implement toString to serialize to JSON format, add "id" field for SongUnit

build.gradle

@@ -19,6 +19,8 @@ dependencies {
 	testImplementation "org.junit.jupiter:junit-jupiter-api:${lib_junit_v}"
 	testRuntimeOnly "org.junit.jupiter:junit-jupiter-engine:${lib_junit_v}"
 	
+	testImplementation project(":sekai-scores-db")
+	
 }
 
 final JavaVersion proj_java = JavaVersion.VERSION_17

gradle.properties

@@ -1,7 +1,7 @@
 ## Project Configurations
 
 # Proj Metadata
-projVersion = 0.2
+projVersion = 0.3
 
 
 # Dependencies

sekai-scores-db/build.gradle

@@ -1,11 +1,11 @@
+import java.nio.charset.Charset
+import java.nio.charset.StandardCharsets
+
 plugins {
 	id 'java'
 	id 'java-library'
 }
 
-group 'cc.sukazyo'
-version moduleVersion
-
 repositories {
 	mavenCentral()
 }
@@ -19,6 +19,31 @@ dependencies {
 	
 }
 
+final JavaVersion proj_java = JavaVersion.VERSION_17
+final Charset proj_source_encoding = StandardCharsets.UTF_8
+
+group 'cc.sukazyo'
+version moduleVersion
+
 test {
 	useJUnitPlatform()
 }
+
+java {
+	
+	sourceCompatibility proj_java
+	targetCompatibility proj_java
+	
+	withSourcesJar()
+	
+}
+
+tasks.withType(JavaCompile) {
+	options.encoding = proj_source_encoding.name()
+}
+
+tasks.withType(Javadoc) {
+	options.encoding = proj_source_encoding.name()
+	options.docEncoding = proj_source_encoding.name()
+	options.charSet = proj_source_encoding.name()
+}

src/main/java/cc/sukazyo/sekai_scores/DifficultiesSekai.java

@@ -26,4 +26,17 @@ public record DifficultiesSekai(
 		action.accept(MASTER_NAME, master);
 	}
 	
+	@Override
+	@Nonnull
+	public String toString() {
+		return String.format(
+				"[{\"id\":\"%s\",%s},{\"id\":\"%s\",%s},{\"id\":\"%s\",%s},{\"id\":\"%s\",%s},{\"id\":\"%s\",%s}]",
+				EASY_NAME, easy.toStringSimple(),
+				NORMAL_NAME, normal.toStringSimple(),
+				HARD_NAME, hard.toStringSimple(),
+				EXPERT_NAME, expert.toStringSimple(),
+				MASTER_NAME, master.toStringSimple()
+		);
+	}
+	
 }

src/main/java/cc/sukazyo/sekai_scores/Difficulty.java

@@ -1,8 +1,45 @@
 package cc.sukazyo.sekai_scores;
 
 import javax.annotation.Nonnegative;
+import javax.annotation.Nonnull;
 
 public record Difficulty(
 		@Nonnegative int level,
 		@Nonnegative int noteCount
-) {}
+) {
+	
+	/**
+	 * The difficulty number of this difficulty map.
+	 * <p>
+	 * it is a number in range 1-36 in official prsk game.
+	 * @since 0.2
+	 */
+	@Nonnegative public int level () { return level; }
+	/**
+	 * an alias of {@link #level} field.
+	 * @since 0.3
+	 * @see #level()
+	 */
+	@Nonnegative public int difficulty () { return level(); }
+	
+	/**
+	 * The total note count in this difficulty map.
+	 * @since 0.2
+	 */
+	@Nonnegative public int noteCount () { return noteCount; }
+	
+	@Override
+	@Nonnull
+	public String toString() {
+		return String.format("{%s}", toStringSimple());
+	}
+	
+	@Nonnull
+	public String toStringSimple () {
+		return String.format(
+				"\"difficulty\":%d,\"notes\":%d",
+				level, noteCount
+		);
+	}
+	
+}

src/main/java/cc/sukazyo/sekai_scores/ScoreBaseData.java

@@ -2,6 +2,7 @@ package cc.sukazyo.sekai_scores;
 
 import javax.annotation.CheckForSigned;
 import javax.annotation.Nonnegative;
+import javax.annotation.Nonnull;
 
 /**
  * @see ScoreBase
@@ -182,4 +183,17 @@ public class ScoreBaseData {
 		return combo;
 	}
 	
+	@Override
+	@Nonnull
+	public String toString() {
+		return String.format(
+				"{\"perfect\":%d,\"great\":%d,\"good\":%d,\"bad\":%d,\"miss\":%d,\"judge\":{\"fast\":%s,\"slow\":%s,\"flick\":%s},\"combo\":%s}",
+				notePerfect, noteGreat, noteGood, noteBad, noteMiss,
+				judgeFast==NULL ? "null" : judgeFast,
+				judgeSlow==NULL ? "null" : judgeFast,
+				judgeFlick==NULL ? "null" : judgeFast,
+				combo==NULL ? "null" : combo
+		);
+	}
+	
 }

src/main/java/cc/sukazyo/sekai_scores/Song.java

@@ -1,9 +1,24 @@
 package cc.sukazyo.sekai_scores;
 
