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src/main/java/com/github/mmolimar/kafka/connect/fs/file/reader/AgnosticFileReader.java
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package com.github.mmolimar.kafka.connect.fs.file.reader; | ||
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import com.github.mmolimar.kafka.connect.fs.file.Offset; | ||
import com.github.mmolimar.kafka.connect.fs.util.ReflectionUtils; | ||
import org.apache.hadoop.fs.FileSystem; | ||
import org.apache.hadoop.fs.Path; | ||
import org.apache.kafka.connect.data.Struct; | ||
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import java.io.IOException; | ||
import java.util.Arrays; | ||
import java.util.List; | ||
import java.util.Map; | ||
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import static com.github.mmolimar.kafka.connect.fs.FsSourceTaskConfig.FILE_READER_PREFIX; | ||
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public class AgnosticFileReader extends AbstractFileReader<AgnosticFileReader.AgnosticRecord> { | ||
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private static final String FILE_READER_AGNOSTIC = FILE_READER_PREFIX + "agnostic."; | ||
private static final String FILE_READER_AGNOSTIC_EXTENSIONS = FILE_READER_AGNOSTIC + "extensions."; | ||
public static final String FILE_READER_AGNOSTIC_EXTENSIONS_PARQUET = FILE_READER_AGNOSTIC_EXTENSIONS + "parquet"; | ||
public static final String FILE_READER_AGNOSTIC_EXTENSIONS_AVRO = FILE_READER_AGNOSTIC_EXTENSIONS + "avro"; | ||
public static final String FILE_READER_AGNOSTIC_EXTENSIONS_SEQUENCE = FILE_READER_AGNOSTIC_EXTENSIONS + "sequence"; | ||
public static final String FILE_READER_AGNOSTIC_EXTENSIONS_DELIMITED = FILE_READER_AGNOSTIC_EXTENSIONS + "delimited"; | ||
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private final AbstractFileReader reader; | ||
private List<String> parquetExtensions, avroExtensions, sequenceExtensions, delimitedExtensions; | ||
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public AgnosticFileReader(FileSystem fs, Path filePath, Map<String, Object> config) throws IOException { | ||
super(fs, filePath, new AgnosticAdapter(), config); | ||
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try { | ||
reader = (AbstractFileReader) readerByExtension(fs, filePath, config); | ||
} catch (RuntimeException | IOException e) { | ||
throw e; | ||
} catch (Throwable t) { | ||
throw new IOException("An error has ocurred when creating a concrete reader", t); | ||
} | ||
} | ||
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private FileReader readerByExtension(FileSystem fs, Path filePath, Map<String, Object> config) | ||
throws Throwable { | ||
int index = filePath.getName().lastIndexOf('.'); | ||
String extension = index == -1 || index == filePath.getName().length() - 1 ? "" : | ||
filePath.getName().substring(index + 1).toLowerCase(); | ||
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Class<? extends FileReader> clz; | ||
if (parquetExtensions.contains(extension)) { | ||
clz = ParquetFileReader.class; | ||
} else if (avroExtensions.contains(extension)) { | ||
clz = AvroFileReader.class; | ||
} else if (sequenceExtensions.contains(extension)) { | ||
clz = SequenceFileReader.class; | ||
} else if (delimitedExtensions.contains(extension)) { | ||
clz = DelimitedTextFileReader.class; | ||
} else { | ||
clz = TextFileReader.class; | ||
} | ||
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return ReflectionUtils.makeReader(clz, fs, filePath, config); | ||
} | ||
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@Override | ||
protected void configure(Map<String, Object> config) { | ||
this.parquetExtensions = config.get(FILE_READER_AGNOSTIC_EXTENSIONS_PARQUET) == null ? | ||
Arrays.asList("parquet") : | ||
Arrays.asList(config.get(FILE_READER_AGNOSTIC_EXTENSIONS_PARQUET).toString().toLowerCase().split(",")); | ||
this.avroExtensions = config.get(FILE_READER_AGNOSTIC_EXTENSIONS_AVRO) == null ? | ||
Arrays.asList("avro") : | ||
Arrays.asList(config.get(FILE_READER_AGNOSTIC_EXTENSIONS_AVRO).toString().toLowerCase().split(",")); | ||
this.sequenceExtensions = config.get(FILE_READER_AGNOSTIC_EXTENSIONS_SEQUENCE) == null ? | ||
Arrays.asList("seq") : | ||
Arrays.asList(config.get(FILE_READER_AGNOSTIC_EXTENSIONS_SEQUENCE).toString().toLowerCase().split(",")); | ||
this.delimitedExtensions = config.get(FILE_READER_AGNOSTIC_EXTENSIONS_DELIMITED) == null ? | ||
Arrays.asList("tsv", "csv") : | ||
Arrays.asList(config.get(FILE_READER_AGNOSTIC_EXTENSIONS_DELIMITED).toString().toLowerCase().split(",")); | ||
} | ||
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@Override | ||
public boolean hasNext() { | ||
return reader.hasNext(); | ||
} | ||
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@Override | ||
public void seek(Offset offset) { | ||
reader.seek(offset); | ||
} | ||
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@Override | ||
public Offset currentOffset() { | ||
return reader.currentOffset(); | ||
} | ||
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@Override | ||
public void close() throws IOException { | ||
reader.close(); | ||
} | ||
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@Override | ||
protected AgnosticRecord nextRecord() { | ||
return new AgnosticRecord(reader.getAdapter(), reader.nextRecord()); | ||
} | ||
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static class AgnosticAdapter implements ReaderAdapter<AgnosticRecord> { | ||
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public AgnosticAdapter() { | ||
} | ||
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@Override | ||
public Struct apply(AgnosticRecord ag) { | ||
return ag.adapter.apply(ag.record); | ||
} | ||
} | ||
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static class AgnosticRecord { | ||
private final ReaderAdapter<Object> adapter; | ||
private final Object record; | ||
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public AgnosticRecord(ReaderAdapter<Object> adapter, Object record) { | ||
this.adapter = adapter; | ||
this.record = record; | ||
} | ||
} | ||
} |
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