Parse RevCommit bodies before calling RevFilter.include()

RevFilter.include()'s documentation promises the RevCommit's
body is parsed before include is invoked.  This wasn't always
true if the commit was parsed once, had its body discarded,
the RevWalk was reset() and started a new traversal.

Change-Id: Ie5cafde09ae870712b165d8a97a2c9daf90b1dbd
Signed-off-by: Chris Aniszczyk <caniszczyk@gmail.com>

org.eclipse.jgit.test/tst/org/eclipse/jgit/revwalk/RevWalkResetTest.java

@@ -0,0 +1,117 @@
+/*
+ * Copyright (C) 2011, Garmin International
+ * Copyright (C) 2011, Jesse Greenwald <jesse.greenwald@gmail.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.revwalk;
+
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
+
+import java.io.IOException;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+import org.eclipse.jgit.errors.IncorrectObjectTypeException;
+import org.eclipse.jgit.errors.MissingObjectException;
+import org.eclipse.jgit.errors.StopWalkException;
+import org.eclipse.jgit.revwalk.filter.RevFilter;
+import org.junit.Test;
+
+public class RevWalkResetTest extends RevWalkTestCase {
+
+	@Test
+	public void testRevFilterReceivesParsedCommits() throws Exception {
+		final RevCommit a = commit();
+		final RevCommit b = commit(a);
+		final RevCommit c = commit(b);
+
+		final AtomicBoolean filterRan = new AtomicBoolean();
+		RevFilter testFilter = new RevFilter() {
+
+			@Override
+			public boolean include(RevWalk walker, RevCommit cmit)
+					throws StopWalkException, MissingObjectException,
+					IncorrectObjectTypeException, IOException {
+				assertNotNull("commit is parsed", cmit.getRawBuffer());
+				filterRan.set(true);
+				return true;
+			}
+
+			@Override
+			public RevFilter clone() {
+				return this;
+			}
+
+		};
+
+		// Do an initial run through the walk
+		filterRan.set(false);
+		rw.setRevFilter(testFilter);
+		markStart(c);
+		rw.markUninteresting(b);
+		for (RevCommit cmit = rw.next(); cmit != null; cmit = rw.next()) {
+			// Don't dispose the body here, because we want to test the effect
+			// of marking 'b' as uninteresting.
+		}
+		assertTrue("filter ran", filterRan.get());
+
+		// Run through the walk again, this time disposing of all commits.
+		filterRan.set(false);
+		rw.reset();
+		markStart(c);
+		for (RevCommit cmit = rw.next(); cmit != null; cmit = rw.next()) {
+			cmit.disposeBody();
+		}
+		assertTrue("filter ran", filterRan.get());
+
+		// Do the third run through the reused walk. Test that the explicitly
+		// disposed commits are parsed on this walk.
+		filterRan.set(false);
+		rw.reset();
+		markStart(c);
+		for (RevCommit cmit = rw.next(); cmit != null; cmit = rw.next()) {
+			// spin through the walk.
+		}
+		assertTrue("filter ran", filterRan.get());
+
+	}
+}

org.eclipse.jgit/src/org/eclipse/jgit/revwalk/PendingGenerator.java

@@ -137,8 +137,10 @@ class PendingGenerator extends Generator {
 				final boolean produce;
 				if ((c.flags & UNINTERESTING) != 0)
 					produce = false;
-				else
+				else {
+					c.parseBody(walker);
 					produce = filter.include(walker, c);
+				}
 
 				for (final RevCommit p : c.parents) {
 					if ((p.flags & SEEN) != 0)