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Attempting to make parquet support better for windows.
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/* | ||
* Copyright (c) 2010-2020 Haifeng Li. All rights reserved. | ||
* | ||
* Smile is free software: you can redistribute it and/or modify | ||
* it under the terms of the GNU Lesser General Public License as | ||
* published by the Free Software Foundation, either version 3 of | ||
* the License, or (at your option) any later version. | ||
* | ||
* Smile is distributed in the hope that it will be useful, | ||
* but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
* GNU Lesser General Public License for more details. | ||
* | ||
* You should have received a copy of the GNU Lesser General Public License | ||
* along with Smile. If not, see <https://www.gnu.org/licenses/>. | ||
*/ | ||
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package tech.v3.dataset; | ||
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import java.io.EOFException; | ||
import java.io.FileNotFoundException; | ||
import java.io.IOException; | ||
import java.io.RandomAccessFile; | ||
import java.nio.ByteBuffer; | ||
import java.nio.file.Path; | ||
import org.apache.parquet.io.InputFile; | ||
import org.apache.parquet.io.SeekableInputStream; | ||
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/** | ||
* Parquet InputFile with a local java.nio.Path. | ||
* Adapted from https://github.com/tideworks/arvo2parquet | ||
* | ||
* @author Haifeng Li | ||
* @hacks Chris Nuernberger | ||
*/ | ||
public class LocalInputFile implements InputFile { | ||
/** Local file object. */ | ||
private final RandomAccessFile input; | ||
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/** | ||
* Constructor. | ||
* @param path the input file path. | ||
* @throws FileNotFoundException when file cannot be found. | ||
*/ | ||
public LocalInputFile(Path path) throws FileNotFoundException { | ||
input = new RandomAccessFile(path.toFile(), "r"); | ||
} | ||
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@Override | ||
public long getLength() throws IOException { | ||
return input.length(); | ||
} | ||
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@Override | ||
public SeekableInputStream newStream() throws IOException { | ||
return new SeekableInputStream() { | ||
private final byte[] page = new byte[8192]; | ||
private long markPos = 0; | ||
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@Override | ||
public int read() throws IOException { | ||
return input.read(); | ||
} | ||
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@Override | ||
public int read(byte[] b) throws IOException { | ||
return input.read(b); | ||
} | ||
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@Override | ||
public int read(byte[] b, int off, int len) throws IOException { | ||
return input.read(b, off, len); | ||
} | ||
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@Override | ||
public long skip(long n) throws IOException { | ||
final long savPos = input.getFilePointer(); | ||
final long amtLeft = input.length() - savPos; | ||
n = Math.min(n, amtLeft); | ||
final long newPos = savPos + n; | ||
input.seek(newPos); | ||
final long curPos = input.getFilePointer(); | ||
return curPos - savPos; | ||
} | ||
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@Override | ||
public int available() { | ||
return 0; | ||
} | ||
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@Override | ||
public void close() throws IOException { | ||
input.close(); | ||
} | ||
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@SuppressWarnings({"unchecked", "unused", "UnusedReturnValue"}) | ||
private <T extends Throwable, R> R uncheckedExceptionThrow(Throwable t) throws T { | ||
throw (T) t; | ||
} | ||
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@Override | ||
public synchronized void mark(int readlimit) { | ||
try { | ||
markPos = input.getFilePointer(); | ||
} catch (IOException e) { | ||
uncheckedExceptionThrow(e); | ||
} | ||
} | ||
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@Override | ||
public synchronized void reset() throws IOException { | ||
input.seek(markPos); | ||
} | ||
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@Override | ||
public boolean markSupported() { | ||
return true; | ||
} | ||
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@Override | ||
public long getPos() throws IOException { | ||
return input.getFilePointer(); | ||
} | ||
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@Override | ||
public void seek(long l) throws IOException { | ||
input.seek(l); | ||
} | ||
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@Override | ||
public void readFully(byte[] bytes) throws IOException { | ||
input.readFully(bytes); | ||
} | ||
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@Override | ||
public void readFully(byte[] bytes, int i, int i1) throws IOException { | ||
input.readFully(bytes, i, i1); | ||
} | ||
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@Override | ||
public int read(ByteBuffer byteBuffer) throws IOException { | ||
return readDirectBuffer(byteBuffer, page, input::read); | ||
} | ||
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@Override | ||
public void readFully(ByteBuffer byteBuffer) throws IOException { | ||
readFullyDirectBuffer(byteBuffer, page, input::read); | ||
} | ||
}; | ||
} | ||
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private interface ByteBufferReader { | ||
int read(byte[] b, int off, int len) throws IOException; | ||
} | ||
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private int readDirectBuffer(ByteBuffer byteBuffer, byte[] page, ByteBufferReader reader) throws IOException { | ||
// copy all the bytes that return immediately, stopping at the first | ||
// read that doesn't return a full buffer. | ||
int nextReadLength = Math.min(byteBuffer.remaining(), page.length); | ||
int totalBytesRead = 0; | ||
int bytesRead; | ||
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while ((bytesRead = reader.read(page, 0, nextReadLength)) == page.length) { | ||
byteBuffer.put(page); | ||
totalBytesRead += bytesRead; | ||
nextReadLength = Math.min(byteBuffer.remaining(), page.length); | ||
} | ||
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if (bytesRead < 0) { | ||
// return -1 if nothing was read | ||
return totalBytesRead == 0 ? -1 : totalBytesRead; | ||
} else { | ||
// copy the last partial buffer | ||
byteBuffer.put(page, 0, bytesRead); | ||
totalBytesRead += bytesRead; | ||
return totalBytesRead; | ||
} | ||
} | ||
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private static void readFullyDirectBuffer(ByteBuffer byteBuffer, byte[] page, ByteBufferReader reader) throws IOException { | ||
int nextReadLength = Math.min(byteBuffer.remaining(), page.length); | ||
int bytesRead = 0; | ||
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while (nextReadLength > 0 && (bytesRead = reader.read(page, 0, nextReadLength)) >= 0) { | ||
byteBuffer.put(page, 0, bytesRead); | ||
nextReadLength = Math.min(byteBuffer.remaining(), page.length); | ||
} | ||
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if (bytesRead < 0 && byteBuffer.remaining() > 0) { | ||
throw new EOFException("Reached the end of stream with " + byteBuffer.remaining() + " bytes left to read"); | ||
} | ||
} | ||
} |
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