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wpiunits/src/main/java/org/wpilib/units/AccelerationUnit.java

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+// 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 edu.wpi.first.units;
+
+import edu.wpi.first.units.measure.Acceleration;
+
+/**
+ * A generic unit of acceleration.
+ *
+ * <p><strong>NOTE:</strong> This type is not compatible with unit-specific accelerations like
+ * {@link edu.wpi.first.units.measure.LinearAcceleration}. Authors of APIs that need to interact
+ * with all types should consider using a generic {@code Measure<? extends PerUnit<? extends
+ * PerUnit<[dimension>], TimeUnit>, TimeUnit>}. Bounded wildcards are necessary in order to
+ * interoperate with <i>any</i> subclass of the {@link edu.wpi.first.units.measure.Per} measurement
+ * type.
+ *
+ * @param <D> the unit of the accelerating quantity
+ */
+public final class AccelerationUnit<D extends Unit> extends PerUnit<VelocityUnit<D>, TimeUnit> {
+  @SuppressWarnings({"rawtypes", "unchecked"})
+  private static final CombinatoryUnitCache<VelocityUnit, TimeUnit, AccelerationUnit> cache =
+      new CombinatoryUnitCache<>(AccelerationUnit::new);
+
+  AccelerationUnit(VelocityUnit<D> velocity, TimeUnit period) {
+    super(
+        velocity.isBaseUnit() && period.isBaseUnit()
+            ? null
+            : combine(velocity.getBaseUnit(), period.getBaseUnit()),
+        velocity,
+        period);
+  }
+
+  AccelerationUnit(
+      AccelerationUnit<D> baseUnit,
+      UnaryFunction toBaseConverter,
+      UnaryFunction fromBaseConverter,
+      String name,
+      String symbol) {
+    super(baseUnit, toBaseConverter, fromBaseConverter, name, symbol);
+  }
+
+  @Override
+  public Acceleration<D> of(double magnitude) {
+    return new Acceleration<>(magnitude, toBaseUnits(magnitude), this);
+  }
+
+  @Override
+  public Acceleration<D> ofBaseUnits(double baseUnitMagnitude) {
+    return new Acceleration<>(fromBaseUnits(baseUnitMagnitude), baseUnitMagnitude, this);
+  }
+
+  @Override
+  @SuppressWarnings({"unchecked", "rawtypes"})
+  public Acceleration<D> zero() {
+    return (Acceleration<D>) (Acceleration) super.zero();
+  }
+
+  @Override
+  @SuppressWarnings({"unchecked", "rawtypes"})
+  public Acceleration<D> one() {
+    return (Acceleration<D>) (Acceleration) super.one();
+  }
+
+  @Override
+  public VelocityUnit<AccelerationUnit<D>> per(TimeUnit time) {
+    return VelocityUnit.combine(this, time);
+  }
+
+  /**
+   * Creates a ratio unit between this unit and an arbitrary other unit.
+   *
+   * @param other the other unit
+   * @param <U> the type of the other unit
+   * @return the ratio unit
+   */
+  public <U extends Unit> PerUnit<AccelerationUnit<D>, U> per(U other) {
+    return PerUnit.combine(this, other);
+  }
+
+  /**
+   * Converts a measurement value in terms of another time unit to this unit.
+   *
+   * @param magnitude the magnitude of the measurement in terms of the other time unit
+   * @param otherUnit the other time unit
+   * @return the value of the measurement in terms of this unit
+   */
+  public double convertFrom(double magnitude, AccelerationUnit<D> otherUnit) {
+    return fromBaseUnits(otherUnit.toBaseUnits(magnitude));
+  }
+
+  /**
+   * Combines a generic velocity and time period into a unit of acceleration.
+   *
+   * @param velocity the unit of velocity
+   * @param period the unit of the time period of acceleration
+   * @param <D> the unit of the accelerating quantity
+   * @return the combined acceleration unit
+   */
+  @SuppressWarnings("unchecked")
+  public static <D extends Unit> AccelerationUnit<D> combine(
+      VelocityUnit<D> velocity, TimeUnit period) {
+    return cache.combine(velocity, period);
+  }
+}