third_party/protobuf/java/core/src/main/java/com/google/protobuf/ExtensionRegistryFactory.java - Issue 2590803003: Revert "third_party/protobuf: Update to HEAD (83d681ee2c)"

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Issue 2590803003: Revert "third_party/protobuf: Update to HEAD (83d681ee2c)" (Closed)

Patch Set: Created 4 years ago

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1 // Protocol Buffers - Google's data interchange format

2 // Copyright 2008 Google Inc. All rights reserved.

3 // https://developers.google.com/protocol-buffers/

4 //

5 // Redistribution and use in source and binary forms, with or without

6 // modification, are permitted provided that the following conditions are

7 // met:

8 //

9 // * Redistributions of source code must retain the above copyright

10 // notice, this list of conditions and the following disclaimer.

11 // * Redistributions in binary form must reproduce the above

12 // copyright notice, this list of conditions and the following disclaimer

13 // in the documentation and/or other materials provided with the

14 // distribution.

15 // * Neither the name of Google Inc. nor the names of its

16 // contributors may be used to endorse or promote products derived from

17 // this software without specific prior written permission.

18 //

19 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

20 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

21 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

22 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

23 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

24 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

25 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

26 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

27 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

28 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

29 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

30

31 package com.google.protobuf;

32

33 import static com.google.protobuf.ExtensionRegistryLite.EMPTY_REGISTRY_LITE;

34

35 /**

36 * A factory object to create instances of {@link ExtensionRegistryLite}.

37 *

38 * <p>

39 * This factory detects (via reflection) if the full (non-Lite) protocol buffer libraries

40 * are available, and if so, the instances returned are actually {@link Extensio nRegistry}.

41 */

42 final class ExtensionRegistryFactory {

43

44 static final String FULL_REGISTRY_CLASS_NAME = "com.google.protobuf.ExtensionR egistry";

45

46 /* Visible for Testing

47 @Nullable */

48 static final Class<?> EXTENSION_REGISTRY_CLASS = reflectExtensionRegistry();

49

50 /* @Nullable */

51 static Class<?> reflectExtensionRegistry() {

52 try {

53 return Class.forName(FULL_REGISTRY_CLASS_NAME);

54 } catch (ClassNotFoundException e) {

55 // The exception allocation is potentially expensive on Android (where it can be triggered

56 // many times at start up). Is there a way to ameliorate this?

57 return null;

58 }

59 }

60

61 /** Construct a new, empty instance. */

62 public static ExtensionRegistryLite create() {

63 if (EXTENSION_REGISTRY_CLASS != null) {

64 try {

65 return invokeSubclassFactory("newInstance");

66 } catch (Exception e) {

67 // return a Lite registry.

68 }

69 }

70 return new ExtensionRegistryLite();

71 }

72

73 /** Get the unmodifiable singleton empty instance. */

74 public static ExtensionRegistryLite createEmpty() {

75 if (EXTENSION_REGISTRY_CLASS != null) {

76 try {

77 return invokeSubclassFactory("getEmptyRegistry");

78 } catch (Exception e) {

79 // return a Lite registry.

80 }

81 }

82 return EMPTY_REGISTRY_LITE;

83 }

84

85 static boolean isFullRegistry(ExtensionRegistryLite registry) {

86 return EXTENSION_REGISTRY_CLASS != null

87 && EXTENSION_REGISTRY_CLASS.isAssignableFrom(registry.getClass());

88 }

89

90 private static final ExtensionRegistryLite invokeSubclassFactory(String method Name)

91 throws Exception {

92 return (ExtensionRegistryLite) EXTENSION_REGISTRY_CLASS

93 .getMethod(methodName).invoke(null);

94 }

95 }

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