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GitLab4J-API (gitlab4j-api) provides a full featured Java client library for working with GitLab repositories and servers via the GitLab REST API.

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package org.gitlab4j.api;

import java.util.Collections;
import java.util.Iterator;
import java.util.Spliterator;
import java.util.function.Consumer;

class PagerSpliterator implements Spliterator {

	private Pager pager;

	private Iterator elements;

	PagerSpliterator(Pager pager) {
		this.pager = pager;
		if (pager.hasNext()) {
			elements = this.pager.next().iterator();
		} else {
			elements = Collections.emptyIterator();
		}
	}

	@Override
	public boolean tryAdvance(Consumer action) {
		if (action == null) {
			throw new NullPointerException("Action is null");
		}
		if (elements.hasNext()) {
			action.accept(elements.next());
			return true;
		} else if (pager.hasNext()) {
			elements = pager.next().iterator();
			if(elements.hasNext()) {
				action.accept(elements.next());
				return true;
			}
		}
		return false;
	}

	@Override
	public Spliterator trySplit() {
		return null;
	}

	@Override
	public long estimateSize() {
		return pager.getTotalItems();
	}

	@Override
	public int characteristics() {
		return SIZED | NONNULL;
	}
}