79 lines
2.1 KiB
Java
79 lines
2.1 KiB
Java
// onjava/ProcessFiles.java
|
|
// (c)2017 MindView LLC: see Copyright.txt
|
|
// We make no guarantees that this code is fit for any purpose.
|
|
// Visit http://OnJava8.com for more book information.
|
|
// {ValidateByHand} // main() won't run on Travis CI
|
|
// {java onjava.ProcessFiles}
|
|
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()));
|
|
}
|
|
// Demonstration of how to use it:
|
|
public static void main(String[] args) {
|
|
new ProcessFiles(file -> System.out.println(file),
|
|
"java").start(args);
|
|
}
|
|
}
|
|
/* Output: (First and Last 10 Lines)
|
|
.\ArrayShow.java
|
|
.\atunit\AtUnit.java
|
|
.\atunit\ClassNameFinder.java
|
|
.\atunit\Test.java
|
|
.\atunit\TestObjectCleanup.java
|
|
.\atunit\TestObjectCreate.java
|
|
.\atunit\TestProperty.java
|
|
.\BasicSupplier.java
|
|
.\CollectionMethodDifferences.java
|
|
.\ConvertTo.java
|
|
...________...________...________...________...
|
|
.\Stack.java
|
|
.\Suppliers.java
|
|
.\TimedAbort.java
|
|
.\Timer.java
|
|
.\Tuple.java
|
|
.\Tuple2.java
|
|
.\Tuple3.java
|
|
.\Tuple4.java
|
|
.\Tuple5.java
|
|
.\TypeCounter.java
|
|
*/
|