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A Java client implementation to the WordPress WP-API v2 plugin.
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package com.afrozaar.wordpress.wpapi.v2.response;

import com.afrozaar.wordpress.wpapi.v2.Strings;
import com.afrozaar.wordpress.wpapi.v2.request.Request;

import org.springframework.http.HttpHeaders;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.net.URI;
import java.util.List;
import java.util.Objects;
import java.util.Optional;
import java.util.function.Function;

public class PagedResponse {

    final Class clazz;

    public static final Function, String> NEXT = response -> response.getNext().get();
    public static final Function, String> PREV = response -> response.getPrevious().get();

    private static final Logger LOG = LoggerFactory.getLogger(PagedResponse.class);
    // captures the state of a response from wordpress
    final String self;
    final String next;
    final String previous;
    final int pages;
    final List list;

    public PagedResponse(Class clazz, String self, String next, String previous, int pages, List list) {
        this.clazz = clazz;
        this.self = self;
        this.next = next;
        this.previous = previous;
        this.pages = pages;
        this.list = list;
    }

    public boolean hasNext() {
        return Objects.nonNull(next);
    }

    public Optional getNext() {
        return Optional.ofNullable(next);
    }

    public boolean hasPrevious() {
        return Objects.nonNull(previous);
    }

    public Optional getPrevious() {
        return Optional.ofNullable(previous);
    }

    public String getSelf() {
        return self;
    }

    public List getList() {
        return list;
    }

    public void debug() {
        LOG.trace("response.self      = {}", this.self);
        LOG.trace("response.prev      = {}", this.previous);
        LOG.trace("response.next      = {}", this.next);
        LOG.trace("response.pages     = {}", this.pages);
        LOG.trace("response.list.size = {}", this.list.size());
    }

    public URI getUri(Function, String> direction) {
        return Request.fromLink(direction.apply(this));
    }

    public Class getClazz() {
        return clazz;
    }

    public static class Builder {
        private String next;
        // captures the state of a response from wordpress
        private String self;
        private String previous;
        private List posts;
        private int pages;
        private Class t1;

        private Builder(Class t1) {
            this.t1 = t1;
        }

        public static  Builder aPagedResponse(Class t) {
            return new Builder<>(t);
        }

        public Builder withNext(Optional next) {
            next.ifPresent(n -> this.next = n);
            return this;
        }

        public Builder withSelf(String self) {
            this.self = self;
            return this;
        }

        public Builder withPrevious(Optional previous) {
            previous.ifPresent(p -> this.previous = p);
            return this;
        }

        public Builder withPosts(List posts) {
            this.posts = posts;
            return this;
        }

        public PagedResponse build() {
            return new PagedResponse<>(t1, self, next, previous, pages, posts);
        }

        public Builder withPages(int pages) {
            this.pages = pages;
            return this;
        }

        public Builder withPages(HttpHeaders headers) {
            headers.get(Strings.HEADER_TOTAL_PAGES).stream()
                    .findFirst()
                    .ifPresent(pages -> Builder.this.withPages(Integer.valueOf(pages)));
            return this;
        }
    }
}