001/* 002 * Copyright (C) 2008 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.features.CollectionSize; 021import java.util.ArrayList; 022import java.util.Arrays; 023import java.util.Collection; 024import java.util.List; 025 026/** 027 * Generator for collection of a particular size. 028 * 029 * @author George van den Driessche 030 */ 031@GwtCompatible 032public final class OneSizeGenerator<T, E> implements OneSizeTestContainerGenerator<T, E> { 033 private final TestContainerGenerator<T, E> generator; 034 private final CollectionSize collectionSize; 035 036 public OneSizeGenerator(TestContainerGenerator<T, E> generator, CollectionSize collectionSize) { 037 this.generator = generator; 038 this.collectionSize = collectionSize; 039 } 040 041 @Override 042 public TestContainerGenerator<T, E> getInnerGenerator() { 043 return generator; 044 } 045 046 @Override 047 public SampleElements<E> samples() { 048 return generator.samples(); 049 } 050 051 @Override 052 public T create(Object... elements) { 053 return generator.create(elements); 054 } 055 056 @Override 057 public E[] createArray(int length) { 058 return generator.createArray(length); 059 } 060 061 @Override 062 public T createTestSubject() { 063 Collection<E> elements = getSampleElements(getCollectionSize().getNumElements()); 064 return generator.create(elements.toArray()); 065 } 066 067 @Override 068 public Collection<E> getSampleElements(int howMany) { 069 SampleElements<E> samples = samples(); 070 @SuppressWarnings("unchecked") 071 List<E> allSampleElements = 072 Arrays.asList(samples.e0(), samples.e1(), samples.e2(), samples.e3(), samples.e4()); 073 return new ArrayList<>(allSampleElements.subList(0, howMany)); 074 } 075 076 @Override 077 public CollectionSize getCollectionSize() { 078 return collectionSize; 079 } 080 081 @Override 082 public Iterable<E> order(List<E> insertionOrder) { 083 return generator.order(insertionOrder); 084 } 085}