Add JetBrains annotations; move versions to gradle.properties

build.gradle

@@ -14,7 +14,6 @@ group "net.fabricmc"
 archivesBaseName = "mapping-io"
 
 def ENV = System.getenv()
-version = "0.4.2"
 
 tasks.withType(JavaCompile).configureEach {
 	it.options.encoding = "UTF-8"
@@ -26,15 +25,16 @@ tasks.withType(JavaCompile).configureEach {
 
 checkstyle {
 	configFile = project.file("checkstyle.xml")
-	toolVersion = "8.31"
+	toolVersion = project.checkstyle_tool_version
 }
 
 repositories {
 	mavenCentral()
 }
 
 dependencies {
-	implementation "org.ow2.asm:asm:9.5"
+	implementation "org.ow2.asm:asm:${project.asm_version}"
+	implementation "org.jetbrains:annotations:${project.jetbrains_annotations_version}"
 }
 
 spotless {

gradle.properties

@@ -0,0 +1,10 @@
+# Gradle Properties
+org.gradle.jvmargs = -Xmx2G
+
+# Project properties
+version = 0.4.2
+
+# Dependencies
+asm_version = 9.5
+jetbrains_annotations_version = 24.0.1
+checkstyle_tool_version = 8.31

src/main/java/net/fabricmc/mappingio/format/ColumnFileReader.java

@@ -21,8 +21,11 @@
 import java.io.Reader;
 import java.util.Arrays;
 
+import org.jetbrains.annotations.ApiStatus;
+
 import net.fabricmc.mappingio.format.tiny.Tiny2Util;
 
+@ApiStatus.Internal
 public final class ColumnFileReader implements Closeable {
 	public ColumnFileReader(Reader reader, char columnSeparator) {
 		this.reader = reader;

src/main/java/net/fabricmc/mappingio/format/tiny/Tiny2Util.java

@@ -19,6 +19,9 @@
 import java.io.IOException;
 import java.io.Writer;
 
+import org.jetbrains.annotations.ApiStatus;
+
+@ApiStatus.Internal
 public final class Tiny2Util {
 	public static boolean needEscape(String s) {
 		for (int pos = 0, len = s.length(); pos < len; pos++) {