package org.eclipse.jgit.api;
import static org.eclipse.jgit.treewalk.TreeWalk.OperationType.CHECKOUT_OP;
import java.io.IOException;
import java.text.MessageFormat;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.eclipse.jgit.api.errors.GitAPIException;
import org.eclipse.jgit.api.errors.InvalidRefNameException;
import org.eclipse.jgit.api.errors.JGitInternalException;
import org.eclipse.jgit.api.errors.NoHeadException;
import org.eclipse.jgit.api.errors.StashApplyFailureException;
import org.eclipse.jgit.api.errors.WrongRepositoryStateException;
import org.eclipse.jgit.dircache.DirCache;
import org.eclipse.jgit.dircache.DirCacheBuilder;
import org.eclipse.jgit.dircache.DirCacheCheckout;
import org.eclipse.jgit.dircache.DirCacheCheckout.CheckoutMetadata;
import org.eclipse.jgit.dircache.DirCacheEntry;
import org.eclipse.jgit.dircache.DirCacheIterator;
import org.eclipse.jgit.errors.CheckoutConflictException;
import org.eclipse.jgit.events.WorkingTreeModifiedEvent;
import org.eclipse.jgit.internal.JGitText;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.CoreConfig.EolStreamType;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.ObjectReader;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.lib.RepositoryState;
import org.eclipse.jgit.merge.MergeStrategy;
import org.eclipse.jgit.merge.ResolveMerger;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevTree;
import org.eclipse.jgit.revwalk.RevWalk;
import org.eclipse.jgit.treewalk.AbstractTreeIterator;
import org.eclipse.jgit.treewalk.FileTreeIterator;
import org.eclipse.jgit.treewalk.TreeWalk;
public class StashApplyCommand extends GitCommand<ObjectId> {
private static final String DEFAULT_REF = Constants.STASH + "@{0}";
private String stashRef;
private boolean restoreIndex = true;
private boolean restoreUntracked = true;
private boolean ignoreRepositoryState;
private MergeStrategy strategy = MergeStrategy.RECURSIVE;
public StashApplyCommand(Repository repo) {
super(repo);
}
public StashApplyCommand setStashRef(String stashRef) {
this.stashRef = stashRef;
return this;
}
public StashApplyCommand ignoreRepositoryState(boolean willIgnoreRepositoryState) {
this.ignoreRepositoryState = willIgnoreRepositoryState;
return this;
}
private ObjectId getStashId() throws GitAPIException {
final String revision = stashRef != null ? stashRef : DEFAULT_REF;
final ObjectId stashId;
try {
stashId = repo.resolve(revision);
} catch (IOException e) {
throw new InvalidRefNameException(MessageFormat.format(
JGitText.get().stashResolveFailed, revision), e);
}
if (stashId == null)
throw new InvalidRefNameException(MessageFormat.format(
JGitText.get().stashResolveFailed, revision));
return stashId;
}
@Override
public ObjectId call() throws GitAPIException,
WrongRepositoryStateException, NoHeadException,
StashApplyFailureException {
checkCallable();
if (!ignoreRepositoryState
&& repo.getRepositoryState() != RepositoryState.SAFE)
throw new WrongRepositoryStateException(MessageFormat.format(
JGitText.get().stashApplyOnUnsafeRepository,
repo.getRepositoryState()));
try (ObjectReader reader = repo.newObjectReader();
RevWalk revWalk = new RevWalk(reader)) {
ObjectId headCommit = repo.resolve(Constants.HEAD);
if (headCommit == null)
throw new NoHeadException(JGitText.get().stashApplyWithoutHead);
final ObjectId stashId = getStashId();
RevCommit stashCommit = revWalk.parseCommit(stashId);
if (stashCommit.getParentCount() < 2
|| stashCommit.getParentCount() > 3)
throw new JGitInternalException(MessageFormat.format(
JGitText.get().stashCommitIncorrectNumberOfParents,
stashId.name(),
Integer.valueOf(stashCommit.getParentCount())));
ObjectId headTree = repo.resolve(Constants.HEAD + "^{tree}");
ObjectId stashIndexCommit = revWalk.parseCommit(stashCommit
.getParent(1));
ObjectId stashHeadCommit = stashCommit.getParent(0);
ObjectId untrackedCommit = null;
if (restoreUntracked && stashCommit.getParentCount() == 3)
untrackedCommit = revWalk.parseCommit(stashCommit.getParent(2));
