merge: Add generic trace reading library

This pull request adds a generic trace reading library to OpenDC. 
The library has been designed to support a wide range of trace formats 
and uses a streaming approach to improve performance of reading large traces.

* Add trace reading API
* Implement API for GWF format
* Implement API for SWF format
* Implement API for WTF format
* Implement API for Bitbrains format
* Implement API for Bitbrains Parquet format

**Breaking API Changes**

* `opendc-format` has been removed in favour of `opendc-trace-*`

1 files changed, 68 insertions, 0 deletions

diff --git a/opendc-trace/opendc-trace-api/src/main/kotlin/org/opendc/trace/TableColumn.kt b/opendc-trace/opendc-trace-api/src/main/kotlin/org/opendc/trace/TableColumn.kt
new file mode 100644
index 00000000..776c40c0
--- /dev/null
+++ b/opendc-trace/opendc-trace-api/src/main/kotlin/org/opendc/trace/TableColumn.kt
@@ -0,0 +1,68 @@
+/*
+ * 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
+
+import java.util.*
+
+/**
+ * A column in a trace table.
+ *
+ * @param name The universal name of this column.
+ */
+public class TableColumn<out T>(public val name: String, type: Class<T>) {
+    /**
+     * The type of the column.
+     */
+    private val type: Class<*> = type
+
+    /**
+     * Determine whether the type of the column is a subtype of [column].
+     */
+    public fun isAssignableTo(column: TableColumn<*>): Boolean {
+        return name == column.name && type.isAssignableFrom(column.type)
+    }
+
+    /**
+     * Compute a hash code for this column.
+     */
+    public override fun hashCode(): Int = Objects.hash(name, type)
+
+    /**
+     * Determine whether this column is equal to [other].
+     */
+    public override fun equals(other: Any?): Boolean {
+        // Fast-path: reference equality
+        if (this === other) {
+            return true
+        } else if (other == null || other !is TableColumn<*>) {
+            return false
+        }
+
+        return name == other.name && type == other.type
+    }
+
+    /**
+     * Return a string representation of this column.
+     */
+    public override fun toString(): String = "TableColumn[$name,$type]"
+}