refactor: NativePokemonComparator 생성

backend/pokerogue/src/main/java/com/pokerogue/helper/biome/data/NativePokemon.java

@@ -2,16 +2,16 @@
 
 import java.util.List;
 import lombok.AccessLevel;
+import lombok.AllArgsConstructor;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
 import org.springframework.data.mongodb.core.mapping.Field;
 
 @Getter
+@AllArgsConstructor
 @NoArgsConstructor(access = AccessLevel.PROTECTED)
 public class NativePokemon {
 
-    private static final String BOSS = "보스";
-
     @Field("tier")
     private Tier tier;
 
@@ -25,4 +25,8 @@ public boolean isWild() {
     public boolean isBoss() {
         return tier.isBoss();
     }
+
+    public int getRarity() {
+        return this.tier.getRarity();
+    }
 }

backend/pokerogue/src/main/java/com/pokerogue/helper/biome/data/Tier.java

@@ -8,21 +8,23 @@
 @Getter
 public enum Tier {
 
-    COMMON("보통"),
-    UNCOMMON("드묾"),
-    RARE("레어"),
-    SUPER_RARE("슈퍼 레어"),
-    ULTRA_RARE("울트라 레어"),
-    BOSS("보스"),
-    BOSS_RARE("레어 보스"),
-    BOSS_SUPER_RARE("슈퍼 레어 보스"),
-    BOSS_ULTRA_RARE("슈퍼 울트라 레어 보스"),
+    COMMON("보통", 1),
+    UNCOMMON("드묾", 2),
+    RARE("레어", 3),
+    SUPER_RARE("슈퍼 레어", 4),
+    ULTRA_RARE("울트라 레어", 5),
+    BOSS("보스", 6),
+    BOSS_RARE("레어 보스", 7),
+    BOSS_SUPER_RARE("슈퍼 레어 보스", 8),
+    BOSS_ULTRA_RARE("슈퍼 울트라 레어 보스", 9),
     ;
 
     private final String name;
+    private final int rarity;
 
-    Tier(String name) {
+    Tier(String name, int rarity) {
         this.name = name;
+        this.rarity = rarity;
     }
 
     public boolean isWild() {

backend/pokerogue/src/main/java/com/pokerogue/helper/biome/service/NativePokemonComparator.java

@@ -0,0 +1,34 @@
+package com.pokerogue.helper.biome.service;
+
+import com.pokerogue.helper.biome.data.NativePokemon;
+import java.util.Comparator;
+
+public class NativePokemonComparator implements Comparator<NativePokemon> {
+
+    public static final String ASCENDING = "asc";
+    public static final String DESCENDING = "desc";
+    private static final NativePokemonComparator ASCENDING_COMPARATOR = new NativePokemonComparator(ASCENDING);
+    private static final NativePokemonComparator DESCENDING_COMPARATOR = new NativePokemonComparator(DESCENDING);
+
+    private final String criteria;
+
+    private NativePokemonComparator(String criteria) {
+        this.criteria = criteria;
+    }
+
+    public static NativePokemonComparator of(String criteria) {
+        if (criteria.equals(ASCENDING)) {
+            return ASCENDING_COMPARATOR;
+        }
+        return DESCENDING_COMPARATOR;
+    }
+
+    @Override
+    public int compare(NativePokemon firstPokemon, NativePokemon secondPokemon) {
+        if (this.criteria.equals(ASCENDING)) {
+            return Integer.compare(firstPokemon.getRarity(), secondPokemon.getRarity());
+        }
+
+        return Integer.compare(secondPokemon.getRarity(), firstPokemon.getRarity());
+    }
+}

backend/pokerogue/src/test/java/com/pokerogue/helper/biome/service/NativePokemonComparatorTest.java

@@ -0,0 +1,41 @@
+package com.pokerogue.helper.biome.service;
+
+import static com.pokerogue.helper.biome.service.NativePokemonComparator.ASCENDING;
+import static com.pokerogue.helper.biome.service.NativePokemonComparator.DESCENDING;
+import static org.assertj.core.api.Assertions.assertThat;
+
+import com.pokerogue.helper.biome.data.NativePokemon;
+import com.pokerogue.helper.biome.data.Tier;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+class NativePokemonComparatorTest {
+
+    private final List<NativePokemon> nativePokemons = new ArrayList<>(List.of(
+            new NativePokemon(Tier.RARE, List.of("bulbasaur", "venusaur")),
+            new NativePokemon(Tier.COMMON, List.of("pikachu", "raichu")),
+            new NativePokemon(Tier.BOSS_RARE, List.of("charmander")),
+            new NativePokemon(Tier.BOSS_SUPER_RARE, List.of("roserade"))
+    ));
+
+    @Test
+    @DisplayName("바이옴 포켓몬을 티어의 희귀도가 낮은 순으로 정렬한다.")
+    void sortNativePokemonsAscending() {
+        Collections.sort(nativePokemons, NativePokemonComparator.of(ASCENDING));
+
+        assertThat(nativePokemons).extracting(NativePokemon::getTier)
+                .containsExactly(Tier.COMMON, Tier.RARE, Tier.BOSS_RARE, Tier.BOSS_SUPER_RARE);
+    }
+
+    @Test
+    @DisplayName("바이옴 포켓몬을 티어의 희귀도가 높은 순으로 정렬한다.")
+    void sortNativePokemonsDescending() {
+        Collections.sort(nativePokemons, NativePokemonComparator.of(DESCENDING));
+
+        assertThat(nativePokemons).extracting(NativePokemon::getTier)
+                .containsExactly(Tier.BOSS_SUPER_RARE, Tier.BOSS_RARE, Tier.RARE, Tier.COMMON);
+    }
+}