From 6d7d172e2e706da44c2b30177a04648671aad69e Mon Sep 17 00:00:00 2001
From: Adrien Hopkins <adrien.p.hopkins@gmail.com>
Date: Wed, 26 Aug 2020 12:37:12 -0500
Subject: Added the prefix repetition rule, and the two basic rules.

---
 .../converterGUI/DefaultPrefixRepetitionRule.java  | 42 ++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 src/org/unitConverter/converterGUI/DefaultPrefixRepetitionRule.java

(limited to 'src/org/unitConverter/converterGUI/DefaultPrefixRepetitionRule.java')

diff --git a/src/org/unitConverter/converterGUI/DefaultPrefixRepetitionRule.java b/src/org/unitConverter/converterGUI/DefaultPrefixRepetitionRule.java
new file mode 100644
index 0000000..34d8467
--- /dev/null
+++ b/src/org/unitConverter/converterGUI/DefaultPrefixRepetitionRule.java
@@ -0,0 +1,42 @@
+/**
+ * @since 2020-08-26
+ */
+package org.unitConverter.converterGUI;
+
+import java.util.List;
+import java.util.function.Predicate;
+
+import org.unitConverter.unit.UnitPrefix;
+
+/**
+ * A rule that specifies whether prefix repetition is allowed
+ *
+ * @since 2020-08-26
+ */
+enum DefaultPrefixRepetitionRule implements Predicate<List<UnitPrefix>> {
+	NO_REPETITION {
+		@Override
+		public boolean test(List<UnitPrefix> prefixes) {
+			return prefixes.size() <= 1;
+		}
+	},
+	NO_RESTRICTION {
+		@Override
+		public boolean test(List<UnitPrefix> prefixes) {
+			return true;
+		}
+	},
+	/**
+	 * You are allowed to have any number of Yotta/Yocto followed by possibly one
+	 * Kilo-Zetta/Milli-Zepto followed by possibly one Deca/Hecto. Same for
+	 * reducing prefixes, don't mix magnifying and reducing. Non-metric
+	 * (including binary) prefixes can't be repeated.
+	 */
+	COMPLEX_REPETITION {
+		@Override
+		public boolean test(List<UnitPrefix> prefixes) {
+			// TODO method stub
+			return false;
+		}
+	};
+}
-- 
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