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/*
* MIT License
*
* Copyright (c) 2020 Roman Khlebnov
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package io.github.suppierk.java.util.function;
import io.github.suppierk.java.util.ExceptionSuppressor;
import java.util.function.Function;
/**
* Represents a function that accepts one argument and produces a result.
*
* Permits checked exceptions unlike {@link Function}
*
*
This is a functional interface whose functional method is
* {@link #apply(Object)}.
*
* @param the type of the input to the function
* @param the type of the result of the function
*/
@FunctionalInterface
@SuppressWarnings("squid:S112")
public interface ThrowableFunction extends Function {
/**
* Applies this function to the given argument.
*
* @param t the function argument
* @return the function result
* @throws Throwable occurred during processing
*/
R applyUnsafe(T t) throws Throwable;
/**
* Applies this function to the given argument.
*
* Has default implementation in order to make {@link #compose(Function)} and {@link
* #andThen(Function)} work.
*
* @param t the function argument
* @return the function result
*/
@Override
default R apply(T t) {
try {
return applyUnsafe(t);
} catch (Throwable throwable) {
return ExceptionSuppressor.asUnchecked(throwable);
}
}
/**
* Returns a function that always returns its input argument.
*
* @param the type of the input and output objects to the function
* @return a function that always returns its input argument
*/
static ThrowableFunction identity() {
return t -> t;
}
}