Massive package refactoring

[lgpl/argeo-commons.git] / org.argeo.cms / src / org / argeo / cms / util / FsUtils.java

diff --git a/org.argeo.cms/src/org/argeo/cms/util/FsUtils.java b/org.argeo.cms/src/org/argeo/cms/util/FsUtils.java
new file mode 100644 (file)
index 0000000..26c05b6
--- /dev/null
+++ b/org.argeo.cms/src/org/argeo/cms/util/FsUtils.java
@@ -0,0 +1,78 @@
+package org.argeo.cms.util;
+
+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;
+
+/** Utilities around the standard Java file abstractions. */
+public class FsUtils {
+
+       /** Deletes this path, recursively if needed. */
+       public static void copyDirectory(Path source, Path target) {
+               if (!Files.exists(source) || !Files.isDirectory(source))
+                       throw new IllegalArgumentException(source + " is not a directory");
+               if (Files.exists(target) && !Files.isDirectory(target))
+                       throw new IllegalArgumentException(target + " is not a directory");
+               try {
+                       Files.createDirectories(target);
+                       Files.walkFileTree(source, new SimpleFileVisitor<Path>() {
+
+                               @Override
+                               public FileVisitResult preVisitDirectory(Path directory, BasicFileAttributes attrs) throws IOException {
+                                       Path relativePath = source.relativize(directory);
+                                       Path targetDirectory = target.resolve(relativePath);
+                                       if (!Files.exists(targetDirectory))
+                                               Files.createDirectory(targetDirectory);
+                                       return FileVisitResult.CONTINUE;
+                               }
+
+                               @Override
+                               public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
+                                       Path relativePath = source.relativize(file);
+                                       Path targetFile = target.resolve(relativePath);
+                                       Files.copy(file, targetFile);
+                                       return FileVisitResult.CONTINUE;
+                               }
+                       });
+               } catch (IOException e) {
+                       throw new RuntimeException("Cannot copy " + source + " to " + target, e);
+               }
+
+       }
+
+       /**
+        * Deletes this path, recursively if needed. Does nothing if the path does not
+        * exist.
+        */
+       public static void delete(Path path) {
+               try {
+                       if (!Files.exists(path))
+                               return;
+                       Files.walkFileTree(path, new SimpleFileVisitor<Path>() {
+                               @Override
+                               public FileVisitResult postVisitDirectory(Path directory, IOException e) throws IOException {
+                                       if (e != null)
+                                               throw e;
+                                       Files.delete(directory);
+                                       return FileVisitResult.CONTINUE;
+                               }
+
+                               @Override
+                               public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
+                                       Files.delete(file);
+                                       return FileVisitResult.CONTINUE;
+                               }
+                       });
+               } catch (IOException e) {
+                       throw new RuntimeException("Cannot delete " + path, e);
+               }
+       }
+
+       /** Singleton. */
+       private FsUtils() {
+       }
+
+}