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
17package com.google.common.testing;
18
19import static com.google.common.base.Preconditions.checkNotNull;
20
21import com.google.common.annotations.Beta;
22import com.google.common.annotations.GwtCompatible;
23
24import java.util.ArrayList;
25import java.util.LinkedList;
26import java.util.List;
27import java.util.logging.Level;
28import java.util.logging.Logger;
29
30/**
31 * A {@code TearDownStack} contains a stack of {@link TearDown} instances.
32 *
33 * @author Kevin Bourrillion
34 * @since 10.0
35 */
36@Beta
37@GwtCompatible
38public class TearDownStack implements TearDownAccepter {
39  private static final Logger logger = Logger.getLogger(TearDownStack.class.getName());
40
41  final LinkedList<TearDown> stack = new LinkedList<TearDown>();
42
43  private final boolean suppressThrows;
44
45  public TearDownStack() {
46    this.suppressThrows = false;
47  }
48
49  public TearDownStack(boolean suppressThrows) {
50    this.suppressThrows = suppressThrows;
51  }
52
53  @Override
54  public final void addTearDown(TearDown tearDown) {
55    stack.addFirst(checkNotNull(tearDown));
56  }
57
58  /**
59   * Causes teardown to execute.
60   */
61  public final void runTearDown() {
62    List<Throwable> exceptions = new ArrayList<Throwable>();
63    for (TearDown tearDown : stack) {
64      try {
65        tearDown.tearDown();
66      } catch (Throwable t) {
67        if (suppressThrows) {
68          logger.log(Level.INFO, "exception thrown during tearDown", t);
69        } else {
70          exceptions.add(t);
71        }
72      }
73    }
74    stack.clear();
75    if ((!suppressThrows) && (exceptions.size() > 0)) {
76      throw ClusterException.create(exceptions);
77    }
78  }
79}
80