| /* |
| * 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; |
| |
| import org.apache.sling.api.resource.Resource; |
| import org.apache.sling.pipes.PipeBindings; |
| import org.apache.sling.pipes.Plumber; |
| |
| import java.util.Collections; |
| import java.util.Iterator; |
| |
| /** |
| * executes a pipe referred in the configuration, but invert output: |
| * nothing if the pipe has something, input if the pipe has nothing |
| */ |
| public class NotPipe extends ReferencePipe { |
| |
| public static final String RESOURCE_TYPE = RT_PREFIX + "not"; |
| |
| public NotPipe(Plumber plumber, Resource resource, PipeBindings upperBindings) { |
| super(plumber, resource, upperBindings); |
| } |
| |
| @Override |
| protected Iterator<Resource> computeReferredOutput() { |
| if (reference.getOutput().hasNext()){ |
| return EMPTY_ITERATOR; |
| } |
| return Collections.singleton(getInput()).iterator(); |
| } |
| } |