ProtoTextMessageReader.java

package net.morimekta.proto.sio;

import com.google.protobuf.Descriptors;
import com.google.protobuf.Message;
import com.google.protobuf.TextFormat;
import net.morimekta.proto.ProtoMessage;

import java.io.IOException;
import java.io.Reader;

import static java.util.Objects.requireNonNull;

/**
 * Reader for reading files using the proto text format.
 */
public class ProtoTextMessageReader implements MessageReader {
    private final Reader            reader;
    private final TextFormat.Parser parser;

    /**
     * @param reader Reader to read from.
     */
    public ProtoTextMessageReader(Reader reader) {
        this(reader, false);
    }

    /**
     * @param reader  Reader to read from.
     * @param lenient If messages should be read leniently.
     */
    public ProtoTextMessageReader(Reader reader, boolean lenient) {
        this.reader = requireNonNull(reader, "in == null");
        this.parser = TextFormat.Parser.newBuilder()
                                       .setAllowUnknownExtensions(lenient)
                                       .setAllowUnknownFields(lenient)
                                       .build();
    }

    @Override
    public Message read(Descriptors.Descriptor descriptor) throws IOException {
        requireNonNull(descriptor, "descriptor == null");
        var builder = ProtoMessage.newBuilder(descriptor);
        parser.merge(reader, builder);
        return builder.build();
    }
}