1/*
2 * Copyright (C) 2009 Google Inc.
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.android.mail.lib.base;
18
19
20/**
21 * Methods factored out so that they can be emulated differently in GWT.
22 *
23 * @author Jesse Wilson
24 */
25final class Platform {
26  private Platform() {}
27
28  /**
29   * Calls {@link Class#isInstance(Object)}.
30   *
31   * <p>This method is not supported in GWT yet.
32   */
33  static boolean isInstance(Class<?> clazz, Object obj) {
34    return clazz.isInstance(obj);
35  }
36
37  /** Returns a thread-local 1024-char array. */
38  static char[] charBufferFromThreadLocal() {
39    return DEST_TL.get();
40  }
41
42  /**
43   * A thread-local destination buffer to keep us from creating new buffers.
44   * The starting size is 1024 characters.  If we grow past this we don't
45   * put it back in the threadlocal, we just keep going and grow as needed.
46   */
47  private static final ThreadLocal<char[]> DEST_TL = new ThreadLocal<char[]>() {
48    @Override
49    protected char[] initialValue() {
50      return new char[1024];
51    }
52  };
53
54  static CharMatcher precomputeCharMatcher(CharMatcher matcher) {
55    return matcher.precomputedInternal();
56  }
57}
58