| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.sling.graphql.samples.website.datafetchers; |
| |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.stream.StreamSupport; |
| |
| import org.apache.sling.api.resource.Resource; |
| import org.apache.sling.api.resource.ValueMap; |
| import org.apache.sling.graphql.api.SlingDataFetcher; |
| import org.apache.sling.graphql.api.SlingDataFetcherEnvironment; |
| import org.apache.sling.graphql.samples.website.models.SlingWrappers; |
| import org.osgi.service.component.annotations.Component; |
| |
| /** |
| * Retrieve navigation information for our website: sections, content root etc. |
| */ |
| @Component(service = SlingDataFetcher.class, property = {"name=website/navigation"}) |
| public class NavigationDataFetcher implements SlingDataFetcher<Object> { |
| |
| private Object[] getSections(Resource r) { |
| final List<Map<String, Object>> result = new ArrayList<>(); |
| final Resource root = r.getResourceResolver().getResource(Constants.ARTICLES_ROOT); |
| final Iterable<Resource> it = () -> root.getResourceResolver().getChildren(root).iterator(); |
| StreamSupport.stream(it.spliterator(), false) |
| .forEach(child -> result.add(SlingWrappers.resourceWrapper(child))); |
| return result.toArray(); |
| |
| } |
| |
| String getNextOrPreviousPath(Resource r, String propertyName, String currentValue, boolean isNext) { |
| String result = null; |
| final String jcrQuery = String.format("/jcr:root%s//*[%s %s '%s'] order by %s %s", Constants.ARTICLES_ROOT, |
| propertyName, isNext ? ">" : "<", currentValue, propertyName, isNext ? "ascending" : "descending"); |
| final Iterator<Resource> it = r.getResourceResolver().findResources(jcrQuery, "xpath"); |
| if (it.hasNext()) { |
| result = it.next().getPath(); |
| } |
| return result; |
| } |
| |
| /** |
| * If r is an article, add previous/next navigation based on article filenames |
| */ |
| private void maybeAddPrevNext(Map<String, Object> result, Resource r) { |
| final String propName = "filename"; |
| if (Constants.ARTICLE_RESOURCE_SUPERTYPE.equals(r.getResourceSuperType())) { |
| final String filename = r.adaptTo(ValueMap.class).get(propName, String.class); |
| if (filename != null) { |
| result.put("previous", getNextOrPreviousPath(r, propName, filename, false)); |
| result.put("next", getNextOrPreviousPath(r, propName, filename, true)); |
| } |
| } |
| } |
| |
| @Override |
| public Object get(SlingDataFetcherEnvironment env) throws Exception { |
| final Map<String, Object> result = new HashMap<>(); |
| result.put("root", Constants.ARTICLES_ROOT); |
| result.put("sections", getSections(env.getCurrentResource())); |
| result.put("search", Constants.SEARCH_PAGE_PATH); |
| maybeAddPrevNext(result, FetcherUtil.getSourceResource(env)); |
| return result; |
| } |
| } |