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* Copyright (C) 2008 The Guava Authors
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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package com.google.common.collect.testing;
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import com.google.common.annotations.GwtCompatible;
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import java.util.Arrays;
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import java.util.Iterator;
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import java.util.Map.Entry;
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import org.checkerframework.checker.nullness.qual.Nullable;
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* A container class for the five sample elements we need for testing.
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* @author Kevin Bourrillion
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@ElementTypesAreNonnullByDefault
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public class SampleElements<E extends @Nullable Object> implements Iterable<E> {
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// TODO: rename e3, e4 => missing1, missing2
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public SampleElements(E e0, E e1, E e2, E e3, E e4) {
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public Iterator<E> iterator() {
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return asList().iterator();
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public List<E> asList() {
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return Arrays.asList(e0(), e1(), e2(), e3(), e4());
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public static class Strings extends SampleElements<String> {
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// elements aren't sorted, to better test SortedSet iteration ordering
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super("b", "a", "c", "d", "e");
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// for testing SortedSet and SortedMap methods
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public static final String BEFORE_FIRST = "\0";
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public static final String BEFORE_FIRST_2 = "\0\0";
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public static final String MIN_ELEMENT = "a";
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public static final String AFTER_LAST = "z";
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public static final String AFTER_LAST_2 = "zz";
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public static class Chars extends SampleElements<Character> {
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// elements aren't sorted, to better test SortedSet iteration ordering
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super('b', 'a', 'c', 'd', 'e');
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public static class Enums extends SampleElements<AnEnum> {
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// elements aren't sorted, to better test SortedSet iteration ordering
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super(AnEnum.B, AnEnum.A, AnEnum.C, AnEnum.D, AnEnum.E);
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public static class Ints extends SampleElements<Integer> {
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// elements aren't sorted, to better test SortedSet iteration ordering
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public static <K extends @Nullable Object, V extends @Nullable Object>
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SampleElements<Entry<K, V>> mapEntries(SampleElements<K> keys, SampleElements<V> values) {
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return new SampleElements<>(
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Helpers.mapEntry(keys.e0(), values.e0()),
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Helpers.mapEntry(keys.e1(), values.e1()),
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Helpers.mapEntry(keys.e2(), values.e2()),
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Helpers.mapEntry(keys.e3(), values.e3()),
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Helpers.mapEntry(keys.e4(), values.e4()));
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public static class Unhashables extends SampleElements<UnhashableObject> {
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public Unhashables() {
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new UnhashableObject(1),
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new UnhashableObject(2),
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new UnhashableObject(3),
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new UnhashableObject(4),
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new UnhashableObject(5));
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public static class Colliders extends SampleElements<Object> {
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super(new Collider(1), new Collider(2), new Collider(3), new Collider(4), new Collider(5));
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private static class Collider {
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Collider(int value) {
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public boolean equals(@Nullable Object obj) {
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return obj instanceof Collider && ((Collider) obj).value == value;
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public int hashCode() {