| // 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; |
| |
| /** Parsers to discard unknown fields during parsing. */ |
| public final class DiscardUnknownFieldsParser { |
| |
| /** |
| * Warps 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() {} |
| } |