Add builder-style API to jgit and Commit & Log cmd

Added a new package org.eclipse.jgit.api and a builder-style API for
jgit. Added also the first implementation for two git commands: Commit
and Log.

This API is intended to be used by external components when
functionalities of the standard git commands are required. It will also
help to ease writing JGit tests.

For internal usages this API may often not be optimal because the git
commands are doing much more than required or they expect parameters of
an unappropriate type.

Change-Id: I71ac4839ab9d2f848307eba9252090c586b4146b
Signed-off-by: Christian Halstrick <christian.halstrick@sap.com>

2 files changed, 118 insertions, 0 deletions

diff --git a/org.eclipse.jgit.test/META-INF/MANIFEST.MF b/org.eclipse.jgit.test/META-INF/MANIFEST.MF
index 8b44b60535..d5eccecb08 100644
--- a/org.eclipse.jgit.test/META-INF/MANIFEST.MF
+++ b/org.eclipse.jgit.test/META-INF/MANIFEST.MF
@@ -9,6 +9,7 @@ Bundle-ActivationPolicy: lazy
 Bundle-RequiredExecutionEnvironment: J2SE-1.5
 Import-Package: junit.framework;version="[3.8.2,4.0.0)",
  junit.textui;version="[3.8.2,4.0.0)",
+ org.eclipse.jgit.api;version="[0.8.0,0.9.0)",
  org.eclipse.jgit.diff;version="[0.8.0,0.9.0)",
  org.eclipse.jgit.dircache;version="[0.8.0,0.9.0)",
  org.eclipse.jgit.errors;version="[0.8.0,0.9.0)",
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/api/CommitAndLogCommandTests.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/api/CommitAndLogCommandTests.java
new file mode 100644
index 0000000000..d8fbb9578a
--- /dev/null
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/api/CommitAndLogCommandTests.java
@@ -0,0 +1,117 @@
+/*
+ * Copyright (C) 2010, Christian Halstrick <christian.halstrick@sap.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.api;
+
+import org.eclipse.jgit.errors.UnmergedPathException;
+import org.eclipse.jgit.lib.PersonIdent;
+import org.eclipse.jgit.lib.RepositoryTestCase;
+import org.eclipse.jgit.revwalk.RevCommit;
+
+public class CommitAndLogCommandTests extends RepositoryTestCase {
+	public void testSomeCommits() throws NoHeadException, NoMessageException,
+			UnmergedPathException, ConcurrentRefUpdateException {
+
+		// do 4 commits
+		Git git = new Git(db);
+		git.commit().setMessage("initial commit").call();
+		git.commit().setMessage("second commit").setCommitter(committer).call();
+		git.commit().setMessage("third commit").setAuthor(author).call();
+		git.commit().setMessage("fourth commit").setAuthor(author)
+				.setCommitter(committer).call();
+		Iterable<RevCommit> commits = git.log().call();
+
+		// check that all commits came in correctly
+		PersonIdent defaultCommitter = new PersonIdent(db);
+		PersonIdent expectedAuthors[] = new PersonIdent[] {
+				defaultCommitter, committer, author, author };
+		PersonIdent expectedCommitters[] = new PersonIdent[] {
+				defaultCommitter, committer, defaultCommitter, committer };
+		String expectedMessages[] = new String[] { "initial commit",
+				"second commit", "third commit", "fourth commit" };
+		int l = expectedAuthors.length - 1;
+		for (RevCommit c : commits) {
+			assertEquals(expectedAuthors[l].getName(), c.getAuthorIdent()
+					.getName());
+			assertEquals(expectedCommitters[l].getName(), c.getCommitterIdent()
+					.getName());
+			assertEquals(c.getFullMessage(), expectedMessages[l]);
+			l--;
+		}
+		assertEquals(l, -1);
+	}
+
+	// try to do a commit without specifying a message. Should fail!
+	public void testWrongParams() throws UnmergedPathException,
+			NoHeadException, ConcurrentRefUpdateException {
+		Git git = new Git(db);
+		try {
+			git.commit().setAuthor(author).call();
+			fail("Didn't get the expected exception");
+		} catch (NoMessageException e) {
+		}
+	}
+
+	// try to work with Commands after command has been invoked. Should throw
+	// exceptions
+	public void testMultipleInvocations() throws NoHeadException,
+			ConcurrentRefUpdateException, NoMessageException,
+			UnmergedPathException {
+		Git git = new Git(db);
+		CommitCommand commitCmd = git.commit();
+		commitCmd.setMessage("initial commit").call();
+		try {
+			// check that setters can't be called after invocation
+			commitCmd.setAuthor(author);
+			fail("didn't catch the expected exception");
+		} catch (IllegalStateException e) {
+		}
+		LogCommand logCmd = git.log();
+		logCmd.call();
+		try {
+			// check that call can't be called twice
+			logCmd.call();
+			fail("didn't catch the expected exception");
+		} catch (IllegalStateException e) {
+		}
+	}
+}