| /* |
| * 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.io.function; |
| |
| import java.io.IOException; |
| import java.io.UncheckedIOException; |
| import java.util.Objects; |
| import java.util.Spliterator; |
| import java.util.function.Consumer; |
| |
| /** |
| * Like {@link Spliterator} but throws {@link IOException}. |
| * |
| * @param <T> the type of elements returned by this IOSpliterator. |
| * @since 2.12.0 |
| */ |
| public interface IOSpliterator<T> { |
| |
| /** |
| * Adapts the given Spliterator as an IOSpliterator. |
| * |
| * @param <E> the type of the stream elements. |
| * @param iterator The iterator to adapt |
| * @return A new IOSpliterator |
| */ |
| static <E> IOSpliterator<E> adapt(final Spliterator<E> iterator) { |
| return IOSpliteratorAdapter.adapt(iterator); |
| } |
| |
| /** |
| * Constructs a {@link Spliterator} for this instance that throws {@link UncheckedIOException} instead of |
| * {@link IOException}. |
| * |
| * @return an {@link UncheckedIOException} {@link Spliterator}. |
| */ |
| default Spliterator<T> asSpliterator() { |
| return new UncheckedIOSpliterator<>(this); |
| } |
| |
| /** |
| * Like {@link Spliterator#characteristics()}. |
| * |
| * @return a representation of characteristics |
| */ |
| default int characteristics() { |
| return unwrap().characteristics(); |
| } |
| |
| /** |
| * Like {@link Spliterator#estimateSize()}. |
| * |
| * |
| * @return the estimated size, or {@code Long.MAX_VALUE} if infinite, unknown, or too expensive to compute. |
| */ |
| default long estimateSize() { |
| return unwrap().estimateSize(); |
| } |
| |
| /** |
| * Like {@link Spliterator#forEachRemaining(Consumer)}. |
| * |
| * @param action The action |
| * @throws NullPointerException if the specified action is null |
| */ |
| default void forEachRemaining(final IOConsumer<? super T> action) { |
| while (tryAdvance(action)) { // NOPMD |
| } |
| } |
| |
| /** |
| * Like {@link Spliterator#getComparator()}. |
| * |
| * @return a Comparator, or {@code null} if the elements are sorted in the natural order. |
| * @throws IllegalStateException if the spliterator does not report a characteristic of {@code SORTED}. |
| */ |
| @SuppressWarnings("unchecked") |
| default IOComparator<? super T> getComparator() { |
| return (IOComparator<T>) unwrap().getComparator(); |
| } |
| |
| /** |
| * Like {@link Spliterator#getExactSizeIfKnown()}. |
| * |
| * @return the exact size, if known, else {@code -1}. |
| */ |
| default long getExactSizeIfKnown() { |
| return unwrap().getExactSizeIfKnown(); |
| } |
| |
| /** |
| * Like {@link Spliterator#hasCharacteristics(int)}. |
| * |
| * @param characteristics the characteristics to check for |
| * @return {@code true} if all the specified characteristics are present, else {@code false} |
| */ |
| default boolean hasCharacteristics(final int characteristics) { |
| return unwrap().hasCharacteristics(characteristics); |
| } |
| |
| /** |
| * Like {@link Spliterator#tryAdvance(Consumer)}. |
| * |
| * @param action The action |
| * @return {@code false} if no remaining elements existed upon entry to this method, else {@code true}. |
| * @throws NullPointerException if the specified action is null |
| */ |
| default boolean tryAdvance(final IOConsumer<? super T> action) { |
| return unwrap().tryAdvance(Objects.requireNonNull(action, "action").asConsumer()); |
| } |
| |
| /** |
| * Like {@link Spliterator#trySplit()}. |
| * |
| * @return a {@code Spliterator} covering some portion of the elements, or {@code null} if this spliterator cannot be |
| * split |
| */ |
| default IOSpliterator<T> trySplit() { |
| return adapt(unwrap().trySplit()); |
| } |
| |
| /** |
| * Unwraps this instance and returns the underlying {@link Spliterator}. |
| * <p> |
| * Implementations may not have anything to unwrap and that behavior is undefined for now. |
| * </p> |
| * |
| * @return the underlying Spliterator. |
| */ |
| Spliterator<T> unwrap(); |
| |
| } |