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.annotations.GwtIncompatible;
20 import java.io.ByteArrayInputStream;
21 import java.io.ByteArrayOutputStream;
22 import java.io.IOException;
23 import java.io.ObjectInputStream;
24 import java.io.ObjectOutputStream;
25 import java.util.Collection;
26 import java.util.List;
27 
28 /**
29  * Reserializes the sets created by another test set generator.
30  *
31  * <p>TODO: make CollectionTestSuiteBuilder test reserialized collections
32  *
33  * @author Jesse Wilson
34  */
35 @GwtIncompatible
36 public class ReserializingTestCollectionGenerator<E> implements TestCollectionGenerator<E> {
37   private final TestCollectionGenerator<E> delegate;
38 
ReserializingTestCollectionGenerator(TestCollectionGenerator<E> delegate)39   ReserializingTestCollectionGenerator(TestCollectionGenerator<E> delegate) {
40     this.delegate = delegate;
41   }
42 
newInstance( TestCollectionGenerator<E> delegate)43   public static <E> ReserializingTestCollectionGenerator<E> newInstance(
44       TestCollectionGenerator<E> delegate) {
45     return new ReserializingTestCollectionGenerator<E>(delegate);
46   }
47 
48   @Override
create(Object... elements)49   public Collection<E> create(Object... elements) {
50     return reserialize(delegate.create(elements));
51   }
52 
53   @SuppressWarnings("unchecked")
reserialize(T object)54   static <T> T reserialize(T object) {
55     try {
56       ByteArrayOutputStream bytes = new ByteArrayOutputStream();
57       ObjectOutputStream out = new ObjectOutputStream(bytes);
58       out.writeObject(object);
59       ObjectInputStream in = new ObjectInputStream(new ByteArrayInputStream(bytes.toByteArray()));
60       return (T) in.readObject();
61     } catch (IOException | ClassNotFoundException e) {
62       Helpers.fail(e, e.getMessage());
63     }
64     throw new AssertionError("not reachable");
65   }
66 
67   @Override
samples()68   public SampleElements<E> samples() {
69     return delegate.samples();
70   }
71 
72   @Override
createArray(int length)73   public E[] createArray(int length) {
74     return delegate.createArray(length);
75   }
76 
77   @Override
order(List<E> insertionOrder)78   public Iterable<E> order(List<E> insertionOrder) {
79     return delegate.order(insertionOrder);
80   }
81 }
82