| /* |
| * 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.Arrays; |
| import java.util.Iterator; |
| import java.util.Map; |
| |
| import org.apache.sling.api.resource.Resource; |
| import org.apache.sling.api.resource.ResourceResolver; |
| import org.apache.sling.api.resource.ValueMap; |
| import org.apache.sling.graphql.samples.website.models.SlingWrappers; |
| |
| import graphql.schema.DataFetcher; |
| import graphql.schema.DataFetchingEnvironment; |
| |
| /** Retrieve additional information for our articles 'seeAlso' field */ |
| class SeeAlsoDataFetcher implements DataFetcher<Object> { |
| |
| public static final String NAME = "seeAlso"; |
| |
| private final Resource resource; |
| |
| SeeAlsoDataFetcher(Resource r) { |
| this.resource = r; |
| } |
| |
| /** For "see also", our articles have just the article name but no path or section. |
| * This maps those names (which are Sling Resource names) to their Resource, so |
| * we can use the full path + title to render links. |
| */ |
| private static Map<String, Object> toArticleRef(ResourceResolver resolver, String nodeName) { |
| final String jcrQuery = "/jcr:root/content/articles//" + nodeName; |
| final Iterator<Resource> it = resolver.findResources(jcrQuery, "xpath"); |
| |
| // We want exactly one result |
| if(!it.hasNext()) { |
| throw new RuntimeException("No Resource found:" + jcrQuery); |
| } |
| final Map<String, Object> result = SlingWrappers.resourceWrapper(it.next()); |
| if(it.hasNext()) { |
| throw new RuntimeException("More than one Resource found:" + jcrQuery); |
| } |
| |
| return result; |
| } |
| |
| @Override |
| public Object get(DataFetchingEnvironment env) throws Exception { |
| |
| // Our "see also" field only contains node names - this demonstrates |
| // using a query to get their full paths |
| // |
| final ValueMap vm = FetcherUtil.getSourceResource(env, resource).adaptTo(ValueMap.class); |
| if(vm != null) { |
| return Arrays |
| .stream(vm.get(NAME, String[].class)) |
| .map(it -> toArticleRef(resource.getResourceResolver(), it)) |
| .toArray(); |
| } |
| return null; |
| } |
| } |