+import cc.sukazyo.sekai_scores.util.Converter;
+
 import javax.annotation.Nonnull;
 
 public record Song(
 		@Nonnull String name,
 		@Nonnull SongUnit unit,
 		@Nonnull Difficulties difficulties
-) {}
+) {
+	
+	@Override
+	@Nonnull
+	public String toString () {
+		return String.format(
+				"{\"name\":\"%s\",\"unit\":%s,\"difficulties\":%s}",
+				Converter.parseJSONString(name),
+				unit,
+				difficulties
+		);
+	}
+	
+}

src/main/java/cc/sukazyo/sekai_scores/SongUnit.java

@@ -1,23 +1,64 @@
 package cc.sukazyo.sekai_scores;
 
+import cc.sukazyo.sekai_scores.util.Converter;
+
 import javax.annotation.Nonnull;
 
 public enum SongUnit {
 	
-	VSINGER("VIRTUAL SINGER"),
-	LEO_NEED("Leo/need"),
-	MORE_MORE_JUMP("MORE MORE JUMP!"),
-	VIVID_BAD_SQUAD("Vivid BAD SQUAD"),
-	WONDERLANDS_SHOWTIME("ワンダーランズ×ショウタイム"),
-	NIGHTCORD_25JI("25時、ナイトコードで。"),
-	OTHER("other"),
-	SP("セカイ")
+	VSINGER(0, "VIRTUAL SINGER"),
+	LEO_NEED(1, "Leo/need"),
+	MORE_MORE_JUMP(2, "MORE MORE JUMP!"),
+	VIVID_BAD_SQUAD(3, "Vivid BAD SQUAD"),
+	WONDERLANDS_SHOWTIME(4, "ワンダーランズ×ショウタイム"),
+	NIGHTCORD_25JI(5, "25時、ナイトコードで。"),
+	/**
+	 * Just the "other" unit in game.
+	 * @since 0.2
+	 */
+	OTHER(-1, "other"),
+	/**
+	 * It collects that songs belongs to multiple units.
+	 * <p>
+	 * Like "Journey", "群青讃歌", it belongs to all of those units exists in game,
+	 * and hard to assign those songs to those units exists. So this group was created,
+	 * means the song belongs to "the whole セカイ".
+	 * <p>
+	 * This unit/group doesn't exist in the game.
+	 * @since 0.2
+	 */
+	SP(-2, "セカイ")
 	;
 	
+	/**
+	 * An id of this group/unit.
+	 * <p>
+	 * The value start at 0 for {@link #VSINGER}
+	 * and increment according to the order of the groups/units in the game.
+	 * <p>
+	 * for some special group/unit, it has a special id:
+	 * <ul>
+	 *     <li>{@link #OTHER}: {@link -1}, as a special group that even exists in game</li>
+	 *     <li>{@link #SP}: {@link -2}, as a group that doesn't exist in game</li>
+	 * </ul>
+	 * @since 0.3
+	 */
+	public final int id;
 	@Nonnull public final String name;
 	
-	SongUnit (@Nonnull String name) {
+	SongUnit (int id, @Nonnull String name) {
+		this.id = id;
 		this.name = name;
 	}
 	
+	@Override
+	@Nonnull
+	public String toString() {
+		return String.format(
+				"{\"id\":%d,\"fullname\":\"%s\"}",
+				id,
+				Converter.parseJSONString(name)
+		);
+	}
+	
 }

src/main/java/cc/sukazyo/sekai_scores/UserScore.java

@@ -1,11 +1,23 @@
 package cc.sukazyo.sekai_scores;
 
 import javax.annotation.Nonnull;
-import java.time.LocalDateTime;
+import java.time.ZonedDateTime;
 
 public record UserScore (
 		@Nonnull Song song,
 		@Nonnull Difficulty difficulty,
 		@Nonnull ScoreBase score,
-		@Nonnull LocalDateTime playtime
-) {}
+		@Nonnull ZonedDateTime playtime
+) {
+	
+	@Override
+	@Nonnull
+	public String toString () {
+		return String.format(
+				"{\"song\":%s,\"difficulty\":%s,\"score\":%s,\"playtime\":%d}",
+				song, difficulty, score,
+				playtime.toInstant().toEpochMilli()
+		);
+	}
+	
+}

src/main/java/cc/sukazyo/sekai_scores/util/Converter.java

@@ -0,0 +1,12 @@
+package cc.sukazyo.sekai_scores.util;
+
+import javax.annotation.Nonnull;
+
+public class Converter {
+	
+	@Nonnull
+	public static String parseJSONString (@Nonnull String input) {
+		return input.replaceAll("'", "\\'").replaceAll("\"", "\\\"");
+	}
+	
+}