Allow callers to use different merging strategies

Signed-off-by: Laurent Goubet <laurent.goubet@obeo.fr>
Change-Id: I84e9d7b4b772b4ad7d3e7010aad78291d4d178fe

org.eclipse.jgit/src/org/eclipse/jgit/api/CherryPickCommand.java

@@ -88,6 +88,8 @@ public class CherryPickCommand extends GitCommand<CherryPickResult> {
 
 	private String ourCommitName = null;
 
+	private MergeStrategy strategy = MergeStrategy.RECURSIVE;
+
 	/**
 	 * @param repo
 	 */
@@ -151,8 +153,7 @@ public class CherryPickCommand extends GitCommand<CherryPickResult> {
 				String cherryPickName = srcCommit.getId().abbreviate(7).name()
 						+ " " + srcCommit.getShortMessage(); //$NON-NLS-1$
 
-				ResolveMerger merger = (ResolveMerger) MergeStrategy.RECURSIVE
+				ResolveMerger merger = (ResolveMerger) strategy.newMerger(repo);
-						.newMerger(repo);
 				merger.setWorkingTreeIterator(new FileTreeIterator(repo));
 				merger.setBase(srcParent.getTree());
 				merger.setCommitNames(new String[] { "BASE", ourName,
@@ -259,6 +260,17 @@ public class CherryPickCommand extends GitCommand<CherryPickResult> {
 		return this;
 	}
 
+	/**
+	 * @param strategy
+	 *            The merge strategy to use during this Cherry-pick.
+	 * @return {@code this}
+	 * @since 3.4
+	 */
+	public CherryPickCommand setStrategy(MergeStrategy strategy) {
+		this.strategy = strategy;
+		return this;
+	}
+
 	private String calculateOurName(Ref headRef) {
 		if (ourCommitName != null)
 			return ourCommitName;

org.eclipse.jgit/src/org/eclipse/jgit/api/PullCommand.java

@@ -66,6 +66,7 @@ import org.eclipse.jgit.lib.ProgressMonitor;
 import org.eclipse.jgit.lib.Ref;
 import org.eclipse.jgit.lib.Repository;
 import org.eclipse.jgit.lib.RepositoryState;
+import org.eclipse.jgit.merge.MergeStrategy;
 import org.eclipse.jgit.transport.FetchResult;
 
 /**
@@ -86,6 +87,8 @@ public class PullCommand extends TransportCommand<PullCommand, PullResult> {
 
 	private String remoteBranchName;
 
+	private MergeStrategy strategy = MergeStrategy.RECURSIVE;
+
 	private enum PullRebaseMode {
 		USE_CONFIG,
 		REBASE,
@@ -299,13 +302,14 @@ public class PullCommand extends TransportCommand<PullCommand, PullResult> {
 		if (doRebase) {
 			RebaseCommand rebase = new RebaseCommand(repo);
 			RebaseResult rebaseRes = rebase.setUpstream(commitToMerge)
-					.setUpstreamName(upstreamName)
+					.setUpstreamName(upstreamName).setProgressMonitor(monitor)
-					.setProgressMonitor(monitor).setOperation(Operation.BEGIN)
+					.setOperation(Operation.BEGIN).setStrategy(strategy)
 					.call();
 			result = new PullResult(fetchRes, remote, rebaseRes);
 		} else {
 			MergeCommand merge = new MergeCommand(repo);
 			merge.include(upstreamName, commitToMerge);
+			merge.setStrategy(strategy);
 			MergeResult mergeRes = merge.call();
 			monitor.update(1);
 			result = new PullResult(fetchRes, remote, mergeRes);
@@ -363,4 +367,15 @@ public class PullCommand extends TransportCommand<PullCommand, PullResult> {
 	public String getRemoteBranchName() {
 		return remoteBranchName;
 	}
+
+	/**
+	 * @param strategy
+	 *            The merge strategy to use during this pull operation.
+	 * @return {@code this}
+	 * @since 3.4
+	 */
+	public PullCommand setStrategy(MergeStrategy strategy) {
+		this.strategy = strategy;
+		return this;
+	}
 }

org.eclipse.jgit/src/org/eclipse/jgit/api/RebaseCommand.java

@@ -93,6 +93,7 @@ import org.eclipse.jgit.lib.Ref;
 import org.eclipse.jgit.lib.RefUpdate;
 import org.eclipse.jgit.lib.RefUpdate.Result;
 import org.eclipse.jgit.lib.Repository;
+import org.eclipse.jgit.merge.MergeStrategy;
 import org.eclipse.jgit.revwalk.RevCommit;
 import org.eclipse.jgit.revwalk.RevWalk;
 import org.eclipse.jgit.treewalk.TreeWalk;
@@ -211,6 +212,8 @@ public class RebaseCommand extends GitCommand<RebaseResult> {
 
 	private boolean lastStepWasForward;
 
