xref: /external/guava/guava-testlib/src/com/google/common/collect/testing/ListIteratorTester.java

/*
 * Copyright (C) 2007 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;

import java.util.ArrayList;
import java.util.List;
import java.util.ListIterator;

/**
 * A utility similar to {@link IteratorTester} for testing a
 * {@link ListIterator} against a known good reference implementation. As with
 * {@code IteratorTester}, a concrete subclass must provide target iterators on
 * demand. It also requires three additional constructor parameters:
 * {@code elementsToInsert}, the elements to be passed to {@code set()} and
 * {@code add()} calls; {@code features}, the features supported by the
 * iterator; and {@code expectedElements}, the elements the iterator should
 * return in order.
 * <p>
 * The items in {@code elementsToInsert} will be repeated if {@code steps} is
 * larger than the number of provided elements.
 *
 * <p>This class is GWT compatible.
 *
 * @author Chris Povirk
 */
public abstract class ListIteratorTester<E> extends
    AbstractIteratorTester<E, ListIterator<E>> {
  protected ListIteratorTester(int steps, Iterable<E> elementsToInsert,
      Iterable<? extends IteratorFeature> features,
      Iterable<E> expectedElements, int startIndex) {
    super(steps, elementsToInsert, features, expectedElements,
        KnownOrder.KNOWN_ORDER, startIndex);
  }

  @Override
  protected final Iterable<? extends Stimulus<E, ? super ListIterator<E>>>
      getStimulusValues() {
    List<Stimulus<E, ? super ListIterator<E>>> list =
        new ArrayList<Stimulus<E, ? super ListIterator<E>>>();
    Helpers.addAll(list, iteratorStimuli());
    Helpers.addAll(list, listIteratorStimuli());
    return list;
  }

  @Override protected abstract ListIterator<E> newTargetIterator();
}