| /* |
| * 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.cms.transformer.internal; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.apache.sling.api.resource.Resource; |
| import org.apache.sling.cms.transformer.OutputFileFormat; |
| import org.apache.sling.cms.transformer.ThumbnailProvider; |
| import org.apache.sling.cms.transformer.Transformation; |
| import org.apache.sling.cms.transformer.TransformationHandler; |
| import org.apache.sling.cms.transformer.Transformer; |
| import org.osgi.service.component.annotations.Component; |
| import org.osgi.service.component.annotations.Reference; |
| import org.osgi.service.component.annotations.ReferenceCardinality; |
| import org.osgi.service.component.annotations.ReferencePolicyOption; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import com.google.common.collect.Lists; |
| |
| import net.coobird.thumbnailator.Thumbnails; |
| import net.coobird.thumbnailator.Thumbnails.Builder; |
| |
| @Component(service = Transformer.class) |
| public class TransformerImpl implements Transformer { |
| |
| private static final Logger log = LoggerFactory.getLogger(TransformerImpl.class); |
| |
| @Reference(cardinality = ReferenceCardinality.AT_LEAST_ONE, policyOption = ReferencePolicyOption.GREEDY) |
| private List<TransformationHandler> handlers; |
| |
| @Reference(cardinality = ReferenceCardinality.AT_LEAST_ONE, policyOption = ReferencePolicyOption.GREEDY) |
| private List<ThumbnailProvider> thumbnailProviders; |
| |
| public void addThumbnailProvider(ThumbnailProvider thumbnailProvider) { |
| if (thumbnailProviders == null) { |
| thumbnailProviders = new ArrayList<>(); |
| } |
| this.thumbnailProviders.add(thumbnailProvider); |
| } |
| |
| public void addTransformationHandler(TransformationHandler handler) { |
| if (handlers == null) { |
| handlers = new ArrayList<>(); |
| } |
| handlers.add(handler); |
| } |
| |
| public List<TransformationHandler> getHandlers() { |
| return handlers; |
| } |
| |
| private ThumbnailProvider getThumbnailProvider(Resource resource) throws IOException { |
| return Lists.reverse(thumbnailProviders).stream().filter(tp -> tp.applies(resource)).findFirst() |
| .orElseThrow(() -> new IOException("Unable to find thumbnail provider for: " + resource.getPath())); |
| } |
| |
| /** |
| * @return the thumbnailProviders |
| */ |
| public List<ThumbnailProvider> getThumbnailProviders() { |
| return thumbnailProviders; |
| } |
| |
| public TransformationHandler getTransformationHandler(String resourceType) { |
| return handlers.stream().filter(h -> resourceType.equals(h.getResourceType())).findFirst().orElse(null); |
| } |
| |
| @Override |
| public void transform(Resource resource, Transformation transformation, OutputFileFormat format, OutputStream out) |
| throws IOException { |
| ThumbnailProvider provider = getThumbnailProvider(resource); |
| log.debug("Using thumbnail provider {} for resource {}", provider, resource); |
| Builder<? extends InputStream> builder = Thumbnails.of(provider.getThumbnail(resource)); |
| for (Resource config : transformation.getHandlers()) { |
| log.debug("Handling command: {}", config); |
| TransformationHandler handler = getTransformationHandler(config.getResourceType()); |
| if (handler != null) { |
| log.debug("Invoking handler {} for command {}", handler.getClass().getCanonicalName(), |
| config.getName()); |
| handler.handle(builder, config); |
| } else { |
| log.info("No handler found for: {}", config.getName()); |
| } |
| } |
| builder.outputFormat(format.toString()); |
| builder.toOutputStream(out); |
| |
| } |
| |
| } |