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Collections:
Other Resources:
commons-collections4-4.2-sources.jar - Apache Commons Collections
commons-collections4-4.2-sources.jar is the source JAR file for Apache Commons Collections 4.2, which
provides additional collection handling functionalities on top of JDK library.
JAR File Size and Download Location:
JAR name: commons-collections4-4.2-sources.jar Target JDK version: 1.7 Dependency: None File size: 708,599 bytes Release date: 08-Jul-2018 Download: Apache Commons Collections
✍: FYIcenter.com
⏎ org/apache/commons/collections4/iterators/PushbackIterator.java
/* * 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.collections4.iterators; import java.util.ArrayDeque; import java.util.Deque; import java.util.Iterator; /** * Decorates an iterator to support pushback of elements. * <p> * The decorator stores the pushed back elements in a LIFO manner: the last element * that has been pushed back, will be returned as the next element in a call to {@link #next()}. * <p> * The decorator does not support the removal operation. Any call to {@link #remove()} will * result in an {@link UnsupportedOperationException}. * * @since 4.0 */ public class PushbackIterator<E> implements Iterator<E> { /** The iterator being decorated. */ private final Iterator<? extends E> iterator; /** The LIFO queue containing the pushed back items. */ private final Deque<E> items = new ArrayDeque<>(); //----------------------------------------------------------------------- /** * Decorates the specified iterator to support one-element lookahead. * <p> * If the iterator is already a {@link PushbackIterator} it is returned directly. * * @param <E> the element type * @param iterator the iterator to decorate * @return a new peeking iterator * @throws NullPointerException if the iterator is null */ public static <E> PushbackIterator<E> pushbackIterator(final Iterator<? extends E> iterator) { if (iterator == null) { throw new NullPointerException("Iterator must not be null"); } if (iterator instanceof PushbackIterator<?>) { @SuppressWarnings("unchecked") // safe cast final PushbackIterator<E> it = (PushbackIterator<E>) iterator; return it; } return new PushbackIterator<>(iterator); } //----------------------------------------------------------------------- /** * Constructor. * * @param iterator the iterator to decorate */ public PushbackIterator(final Iterator<? extends E> iterator) { super(); this.iterator = iterator; } /** * Push back the given element to the iterator. * <p> * Calling {@link #next()} immediately afterwards will return exactly this element. * * @param item the element to push back to the iterator */ public void pushback(final E item) { items.push(item); } @Override public boolean hasNext() { return !items.isEmpty() ? true : iterator.hasNext(); } @Override public E next() { return !items.isEmpty() ? items.pop() : iterator.next(); } /** * This iterator will always throw an {@link UnsupportedOperationException}. * * @throws UnsupportedOperationException always */ @Override public void remove() { throw new UnsupportedOperationException(); } }
⏎ org/apache/commons/collections4/iterators/PushbackIterator.java
Or download all of them as a single archive file:
File name: commons-collections4-4.2-sources.jar File size: 708599 bytes Release date: 2018-07-08 Download
⇒ Download and Install commons-collections4-4.1-bin.zip
⇐ What Is commons-collections4-4.2.jar
2023-03-28, 35563👍, 0💬
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