diff options
| author | Benjamin J. Culkin <bjculkin@mix.wvu.edu> | 2017-10-08 22:39:59 -0300 |
|---|---|---|
| committer | Benjamin J. Culkin <bjculkin@mix.wvu.edu> | 2017-10-08 22:39:59 -0300 |
| commit | c82e3b3b2de0633317ec8fc85925e91422820597 (patch) | |
| tree | 96567416ce23c5ce85601f9cedc3a94bb1c55cba /BJC-Utils2/src/main/java/bjc/utils/data/Option.java | |
| parent | b3ac1c8690c3e14c879913e5dcc03a5f5e14876e (diff) | |
Start splitting into maven modules
Diffstat (limited to 'BJC-Utils2/src/main/java/bjc/utils/data/Option.java')
| -rw-r--r-- | BJC-Utils2/src/main/java/bjc/utils/data/Option.java | 93 |
1 files changed, 0 insertions, 93 deletions
diff --git a/BJC-Utils2/src/main/java/bjc/utils/data/Option.java b/BJC-Utils2/src/main/java/bjc/utils/data/Option.java deleted file mode 100644 index 37e0cde..0000000 --- a/BJC-Utils2/src/main/java/bjc/utils/data/Option.java +++ /dev/null @@ -1,93 +0,0 @@ -package bjc.utils.data; - -import java.util.function.Function; -import java.util.function.UnaryOperator; - -/** - * A holder that may or may not contain a value - * - * @author ben - * - * @param <ContainedType> - * The type of the value that may or may not be held - */ -public class Option<ContainedType> implements IHolder<ContainedType> { - private ContainedType held; - - /** - * Create a new optional, using the given initial value - * - * @param seed - * The initial value for the optional - */ - public Option(final ContainedType seed) { - held = seed; - } - - @Override - public <BoundType> IHolder<BoundType> bind(final Function<ContainedType, IHolder<BoundType>> binder) { - if (held == null) return new Option<>(null); - - return binder.apply(held); - } - - @Override - public <NewType> Function<ContainedType, IHolder<NewType>> lift(final Function<ContainedType, NewType> func) { - return val -> { - return new Option<>(func.apply(val)); - }; - } - - @Override - public <MappedType> IHolder<MappedType> map(final Function<ContainedType, MappedType> mapper) { - if (held == null) return new Option<>(null); - - return new Option<>(mapper.apply(held)); - } - - @Override - public IHolder<ContainedType> transform(final UnaryOperator<ContainedType> transformer) { - if (held != null) { - held = transformer.apply(held); - } - - return this; - } - - @Override - public <UnwrappedType> UnwrappedType unwrap(final Function<ContainedType, UnwrappedType> unwrapper) { - if (held == null) return null; - - return unwrapper.apply(held); - } - - @Override - public String toString() { - return String.format("Option [held='%s']", held); - } - - @Override - public int hashCode() { - final int prime = 31; - - int result = 1; - result = prime * result + (held == null ? 0 : held.hashCode()); - - return result; - } - - @Override - public boolean equals(final Object obj) { - if (this == obj) return true; - if (obj == null) return false; - if (!(obj instanceof Option<?>)) return false; - - final Option<?> other = (Option<?>) obj; - - if (held == null) { - if (other.held != null) return false; - } else if (!held.equals(other.held)) return false; - - return true; - } -} |
