Method: Oj::StreamWriter.new

Defined in:
ext/oj/stream_writer.c

.new(io, options) ⇒ Object

Creates a new StreamWriter. Options are supported according the specified mode or the mode in the default options. Note that if mimic_JSON or Oj.optimize_rails has not been called then the behavior of the modes may not be the same as if they were.

In addition to the regular dump options for the various modes a :buffer_size option is available. It should be set to a positive integer. It is considered a hint of how large the initial internal buffer should be and also a hint on when to flush.

  • io [IO] stream to write to

  • options [Hash] formatting options



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# File 'ext/oj/stream_writer.c', line 74

static VALUE stream_writer_new(int argc, VALUE *argv, VALUE self) {
    StreamWriterType type   = STREAM_IO;
    int              fd     = 0;
    VALUE            stream = argv[0];
    VALUE            clas   = rb_obj_class(stream);
    StreamWriter     sw;
#if !IS_WINDOWS
    VALUE s;
#endif

    if (oj_stringio_class == clas) {
        type = STRING_IO;
#if !IS_WINDOWS
    } else if (rb_respond_to(stream, oj_fileno_id) && Qnil != (s = rb_funcall(stream, oj_fileno_id, 0)) &&
               0 != (fd = FIX2INT(s))) {
        type = FILE_IO;
#endif
    } else if (rb_respond_to(stream, oj_write_id)) {
        type = STREAM_IO;
    } else {
        rb_raise(rb_eArgError, "expected an IO Object.");
    }
    sw = OJ_R_ALLOC(struct _streamWriter);
    if (2 == argc && T_HASH == rb_type(argv[1])) {
        volatile VALUE v;
        int            buf_size = 0;

        if (Qundef == buffer_size_sym) {
            buffer_size_sym = ID2SYM(rb_intern("buffer_size"));
            rb_gc_register_address(&buffer_size_sym);
        }
        if (Qnil != (v = rb_hash_lookup(argv[1], buffer_size_sym))) {
            if (rb_cInteger != rb_obj_class(v)) {
                OJ_R_FREE(sw);
                rb_raise(rb_eArgError, ":buffer size must be a Integer.");
            }
            buf_size = FIX2INT(v);
        }
        oj_str_writer_init(&sw->sw, buf_size);
        oj_parse_options(argv[1], &sw->sw.opts);
        sw->flush_limit = buf_size;
    } else {
        oj_str_writer_init(&sw->sw, 4096);
        sw->flush_limit = 0;
    }
    sw->sw.out.indent = sw->sw.opts.indent;
    sw->stream        = stream;
    sw->type          = type;
    sw->fd            = fd;

    return TypedData_Wrap_Struct(oj_stream_writer_class, &oj_stream_writer_type, sw);
}