1 // Protocol Buffers - Google's data interchange format 2 // Copyright 2008 Google Inc. All rights reserved. 3 // 4 // Use of this source code is governed by a BSD-style 5 // license that can be found in the LICENSE file or at 6 // https://developers.google.com/open-source/licenses/bsd 7 8 package com.google.protobuf; 9 10 /** A factory for message info that is generated into the message itself. */ 11 @ExperimentalApi 12 class GeneratedMessageInfoFactory implements MessageInfoFactory { 13 14 private static final GeneratedMessageInfoFactory instance = new GeneratedMessageInfoFactory(); 15 16 // Disallow construction - it's a singleton. GeneratedMessageInfoFactory()17 private GeneratedMessageInfoFactory() {} 18 getInstance()19 public static GeneratedMessageInfoFactory getInstance() { 20 return instance; 21 } 22 23 @Override isSupported(Class<?> messageType)24 public boolean isSupported(Class<?> messageType) { 25 return GeneratedMessageLite.class.isAssignableFrom(messageType); 26 } 27 28 @Override messageInfoFor(Class<?> messageType)29 public MessageInfo messageInfoFor(Class<?> messageType) { 30 if (!GeneratedMessageLite.class.isAssignableFrom(messageType)) { 31 throw new IllegalArgumentException("Unsupported message type: " + messageType.getName()); 32 } 33 34 try { 35 return (MessageInfo) GeneratedMessageLite.getDefaultInstance( 36 messageType.asSubclass(GeneratedMessageLite.class)) 37 .buildMessageInfo(); 38 } catch (Exception e) { 39 throw new RuntimeException("Unable to get message info for " + messageType.getName(), e); 40 } 41 } 42 } 43