/**
 * Copyright (C) Posten Norge AS
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package no.digipost.function;

import no.digipost.exceptions.Exceptions;

import java.util.function.Function;

@FunctionalInterface
public interface ThrowingFunction<T, R, X extends Throwable> {
	R apply(T t) throws X;

	default Function<T, R> asUnchecked() {
	    return t -> {
	        try {
                return ThrowingFunction.this.apply(t);
	        } catch (RuntimeException | Error e) {
	            throw e;
            } catch (Throwable e) {
                throw Exceptions.asUnchecked(e);
            }
	    };
	}
}

/**
 * Copyright (C) Posten Norge AS
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package no.digipost.function;

import no.digipost.exceptions.Exceptions;

import java.util.Optional;
import java.util.function.BiConsumer;
import java.util.function.Function;

@FunctionalInterface
public interface ThrowingFunction<T, R, X extends Throwable> {
	R apply(T t) throws X;

	default Function<T, R> asUnchecked() {
	    return t -> {
	        try {
                return ThrowingFunction.this.apply(t);
	        } catch (RuntimeException | Error e) {
	            throw e;
            } catch (Throwable e) {
                throw Exceptions.asUnchecked(e);
            }
	    };
	}

	default Function<T, Optional<R>> ifException(BiConsumer<? super T, Exception> exceptionHandler) {
        return t -> {
            try {
                return Optional.of(ThrowingFunction.this.apply(t));
            } catch (Exception e) {
                exceptionHandler.accept(t, e);
                return Optional.empty();
            } catch (Error err) {
                throw err;
            } catch (Throwable thr) {
                throw Exceptions.asUnchecked(thr);
            }
        };
    }
}

Convert ThrowingFunction to Function<T, Optional<R>>