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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.IteratorFeature.MODIFIABLE;
import static com.google.common.collect.testing.IteratorFeature.UNMODIFIABLE;
import static com.google.common.collect.testing.features.CollectionFeature.KNOWN_ORDER;
import static com.google.common.collect.testing.features.CollectionFeature.SUPPORTS_REMOVE;
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 java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import java.util.NoSuchElementException;
import java.util.Set;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.CopyOnWriteArraySet;
/**
* 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}.
*
* <p>This class is GWT compatible.
*
* @author Chris Povirk
*/
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);
}
// TODO: switch to DerivedIteratorTestSuiteBuilder
@CollectionFeature.Require({KNOWN_ORDER, SUPPORTS_REMOVE})
public void testIterator_knownOrderRemoveSupported() {
runIteratorTest(MODIFIABLE, IteratorTester.KnownOrder.KNOWN_ORDER,
getOrderedElements());
}
@CollectionFeature.Require(value = KNOWN_ORDER, absent = SUPPORTS_REMOVE)
public void testIterator_knownOrderRemoveUnsupported() {
runIteratorTest(UNMODIFIABLE, IteratorTester.KnownOrder.KNOWN_ORDER,
getOrderedElements());
}
@CollectionFeature.Require(absent = KNOWN_ORDER, value = SUPPORTS_REMOVE)
public void testIterator_unknownOrderRemoveSupported() {
runIteratorTest(MODIFIABLE, IteratorTester.KnownOrder.UNKNOWN_ORDER,
getSampleElements());
}
@CollectionFeature.Require(absent = {KNOWN_ORDER, SUPPORTS_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) {
{
// TODO: don't set this universally
ignoreSunJavaBug6529795();
}
@Override protected Iterator<E> newTargetIterator() {
resetCollection();
return collection.iterator();
}
@Override protected void verify(List<E> elements) {
expectContents(elements);
}
}.test();
}
/**
* Returns the {@link Method} instance for
* {@link #testIterator_knownOrderRemoveSupported()} so that tests of
* {@link CopyOnWriteArraySet} and {@link CopyOnWriteArrayList} can suppress
* it with {@code FeatureSpecificTestSuiteBuilder.suppressing()} until <a
* href="http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6570575">Sun bug
* 6570575</a> is fixed.
*/
public static Method getIteratorKnownOrderRemoveSupportedMethod() {
return Platform.getMethod(
CollectionIteratorTester.class, "testIterator_knownOrderRemoveSupported");
}
/**
* Returns the {@link Method} instance for
* {@link #testIterator_unknownOrderRemoveSupported()} so that tests of
* classes with unmodifiable iterators can suppress it.
*/
public static Method getIteratorUnknownOrderRemoveSupportedMethod() {
return Platform.getMethod(
CollectionIteratorTester.class, "testIterator_unknownOrderRemoveSupported");
}
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) {}
}
/**
* Returns the {@link Method} instance for
* {@link #testIterator_knownOrderRemoveUnsupported()} so that tests of
* {@code ArrayStack} can suppress it with
* {@code FeatureSpecificTestSuiteBuilder.suppressing()}. {@code ArrayStack}
* supports {@code remove()} on only the first element, and the iterator
* tester can't handle that.
*/
public static Method getIteratorKnownOrderRemoveUnsupportedMethod() {
return Platform.getMethod(
CollectionIteratorTester.class, "testIterator_knownOrderRemoveUnsupported");
}
}
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