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package bjc.utils.funcutils;
import java.io.IOException;
import java.nio.file.FileVisitResult;
import java.nio.file.Path;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.function.BiPredicate;
/**
* Functional implementation of a file visitor.
*
* @author Ben Culkin
*/
final class FunctionalFileVisitor extends SimpleFileVisitor<Path> {
/* Our predicate to pick files. */
private final BiPredicate<Path, BasicFileAttributes> predicate;
/* Our action to aply to files. */
private final BiPredicate<Path, BasicFileAttributes> action;
/**
* Create a new file visitor, powered by functions.
*
* @param predicate
* The predicate to use to pick which files to traverse.
*
* @param action
* The function to execute on every file.
*/
public FunctionalFileVisitor(final BiPredicate<Path, BasicFileAttributes> predicate,
final BiPredicate<Path, BasicFileAttributes> action) {
this.predicate = predicate;
this.action = action;
}
@Override
public FileVisitResult preVisitDirectory(final Path dir, final BasicFileAttributes attrs) throws IOException {
if(predicate.test(dir, attrs)) return FileVisitResult.CONTINUE;
return FileVisitResult.SKIP_SUBTREE;
}
@Override
public FileVisitResult visitFile(final Path file, final BasicFileAttributes attrs) throws IOException {
if(action.test(file, attrs)) return FileVisitResult.CONTINUE;
return FileVisitResult.TERMINATE;
}
}
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