feat(kotlin): define cache operator overloads (#54)

Author: iProdigy

kotlin/src/main/kotlin/io/github/xanthic/cache/ktx/CacheApiExtensions.kt

@@ -8,3 +8,27 @@ import io.github.xanthic.cache.core.CacheApiSpec
  * @see CacheApi.create
  */
 fun <K, V> createCache(init: CacheApiSpec<K, V>.() -> Unit): Cache<K, V> = CacheApi.create(init)
+
+/**
+ * @see Cache.get
+ */
+operator fun <K : Any, V : Any> Cache<K, V>.contains(key: K): Boolean = this.get(key) != null
+
+/**
+ * @see Cache.remove
+ */
+operator fun <K : Any, V : Any> Cache<K, V>.minusAssign(key: K) {
+    this.remove(key)
+}
+
+/**
+ * @see Cache.putAll
+ */
+operator fun <K : Any, V : Any> Cache<K, V>.plusAssign(map: Map<K, V>) {
+    this.putAll(map)
+}
+
+/**
+ * @see Cache.put
+ */
+operator fun <K : Any, V : Any> Cache<K, V>.set(key: K, value: V): V? = this.put(key, value)

kotlin/src/test/kotlin/io/github/xanthic/cache/ktx/KotlinTest.kt

@@ -3,7 +3,9 @@ package io.github.xanthic.cache.ktx
 import io.github.xanthic.cache.api.domain.ExpiryType
 import java.time.Duration
 import kotlin.test.Test
+import kotlin.test.assertEquals
 import kotlin.test.assertNotNull
+import kotlin.test.assertTrue
 
 internal class KotlinTest {
 
@@ -22,6 +24,16 @@ internal class KotlinTest {
         }
 
         assertNotNull(cache)
+
+        cache["420"] = 420
+        assertEquals(420, cache["420"])
+
+        cache -= "420"
+        assertTrue("420" !in cache)
+
+        cache += mapOf("1" to 1, "2" to 2)
+        assertTrue("1" in cache)
+        assertTrue("2" in cache)
     }
 
 }