diff options
Diffstat (limited to 'BJC-Utils2/src/main/java/bjc/utils/data/GenHolder.java')
| -rw-r--r-- | BJC-Utils2/src/main/java/bjc/utils/data/GenHolder.java | 113 |
1 files changed, 0 insertions, 113 deletions
diff --git a/BJC-Utils2/src/main/java/bjc/utils/data/GenHolder.java b/BJC-Utils2/src/main/java/bjc/utils/data/GenHolder.java deleted file mode 100644 index bd87f07..0000000 --- a/BJC-Utils2/src/main/java/bjc/utils/data/GenHolder.java +++ /dev/null @@ -1,113 +0,0 @@ -package bjc.utils.data; - -import java.util.function.Consumer; -import java.util.function.Function; - -/** - * Holds a single value of a specific type. This is used for indirect - * references to data, and more specifically for accessing non-final - * variables from a lambda. AKA the identity monad - * - * This is an eager variant of {@link IHolder} - * - * @author ben - * - * @param <T> - * The type of the data being held - */ -public class GenHolder<T> implements IHolder<T> { - /** - * The state this holder is responsible for. - */ - private T heldValue; - - /** - * Creates a new empty holder, with its state set to null - */ - public GenHolder() { - heldValue = null; - } - - /** - * Creates a new holder, with its state initialized to the provided - * value - * - * @param held - * The state to initialize this holder to. - */ - public GenHolder(T held) { - heldValue = held; - } - - /* - * (non-Javadoc) - * - * @see bjc.utils.data.IHolder#doWith(java.util.function.Consumer) - */ - @Override - public void doWith(Consumer<T> action) { - if (action == null) { - throw new NullPointerException("Action must be non-null"); - } - - action.accept(heldValue); - } - - /* - * (non-Javadoc) - * - * @see bjc.utils.data.IHolder#map(java.util.function.Function) - */ - @Override - public <NewT> IHolder<NewT> map(Function<T, NewT> transformer) { - if (transformer == null) { - throw new NullPointerException("Transformer must be non-null"); - } - - return new GenHolder<>(transformer.apply(heldValue)); - } - - /* - * (non-Javadoc) - * - * @see bjc.utils.data.IHolder#transform(java.util.function.Function) - */ - @Override - public IHolder<T> transform(Function<T, T> transformer) { - if (transformer == null) { - throw new NullPointerException("Transformer must be non-null"); - } - - heldValue = transformer.apply(heldValue); - - return this; - } - - /* - * (non-Javadoc) - * - * @see bjc.utils.data.IHolder#unwrap(java.util.function.Function) - */ - @Override - public <E> E unwrap(Function<T, E> unwrapper) { - if (unwrapper == null) { - throw new NullPointerException("Unwrapper must be null"); - } - - return unwrapper.apply(heldValue); - } - - @Override - public String toString() { - if (heldValue == null) { - return "(null)"; - } - - return heldValue.toString(); - } - - @Override - public <E> IHolder<E> bind(Function<T, IHolder<E>> binder) { - return binder.apply(heldValue); - } -} |
