Avoiding multiple If statements in Java

Question

I\'ve coded a method something like this. But I guess this should undergo refactoring. Can any one suggest the best approach to avoid using this multiple if statements?

Answer 1

How about mapping the extensions to MIME types, then using a loop? Something like:

Map suffixMappings = new HashMap();
suffixMappings.put(".pdf", "application/pdf");
...

private String getMimeType(String fileName){
    if (fileName == null) {
        return "";   
    }
    String suffix = fileName.substring(fileName.lastIndexOf('.'));
    // If fileName might not have extension, check for that above!
    String mimeType = suffixMappings.get(suffix); 
    return mimeType == null ? "text/plain" : mimeType;
 }