Pagination.java

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package com.dreamfirestudios.dreamcore.DreamSmartInvs.content;
 
import com.dreamfirestudios.dreamcore.DreamSmartInvs.ClickableItem;
 
import java.util.Arrays;
 
public interface Pagination {
 
    ClickableItem[] getPageItems();
 
    int getPage();
    Pagination page(int page);
 
    boolean isFirst();
    boolean isLast();
 
    Pagination first();
    Pagination previous();
    Pagination next();
    Pagination last();
 
    Pagination addToIterator(SlotIterator iterator);
 
    Pagination setItems(ClickableItem... items);
    Pagination setItemsPerPage(int itemsPerPage);
 
 
    class Impl implements Pagination {
 
        private int currentPage;
 
        private ClickableItem[] items = new ClickableItem[0];
        private int itemsPerPage = 5;
 
        @Override
        public ClickableItem[] getPageItems() {
            return Arrays.copyOfRange(items,
                    currentPage * itemsPerPage,
                    (currentPage + 1) * itemsPerPage);
        }
 
        @Override
        public int getPage() {
            return this.currentPage;
        }
 
        @Override
        public Pagination page(int page) {
            this.currentPage = page;
            return this;
        }
 
        @Override
        public boolean isFirst() {
            return this.currentPage == 0;
        }
 
        @Override
        public boolean isLast() {
            int pageCount = (int) Math.ceil((double) this.items.length / this.itemsPerPage);
            return this.currentPage >= pageCount - 1;
        }
 
        @Override
        public Pagination first() {
            this.currentPage = 0;
            return this;
        }
 
        @Override
        public Pagination previous() {
            if(!isFirst())
                this.currentPage--;
 
            return this;
        }
 
        @Override
        public Pagination next() {
            if(!isLast())
                this.currentPage++;
 
            return this;
        }
 
        @Override
        public Pagination last() {
            this.currentPage = this.items.length / this.itemsPerPage;
            return this;
        }
 
        @Override
        public Pagination addToIterator(SlotIterator iterator) {
            for(ClickableItem item : getPageItems()) {
                iterator.next().set(item);
 
                if(iterator.ended())
                    break;
            }
 
            return this;
        }
 
        @Override
        public Pagination setItems(ClickableItem... items) {
            this.items = items;
            return this;
        }
 
        @Override
        public Pagination setItemsPerPage(int itemsPerPage) {
            this.itemsPerPage = itemsPerPage;
            return this;
        }
 
    }
 
}