How minSize pass and maxSize no!?

Question about the task

Advanced file search

Java Collections, Level 1, Lesson 2

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Any hint will be appreciated! Tk you! 🙂

Let's implement a configurable file search within a directory.
Look over the java.nio.file.FileVisitor interface and its superclass's implementation java.nio.file.SimpleFileVisitor.
When searching a file tree using the Files.walkFileTree(Path start, FileVisitor<? super Path> visitor) method,
we use the FileVisitor object to perform the required operations on the found Path objects.

Our search class will be called SearchFileVisitor and will extend SimpleFileVisitor.

You can search using the following criteria:
- a term found in the file name (String);
- a term found in the file's contents (String);
- a maximum or minimum file size (int).
You can specify several criteria at the same time.

I wrote code in main that uses the ready-to-use SearchFileVisitor to search for files. All you have to do is implement it. Simple!
Hint 1: The get... and set... methods are getters and setters. The search class's main logic is performed in the visitFile(Path file, BasicFileAttributes attrs) method.
Hint 2: Only use classes from the java.nio package to work with files.

Requirements:

In the SearchFileVisitor class, you need to create partOfName, partOfContent, minSize, and maxSize fields, as well as the corresponding setters.
In the SearchFileVisitor class, you need to create a foundFiles field and a corresponding getter. The field must be initialized immediately.
If a partOfName search criterion is passed to SearchFileVisitor, the visitFile method must add the file to foundFiles if the name contains the value of partOfName.
If a partOfContent search criterion is passed to SearchFileVisitor, the visitFile method must add the file to foundFiles if the file's contents contain the value of partOfContent.
If a maxSize search criterion is passed to SearchFileVisitor, the visitFile method must add the file to foundFiles if the file size is less than maxSize.
If a minSize search criterion is passed to SearchFileVisitor, the visitFile method must add the file to foundFiles if the file size is greater than minSize.
The visitFile method's implementation must allow for several search criteria to be passed at the same time.

package com.codegym.task.task31.task3111; import java.io.IOException; import java.nio.file.Files; import java.nio.file.Path; import java.nio.file.Paths; import java.util.List; /* Advanced file search */ public class Solution { public static void main(String[] args) throws IOException { SearchFileVisitor searchFileVisitor = new SearchFileVisitor(); searchFileVisitor.setPartOfName("amigo"); searchFileVisitor.setPartOfContent("programmer"); searchFileVisitor.setMinSize(500); searchFileVisitor.setMaxSize(10000); Files.walkFileTree(Paths.get("D:/SecretFolder"), searchFileVisitor); List<Path> foundFiles = searchFileVisitor.getFoundFiles(); for (Path file : foundFiles) { System.out.println(file); } } }

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Lisa L

Level 47 , Nuremberg, Germany

17 March 2022, 10:10

You can search using the following criteria: ... You can specify several criteria at the same time. but you mustn't... that's what CG says. Now try what happens if you do not set the maxSize (comment out line 22)

Angel Stefan

Level 23 , Sibiu, Romania

20 March 2022, 01:08

If i don't use this criteria how can i search a specific file? I don't understand because this data Is all i have. 🙁 Unfortunately i don' t see another solution.

Lisa L

Level 47 , Nuremberg, Germany

20 March 2022, 08:06

Like in any file manager. If you search for a file name, type it into the search box. If you want to search for the a max size, then in explorer you type eg. size:<20kb Now, to test how your max file size criteria works (or not) just set a name (oh, I looked at your code again and you should change equals to contains in line 53) and make sure you have a file with that letter in that path, like abc.txt in your SecretFolder (fill it with some content so it has a size > 0)

searchFileVisitor.setPartOfName("b");
Files.walkFileTree(Paths.get("D:/SecretFolder"), searchFileVisitor);

when looking at your code I assume it always returns a list with size 0

Lisa L

Level 47 , Nuremberg, Germany

20 March 2022, 08:15

You also should stop checking the conditions if one fails. Like

if (partOfName != null && !file.getFileName().toString().contains(partOfName))
    return FileVisitResult.CONTINUE;

If you eg search for a file test.txt and the current file the code looks at is amigo.txt then my version will leave the method and continue with the next file in the directory. Your code will read the file content and check each line if there is a match with partOfContent. And finally your code will check the size. So mine could already be finished while yours is still reading the first file. another hint: the parameter BasicFileAttributes attrs contains some basic file attributes (as the name suggests ;) ) like file size, attrs.size();