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Member Access: @Shadow, @Accessor, @Final, @Mutable

Mixin accessors let you access invisible (private) or constant fields and methods.

Modifiers​

@Final​

Marks a variable as final. Used together with @Shadow.

@Mutable​

Used together with @Final or @Accessor to remove the original variable's final modifier, allowing the final variable to be modified.

Accessing fields​

First approach:​

@Shadow
private ServerNetworkIo networkIo;

Notes: 1. The name must match the original exactly. 2. Do not add final (remove it if present and add @Final instead, as in the example below:)

@Shadow
@Final
private MinecraftClient client;

Second approach:​

//interface registration
@Mixin(MinecraftClient.class)
public interface MinecraftClientAccessor {
    //getter
    @Accessor
    int getItemUseCooldown();
    //setter
    @Accessor("itemUseCooldown")
    void setItemUseCooldown(int itemUseCooldown);
}

//usage
//getter
int itemUseCooldown = ((MinecraftClientAccessor) MinecraftClient.getInstance()).getItemUseCooldown();
//setter
((MinecraftClientAccessor) MinecraftClient.getInstance()).setItemUseCooldown(100);

Notes: the name must match the original exactly.

Accessing methods:​

First approach:​

//registration
@Mixin(EndermanEntity.class)
public interface EndermanEntityInvoker {
  @Invoker("teleportTo")
  boolean invokeTeleportTo(double x, double y, double z);
}

//usage
EndermanEntity enderman = ...;
((EndermanEntityInvoker) enderman).invokeTeleportTo(0.0D, 70.0D, 0.0D);

Notes: the name must match the original exactly.

Second approach:​

@Shadow
protected abstract int getRenderedAmount(ItemStack stack);

Notes: 1. The name must match the original exactly. 2. It must be an abstract method, otherwise Java compilation fails.