org.apache.iceberg.DataFileCollector Maven / Gradle / Ivy
/*
* Copyright (C) 2020 Dremio
*
* Licensed 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.iceberg;
import java.io.IOException;
import java.util.List;
import java.util.stream.Stream;
import java.util.stream.StreamSupport;
import org.apache.iceberg.io.FileIO;
/**
* Utility to get at the manifest files to retrieve data file list. Not publicly exposed by Iceberg.
*/
public final class DataFileCollector {
private DataFileCollector(){
}
/**
* retrieve all data files from a set of manifest files.
*/
public static Stream dataFiles(FileIO io, List allManifests) {
return allManifests.stream().flatMap(manifest -> {
try (ManifestReader reader = ManifestFiles.open(manifest, io)) {
return StreamSupport.stream(reader.entries().spliterator(), false).map(entry -> entry.file().path().toString());
} catch (IOException e) {
throw new RuntimeException(String.format("Failed to read manifest file: %s", manifest.path()), e);
}
});
}
}