| /* |
| * 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.gobblin.data.management.copy; |
| |
| import com.google.common.base.Function; |
| import com.google.common.collect.Iterators; |
| import com.google.common.collect.Maps; |
| import org.apache.gobblin.data.management.partition.FileSet; |
| import org.apache.gobblin.dataset.Dataset; |
| import java.io.IOException; |
| import java.util.Collection; |
| import java.util.Iterator; |
| import java.util.Map; |
| |
| import javax.annotation.Nonnull; |
| import javax.annotation.Nullable; |
| import lombok.AllArgsConstructor; |
| import org.apache.hadoop.fs.FileSystem; |
| |
| |
| /** |
| * Wraps a {@link CopyableDataset} to produce an {@link IterableCopyableDataset}. |
| */ |
| @AllArgsConstructor |
| public class IterableCopyableDatasetImpl implements IterableCopyableDataset { |
| |
| private final CopyableDataset dataset; |
| |
| @Override |
| public Iterator<FileSet<CopyEntity>> getFileSetIterator(FileSystem targetFs, CopyConfiguration configuration) |
| throws IOException { |
| return partitionCopyableFiles(this.dataset, this.dataset.getCopyableFiles(targetFs, configuration)); |
| } |
| |
| @Override |
| public String datasetURN() { |
| return this.dataset.datasetURN(); |
| } |
| |
| private static Iterator<FileSet<CopyEntity>> partitionCopyableFiles(Dataset dataset, |
| Collection<? extends CopyEntity> files) { |
| Map<String, FileSet.Builder<CopyEntity>> partitionBuildersMaps = Maps.newHashMap(); |
| for (CopyEntity file : files) { |
| if (!partitionBuildersMaps.containsKey(file.getFileSet())) { |
| partitionBuildersMaps.put(file.getFileSet(), new FileSet.Builder<>(file.getFileSet(), dataset)); |
| } |
| partitionBuildersMaps.get(file.getFileSet()).add(file); |
| } |
| return Iterators.transform(partitionBuildersMaps.values().iterator(), |
| new Function<FileSet.Builder<CopyEntity>, FileSet<CopyEntity>>() { |
| @Nullable |
| @Override |
| public FileSet<CopyEntity> apply(@Nonnull FileSet.Builder<CopyEntity> input) { |
| return input.build(); |
| } |
| }); |
| } |
| } |