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/*
* Copyright (C) 2008 The Guava Authors
*
* 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 com.google.common.collect.testing.testers;
import static com.google.common.collect.testing.Helpers.mapEntry;
import static com.google.common.collect.testing.IteratorFeature.MODIFIABLE;
import static com.google.common.collect.testing.IteratorFeature.UNMODIFIABLE;
import static com.google.common.collect.testing.features.CollectionFeature.ALLOWS_NULL_VALUES;
import static com.google.common.collect.testing.features.CollectionFeature.KNOWN_ORDER;
import static com.google.common.collect.testing.features.CollectionFeature.SUPPORTS_ITERATOR_REMOVE;
import static com.google.common.collect.testing.features.CollectionSize.ZERO;
import static java.util.Arrays.asList;
import com.google.common.annotations.GwtCompatible;
import com.google.common.collect.testing.AbstractCollectionTester;
import com.google.common.collect.testing.Helpers;
import com.google.common.collect.testing.IteratorFeature;
import com.google.common.collect.testing.IteratorTester;
import com.google.common.collect.testing.features.CollectionFeature;
import com.google.common.collect.testing.features.CollectionSize;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import java.util.Map.Entry;
import java.util.NoSuchElementException;
import java.util.Set;
import org.junit.Ignore;
/**
* A generic JUnit test which tests {@code iterator} operations on a collection. Can't be invoked
* directly; please see {@link com.google.common.collect.testing.CollectionTestSuiteBuilder}.
*
* @author Chris Povirk
*/
@GwtCompatible(emulated = true)
@Ignore // Affects only Android test runner, which respects JUnit 4 annotations on JUnit 3 tests.
public class CollectionIteratorTester<E> extends AbstractCollectionTester<E> {
public void testIterator() {
List<E> iteratorElements = new ArrayList<E>();
for (E element : collection) { // uses iterator()
iteratorElements.add(element);
}
Helpers.assertEqualIgnoringOrder(Arrays.asList(createSamplesArray()), iteratorElements);
}
@CollectionFeature.Require(KNOWN_ORDER)
public void testIterationOrdering() {
List<E> iteratorElements = new ArrayList<E>();
for (E element : collection) { // uses iterator()
iteratorElements.add(element);
}
List<E> expected = Helpers.copyToList(getOrderedElements());
assertEquals("Different ordered iteration", expected, iteratorElements);
}
@CollectionFeature.Require(ALLOWS_NULL_VALUES)
@CollectionSize.Require(absent = ZERO)
public void testIterator_nullElement() {
initCollectionWithNullElement();
List<E> iteratorElements = new ArrayList<E>();
for (E element : collection) { // uses iterator()
iteratorElements.add(element);
}
Helpers.assertEqualIgnoringOrder(asList(createArrayWithNullElement()), iteratorElements);
}
@CollectionFeature.Require(SUPPORTS_ITERATOR_REMOVE)
@CollectionSize.Require(absent = ZERO)
public void testIterator_removeAffectsBackingCollection() {
int originalSize = collection.size();
Iterator<E> iterator = collection.iterator();
Object element = iterator.next();
// If it's an Entry, it may become invalid once it's removed from the Map. Copy it.
if (element instanceof Entry) {
Entry<?, ?> entry = (Entry<?, ?>) element;
element = mapEntry(entry.getKey(), entry.getValue());
}
assertTrue(collection.contains(element)); // sanity check
iterator.remove();
assertFalse(collection.contains(element));
assertEquals(originalSize - 1, collection.size());
}
@CollectionFeature.Require({KNOWN_ORDER, SUPPORTS_ITERATOR_REMOVE})
public void testIterator_knownOrderRemoveSupported() {
runIteratorTest(MODIFIABLE, IteratorTester.KnownOrder.KNOWN_ORDER, getOrderedElements());
}
@CollectionFeature.Require(value = KNOWN_ORDER, absent = SUPPORTS_ITERATOR_REMOVE)
public void testIterator_knownOrderRemoveUnsupported() {
runIteratorTest(UNMODIFIABLE, IteratorTester.KnownOrder.KNOWN_ORDER, getOrderedElements());
}
@CollectionFeature.Require(absent = KNOWN_ORDER, value = SUPPORTS_ITERATOR_REMOVE)
public void testIterator_unknownOrderRemoveSupported() {
runIteratorTest(MODIFIABLE, IteratorTester.KnownOrder.UNKNOWN_ORDER, getSampleElements());
}
@CollectionFeature.Require(absent = {KNOWN_ORDER, SUPPORTS_ITERATOR_REMOVE})
public void testIterator_unknownOrderRemoveUnsupported() {
runIteratorTest(UNMODIFIABLE, IteratorTester.KnownOrder.UNKNOWN_ORDER, getSampleElements());
}
private void runIteratorTest(
Set<IteratorFeature> features, IteratorTester.KnownOrder knownOrder, Iterable<E> elements) {
new IteratorTester<E>(
Platform.collectionIteratorTesterNumIterations(), features, elements, knownOrder) {
@Override
protected Iterator<E> newTargetIterator() {
resetCollection();
return collection.iterator();
}
@Override
protected void verify(List<E> elements) {
expectContents(elements);
}
}.test();
}
public void testIteratorNoSuchElementException() {
Iterator<E> iterator = collection.iterator();
while (iterator.hasNext()) {
iterator.next();
}
try {
iterator.next();
fail("iterator.next() should throw NoSuchElementException");
} catch (NoSuchElementException expected) {
}
}
}
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