update object dictionary API

Author: JavaSaBr

rlib-common/src/main/java/com/ss/rlib/common/util/dictionary/ObjectDictionary.java

@@ -8,10 +8,6 @@
 import org.jetbrains.annotations.Nullable;
 
 import java.util.Optional;
-import java.util.function.BiConsumer;
-import java.util.function.BiFunction;
-import java.util.function.Function;
-import java.util.function.Supplier;
 
 /**
  * The interface for implementing a key-value dictionary which using an object key.
@@ -101,6 +97,18 @@ default boolean containsKey(@NotNull K key) {
         throw new UnsupportedOperationException();
     }
 
+    /**
+     * Return the value to which the specified key is mapped, or default if this dictionary
+     * contains no mapping for the key.
+     *
+     * @param key the key whose associated value is to be returned.
+     * @return the value to which the specified key is mapped, or default if this dictionary contains no mapping for the key.
+     */
+    default @Nullable V getOrDefault(@NotNull K key, @NotNull V def) {
+        var value = get(key);
+        return value == null ? def : value;
+    }
+
     /**
      * Return the optional value to which the specified key is mapped, or {@code null} if this dictionary
      * contains no mapping for the key.

rlib-common/src/test/java/com/ss/rlib/common/test/util/dictionary/ObjectDictionaryTest.java

@@ -53,4 +53,14 @@ void dictionaryOfTest() {
             () -> ObjectDictionary.of("Key1")
         );
     }
+
+    @Test
+    void getOrDefaultTest() {
+
+        var dictionary = ObjectDictionary.<String, Integer>of("Key1", 1, "Key2", 2, "Key3", 3);
+
+        Assertions.assertEquals(1, dictionary.get("Key1"));
+        Assertions.assertNull(dictionary.get("Key10"));
+        Assertions.assertEquals(10, dictionary.getOrDefault("Key10", 10));
+    }
 }