From a254352abed2dc5a9ae803fee26cfca1ba3a586b Mon Sep 17 00:00:00 2001
From: Ken Partlow <kpartlow@gmail.com>
Date: Tue, 9 Jan 2024 00:35:50 -0500
Subject: [PATCH] Pulled over conventiosn

---
 .../com/cedarsoftware/util/Convention.java    | 69 +++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100644 src/main/java/com/cedarsoftware/util/Convention.java

diff --git a/src/main/java/com/cedarsoftware/util/Convention.java b/src/main/java/com/cedarsoftware/util/Convention.java
new file mode 100644
index 00000000..111211de
--- /dev/null
+++ b/src/main/java/com/cedarsoftware/util/Convention.java
@@ -0,0 +1,69 @@
+package com.cedarsoftware.util;
+
+import java.util.Map;
+
+public class Convention {
+
+    /**
+     * statically accessed class
+     */
+    private Convention() {
+    }
+
+    /**
+     * Throws an exception if null
+     *
+     * @param value   object to check if null
+     * @param message message to use when thrown
+     * @throws IllegalArgumentException if the string passed in is null or empty
+     */
+    public static void throwIfNull(Object value, String message) {
+        if (value == null) {
+            throw new IllegalArgumentException(message);
+        }
+    }
+
+    /**
+     * Throws an exception if null or empty
+     *
+     * @param value   string to check
+     * @param message message to use when thrown
+     * @throws IllegalArgumentException if the string passed in is null or empty
+     */
+    public static void throwIfNullOrEmpty(String value, String message) {
+        if (value == null || value.isEmpty()) {
+            throw new IllegalArgumentException(message);
+        }
+    }
+
+    public static void throwIfClassNotFound(String fullyQualifiedClassName, ClassLoader loader) {
+        throwIfNullOrEmpty(fullyQualifiedClassName, "fully qualified ClassName cannot be null or empty");
+        throwIfNull(loader, "loader cannot be null");
+
+        Class<?> c = ClassUtilities.forName(fullyQualifiedClassName, loader);
+        if (c == null) {
+            throw new IllegalArgumentException("Unknown class: " + fullyQualifiedClassName + " was not found.");
+        }
+    }
+
+    public static <K, V> void throwIfKeyExists(Map<K, V> map, K key, String message) {
+        throwIfNull(map, "map cannot be null");
+        throwIfNull(key, "key cannot be null");
+
+        if (map.containsKey(key)) {
+            throw new IllegalArgumentException(message);
+        }
+    }
+
+    /**
+     * Throws an exception if the logic is false.
+     *
+     * @param logic   test to see if we need to throw the exception.
+     * @param message to include in the exception explaining why the the assertion failed
+     */
+    public static void throwIfFalse(boolean logic, String message) {
+        if (!logic) {
+            throw new IllegalArgumentException(message);
+        }
+    }
+}