AttributeKey Class — netty Architecture

Source Code

common/src/main/java/io/netty/util/AttributeKey.java lines 24–66

@SuppressWarnings("UnusedDeclaration") // 'T' is used only at compile time
public final class AttributeKey<T> extends AbstractConstant<AttributeKey<T>> {

    private static final ConstantPool<AttributeKey<Object>> pool = new ConstantPool<AttributeKey<Object>>() {
        @Override
        protected AttributeKey<Object> newConstant(int id, String name) {
            return new AttributeKey<Object>(id, name);
        }
    };

    /**
     * Returns the singleton instance of the {@link AttributeKey} which has the specified {@code name}.
     */
    @SuppressWarnings("unchecked")
    public static <T> AttributeKey<T> valueOf(String name) {
        return (AttributeKey<T>) pool.valueOf(name);
    }

    /**
     * Returns {@code true} if a {@link AttributeKey} exists for the given {@code name}.
     */
    public static boolean exists(String name) {
        return pool.exists(name);
    }

    /**
     * Creates a new {@link AttributeKey} for the given {@code name} or fail with an
     * {@link IllegalArgumentException} if a {@link AttributeKey} for the given {@code name} exists.
     */
    @SuppressWarnings("unchecked")
    public static <T> AttributeKey<T> newInstance(String name) {
        return (AttributeKey<T>) pool.newInstance(name);
    }

    @SuppressWarnings("unchecked")
    public static <T> AttributeKey<T> valueOf(Class<?> firstNameComponent, String secondNameComponent) {
        return (AttributeKey<T>) pool.valueOf(firstNameComponent, secondNameComponent);
    }

    private AttributeKey(int id, String name) {
        super(id, name);
    }
}