From 275a627719fc2231b16caea41130ff09f0f2b6a1 Mon Sep 17 00:00:00 2001
From: bculkin2442 <bjculkin@mix.wvu.edu>
Date: Fri, 8 Apr 2016 13:28:09 -0400
Subject: Switch functional data to use interfaces

---
 .../main/java/bjc/utils/funcutils/FileUtils.java   | 77 ++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 BJC-Utils2/src/main/java/bjc/utils/funcutils/FileUtils.java

(limited to 'BJC-Utils2/src/main/java/bjc/utils/funcutils/FileUtils.java')

diff --git a/BJC-Utils2/src/main/java/bjc/utils/funcutils/FileUtils.java b/BJC-Utils2/src/main/java/bjc/utils/funcutils/FileUtils.java
new file mode 100644
index 0000000..fd09fbb
--- /dev/null
+++ b/BJC-Utils2/src/main/java/bjc/utils/funcutils/FileUtils.java
@@ -0,0 +1,77 @@
+package bjc.utils.funcutils;
+
+import java.io.IOException;
+import java.nio.file.FileVisitResult;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.SimpleFileVisitor;
+import java.nio.file.attribute.BasicFileAttributes;
+import java.util.function.BiPredicate;
+
+/**
+ * Utilities for doing things with files
+ * 
+ * @author ben
+ *
+ */
+public class FileUtils {
+	private static final class FunctionalFileVisitor
+			extends SimpleFileVisitor<Path> {
+		private BiPredicate<Path, BasicFileAttributes>	traversalPredicate;
+		private BiPredicate<Path, BasicFileAttributes>	traversalAction;
+
+		public FunctionalFileVisitor(
+				BiPredicate<Path, BasicFileAttributes> traversalPredicate,
+				BiPredicate<Path, BasicFileAttributes> traversalAction) {
+			this.traversalPredicate = traversalPredicate;
+			this.traversalAction = traversalAction;
+		}
+
+		@Override
+		public FileVisitResult preVisitDirectory(Path dir,
+				BasicFileAttributes attrs) throws IOException {
+			if (traversalPredicate.test(dir, attrs)) {
+				return FileVisitResult.CONTINUE;
+			}
+
+			return FileVisitResult.SKIP_SUBTREE;
+		}
+
+		@Override
+		public FileVisitResult visitFile(Path file,
+				BasicFileAttributes attrs) throws IOException {
+			if (traversalAction.test(file, attrs)) {
+				return FileVisitResult.CONTINUE;
+			}
+
+			return FileVisitResult.TERMINATE;
+		}
+	}
+
+	/**
+	 * Traverse a directory recursively. This is a depth-first traversal
+	 * 
+	 * 
+	 * @param root
+	 *            The directory to start the traversal at
+	 * @param traversalPredicate
+	 *            The predicate to determine whether or not to traverse a
+	 *            directory
+	 * @param traversalAction
+	 *            The action to invoke upon each file in the directory.
+	 *            Returning true means to continue the traversal, returning
+	 *            false stops it
+	 * @throws IOException
+	 *             if the walk throws an exception
+	 * 
+	 *             TODO If it becomes necessary, write another overload for
+	 *             this with all the buttons and knobs from walkFileTree
+	 */
+	public static void traverseDirectory(Path root,
+			BiPredicate<Path, BasicFileAttributes> traversalPredicate,
+			BiPredicate<Path, BasicFileAttributes> traversalAction)
+			throws IOException {
+		Files.walkFileTree(root, new FunctionalFileVisitor(
+				traversalPredicate, traversalAction));
+	}
+}
-- 
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