This various annotations that can be used to customize configuration values within your mod, focusing on applying constraints, cosmetic properties, and advanced behaviors.

@Comment

Adds a description to a configurable value. This description will be visible on hover in GUIs or in the configuration file (if the file format supports comments).

Usage Example:

@Configurable
@Comment("This value controls whether vanilla mechanics are used.")
public boolean useVanillaMechanics = true;

@Synchronized

Synchronizes the value between client and server when a client joins the server. Note that the client’s config file is not rewritten, and the original values will be recovered upon leaving the server.

Usage Example:

@Configurable
@Synchronized
public boolean syncFeatureToggle = true;

@Range

Specifies a numeric range for integer or long values and their corresponding arrays.

Usage Example:

@Configurable
@Range(min = 0, max = 100)
public int maxPlayers = 20;

@DecimalRange

Specifies a numeric range for floating-point or double values, also applied to arrays of those types.

Usage Example:

@Configurable
@DecimalRange(min = 0.0, max = 1.0)
public double spawnRate = 0.5;

@StringPattern

Validates string values against a regular expression and optionally applies a default value for invalid inputs.

Usage Example:

@Configurable
@StringPattern(value = "^[a-zA-Z0-9_]+$", errorDescriptor = "String must be alphanumeric.")
public String username = "DefaultUser";

@FixedSize

Locks an array's size to its default value.

Usage Example:

@Configurable
@FixedSize
public int[] fixedArray = {1, 2, 3};

@ValueUpdateCallback

Links a configuration field to a custom method for validation or additional behaviors whenever the value changes.

Usage Example:

@Configurable
@ValueUpdateCallback(method = "onValueChange")
public int customRange = 10;

public void onValueChange(int value, IValidationHandler validationHandler) {
    if (value < 0) {
        validationHandler.invalidate("Value must be positive!");
    }
}

@Gui.NumberFormat

Specifies a custom number format for floats and doubles in the GUI.

Usage Example:

@Configurable
@Gui.NumberFormat("0.00")
public float roundedValue = 3.14f;

@Gui.ColorValue

Adds a color preview for string values in the GUI.

Usage Example:

@Configurable
@Gui.ColorValue(isARGB = true)
public String colorCode = "#FFFFFF";

@Gui.CharacterLimit

Sets a maximum character length for text fields in the configuration GUI.

Usage Example:

@Configurable
@Gui.CharacterLimit(16)
public String playerName = "DefaultName";