Elytrium Java Serializer

Java Library to (de-)serialize data in various formats (e.g. JSON, YAML)

Features of Elytrium Java Serializer

• Zero dependencies
• Serialize any class without any modifications
• Auto replacer of placeholders
• Ability to add comments and new lines to the fields

Basic usage

Setup

Elytrium Java Serializer is uploaded to the Maven Central repository, so you can just add it as a dependency to your maven or gradle project.

• Maven (pom.xml):

  <dependencies>
    <dependency>
      <groupId>net.elytrium</groupId>
      <artifactId>serializer</artifactId>
      <version>1.1.1</version>
    </dependency>
  </dependencies>

• Gradle (build.gradle):

  dependencies {
    implementation("net.elytrium:serializer:1.1.1")
  }

Without any modifications

1. Create the class

   public class Settings {
   
     public String regularField = "regular value";
   }

2. Create YamlWriter

   Settings settings = new Settings();
   YamlWriter writer = new YamlWriter(Files.newBufferedWriter(Path.of("config.yml")));
   writer.writeNode(settings, null);

3. Create YamlReader

   Settings settings = new Settings();
   YamlReader reader = new YamlReader(Files.newBufferedReader(Path.of("config.yml")));
   reader.readSerializableObject(settings, Settings.class);

With some modifications

1. Create the class that extends YamlSerializable. You can optionally modify the config and call YamlSerializable#setConfig(SerializerConfig) method. You can safely remove super(Settings.CONFIG).

   public class Settings extends YamlSerializable {
   
     private static final SerializerConfig CONFIG = new SerializerConfig.Builder().build();
   
     Settings() {
       super(Settings.CONFIG);
     }
   
     public String regularField = "regular value";
   }

2. Instantiate it.

   Settings settings = new Settings();
   settings.reload(Path.of("config.yml"));

3. Done!

Pro usage

Comments and New lines

  @NewLine(amount = 3)
  @Comment(
      value = {
          @CommentValue(" SAME_LINE comment Line 1")
      },
      at = Comment.At.SAME_LINE
  )
  @Comment(
      value = {
          @CommentValue(" SAME_LINE APPEND second comment Line 1"),
          @CommentValue(type = CommentValue.Type.NEW_LINE),
          @CommentValue(" SAME_LINE APPEND second comment Line 2")
      },
      at = Comment.At.APPEND
  )
  public String regularField = "regular value";

Final and Transient fields

Final fields - unmodifiable fields that will be saved in the config.
Transient fields - unmodifiable fields that won't be saved in the config.

  public final String finalField = "final";
  @Final
  public String finalFieldToo = "final";

  public transient String transientField = "transient";
  @Transient
  public String transientFieldToo = "transient";

Placeholders

  @RegisterPlaceholders({"PLACEHOLDER", "another-placeholder"})
  public String anotherStringWithPlaceholders = "{PLACEHOLDER} {ANOTHER_PLACEHOLDER}";

  Assertions.assertEquals("value 1 value 2", Placeholders.replace(settings.anotherStringWithPlaceholders, "value 1", "value 2"));

Custom Placeholders

Custom placeholder will be instantiated once for one SerializableConfig.
Placeholders.replace will work even with custom placeholder.

  @RegisterPlaceholders(value = {"PLACEHOLDER", "another-placeholder"}, replacer = StringPlaceholderReplacer.class)
  public String anotherStringWithPlaceholders = "{PLACEHOLDER} {ANOTHER_PLACEHOLDER}";

  public class StringPlaceholderReplacer implements PlaceholderReplacer<String> {

    @Override
    public String replace(String value, String[] placeholders, Object... values) {
      for (int i = Math.min(values.length, placeholders.length) - 1; i >= 0; --i) {
        value = value.replace(placeholders[i], String.valueOf(values[i]));
      }
   
      return value;
    }
  }

Custom Serializers

Custom serializers will be instantiated once for one SerializableConfig.

  @Serializer(ExternalClassSerializer.class)
  public ExternalDeserializedClass testClass = new ExternalDeserializedClass();

  public static class ExternalDeserializedClass {

    public long x;
    public long y;
    public long z;
    public ExternalNestedClass nestedClass;

    // Public constructor with no args should be created for deserializer to work
    public ExternalDeserializedClass() {
      this.x = 0;
      this.y = 0;
      this.z = 0;
      this.nestedClass = new ExternalNestedClass("sample-name");
    }

    public ExternalDeserializedClass(long x, long y, long z, String name) {
      this.x = x;
      this.y = y;
      this.z = z;
      this.nestedClass = new ExternalNestedClass(name);
    }

    public static class ExternalNestedClass {

      private String name;

      // Public constructor with no args should be created for deserializer to work
      public ExternalNestedClass() {

      }

      public ExternalNestedClass(String name) {
        this.name = name;
      }
    }
  }

  public class ExternalClassSerializer extends ClassSerializer<ExternalDeserializedClass, Map<String, Object>> {

    @SuppressWarnings("unchecked")
    protected ExternalClassSerializer() {
      super(ExternalDeserializedClass.class, (Class<Map<String, Object>>) (Class<?>) Map.class);
    }

    @Override
    public Map<String, Object> serialize(ExternalDeserializedClass from) {
      return SerializerTest.map("field-x", from.x, "field-y", from.y, "field-z", from.z, "nested-class-name", from.nestedClass.name);
    }

    @Override
    public ExternalDeserializedClass deserialize(Map<String, Object> from) {
      return new ExternalDeserializedClass(
          (long) from.get("field-x"),
          (long) from.get("field-y"),
          (long) from.get("field-z"),
          (String) from.get("nested-class-name")
      );
    }
  }

Custom serializers without @Serializer annotation

In case if you can't add @Serializer annotation or if you have multiple entries with similar classes, you can register the serializer in the config.

  private static final SerializerConfig CONFIG = new SerializerConfig.Builder().registerSerializer(new PathSerializer()).registerSerializer(new ClassSerializer<>(String.class, String.class) {

    @Override
    public String serialize(String from) {
      return from == null ? "" : from;
    }
 
    @Override
    public String deserialize(String from) {
      return from.trim().isEmpty() ? null : from;
    }
  }).build();

Support

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Invite link: https://elytrium.net/discord