diff options
Diffstat (limited to 'third_party/protobuf/3.6.0/java/core/src/main/java/com/google/protobuf/ExtensionRegistryFactory.java')
-rw-r--r-- | third_party/protobuf/3.6.0/java/core/src/main/java/com/google/protobuf/ExtensionRegistryFactory.java | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/third_party/protobuf/3.6.0/java/core/src/main/java/com/google/protobuf/ExtensionRegistryFactory.java b/third_party/protobuf/3.6.0/java/core/src/main/java/com/google/protobuf/ExtensionRegistryFactory.java new file mode 100644 index 0000000000..89f7ab9b33 --- /dev/null +++ b/third_party/protobuf/3.6.0/java/core/src/main/java/com/google/protobuf/ExtensionRegistryFactory.java @@ -0,0 +1,96 @@ +// Protocol Buffers - Google's data interchange format +// Copyright 2008 Google Inc. All rights reserved. +// https://developers.google.com/protocol-buffers/ +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are +// met: +// +// * Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// * Redistributions in binary form must reproduce the above +// copyright notice, this list of conditions and the following disclaimer +// in the documentation and/or other materials provided with the +// distribution. +// * Neither the name of Google Inc. nor the names of its +// contributors may be used to endorse or promote products derived from +// this software without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +package com.google.protobuf; + +import static com.google.protobuf.ExtensionRegistryLite.EMPTY_REGISTRY_LITE; + +/** + * A factory object to create instances of {@link ExtensionRegistryLite}. + * + * <p> + * This factory detects (via reflection) if the full (non-Lite) protocol buffer libraries + * are available, and if so, the instances returned are actually {@link ExtensionRegistry}. + */ +final class ExtensionRegistryFactory { + + static final String FULL_REGISTRY_CLASS_NAME = "com.google.protobuf.ExtensionRegistry"; + + /* Visible for Testing + @Nullable */ + static final Class<?> EXTENSION_REGISTRY_CLASS = reflectExtensionRegistry(); + + /* @Nullable */ + static Class<?> reflectExtensionRegistry() { + try { + return Class.forName(FULL_REGISTRY_CLASS_NAME); + } catch (ClassNotFoundException e) { + // The exception allocation is potentially expensive on Android (where it can be triggered + // many times at start up). Is there a way to ameliorate this? + return null; + } + } + + /** Construct a new, empty instance. */ + public static ExtensionRegistryLite create() { + if (EXTENSION_REGISTRY_CLASS != null) { + try { + return invokeSubclassFactory("newInstance"); + } catch (Exception e) { + // return a Lite registry. + } + } + return new ExtensionRegistryLite(); + } + + /** Get the unmodifiable singleton empty instance. */ + public static ExtensionRegistryLite createEmpty() { + if (EXTENSION_REGISTRY_CLASS != null) { + try { + return invokeSubclassFactory("getEmptyRegistry"); + } catch (Exception e) { + // return a Lite registry. + } + } + return EMPTY_REGISTRY_LITE; + } + + + static boolean isFullRegistry(ExtensionRegistryLite registry) { + return EXTENSION_REGISTRY_CLASS != null + && EXTENSION_REGISTRY_CLASS.isAssignableFrom(registry.getClass()); + } + + private static final ExtensionRegistryLite invokeSubclassFactory(String methodName) + throws Exception { + return (ExtensionRegistryLite) EXTENSION_REGISTRY_CLASS + .getDeclaredMethod(methodName).invoke(null); + } +} |