/**
* Get MIMEType which corresponds to file content. If file content does not allow to determine
* MIMEtype, the default MIMEType will be returned.
*
* @param filename the filename
* @param is the is
* @return String MIMEType
*/
public String getMimeType(String filename, InputStream is) {
String mimeType = getMimeType(filename);
if (resolver.getDefaultMimeType().equals(mimeType)) {
mimeType = resolver.getMimeType(filename, is);
}
return mimeType;
}
/**
* Get file extension corresponds to MIMEType. If MIMEType is empty or equals default MIMEType
* empty string will be returned. If there is no file extension for specific MIMEType the empty
* string will be returned also. In case when there are more than one extension for specific
* MIMEType the first occurred extension in the list will be returned if MIMEType ends with this
* extension otherwise just first occurred.
*
* @param mimeType MIMEType
* @return file extension
*/
public String getExtension(String mimeType) {
String extension = resolver.getExtension(mimeType);
if (extension.length() == 0) {
// use this resolver map (the same logic as in MimeTypeResolver)
mimeType = mimeType.toLowerCase();
if (mimeType.isEmpty() || mimeType.equals(resolver.getDefaultMimeType())) {
return "";
}
List<String> values = extentions.get(mimeType);
if (values == null) {
return "";
}
String resultExt = "";
for (String ext : values) {
if (mimeType.endsWith(ext)) {
return ext;
}
if (resultExt.isEmpty()) {
resultExt = ext;
}
}
extension = resultExt;
}
return extension;
}
/**
* Get MIMEType which corresponds to file extension. If file extension is unknown the default
* MIMEType will be returned. If there are more than one MIMETypes for specific extension the
* first occurred in the list will be returned.
*
* @param filename the filename
* @return String MIMEType
*/
public String getMimeType(String filename) {
String mimeType = resolver.getMimeType(filename);
if (resolver.getDefaultMimeType().equals(mimeType)) {
// default resolver didn't recognize the type
// try guess from this resolver map
String ext = filename.substring(filename.lastIndexOf(".") + 1);
if (ext.isEmpty()) {
ext = filename;
}
List<String> values = mimeTypes.get(ext.toLowerCase());
mimeType = values == null ? mimeType : values.get(0);
}
return mimeType;
}
/**
* Returns default MIMEType.
*
* @return String
*/
public String getDefaultMimeType() {
return resolver.getDefaultMimeType();
}