returns available capacity of this buffer . concode_field_sep int mode concode_elem_sep ByteBuffer buffer concode_elem_sep ByteBufferAllocator allocator concode_elem_sep int OUTPUT_MODE concode_elem_sep int INPUT_MODE concode_field_sep void expandCapacity concode_elem_sep void setOutputMode concode_elem_sep void expand concode_elem_sep void setInputMode concode_elem_sep boolean hasData concode_elem_sep int length concode_elem_sep void clear concode_elem_sep String toString concode_elem_sep int getMode concode_elem_sep void ensureCapacity concode_elem_sep int capacity