| /* |
| * 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.pipes.internal.slingquery; |
| |
| import org.apache.sling.api.resource.Resource; |
| import org.apache.sling.pipes.BasePipe; |
| import org.apache.sling.pipes.PipeBindings; |
| import org.apache.sling.pipes.Plumber; |
| import org.apache.sling.query.SlingQuery; |
| import java.util.Iterator; |
| |
| /** |
| * deals with common sling query pipe code |
| */ |
| public abstract class AbstractSlingQueryPipe extends BasePipe { |
| |
| public AbstractSlingQueryPipe(Plumber plumber, Resource resource, PipeBindings upperBindings) throws Exception { |
| super(plumber, resource, upperBindings); |
| } |
| @Override |
| public boolean modifiesContent() { |
| return false; |
| } |
| |
| /** |
| * generates a sling query object out of a resource |
| * @param resource input resource |
| * @return SlingQuery object |
| */ |
| protected abstract SlingQuery getQuery(Resource resource); |
| |
| /** |
| * generate outputs out of input resource and abstract query |
| * @return output's resource iterator, empty in case input is null |
| */ |
| protected Iterator<Resource> computeOutput() throws Exception { |
| Resource resource = getInput(); |
| if (resource != null) { |
| SlingQuery query = getQuery(resource); |
| return query.iterator(); |
| } |
| return EMPTY_ITERATOR; |
| } |
| } |