			cap();
			return;
		}

		if (index < 0 || index > size) {
			throw new IndexOutOfBoundsException();
		}

		throw new IllegalArgumentException("Redis supports insertion only at the beginning or the end of the list");
	}

Proposed Solution:

To enhance consistency and readability, I propose refactoring the method names to addFirst and addLast. This will provide a clear indication of where the element is being added, compared to the more generic add.

AS-IS

	@Override
	public void add(int index, E element) {

		if (index == 0) {
			listOps.leftPush(element);
			cap();
			return;
		}

		int size = size();

		if (index == size()) {
			listOps.rightPush(element);
			cap();
			return;
		}

		if (index < 0 || index > size) {
			throw new IndexOutOfBoundsException();
		}

		throw new IllegalArgumentException("Redis supports insertion only at the beginning or the end of the list");
	}

TO-BE

	@Override
	public void add(int index, E element) {

		if (index == 0) {
			addFirst(element);
			return;
		}

		int size = size();

		if (index == size()) {
			addLast(element);
			return;
		}

		if (index < 0 || index > size) {
			throw new IndexOutOfBoundsException();
		}

		throw new IllegalArgumentException("Redis supports insertion only at the beginning or the end of the list");
	}