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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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