22-04-11-비지터패턴-4부-자바와스프링에서찾아보는패턴

package me.whiteship.designpatterns._03_behavioral_patterns._23_visitor._03_java;

import me.whiteship.designpatterns._03_behavioral_patterns._23_visitor._02_after.Triangle;

import java.io.IOException;
import java.nio.file.*;
import java.nio.file.attribute.BasicFileAttributes;

public class SearchFileVisitor implements FileVisitor<Path> {

    private String fileToSearch;
    private Path startingDirectory;

    public SearchFileVisitor(String fileToSearch, Path startingDirectory) {
        this.fileToSearch = fileToSearch;
        this.startingDirectory = startingDirectory;
    }

    @Override
    public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) throws IOException {
        return FileVisitResult.CONTINUE;
    }

    @Override
    public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
        if (fileToSearch.equals(file.getFileName().toString())) {
            System.out.println("found " + file.getFileName());
            return FileVisitResult.TERMINATE;
        }
        return FileVisitResult.CONTINUE;
    }

    @Override
    public FileVisitResult visitFileFailed(Path file, IOException exc) throws IOException {
        exc.printStackTrace(System.out);
        return FileVisitResult.CONTINUE;
    }

    @Override
    public FileVisitResult postVisitDirectory(Path dir, IOException exc) throws IOException {
        if (Files.isSameFile(startingDirectory, dir)) {
            System.out.println("search end");
            return FileVisitResult.TERMINATE;
        }
        return FileVisitResult.CONTINUE;
    }
}

package me.whiteship.designpatterns._03_behavioral_patterns._23_visitor._03_java;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;

public class VisitorInJava {

    public static void main(String[] args) throws IOException {
        Path startingDirectory = Path.of("/Users/keesun/workspace/design-patterns");
        SearchFileVisitor searchFileVisitor =
                new SearchFileVisitor("Triangle.java", startingDirectory);
        Files.walkFileTree(startingDirectory, searchFileVisitor);
    }
}