2 files changed, 220 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]"
+    }
+}
diff --git a/opendc-format/src/test/kotlin/org/opendc/format/util/ParquetTest.kt b/opendc-format/src/test/kotlin/org/opendc/format/util/ParquetTest.kt
new file mode 100644
index 00000000..e496dd96
--- /dev/null
+++ b/opendc-format/src/test/kotlin/org/opendc/format/util/ParquetTest.kt
@@ -0,0 +1,125 @@
+/*
+ * 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.avro.SchemaBuilder
+import org.apache.avro.generic.GenericData
+import org.apache.parquet.avro.AvroParquetReader
+import org.apache.parquet.avro.AvroParquetWriter
+import org.apache.parquet.hadoop.ParquetFileWriter
+import org.junit.jupiter.api.*
+import org.junit.jupiter.api.Assertions.assertEquals
+import java.io.File
+import java.nio.file.FileAlreadyExistsException
+import java.nio.file.NoSuchFileException
+
+/**
+ * Test suite for the Parquet helper classes.
+ */
+internal class ParquetTest {
+    private val schema = SchemaBuilder
+        .record("test")
+        .namespace("org.opendc.format.util")
+        .fields()
+        .name("field").type().intType().noDefault()
+        .endRecord()
+
+    private lateinit var file: File
+
+    /**
+     * Setup the test
+     */
+    @BeforeEach
+    fun setUp() {
+        file = File.createTempFile("opendc", "parquet")
+    }
+
+    /**
+     * Tear down the test.
+     */
+    @AfterEach
+    fun tearDown() {
+        file.delete()
+    }
+
+    /**
+     * Initial test to verify whether the Parquet writer works.
+     */
+    @Test
+    fun testSmoke() {
+        val n = 4
+        val writer = AvroParquetWriter.builder<GenericData.Record>(LocalOutputFile(file))
+            .withSchema(schema)
+            .withWriteMode(ParquetFileWriter.Mode.OVERWRITE)
+            .build()
+
+        try {
+            repeat(n) { i ->
+                val record = GenericData.Record(schema)
+                record.put("field", i)
+                writer.write(record)
+            }
+        } finally {
+            writer.close()
+        }
+
+        val reader = AvroParquetReader.builder<GenericData.Record>(LocalInputFile(file))
+            .build()
+
+        var counter = 0
+        try {
+            while (true) {
+                val record = reader.read() ?: break
+                assertEquals(counter++, record.get("field"))
+            }
+        } finally {
+            reader.close()
+        }
+
+        assertEquals(n, counter)
+    }
+
+    /**
+     * Test if overwriting fails if not specified.
+     */
+    @Test
+    fun testOverwrite() {
+        assertThrows<FileAlreadyExistsException> {
+            AvroParquetWriter.builder<GenericData.Record>(LocalOutputFile(file))
+                .withSchema(schema)
+                .build()
+        }
+    }
+
+    /**
+     * Test non-existent file.
+     */
+    @Test
+    fun testNonExistent() {
+        file.delete()
+        assertThrows<NoSuchFileException> {
+            AvroParquetReader.builder<GenericData.Record>(LocalInputFile(file))
+                .build()
+        }
+    }
+}