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    @JRubyMethod(name = "dump_all", required = 1, optional = 1, module = true, visibility = Visibility.PRIVATE)
    public static IRubyObject dump_all(IRubyObject self, IRubyObject[] args) {
        ThreadContext context = self.getRuntime().getCurrentContext();
        RubyArray objs = (RubyArray)args[0];
        IRubyObject io = null;
        IRubyObject io2 = null;
        if(args.length == 2 && args[1] != null && !args[1].isNil()) {
            io = args[1];
        }
        YAMLConfig cfg = YAML.config().version("1.0");
        IOOutputStream iox = null;
        if(null == io) {
            io2 = self.getRuntime().fastGetClass("StringIO").callMethod(context, "new");
            iox = new IOOutputStream(io2);
        } else {
            iox = new IOOutputStream(io);
        }
        Serializer ser = new JRubySerializer(new EmitterImpl(iox,cfg),new ResolverImpl(),cfg);
        try {
            ser.open();
            Representer r = new JRubyRepresenter(ser, cfg);
            for(Iterator iter = objs.getList().iterator();iter.hasNext();) {
                r.represent(iter.next());
            }
            ser.close();
        } catch(IOException e) {
            throw self.getRuntime().newIOErrorFromException(e);
        }
        if(null == io) {
            io2.callMethod(context, "rewind");
            return io2.callMethod(context, "read");
        } else {
            return io;
        }
    }