1   /*
2    * Copyright (C) 2009 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.testers;
18  
19  import com.google.common.annotations.GwtCompatible;
20  import com.google.gwt.core.client.GWT;
21  
22  /**
23   * The emulation source used in GWT.
24   *
25   * @author Hayward Chan
26   */
27  @GwtCompatible(emulated = true)
28  final class Platform {
29  
30    // Use fewer steps in the ListIteratorTester in ListListIteratorTester because it's slow in prod
31    // mode.
32    static int listListIteratorTesterNumIterations() {
33      // TODO(hhchan): It's 4 in java.  Figure out why even 3 is too slow in prod mode.
34      return GWT.isProdMode() ? 2 : 4;
35    }
36  
37    // Use fewer steps in the IteratorTester in CollectionIteratorTester because it's slow in prod
38    // mode..
39    static int collectionIteratorTesterNumIterations() {
40      return GWT.isProdMode() ? 3 : 5;
41    }
42  
43    // TODO: Consolidate different copies in one single place.
44    static String format(String template, Object... args) {
45      // start substituting the arguments into the '%s' placeholders
46      StringBuilder builder = new StringBuilder(
47          template.length() + 16 * args.length);
48      int templateStart = 0;
49      int i = 0;
50      while (i < args.length) {
51        int placeholderStart = template.indexOf("%s", templateStart);
52        if (placeholderStart == -1) {
53          break;
54        }
55        builder.append(template.substring(templateStart, placeholderStart));
56        builder.append(args[i++]);
57        templateStart = placeholderStart + 2;
58      }
59      builder.append(template.substring(templateStart));
60  
61      // if we run out of placeholders, append the extra args in square braces
62      if (i < args.length) {
63        builder.append(" [");
64        builder.append(args[i++]);
65        while (i < args.length) {
66          builder.append(", ");
67          builder.append(args[i++]);
68        }
69        builder.append("]");
70      }
71  
72      return builder.toString();
73    }
74  
75    private Platform() {}
76  }