Add Roadrunner

TeamCode/util/LoggingUtil.java

@@ -0,0 +1,60 @@
+package org.firstinspires.ftc.teamcode.util;
+
+import org.firstinspires.ftc.robotcore.internal.system.AppUtil;
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+/**
+ * Utility functions for log files.
+ */
+public class LoggingUtil {
+    public static final File ROAD_RUNNER_FOLDER =
+            new File(AppUtil.ROOT_FOLDER + "/RoadRunner/");
+
+    private static final long LOG_QUOTA = 25 * 1024 * 1024; // 25MB log quota for now
+
+    private static void buildLogList(List<File> logFiles, File dir) {
+        for (File file : dir.listFiles()) {
+            if (file.isDirectory()) {
+                buildLogList(logFiles, file);
+            } else {
+                logFiles.add(file);
+            }
+        }
+    }
+
+    private static void pruneLogsIfNecessary() {
+        List<File> logFiles = new ArrayList<>();
+        buildLogList(logFiles, ROAD_RUNNER_FOLDER);
+        Collections.sort(logFiles, (lhs, rhs) ->
+                Long.compare(lhs.lastModified(), rhs.lastModified()));
+
+        long dirSize = 0;
+        for (File file: logFiles) {
+            dirSize += file.length();
+        }
+
+        while (dirSize > LOG_QUOTA) {
+            if (logFiles.size() == 0) break;
+            File fileToRemove = logFiles.remove(0);
+            dirSize -= fileToRemove.length();
+            //noinspection ResultOfMethodCallIgnored
+            fileToRemove.delete();
+        }
+    }
+
+    /**
+     * Obtain a log file with the provided name
+     */
+    public static File getLogFile(String name) {
+        //noinspection ResultOfMethodCallIgnored
+        ROAD_RUNNER_FOLDER.mkdirs();
+
+        pruneLogsIfNecessary();
+
+        return new File(ROAD_RUNNER_FOLDER, name);
+    }
+}