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// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
// https://developers.google.com/protocol-buffers/
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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.
*
* Usage example:
*
*
{@code
* private final static Parser FOO_PARSER = DiscardUnknownFieldsParser.wrap(Foo.parser());
* Foo parseFooDiscardUnknown(ByteBuffer input) throws IOException {
* return FOO_PARSER.parseFrom(input);
* }
* }
*
* 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 Parser wrap(final Parser parser) {
return new AbstractParser() {
@Override
public T parsePartialFrom(CodedInputStream input, ExtensionRegistryLite extensionRegistry)
throws InvalidProtocolBufferException {
try {
input.discardUnknownFields();
return parser.parsePartialFrom(input, extensionRegistry);
} finally {
input.unsetDiscardUnknownFields();
}
}
};
}
private DiscardUnknownFieldsParser() {}
}