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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.commons.lang3.function;
import java.util.Objects;
import java.util.function.Consumer;
import java.util.function.Function;
/**
* A functional interface like {@link Consumer} that declares a {@link Throwable}.
*
* <p>
* This is a functional interface whose functional method is {@link #accept(Object)}.
* </p>
*
* @param <T> the type of the input to the operation
* @param <E> Thrown exception type.
* @since 3.11
*/
@FunctionalInterface
public interface FailableConsumer<T, E extends Throwable> {
/** NOP singleton */
@SuppressWarnings("rawtypes")
FailableConsumer NOP = Function.identity()::apply;
/**
* Returns The NOP singleton.
*
* @param <T> Consumed type 1.
* @param <E> The kind of thrown exception or error.
* @return The NOP singleton.
*/
static <T, E extends Throwable> FailableConsumer<T, E> nop() {
return NOP;
}
/**
* Accepts the consumer.
*
* @param object the parameter for the consumable to accept
* @throws E Thrown when the consumer fails.
*/
void accept(T object) throws E;
/**
* Returns a composed {@link Consumer} like {@link Consumer#andThen(Consumer)}.
*
* @param after the operation to perform after this operation
* @return a composed {@link Consumer} like {@link Consumer#andThen(Consumer)}.
* @throws NullPointerException when {@code after} is null
*/
default FailableConsumer<T, E> andThen(final FailableConsumer<? super T, E> after) {
Objects.requireNonNull(after);
return (final T t) -> {
accept(t);
after.accept(t);
};
}
}
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