Add a DiffFormatter which calculates a patch-id

Adds a class which can be used to calculates a SHA1 of the diff
associated with a patch, similar to git patch-id.

In this version whitespace is not ignored.

Change-Id: I421d15ea905e23df543082786786841cbe3ef10d
Signed-off-by: Stefan Lay <stefan.lay@sap.com>
Signed-off-by: Chris Aniszczyk <caniszczyk@gmail.com>

1 files changed, 120 insertions, 0 deletions

diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/diff/PatchIdDiffFormatterTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/diff/PatchIdDiffFormatterTest.java
new file mode 100644
index 0000000000..00546a5aa4
--- /dev/null
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/diff/PatchIdDiffFormatterTest.java
@@ -0,0 +1,120 @@
+/*
+ * Copyright (C) 2011, Stefan Lay <stefan.lay@.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.diff;
+
+import static org.junit.Assert.assertEquals;
+
+import java.io.File;
+
+import org.eclipse.jgit.api.Git;
+import org.eclipse.jgit.dircache.DirCacheIterator;
+import org.eclipse.jgit.lib.RepositoryTestCase;
+import org.eclipse.jgit.treewalk.FileTreeIterator;
+import org.eclipse.jgit.treewalk.filter.PathFilter;
+import org.junit.Test;
+
+public class PatchIdDiffFormatterTest extends RepositoryTestCase {
+
+	@Test
+	public void testDiff() throws Exception {
+		write(new File(db.getDirectory().getParent(), "test.txt"), "test");
+		File folder = new File(db.getDirectory().getParent(), "folder");
+		folder.mkdir();
+		write(new File(folder, "folder.txt"), "folder");
+		Git git = new Git(db);
+		git.add().addFilepattern(".").call();
+		git.commit().setMessage("Initial commit").call();
+		write(new File(folder, "folder.txt"), "folder change");
+
+		PatchIdDiffFormatter df = new PatchIdDiffFormatter();
+		df.setRepository(db);
+		df.setPathFilter(PathFilter.create("folder"));
+		DirCacheIterator oldTree = new DirCacheIterator(db.readDirCache());
+		FileTreeIterator newTree = new FileTreeIterator(db);
+		df.format(oldTree, newTree);
+		df.flush();
+
+		assertEquals("1ff64e0f9333e9b81967c3e8d7a81362b14d5441", df
+				.getCalulatedPatchId().name());
+	}
+
+	@Test
+	public void testSameDiff() throws Exception {
+		write(new File(db.getDirectory().getParent(), "test.txt"), "test");
+		File folder = new File(db.getDirectory().getParent(), "folder");
+		folder.mkdir();
+		write(new File(folder, "folder.txt"), "\n\n\n\nfolder");
+		Git git = new Git(db);
+		git.add().addFilepattern(".").call();
+		git.commit().setMessage("Initial commit").call();
+		write(new File(folder, "folder.txt"), "\n\n\n\nfolder change");
+
+		PatchIdDiffFormatter df = new PatchIdDiffFormatter();
+		df.setRepository(db);
+		df.setPathFilter(PathFilter.create("folder"));
+		DirCacheIterator oldTree = new DirCacheIterator(db.readDirCache());
+		FileTreeIterator newTree = new FileTreeIterator(db);
+		df.format(oldTree, newTree);
+		df.flush();
+
+		assertEquals("08fca5ac531383eb1da8bf6b6f7cf44411281407", df
+				.getCalulatedPatchId().name());
+
+		write(new File(folder, "folder.txt"), "a\n\n\n\nfolder");
+		git.add().addFilepattern(".").call();
+		git.commit().setMessage("Initial commit").call();
+		write(new File(folder, "folder.txt"), "a\n\n\n\nfolder change");
+
+		df = new PatchIdDiffFormatter();
+		df.setRepository(db);
+		df.setPathFilter(PathFilter.create("folder"));
+		oldTree = new DirCacheIterator(db.readDirCache());
+		newTree = new FileTreeIterator(db);
+		df.format(oldTree, newTree);
+		df.flush();
+
+		assertEquals("08fca5ac531383eb1da8bf6b6f7cf44411281407", df
+				.getCalulatedPatchId().name());
+	}
+
+}