| // Protocol Buffers - Google's data interchange format |
| // Copyright 2008 Google Inc. All rights reserved. |
| // |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file or at |
| // https://developers.google.com/open-source/licenses/bsd |
| |
| package com.google.protobuf; |
| |
| /** Parsers to discard unknown fields during parsing. */ |
| public final class DiscardUnknownFieldsParser { |
| |
| /** |
| * Wraps a given {@link Parser} into a new {@link Parser} that discards unknown fields during |
| * parsing. |
| * |
| * <p>Usage example: |
| * |
| * <pre>{@code |
| * private final static Parser<Foo> FOO_PARSER = DiscardUnknownFieldsParser.wrap(Foo.parser()); |
| * Foo parseFooDiscardUnknown(ByteBuffer input) throws IOException { |
| * return FOO_PARSER.parseFrom(input); |
| * } |
| * }</pre> |
| * |
| * <p>Like all other implementations of {@code Parser}, this parser is stateless and thread-safe. |
| * |
| * @param parser The delegated parser that parses messages. |
| * @return a {@link Parser} that will discard unknown fields during parsing. |
| */ |
| public static final <T extends Message> Parser<T> wrap(final Parser<T> parser) { |
| return new AbstractParser<T>() { |
| @Override |
| public T parsePartialFrom(CodedInputStream input, ExtensionRegistryLite extensionRegistry) |
| throws InvalidProtocolBufferException { |
| try { |
| input.discardUnknownFields(); |
| return parser.parsePartialFrom(input, extensionRegistry); |
| } finally { |
| input.unsetDiscardUnknownFields(); |
| } |
| } |
| }; |
| } |
| |
| private DiscardUnknownFieldsParser() {} |
| } |