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/*
* Copyright (c) 2021 AtLarge Research
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package org.opendc.trace.util.parquet
import org.apache.parquet.io.InputFile
import org.apache.parquet.io.SeekableInputStream
import java.io.EOFException
import java.io.File
import java.nio.ByteBuffer
import java.nio.channels.FileChannel
import java.nio.file.Path
import java.nio.file.StandardOpenOption
/**
* An [InputFile] on the local filesystem.
*/
public class LocalInputFile(private val path: Path) : InputFile {
/**
* The [FileChannel] used for accessing the input path.
*/
private val channel = FileChannel.open(path, StandardOpenOption.READ)
/**
* Construct a [LocalInputFile] for the specified [file].
*/
public constructor(file: File) : this(file.toPath())
override fun getLength(): Long = channel.size()
override fun newStream(): SeekableInputStream =
object : SeekableInputStream() {
override fun read(buf: ByteBuffer): Int {
return channel.read(buf)
}
override fun read(): Int {
val single = ByteBuffer.allocate(1)
var read: Int
// ReadableByteChannel#read might read zero bytes so continue until we read at least one byte
do {
read = channel.read(single)
} while (read == 0)
return if (read == -1) {
read
} else {
single.get(0).toInt() and 0xff
}
}
override fun getPos(): Long {
return channel.position()
}
override fun seek(newPos: Long) {
channel.position(newPos)
}
override fun readFully(bytes: ByteArray) {
readFully(ByteBuffer.wrap(bytes))
}
override fun readFully(
bytes: ByteArray,
start: Int,
len: Int,
) {
readFully(ByteBuffer.wrap(bytes, start, len))
}
override fun readFully(buf: ByteBuffer) {
var remainder = buf.remaining()
while (remainder > 0) {
val read = channel.read(buf)
remainder -= read
if (read == -1 && remainder > 0) {
throw EOFException()
}
}
}
override fun close() {
channel.close()
}
override fun toString(): String = "NioSeekableInputStream"
}
override fun toString(): String = "LocalInputFile[path=$path]"
}
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