+	private MergeStrategy strategy = MergeStrategy.RECURSIVE;
+
 	/**
 	 * @param repo
 	 */
@@ -375,7 +378,8 @@ public class RebaseCommand extends GitCommand<RebaseResult> {
 			String stash = rebaseState.readFile(AUTOSTASH);
 			try {
 				Git.wrap(repo).stashApply().setStashRef(stash)
-						.ignoreRepositoryState(true).call();
+						.ignoreRepositoryState(true).setStrategy(strategy)
+						.call();
 			} catch (StashApplyFailureException e) {
 				conflicts = true;
 				RevWalk rw = new RevWalk(repo);
@@ -474,7 +478,7 @@ public class RebaseCommand extends GitCommand<RebaseResult> {
 				String ourCommitName = getOurCommitName();
 				CherryPickResult cherryPickResult = new Git(repo).cherryPick()
 						.include(commitToPick).setOurCommitName(ourCommitName)
-						.setReflogPrefix("rebase:").call(); //$NON-NLS-1$
+						.setReflogPrefix("rebase:").setStrategy(strategy).call(); //$NON-NLS-1$
 				switch (cherryPickResult.getStatus()) {
 				case FAILED:
 					if (operation == Operation.BEGIN)
@@ -1302,6 +1306,17 @@ public class RebaseCommand extends GitCommand<RebaseResult> {
 		return this;
 	}
 
+	/**
+	 * @param strategy
+	 *            The merge strategy to use during this rebase operation.
+	 * @return {@code this}
+	 * @since 3.4
+	 */
+	public RebaseCommand setStrategy(MergeStrategy strategy) {
+		this.strategy = strategy;
+		return this;
+	}
+
 	/**
 	 * Allows configure rebase interactive process and modify commit message
 	 */

org.eclipse.jgit/src/org/eclipse/jgit/api/RevertCommand.java

@@ -95,6 +95,8 @@ public class RevertCommand extends GitCommand<RevCommit> {
 
 	private List<String> unmergedPaths;
 
+	private MergeStrategy strategy = MergeStrategy.RECURSIVE;
+
 	/**
 	 * @param repo
 	 */
@@ -160,8 +162,7 @@ public class RevertCommand extends GitCommand<RevCommit> {
 				String revertName = srcCommit.getId().abbreviate(7).name()
 						+ " " + srcCommit.getShortMessage(); //$NON-NLS-1$
 
-				ResolveMerger merger = (ResolveMerger) MergeStrategy.RECURSIVE
+				ResolveMerger merger = (ResolveMerger) strategy.newMerger(repo);
-						.newMerger(repo);
 				merger.setWorkingTreeIterator(new FileTreeIterator(repo));
 				merger.setBase(srcCommit.getTree());
 				merger.setCommitNames(new String[] {
@@ -194,15 +195,14 @@ public class RevertCommand extends GitCommand<RevCommit> {
 								merger.getBaseCommitId(),
 								new ObjectId[] { headCommit.getId(),
 										srcParent.getId() },
-								MergeStatus.FAILED, MergeStrategy.RECURSIVE,
+								MergeStatus.FAILED, strategy,
 								merger.getMergeResults(), failingPaths, null);
 					else
 						failingResult = new MergeResult(null,
 								merger.getBaseCommitId(),
 								new ObjectId[] { headCommit.getId(),
 										srcParent.getId() },
-								MergeStatus.CONFLICTING,
+								MergeStatus.CONFLICTING, strategy,
-								MergeStrategy.RECURSIVE,
 								merger.getMergeResults(), failingPaths, null);
 					if (!merger.failed() && !unmergedPaths.isEmpty()) {
 						String message = new MergeMessageFormatter()
@@ -301,4 +301,15 @@ public class RevertCommand extends GitCommand<RevCommit> {
 	public List<String> getUnmergedPaths() {
 		return unmergedPaths;
 	}
+
+	/**
+	 * @param strategy
+	 *            The merge strategy to use during this revert command.
+	 * @return {@code this}
+	 * @since 3.4
+	 */
+	public RevertCommand setStrategy(MergeStrategy strategy) {
+		this.strategy = strategy;
+		return this;
+	}
 }

org.eclipse.jgit/src/org/eclipse/jgit/api/StashApplyCommand.java

@@ -92,6 +92,8 @@ public class StashApplyCommand extends GitCommand<ObjectId> {
 
 	private boolean ignoreRepositoryState;
 
