OnJava8-Examples/onjava/ProcessFiles.java at master · BruceEckel/OnJava8-Examples · GitHub

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// onjava/ProcessFiles.java

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

package onjava;

import java.io.*;

import java.nio.file.*;

public class ProcessFiles {

public interface Strategy {

void process(File file);

}

private Strategy strategy;

private String ext;

public ProcessFiles(Strategy strategy, String ext) {

this.strategy = strategy;

this.ext = ext;

}

public void start(String[] args) {

try {

if(args.length == 0)

processDirectoryTree(new File("."));

else

for(String arg : args) {

File fileArg = new File(arg);

if(fileArg.isDirectory())

processDirectoryTree(fileArg);

else {

// Allow user to leave off extension:

if(!arg.endsWith("." + ext))

arg += "." + ext;

strategy.process(

new File(arg).getCanonicalFile());

}

} catch(IOException e) {

throw new RuntimeException(e);

}

public void

processDirectoryTree(File root) throws IOException {

PathMatcher matcher = FileSystems.getDefault()

.getPathMatcher("glob:**/*.{" + ext + "}");

Files.walk(root.toPath())

.filter(matcher::matches)

.forEach(p -> strategy.process(p.toFile()));

}

OnJava8-Examples/onjava/ProcessFiles.java at master · BruceEckel/OnJava8-Examples · GitHub

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