AEMHeadlessClientPaging.java

/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 ~ Copyright 2021 Adobe
 ~
 ~ Licensed under the Apache License, Version 2.0 (the "License");
 ~ you may not use this file except in compliance with the License.
 ~ You may obtain a copy of the License at
 ~
 ~     http://www.apache.org/licenses/LICENSE-2.0
 ~
 ~ Unless required by applicable law or agreed to in writing, software
 ~ distributed under the License is distributed on an "AS IS" BASIS,
 ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 ~ See the License for the specific language governing permissions and
 ~ limitations under the License.
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
package com.adobe.aem.graphql.clienttest;

import com.adobe.aem.graphql.client.AEMHeadlessClient;
import com.adobe.aem.graphql.client.GraphQlQuery;
import com.adobe.aem.graphql.client.GraphQlQuery.QueryCursor;
import com.adobe.aem.graphql.client.GraphQlResponse;
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import com.fasterxml.jackson.annotation.JsonSetter;

public class AEMHeadlessClientPaging {

	public static class Author {
		private String firstName;
		private String lastName;

		String getFirstName() {
			return firstName;
		}

		void setFirstName(String firstName) {
			this.firstName = firstName;
		}

		String getLastName() {
			return lastName;
		}

		void setLastName(String lastName) {
			this.lastName = lastName;
		}

		@Override
		public String toString() {
			return firstName + " " + lastName;
		}

	}

	@JsonIgnoreProperties(ignoreUnknown = true)
	public static class Article {
		private String path;
		private String title;
		private Author author;

		String getPath() {
			return path;
		}

		@JsonSetter("_path")
		void setPath(String path) {
			this.path = path;
		}

		String getTitle() {
			return title;
		}

		void setTitle(String title) {
			this.title = title;
		}

		Author getAuthor() {
			return author;
		}

		@JsonSetter("authorFragment")
		void setAuthor(Author author) {
			this.author = author;
		}

		@Override
		public String toString() {
			return "Article [path=" + path + ", title=" + title + ", author=" + author + "]";
		}

	}

	public static void main(String args[]) throws Exception {
		
		AEMHeadlessClient client = AEMHeadlessClient
				.builder()
				.endpoint("http://localhost:4502/content/cq:graphql/wknd-shared/endpoint.json")
				.basicAuth("admin", "admin")
				.build();
		
		GraphQlQuery query = client.queryBuilder()
				.contentFragmentModelName("article")
				.fields("_path", "title", "authorFragment { firstName lastName }")
				.sortBy("title ASC", "_path DESC")
				.build();
		
		long pageSize = 3; // to play around

		System.out.println(" *** Run query directly without paging ***");
		GraphQlResponse respDirect = client.runQuery(query);
		for (Article article : respDirect.getItems(Article.class)) {
			System.out.println(article);
		}
		
		System.out.println(" *** Using Paging with Cursor ***");
		QueryCursor cursor = query.getCursor();
		while (cursor.hasMore()) {
			GraphQlResponse resp = cursor.next(pageSize);
			for (Article article : resp.getItems(Article.class)) {
				System.out.println(article);
			}
		}

		System.out.println(" *** Using Paging with offset/limit ***");
		
		GraphQlResponse respPagingOffset;
		for(long pageNo = 0; (respPagingOffset = client.runQuery(query, null, pageNo * pageSize, pageSize)).hasItems(); pageNo++) {
			for (Article article : respPagingOffset.getItems(Article.class)) {
				System.out.println(article);
			}
		}
		
	}

}