menteith :
I use the following lambda expression to iterate over PDF files.
public static void run(String arg) {
Path rootDir = Paths.get(arg);
PathMatcher matcher = FileSystems.getDefault().getPathMatcher("glob:**.pdf");
Files.walk(rootDir)
.filter(matcher::matches)
.forEach(Start::modify);
}
private static void modify(Path p) {
System.out.println(p.toString());
}
This part .forEach(Start::modify); executes the static method modify from the same class where the lambda expression is located. Is there a possibility to add something like else clause when no PDF file is found?
Ousmane D. :
You could collect the result after the filter operation into a list instance and then check the size before operating on it.
List<Path> resultSet = Files.walk(rootDir)
.filter(matcher::matches)
.collect(Collectors.toList());
if(resultSet.size() > 0){
resultSet.forEach(Start::modify);
}else {
// do something else
}
Alternatively, you could do something like this:
if(Files.walk(rootDir).anyMatch(matcher::matches)) {
Files.walk(rootDir)
.filter(matcher::matches)
.forEach(Start::modify);
}else {
// do something else
}
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