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Additional functional components to Java 8.
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package io.gmi.junction;
import java.util.function.Function;
import java.util.function.Supplier;
/**
* Porting ideas from Scala to help avoid annoying try catches.
* http://www.scala-lang.org/files/archive/nightly/docs/library/index.html#scala.util.Try
* @param some type
*/
public abstract class Try {
public static Try success(T t) {
return new Success<>(t);
}
public static Try failure(Throwable t) {
return new Failure<>(t);
}
/**
* Completes this Try with an exception wrapped in a Success.
* @return Try with an exception wrapped in a Success.
*/
public abstract Try failed();
/**
* Returns the value from this Success or throws the exception if this is a Failure.
*
* Note that the exception will be a RuntimeException(Throwable)
* @return Success or throws the exception if this is a Failure.
*/
public abstract T get();
/**
* Returns true if the Try is a Failure, false otherwise.
* @return Returns true if the Try is a Failure, false otherwise.
*/
public abstract boolean isFailure();
/**
* Returns true if the Try is a Success, false otherwise.
* @return Returns true if the Try is a Success, false otherwise.
*/
public abstract boolean isSuccess();
/**
* Helpful for callers to use this when they want a case statement with Success and Failure
* @return TryState
*/
public abstract TryState state();
public T getOrElse(S s) {
return isSuccess() ? get() : s;
}
public T getOrElse(Supplier func) {
if(isSuccess()) {
return get();
} else {
try {
return func.get();
} catch (Throwable t) {
throw new RuntimeException(t);
}
}
}
/**
* Applies function on success and ignores if a failure.
* @param func the function to apply
* @param the arg
*/
public void forEach(Function func) {
if(isSuccess()) func.apply(get());
}
/**
* If success then returns a Success<S>. If a Failure, it returns this. Note that S should extend T or else ClassCastExceptions will be thrown.
*
* @param func
* @param
* @return
*/
public abstract Try map(Function func);
private static class Success extends Try {
private T t;
public Success(T t) {
this.t = t;
}
@Override
public Try failed() {
return new Failure<>(new UnsupportedOperationException("Success.failed"));
}
@Override
public T get() {
return t;
}
@Override
public boolean isFailure() {
return false;
}
@Override
public boolean isSuccess() {
return true;
}
@Override
public TryState state() {
return TryState.Success;
}
@Override
public Try map(Function func) {
try {
return new Success<>(func.apply(get()));
} catch (Error e) {
throw e;
} catch (Throwable t) {
return new Failure<>(t);
}
}
}
private static class Failure extends Try {
private Throwable t;
public Failure(Throwable t) {
this.t = t;
}
@Override
public Try failed() {
return new Success<>(t);
}
@Override
public T get() {
throw new RuntimeException(t);
}
@Override
public boolean isFailure() {
return true;
}
@Override
public boolean isSuccess() {
return false;
}
@Override
public TryState state() {
return TryState.Failure;
}
@Override
public Try map(Function func) {
return (Try) this;
}
}
}
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