[hal,wpilib] Move Alert to HAL (#8646)

SystemCore implementation is not yet connected to MRCComm.

wpilibj/src/main/java/org/wpilib/simulation/AlertSim.java

@@ -0,0 +1,91 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+package org.wpilib.simulation;
+
+import org.wpilib.driverstation.Alert.Level;
+import org.wpilib.hardware.hal.AlertJNI;
+import org.wpilib.hardware.hal.simulation.AlertDataJNI;
+
+/** Simulation for alerts. */
+public final class AlertSim {
+  private AlertSim() {
+    throw new UnsupportedOperationException("This is a utility class!");
+  }
+
+  /** Information about an alert. */
+  public static class AlertInfo {
+    AlertInfo(AlertDataJNI.AlertInfo info) {
+      this.handle = info.handle;
+      this.group = info.group;
+      this.text = info.text;
+      this.activeStartTime = info.activeStartTime;
+      this.level =
+          switch (info.level) {
+            case AlertJNI.LEVEL_HIGH -> Level.HIGH;
+            case AlertJNI.LEVEL_MEDIUM -> Level.MEDIUM;
+            case AlertJNI.LEVEL_LOW -> Level.LOW;
+            default -> throw new IllegalArgumentException("Unknown alert level: " + info.level);
+          };
+    }
+
+    /** The handle of the alert. */
+    @SuppressWarnings("MemberName")
+    public final int handle;
+
+    /** The group of the alert. */
+    @SuppressWarnings("MemberName")
+    public final String group;
+
+    /** The text of the alert. */
+    @SuppressWarnings("MemberName")
+    public final String text;
+
+    /** The time the alert became active. 0 if not active. */
+    @SuppressWarnings("MemberName")
+    public final long activeStartTime;
+
+    /** The level of the alert (HIGH, MEDIUM, or LOW). */
+    @SuppressWarnings("MemberName")
+    public final Level level;
+
+    /**
+     * Returns whether the alert is currently active.
+     *
+     * @return true if the alert is active, false otherwise
+     */
+    public boolean isActive() {
+      return activeStartTime != 0;
+    }
+  }
+
+  /**
+   * Gets the number of alerts. Note: this is not guaranteed to be consistent with the number of
+   * alerts returned by GetAll.
+   *
+   * @return the number of alerts
+   */
+  public static int getCount() {
+    return AlertDataJNI.getNumAlerts();
+  }
+
+  /**
+   * Gets detailed information about each alert.
+   *
+   * @return Alerts
+   */
+  public static AlertInfo[] getAll() {
+    AlertDataJNI.AlertInfo[] alertInfos = AlertDataJNI.getAlerts();
+    AlertInfo[] infos = new AlertInfo[alertInfos.length];
+    for (int i = 0; i < alertInfos.length; i++) {
+      infos[i] = new AlertInfo(alertInfos[i]);
+    }
+    return infos;
+  }
+
+  /** Resets all alert simulation data. */
+  public static void resetData() {
+    AlertDataJNI.resetData();
+  }
+}