Extend the FS class for Java7

The most important difference is that in Java7 we have symbolic links
and for most operations in the work tree we want to operate on the link
itself rather than the link target, which the old File methods generally
do.

We also add support for the hidden attribute, which only makes sense
on Windows and exists, just since there are claims that Files.exists
is faster the File.exists.

A new bundle is only activated when run with a Java7 execution
environment. It is implemented as a fragment.

Tycho currently has no way to conditionally include optional features
based on the java version used to run the build, this means with this
change the jgit packaging build always needs to be run using java 7.

Change-Id: I3d6580d6fa7b22f60d7e54ab236898ed44954ffd
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

1 files changed, 115 insertions, 0 deletions

diff --git a/org.eclipse.jgit.java7.test/src/org/eclipse/jgit/util/FSJava7Test.java b/org.eclipse.jgit.java7.test/src/org/eclipse/jgit/util/FSJava7Test.java
new file mode 100644
index 0000000000..d735bd3ce5
--- /dev/null
+++ b/org.eclipse.jgit.java7.test/src/org/eclipse/jgit/util/FSJava7Test.java
@@ -0,0 +1,115 @@
+/*
+ * Copyright (C) 2012-2013, Robin Rosenberg <robin.rosenberg@dewire.com>
+ * and other copyright owners as documented in the project's IP log.
+ *
+ * This program and the accompanying materials are made available
+ * under the terms of the Eclipse Distribution License v1.0 which
+ * accompanies this distribution, is reproduced below, and is
+ * available at http://www.eclipse.org/org/documents/edl-v10.php
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ *   copyright notice, this list of conditions and the following
+ *   disclaimer in the documentation and/or other materials provided
+ *   with the distribution.
+ *
+ * - Neither the name of the Eclipse Foundation, Inc. nor the
+ *   names of its contributors may be used to endorse or promote
+ *   products derived from this software without specific prior
+ *   written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+ * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package org.eclipse.jgit.util;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+import java.io.File;
+import java.io.IOException;
+
+import org.eclipse.jgit.junit.RepositoryTestCase;
+import org.eclipse.jgit.util.FS;
+import org.eclipse.jgit.util.FileUtils;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+public class FSJava7Test {
+
+	private final File trash = new File(new File("target"), "trash");
+
+	@Before
+	public void setUp() throws Exception {
+		FileUtils.delete(trash, FileUtils.RECURSIVE | FileUtils.RETRY | FileUtils.SKIP_MISSING);
+		assertTrue(trash.mkdirs());
+	}
+
+	@After
+	public void tearDown() throws Exception {
+		FileUtils.delete(trash, FileUtils.RECURSIVE | FileUtils.RETRY);
+	}
+
+	/**
+	 * The old File methods traverse symbolic links and look at the targets.
+	 * With symbolic links we usually want to modify/look at the link. For some
+	 * reason the executable attribute seems to always look at the target, but
+	 * for the other attributes like lastModified, hidden and exists we must
+	 * differ between the link and the target.
+	 *
+	 * @throws IOException
+	 * @throws InterruptedException
+	 */
+	@Test
+	public void testSymlinkAttributes() throws IOException, InterruptedException {
+		FS fs = FS.DETECTED;
+		File link = new File(trash, "x");
+		File target = new File(trash, "y");
+		fs.createSymLink(link, "y");
+		assertTrue(fs.exists(link));
+		String targetName = fs.readSymLink(link);
+		assertEquals("y", targetName);
+		assertTrue(fs.lastModified(link) > 0);
+		assertTrue(fs.exists(link));
+		assertFalse(fs.canExecute(link));
+		assertEquals(1, fs.length(link));
+		assertFalse(fs.exists(target));
+		assertFalse(fs.isFile(target));
+		assertFalse(fs.isDirectory(target));
+		assertFalse(fs.canExecute(target));
+
+		RepositoryTestCase.fsTick(link);
+		// Now create the link target
+		FileUtils.createNewFile(target);
+		assertTrue(fs.exists(link));
+		assertTrue(fs.lastModified(link) > 0);
+		assertTrue(fs.lastModified(target) > fs.lastModified(link));
+		assertFalse(fs.canExecute(link));
+		fs.setExecute(target, true);
+		assertFalse(fs.canExecute(link));
+		assertTrue(fs.canExecute(target));
+	}
+
+}