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Result javadocs

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Arne Keller 2021-03-10 16:20:25 +01:00
parent 4c0eb78300
commit 7396fc2158
1 changed files with 14 additions and 1 deletions
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15
src/main/java/edu/kit/typicalc/util/Result.java
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@ -71,13 +71,19 @@ public class Result<T, E> {
* @return the value
* @throws IllegalStateException if this is an error
*/
public T unwrap() {
public T unwrap() throws IllegalStateException {
if (value == null) {
throw new IllegalStateException("tried to unwrap a result, but error = " + error);
}
return value;
}
/**
* If the result contains a regular value, returns that value.
* Otherwise return the supplied alternative value.
*
* @return the value or the alternative
*/
public T unwrapOr(T alternative) {
if (value == null) {
return alternative;
@ -99,6 +105,13 @@ public class Result<T, E> {
return error;
}
/**
* Apply a function to the value of this result if it exists.
*
* @param mapping function to apply
* @param <U> new type of the value
* @return new result
*/
public <U> Result<U, E> map(Function<T, U> mapping) {
return new Result<>(value != null ? mapping.apply(value) : null, error);
}