1 files changed, 95 insertions, 0 deletions
diff --git a/opendc-format/src/main/kotlin/org/opendc/format/util/LocalOutputFile.kt b/opendc-format/src/main/kotlin/org/opendc/format/util/LocalOutputFile.kt
new file mode 100644
index 00000000..657bca5a
--- /dev/null
+++ b/opendc-format/src/main/kotlin/org/opendc/format/util/LocalOutputFile.kt
@@ -0,0 +1,95 @@
+/*
+ * 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.format.util
+
+import org.apache.parquet.io.OutputFile
+import org.apache.parquet.io.PositionOutputStream
+import java.io.File
+import java.io.OutputStream
+import java.nio.file.Files
+import java.nio.file.Path
+import java.nio.file.StandardOpenOption
+
+/**
+ * An [OutputFile] on the local filesystem.
+ */
+public class LocalOutputFile(private val path: Path) : OutputFile {
+    /**
+     * Construct a [LocalOutputFile] from the specified [file]
+     */
+    public constructor(file: File) : this(file.toPath())
+
+    override fun create(blockSizeHint: Long): PositionOutputStream {
+        val output = Files.newOutputStream(path, StandardOpenOption.CREATE_NEW, StandardOpenOption.WRITE)
+        return NioPositionOutputStream(output)
+    }
+
+    override fun createOrOverwrite(blockSizeHint: Long): PositionOutputStream {
+        val output = Files.newOutputStream(path, StandardOpenOption.CREATE, StandardOpenOption.WRITE, StandardOpenOption.TRUNCATE_EXISTING)
+        return NioPositionOutputStream(output)
+    }
+
+    override fun supportsBlockSize(): Boolean = false
+
+    override fun defaultBlockSize(): Long =
+        throw UnsupportedOperationException("Local filesystem does not have default block size")
+
+    override fun getPath(): String = path.toString()
+
+    /**
+     * Implementation of [PositionOutputStream] for an [OutputStream].
+     */
+    private class NioPositionOutputStream(private val output: OutputStream) : PositionOutputStream() {
+        /**
+         * The current position in the file.
+         */
+        private var _pos = 0L
+
+        override fun getPos(): Long = _pos
+
+        override fun write(b: Int) {
+            output.write(b)
+            _pos++
+        }
+
+        override fun write(b: ByteArray) {
+            output.write(b)
+            _pos += b.size
+        }
+
+        override fun write(b: ByteArray, off: Int, len: Int) {
+            output.write(b, off, len)
+            _pos += len
+        }
+
+        override fun flush() {
+            output.flush()
+        }
+
+        override fun close() {
+            output.close()
+        }
+
+        override fun toString(): String = "NioPositionOutputStream[output=$output]"
+    }
+}