/**
* Unwraps nested wrapped writers until the given writer class is found.
*
* @param writerClass Class of the desired nested writer. If null, the core writer (i.e., deepest
* wrapped writer) will be returned.
* @param id Id to use as a basis when unwrapping any nested {@link ImageWriter}s. If null, the
* current id is used.
*/
public IFormatWriter unwrap(Class<? extends IFormatWriter> writerClass, String id)
throws FormatException, IOException {
IFormatWriter w = this;
while (w instanceof WriterWrapper || w instanceof ImageWriter) {
if (writerClass != null && writerClass.isInstance(w)) break;
if (w instanceof ImageWriter) {
ImageWriter iw = (ImageWriter) w;
w = id == null ? iw.getWriter() : iw.getWriter(id);
} else w = ((WriterWrapper) w).getWriter();
}
if (writerClass != null && !writerClass.isInstance(w)) return null;
return w;
}
