Implemented the new Units system

Fahrenheit has temporarily been removed; it will be back.

1 files changed, 89 insertions, 15 deletions

diff --git a/src/org/unitConverter/unit/UnitPrefix.java b/src/org/unitConverter/unit/UnitPrefix.java
index 9f9645d..514fa1c 100644
--- a/src/org/unitConverter/unit/UnitPrefix.java
+++ b/src/org/unitConverter/unit/UnitPrefix.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (C) 2018 Adrien Hopkins
+ * Copyright (C) 2019 Adrien Hopkins
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU Affero General Public License as published by
@@ -16,14 +16,57 @@
  */
 package org.unitConverter.unit;
 
+import org.unitConverter.math.DecimalComparison;
+
 /**
- * A prefix that can be attached onto the front of any unit, which multiplies it by a certain value
+ * A prefix that can be applied to a {@code LinearUnit} to multiply it by some value
  * 
  * @author Adrien Hopkins
- * @since 2019-01-14
- * @since v0.1.0
+ * @since 2019-10-16
  */
-public interface UnitPrefix {
+public final class UnitPrefix {
+	/**
+	 * Gets a {@code UnitPrefix} from a multiplier
+	 * 
+	 * @param multiplier
+	 *            multiplier of prefix
+	 * @return prefix
+	 * @since 2019-10-16
+	 */
+	public static UnitPrefix valueOf(final double multiplier) {
+		return new UnitPrefix(multiplier);
+	}
+
+	/**
+	 * The number that this prefix multiplies units by
+	 * 
+	 * @since 2019-10-16
+	 */
+	private final double multiplier;
+
+	/**
+	 * Creates the {@code DefaultUnitPrefix}.
+	 * 
+	 * @param multiplier
+	 * @since 2019-01-14
+	 * @since v0.2.0
+	 */
+	private UnitPrefix(final double multiplier) {
+		this.multiplier = multiplier;
+	}
+
+	/**
+	 * Divides this prefix by a scalar
+	 * 
+	 * @param divisor
+	 *            number to divide by
+	 * @return quotient of prefix and scalar
+	 * @since 2019-10-16
+	 */
+	public UnitPrefix dividedBy(final double divisor) {
+		return valueOf(this.getMultiplier() / divisor);
+	}
+
 	/**
 	 * Divides this prefix by {@code other}.
 	 * 
@@ -33,16 +76,42 @@ public interface UnitPrefix {
 	 * @since 2019-04-13
 	 * @since v0.2.0
 	 */
-	default UnitPrefix dividedBy(final UnitPrefix other) {
-		return new DefaultUnitPrefix(this.getMultiplier() / other.getMultiplier());
+	public UnitPrefix dividedBy(final UnitPrefix other) {
+		return valueOf(this.getMultiplier() / other.getMultiplier());
+	}
+
+	@Override
+	public boolean equals(final Object obj) {
+		if (this == obj)
+			return true;
+		if (obj == null)
+			return false;
+		if (!(obj instanceof UnitPrefix))
+			return false;
+		final UnitPrefix other = (UnitPrefix) obj;
+		return DecimalComparison.equals(this.getMultiplier(), other.getMultiplier());
+	}
+
+	public double getMultiplier() {
+		return this.multiplier;
+	}
+
+	@Override
+	public int hashCode() {
+		return DecimalComparison.hash(this.getMultiplier());
 	}
 
 	/**
-	 * @return this prefix's multiplier
-	 * @since 2019-01-14
-	 * @since v0.1.0
+	 * Multiplies this prefix by a scalar
+	 * 
+	 * @param multiplicand
+	 *            number to multiply by
+	 * @return product of prefix and scalar
+	 * @since 2019-10-16
 	 */
-	double getMultiplier();
+	public UnitPrefix times(final double multiplicand) {
+		return valueOf(this.getMultiplier() * multiplicand);
+	}
 
 	/**
 	 * Multiplies this prefix by {@code other}.
@@ -53,8 +122,8 @@ public interface UnitPrefix {
 	 * @since 2019-04-13
 	 * @since v0.2.0
 	 */
-	default UnitPrefix times(final UnitPrefix other) {
-		return new DefaultUnitPrefix(this.getMultiplier() * other.getMultiplier());
+	public UnitPrefix times(final UnitPrefix other) {
+		return valueOf(this.getMultiplier() * other.getMultiplier());
 	}
 
 	/**
@@ -66,7 +135,12 @@ public interface UnitPrefix {
 	 * @since 2019-04-13
 	 * @since v0.2.0
 	 */
-	default UnitPrefix toExponent(final double exponent) {
-		return new DefaultUnitPrefix(Math.pow(getMultiplier(), exponent));
+	public UnitPrefix toExponent(final double exponent) {
+		return valueOf(Math.pow(this.getMultiplier(), exponent));
+	}
+
+	@Override
+	public String toString() {
+		return String.format("Unit prefix equal to %s", this.multiplier);
 	}
 }