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Diffstat (limited to 'java/core/src/main/java/com/google/protobuf/DiscardUnknownFieldsParser.java')
-rw-r--r-- | java/core/src/main/java/com/google/protobuf/DiscardUnknownFieldsParser.java | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/java/core/src/main/java/com/google/protobuf/DiscardUnknownFieldsParser.java b/java/core/src/main/java/com/google/protobuf/DiscardUnknownFieldsParser.java new file mode 100644 index 00000000..7ae94349 --- /dev/null +++ b/java/core/src/main/java/com/google/protobuf/DiscardUnknownFieldsParser.java @@ -0,0 +1,71 @@ +// 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() {} +} |