--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/share/classes/java/nio/file/FileTreeIterator.java Thu May 09 14:44:56 2013 -0700
@@ -0,0 +1,124 @@
+/*
+ * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation. Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package java.nio.file;
+
+import java.io.Closeable;
+import java.io.IOException;
+import java.io.UncheckedIOException;
+import java.util.Arrays;
+import java.util.Iterator;
+import java.util.NoSuchElementException;
+import java.util.Objects;
+import java.nio.file.FileTreeWalker.Event;
+
+/**
+ * An {@code Iterator to iterate over the nodes of a file tree.
+ *
+ * <pre>{@code
+ * try (FileTreeIterator iterator = new FileTreeIterator(start, maxDepth, options)) {
+ * while (iterator.hasNext()) {
+ * Event ev = iterator.next();
+ * Path path = ev.file();
+ * BasicFileAttributes attrs = ev.attributes();
+ * }
+ * }
+ * }</pre>
+ */
+
+class FileTreeIterator implements Iterator<Event>, Closeable {
+ private final FileTreeWalker walker;
+ private Event next;
+
+ /**
+ * Creates a new iterator to walk the file tree starting at the given file.
+ *
+ * @throws IllegalArgumentException
+ * if {@code maxDepth} is negative
+ * @throws IOException
+ * if an I/O errors occurs opening the starting file
+ * @throws SecurityException
+ * if the security manager denies access to the starting file
+ * @throws NullPointerException
+ * if {@code start} or {@code options} is {@ocde null} or
+ * the options array contains a {@code null} element
+ */
+ FileTreeIterator(Path start, int maxDepth, FileVisitOption... options)
+ throws IOException
+ {
+ this.walker = new FileTreeWalker(Arrays.asList(options), maxDepth);
+ this.next = walker.walk(start);
+ assert next.type() == FileTreeWalker.EventType.ENTRY ||
+ next.type() == FileTreeWalker.EventType.START_DIRECTORY;
+
+ // IOException if there a problem accessing the starting file
+ IOException ioe = next.ioeException();
+ if (ioe != null)
+ throw ioe;
+ }
+
+ private void fetchNextIfNeeded() {
+ if (next == null) {
+ FileTreeWalker.Event ev = walker.next();
+ while (ev != null) {
+ IOException ioe = ev.ioeException();
+ if (ioe != null)
+ throw new UncheckedIOException(ioe);
+
+ // END_DIRECTORY events are ignored
+ if (ev.type() != FileTreeWalker.EventType.END_DIRECTORY) {
+ next = ev;
+ return;
+ }
+ ev = walker.next();
+ }
+ }
+ }
+
+ @Override
+ public boolean hasNext() {
+ if (!walker.isOpen())
+ throw new IllegalStateException();
+ fetchNextIfNeeded();
+ return next != null;
+ }
+
+ @Override
+ public Event next() {
+ if (!walker.isOpen())
+ throw new IllegalStateException();
+ fetchNextIfNeeded();
+ if (next == null)
+ throw new NoSuchElementException();
+ Event result = next;
+ next = null;
+ return result;
+ }
+
+ @Override
+ public void close() {
+ walker.close();
+ }
+}