CODEWITHSUNDEEP
javaprotocol-buffers
Leajon
Leajon

Reputation: 219

How to get protobuf for Java Object by given message type name and raw bytes?

I have message type name in string and raw bytes. how to create java object by these meterials? b.proto

pakage foo;
message Bar {
 required int32 id = 1;
 required string name = 2;
}

TestMain.java

foo.Bar bar = foo.Bar.newBuilder()
.setId(1).setName("foobar").build();
byte[] rawbytes = bar.toByteArray();
String typeName = bar.getDescriptorForType().getFullName();

foo.Bar b = (foo.Bar) howTo(rawbyte, typeName);

Upvotes: 3

Views: 4411

Answers (1)

Jon Skeet
Jon Skeet

Reputation: 1501886

As I've said in my comments, it seems completely pointless to me, but you can easily just use reflection:

public static Object parseDynamic(String type, byte[] bytes) {
    try {
        Class<?> clazz = Class.forName(type);
        Method method = clazz.getDeclaredMethod("parseFrom", byte[].class);
        return method.invoke(null, bytes);
    } catch (NoSuchMethodException e) {
        throw new IllegalArgumentException("Non-message type", e);
    } catch (IllegalAccessException e) {
        throw new IllegalArgumentException("Non-message type", e);
    } catch (InvocationTargetException e) {
        // TODO: Work out what exactly you want to do.
        throw new IllegalArgumentException("Bad data?", e);
    }
}

Upvotes: 6

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