64 lines
2.3 KiB
Java
64 lines
2.3 KiB
Java
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package eu.dnetlib.doiboost.crossref;
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import java.io.BufferedOutputStream;
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import java.net.URI;
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import java.util.zip.GZIPOutputStream;
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import org.apache.commons.compress.archivers.tar.TarArchiveEntry;
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import org.apache.commons.compress.archivers.tar.TarArchiveInputStream;
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import org.apache.commons.compress.compressors.gzip.GzipCompressorInputStream;
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import org.apache.commons.io.IOUtils;
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import org.apache.hadoop.conf.Configuration;
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import org.apache.hadoop.fs.FSDataInputStream;
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import org.apache.hadoop.fs.FSDataOutputStream;
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import org.apache.hadoop.fs.FileSystem;
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import org.apache.hadoop.fs.Path;
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import org.mortbay.log.Log;
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import eu.dnetlib.dhp.application.ArgumentApplicationParser;
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public class ExtractCrossrefRecords {
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public static void main(String[] args) throws Exception {
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final ArgumentApplicationParser parser = new ArgumentApplicationParser(
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IOUtils
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.toString(
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ExtractCrossrefRecords.class
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.getResourceAsStream(
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"/eu/dnetlib/dhp/doiboost/crossref_dump_reader/crossref_dump_reader.json")));
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parser.parseArgument(args);
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final String hdfsServerUri = parser.get("hdfsServerUri");
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final String workingPath = hdfsServerUri.concat(parser.get("workingPath"));
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final String outputPath = parser.get("outputPath");
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final String crossrefFileNameTarGz = parser.get("crossrefFileNameTarGz");
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Path hdfsreadpath = new Path(workingPath.concat("/").concat(crossrefFileNameTarGz));
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Configuration conf = new Configuration();
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conf.set("fs.defaultFS", workingPath);
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conf.set("fs.hdfs.impl", org.apache.hadoop.hdfs.DistributedFileSystem.class.getName());
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conf.set("fs.file.impl", org.apache.hadoop.fs.LocalFileSystem.class.getName());
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FileSystem fs = FileSystem.get(URI.create(workingPath), conf);
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FSDataInputStream crossrefFileStream = fs.open(hdfsreadpath);
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try (TarArchiveInputStream tais = new TarArchiveInputStream(
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new GzipCompressorInputStream(crossrefFileStream))) {
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TarArchiveEntry entry = null;
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while ((entry = tais.getNextTarEntry()) != null) {
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if (!entry.isDirectory()) {
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try (
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FSDataOutputStream out = fs
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.create(new Path(outputPath.concat(entry.getName()).concat(".gz")));
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GZIPOutputStream gzipOs = new GZIPOutputStream(new BufferedOutputStream(out))) {
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IOUtils.copy(tais, gzipOs);
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}
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}
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}
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}
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Log.info("Crossref dump reading completed");
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}
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}
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