001/*
002 * Copyright (C) 2007 The Guava Authors
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package com.google.common.collect.testing;
018
019import com.google.common.annotations.GwtCompatible;
020import com.google.common.collect.testing.SampleElements.Strings;
021import java.util.List;
022import java.util.Set;
023
024/**
025 * Create string sets for collection tests.
026 *
027 * @author Kevin Bourrillion
028 */
029@GwtCompatible
030@ElementTypesAreNonnullByDefault
031public abstract class TestStringSetGenerator implements TestSetGenerator<String> {
032  @Override
033  public SampleElements<String> samples() {
034    return new Strings();
035  }
036
037  @Override
038  public Set<String> create(Object... elements) {
039    String[] array = new String[elements.length];
040    int i = 0;
041    for (Object e : elements) {
042      array[i++] = (String) e;
043    }
044    return create(array);
045  }
046
047  protected abstract Set<String> create(String[] elements);
048
049  @Override
050  public String[] createArray(int length) {
051    return new String[length];
052  }
053
054  /**
055   * {@inheritDoc}
056   *
057   * <p>By default, returns the supplied elements in their given order; however, generators for
058   * containers with a known order other than insertion order must override this method.
059   *
060   * <p>Note: This default implementation is overkill (but valid) for an unordered container. An
061   * equally valid implementation for an unordered container is to throw an exception. The chosen
062   * implementation, however, has the advantage of working for insertion-ordered containers, as
063   * well.
064   */
065  @Override
066  public List<String> order(List<String> insertionOrder) {
067    return insertionOrder;
068  }
069}