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Release Candidate for Next-Gen Twilio Java Helper Library

There is a newer version: 7.0.0-rc-10

package com.twilio.sdk.resource;

import com.twilio.sdk.TwilioClient;
import com.twilio.sdk.TwilioRestException;
import com.twilio.sdk.TwilioRestResponse;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

public abstract class NextGenListResource extends Resource implements Iterable {

	protected List pageData;
	private String nextPageUrl = null;
	private int page = 0;
	private int pageSize = 0;
	private String previousPageUrl = null;
	private String url = null;

	public NextGenListResource(final C client) {
		this(client, new HashMap());
	}

	public NextGenListResource(final C client, final Map filters) {
		super(client);
		this.filters = filters;
	}

	public Iterator iterator() {
		return new ListIterator(getPageData().iterator());
	}

	public List getPageData() {
		if (!isLoaded()) {
			try {
				load(filters);
			} catch (TwilioRestException e) {
				throw new RuntimeException(e);
			}
		}

		return Collections.unmodifiableList(pageData);
	}

	public String getNextPageUrl() {
		return nextPageUrl;
	}

	public int getPage() {
		return page;
	}

	public int getPageSize() {
		return pageSize;
	}

	public String getPreviousPageUrl() {
		return previousPageUrl;
	}

	public String getUrl() {
		return url;
	}

	protected boolean hasNextPage() {
		return (nextPageUrl != null && nextPageUrl.length() > 0);
	}

	protected void fetchNextPage() throws TwilioRestException {
		TwilioRestResponse response = getClient().get(nextPageUrl);
		parseResponse(response);
	}

	@Override
	protected void parseResponse(TwilioRestResponse response) {
		Map data = response.toMap();
		Map meta = (Map) data.get("meta");
		if (meta == null) {
			throw new RuntimeException("Paging metadata not found in Twilio response");
		}

		nextPageUrl = (String) meta.get("next_page_url");
		previousPageUrl = (String) meta.get("previous_page_url");
		page = getIntValue(meta.get("page"));
		pageSize = getIntValue(meta.get("page_size"));
		url = (String) meta.get("url");

		pageData = toList(response);
	}

	protected List toList(TwilioRestResponse response) {
		List returnList = new ArrayList();

		Map data = response.toMap();
		Map meta = (Map) data.get("meta");

		String resourceKey = (String) meta.get("key");
		Object content = data.get(resourceKey);
		if (content instanceof List) {
			List