Example

public boolean isInterface( SourceType o ) {
if ( o instanceof SourceType ){
try {
ISourceType type = (ISourceType)o.getElementInfo();
if ( type.isInterface() ){
return true;
}
} catch (Exception e){
e.printStackTrace();
}
}
return false;
}

Solution
To find out an alternative to use please consult Help, Eclipse discussion boards, or contact the team that provided the code for suggestions.