1// Copyright 2016 The Bazel Authors. All rights reserved.
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7//    http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14package com.google.devtools.build.android.desugar;
15
16import org.objectweb.asm.Opcodes;
17
18/** Convenience method for working with {@code int} bitwise flags. */
19class BitFlags {
20
21  /**
22   * Returns {@code true} iff <b>all</b> bits in {@code bitmask} are set in {@code flags}. Trivially
23   * returns {@code true} if {@code bitmask} is 0.
24   */
25  public static boolean isSet(int flags, int bitmask) {
26    return (flags & bitmask) == bitmask;
27  }
28
29  /**
30   * Returns {@code true} iff <b>none</b> of the bits in {@code bitmask} are set in {@code flags}.
31   * Trivially returns {@code true} if {@code bitmask} is 0.
32   */
33  public static boolean noneSet(int flags, int bitmask) {
34    return (flags & bitmask) == 0;
35  }
36
37  public static boolean isInterface(int access) {
38    return isSet(access, Opcodes.ACC_INTERFACE);
39  }
40
41  public static boolean isStatic(int access) {
42    return isSet(access, Opcodes.ACC_STATIC);
43  }
44
45  public static boolean isSynthetic(int access) {
46    return isSet(access, Opcodes.ACC_SYNTHETIC);
47  }
48
49  // Static methods only
50  private BitFlags() {}
51}
52