+	private MergeStrategy strategy = MergeStrategy.RECURSIVE;
+
 	/**
 	 * Create command to apply the changes of a stashed commit
 	 *
@@ -181,8 +183,7 @@ public class StashApplyCommand extends GitCommand<ObjectId> {
 					.getParent(1));
 			ObjectId stashHeadCommit = stashCommit.getParent(0);
 
-			ResolveMerger merger = (ResolveMerger) MergeStrategy.RECURSIVE
+			ResolveMerger merger = (ResolveMerger) strategy.newMerger(repo);
-					.newMerger(repo);
 			merger.setCommitNames(new String[] { "stashed HEAD", "HEAD",
 					"stash" });
 			merger.setBase(stashHeadCommit);
@@ -194,7 +195,7 @@ public class StashApplyCommand extends GitCommand<ObjectId> {
 				dco.setFailOnConflict(true);
 				dco.checkout(); // Ignoring failed deletes....
 				if (applyIndex) {
-					ResolveMerger ixMerger = (ResolveMerger) MergeStrategy.RECURSIVE
+					ResolveMerger ixMerger = (ResolveMerger) strategy
 							.newMerger(repo, true);
 					ixMerger.setCommitNames(new String[] { "stashed HEAD",
 							"HEAD", "stashed index" });
@@ -231,6 +232,18 @@ public class StashApplyCommand extends GitCommand<ObjectId> {
 		this.applyIndex = applyIndex;
 	}
 
+	/**
+	 * @param strategy
+	 *            The merge strategy to use in order to merge during this
+	 *            command execution.
+	 * @return {@code this}
+	 * @since 3.4
+	 */
+	public StashApplyCommand setStrategy(MergeStrategy strategy) {
+		this.strategy = strategy;
+		return this;
+	}
+
 	private void resetIndex(RevTree tree) throws IOException {
 		DirCache dc = repo.lockDirCache();
 		TreeWalk walk = null;

org.eclipse.jgit/src/org/eclipse/jgit/api/SubmoduleUpdateCommand.java

@@ -65,6 +65,7 @@ import org.eclipse.jgit.lib.NullProgressMonitor;
 import org.eclipse.jgit.lib.ProgressMonitor;
 import org.eclipse.jgit.lib.RefUpdate;
 import org.eclipse.jgit.lib.Repository;
+import org.eclipse.jgit.merge.MergeStrategy;
 import org.eclipse.jgit.revwalk.RevCommit;
 import org.eclipse.jgit.revwalk.RevWalk;
 import org.eclipse.jgit.submodule.SubmoduleWalk;
@@ -84,6 +85,8 @@ public class SubmoduleUpdateCommand extends
 
 	private final Collection<String> paths;
 
+	private MergeStrategy strategy = MergeStrategy.RECURSIVE;
+
 	/**
 	 * @param repo
 	 */
@@ -174,10 +177,12 @@ public class SubmoduleUpdateCommand extends
 					if (ConfigConstants.CONFIG_KEY_MERGE.equals(update)) {
 						MergeCommand merge = new MergeCommand(submoduleRepo);
 						merge.include(commit);
+						merge.setStrategy(strategy);
 						merge.call();
 					} else if (ConfigConstants.CONFIG_KEY_REBASE.equals(update)) {
 						RebaseCommand rebase = new RebaseCommand(submoduleRepo);
 						rebase.setUpstream(commit);
+						rebase.setStrategy(strategy);
 						rebase.call();
 					} else {
 						// Checkout commit referenced in parent repository's
@@ -204,4 +209,15 @@ public class SubmoduleUpdateCommand extends
 			throw new InvalidConfigurationException(e.getMessage(), e);
 		}
 	}
+
+	/**
+	 * @param strategy
+	 *            The merge strategy to use during this update operation.
+	 * @return {@code this}
+	 * @since 3.4
+	 */
+	public SubmoduleUpdateCommand setStrategy(MergeStrategy strategy) {
+		this.strategy = strategy;
+		return this;
+	}
 }