| /* |
| * 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 org.apache.sling.api.resource.Resource; |
| 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 articles which have a given tag or set of tags */ |
| class TagQueryDataFetcher implements DataFetcher<Object> { |
| |
| public static final String NAME = "tagQuery"; |
| |
| private final Resource resource; |
| |
| TagQueryDataFetcher(Resource r) { |
| this.resource = r; |
| } |
| |
| static String jcrQuery(String ... tags) { |
| // Build a query like |
| // /jcr:root/content/articles//*[@tags = "panel" and @tags = "card"] |
| final StringBuilder sb = new StringBuilder("/jcr:root" + Constants.ARTICLES_ROOT + "//*["); |
| for(int i=0 ; i < tags.length; i++) { |
| if(i > 0) { |
| sb.append(" and "); |
| } |
| sb.append("@tags=\"").append(tags[i]).append("\""); |
| } |
| sb.append("]"); |
| return sb.toString(); |
| } |
| |
| @Override |
| public Object get(DataFetchingEnvironment environment) throws Exception { |
| final Map<String, Object> result = new HashMap<>(); |
| final List<Map<String, Object>> articles = new ArrayList<>(); |
| final ValueMap vm = resource.adaptTo(ValueMap.class); |
| if(vm != null) { |
| final String [] tags = vm.get("tags", String[].class); |
| if(tags != null) { |
| result.put("articles", articles); |
| result.put("query", tags); |
| |
| final Iterator<Resource> it = resource.getResourceResolver().findResources(jcrQuery(tags), "xpath"); |
| // TODO should stop/paginate if too many results |
| while(it.hasNext()) { |
| articles.add(SlingWrappers.resourceWrapper(it.next())); |
| } |
| } |
| } |
| return result; |
| } |
| } |