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
17package com.google.common.base;
18
19import com.google.common.annotations.GwtCompatible;
20
21/**
22 * Methods factored out so that they can be emulated differently in GWT.
23 *
24 * @author Jesse Wilson
25 */
26@GwtCompatible(emulated = true)
27final class Platform {
28  private Platform() {}
29
30  /** Returns a thread-local 1024-char array. */
31  static char[] charBufferFromThreadLocal() {
32    return DEST_TL.get();
33  }
34
35  /** Calls {@link System#nanoTime()}. */
36  static long systemNanoTime() {
37    return System.nanoTime();
38  }
39
40  /**
41   * A thread-local destination buffer to keep us from creating new buffers.
42   * The starting size is 1024 characters.  If we grow past this we don't
43   * put it back in the threadlocal, we just keep going and grow as needed.
44   */
45  private static final ThreadLocal<char[]> DEST_TL = new ThreadLocal<char[]>() {
46    @Override
47    protected char[] initialValue() {
48      return new char[1024];
49    }
50  };
51
52  static CharMatcher precomputeCharMatcher(CharMatcher matcher) {
53    return matcher.precomputedInternal();
54  }
55}
56