buckelieg.fn.db.TryConsumer Maven / Gradle / Ivy
/*
* Copyright 2016- Anatoly Kutyakov
*
* 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 buckelieg.fn.db;
import static java.util.Objects.requireNonNull;
/**
* Represents an operation that accepts a single input argument and returns no
* result with an optional exception.
*
* @param the type of the input to the operation
* @param the type of the possible exception
*/
@SuppressWarnings("unchecked")
@FunctionalInterface
public interface TryConsumer {
/**
* Performs this operation on the given argument which might throw an exception.
*
* @param t the input argument
* @throws E an exception
*/
void accept(T t) throws E;
/**
* Returns reference of lambda expression.
*
* @param tryConsumer a consumer
* @return {@link TryConsumer} reference
* @throws NullPointerException if tryConsumer is null
*/
static TryConsumer of(TryConsumer tryConsumer) {
return requireNonNull(tryConsumer);
}
/**
* Returns a composed {@code TryConsumer} that performs, in sequence, this
* operation followed by the {@code after} operation. If performing either
* operation throws an exception, then corresponding exception is thrown.
* If performing this operation throws an exception,
* the {@code after} operation will not be performed.
*
* @param after the operation to perform after this operation
* @return a composed {@code TryConsumer} that performs in sequence this
* operation followed by the {@code after} operation
* @throws E an exception
* @throws NullPointerException if {@code after} is null
*/
default TryConsumer andThen(TryConsumer after) throws E {
try {
return (T t) -> {
accept(t);
requireNonNull(after).accept(t);
};
} catch (Throwable t) {
throw (E) t;
}
}
/**
* Returns a composed {@code TryConsumer} that performs, in sequence, this
* operation is preceded by the {@code before} operation. If performing either
* operation throws an exception, then corresponding exception is thrown.
* If performing this operation throws an exception,
* the {@code before} operation will not be performed.
*
* @param before the operation to perform before this operation
* @return a composed {@code TryConsumer} that performs in sequence this
* operation followed by the {@code before} operation
* @throws E an exception
* @throws NullPointerException if {@code before} is null
*/
default TryConsumer compose(TryConsumer before) throws E {
try {
return (T t) -> {
requireNonNull(before).accept(t);
accept(t);
};
} catch (Throwable t) {
throw (E) t;
}
}
}