1 /* 2 * Copyright (C) 2008 The Guava Authors 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.google.common.collect.testing; 18 19 import com.google.common.collect.testing.features.CollectionSize; 20 21 import java.util.ArrayList; 22 import java.util.Arrays; 23 import java.util.Collection; 24 import java.util.List; 25 26 /** 27 * Generator for collection of a particular size. 28 * 29 * <p>This class is GWT compatible. 30 * 31 * @author George van den Driessche 32 */ 33 public final class OneSizeGenerator<T, E> 34 implements OneSizeTestContainerGenerator<T, E> { 35 private final TestContainerGenerator<T, E> generator; 36 private final CollectionSize collectionSize; 37 38 public OneSizeGenerator(TestContainerGenerator<T, E> generator, 39 CollectionSize collectionSize) { 40 this.generator = generator; 41 this.collectionSize = collectionSize; 42 } 43 44 @Override 45 public TestContainerGenerator<T, E> getInnerGenerator() { 46 return generator; 47 } 48 49 @Override 50 public SampleElements<E> samples() { 51 return generator.samples(); 52 } 53 54 @Override 55 public T create(Object... elements) { 56 return generator.create(elements); 57 } 58 59 @Override 60 public E[] createArray(int length) { 61 return generator.createArray(length); 62 } 63 64 @Override 65 public T createTestSubject() { 66 Collection<E> elements = getSampleElements( 67 getCollectionSize().getNumElements()); 68 return generator.create(elements.toArray()); 69 } 70 71 @Override 72 public Collection<E> getSampleElements(int howMany) { 73 SampleElements<E> samples = samples(); 74 @SuppressWarnings("unchecked") 75 List<E> allSampleElements = Arrays.asList( 76 samples.e0, samples.e1, samples.e2, samples.e3, samples.e4); 77 return new ArrayList<E>(allSampleElements.subList(0, howMany)); 78 } 79 80 @Override 81 public CollectionSize getCollectionSize() { 82 return collectionSize; 83 } 84 85 @Override 86 public Iterable<E> order(List<E> insertionOrder) { 87 return generator.order(insertionOrder); 88 } 89 } 90