ResolveMerger merger = (ResolveMerger) strategy.newMerger(repo);
merger.setCommitNames(new String[] { "stashed HEAD", "HEAD",
"stash" });
merger.setBase(stashHeadCommit);
merger.setWorkingTreeIterator(new FileTreeIterator(repo));
boolean mergeSucceeded = merger.merge(headCommit, stashCommit);
List<String> modifiedByMerge = merger.getModifiedFiles();
if (!modifiedByMerge.isEmpty()) {
repo.fireEvent(
new WorkingTreeModifiedEvent(modifiedByMerge, null));
}
if (mergeSucceeded) {
DirCache dc = repo.lockDirCache();
DirCacheCheckout dco = new DirCacheCheckout(repo, headTree,
dc, merger.getResultTreeId());
dco.setFailOnConflict(true);
dco.checkout();
if (restoreIndex) {
ResolveMerger ixMerger = (ResolveMerger) strategy
.newMerger(repo, true);
ixMerger.setCommitNames(new String[] { "stashed HEAD",
"HEAD", "stashed index" });
ixMerger.setBase(stashHeadCommit);
boolean ok = ixMerger.merge(headCommit, stashIndexCommit);
if (ok) {
resetIndex(revWalk
.parseTree(ixMerger.getResultTreeId()));
} else {
throw new StashApplyFailureException(
JGitText.get().stashApplyConflict);
}
}
if (untrackedCommit != null) {
ResolveMerger untrackedMerger = (ResolveMerger) strategy
.newMerger(repo, true);
untrackedMerger.setCommitNames(new String[] {
"null", "HEAD", "untracked files" });
untrackedMerger.setBase(null);
boolean ok = untrackedMerger.merge(headCommit,
untrackedCommit);
if (ok) {
try {
RevTree untrackedTree = revWalk
.parseTree(untrackedCommit);
resetUntracked(untrackedTree);
} catch (CheckoutConflictException e) {
throw new StashApplyFailureException(
JGitText.get().stashApplyConflict, e);
}
} else {
throw new StashApplyFailureException(
JGitText.get().stashApplyConflict);
}
}
} else {
throw new StashApplyFailureException(
JGitText.get().stashApplyConflict);
}
return stashId;
} catch (JGitInternalException e) {
throw e;
} catch (IOException e) {
throw new JGitInternalException(JGitText.get().stashApplyFailed, e);
}
}
@Deprecated
public void setApplyIndex(boolean applyIndex) {
this.restoreIndex = applyIndex;
}
public StashApplyCommand setRestoreIndex(boolean restoreIndex) {
this.restoreIndex = restoreIndex;
return this;
}
public StashApplyCommand setStrategy(MergeStrategy strategy) {
this.strategy = strategy;
return this;
}
@Deprecated
public void setApplyUntracked(boolean applyUntracked) {
this.restoreUntracked = applyUntracked;
}
public StashApplyCommand setRestoreUntracked(boolean restoreUntracked) {
this.restoreUntracked = restoreUntracked;
return this;
}
private void resetIndex(RevTree tree) throws IOException {
DirCache dc = repo.lockDirCache();
try (TreeWalk walk = new TreeWalk(repo)) {
DirCacheBuilder builder = dc.builder();
walk.addTree(tree);
walk.addTree(new DirCacheIterator(dc));
walk.setRecursive(true);
while (walk.next()) {
AbstractTreeIterator cIter = walk.getTree(0,
AbstractTreeIterator.class);
if (cIter == null) {
continue;
}
final DirCacheEntry entry = new DirCacheEntry(walk.getRawPath());
entry.setFileMode(cIter.getEntryFileMode());
entry.setObjectIdFromRaw(cIter.idBuffer(), cIter.idOffset());
DirCacheIterator dcIter = walk.getTree(1,
DirCacheIterator.class);
if (dcIter != null && dcIter.idEqual(cIter)) {
DirCacheEntry indexEntry = dcIter.getDirCacheEntry();
entry.setLastModified(indexEntry.getLastModifiedInstant());
entry.setLength(indexEntry.getLength());
}
builder.add(entry);
}
builder.commit();
} finally {
dc.unlock();
}
}
private void resetUntracked(RevTree tree) throws CheckoutConflictException,
IOException {
Set<String> actuallyModifiedPaths = new HashSet<>();
try (TreeWalk walk = new TreeWalk(repo)) {
walk.addTree(tree);
walk.addTree(new FileTreeIterator(repo));
walk.setRecursive(true);
final ObjectReader reader = walk.getObjectReader();
while (walk.next()) {
final AbstractTreeIterator cIter = walk.getTree(0,
AbstractTreeIterator.class);
if (cIter == null)
continue;
final EolStreamType eolStreamType = walk
.getEolStreamType(CHECKOUT_OP);
final DirCacheEntry entry = new DirCacheEntry(walk.getRawPath());
entry.setFileMode(cIter.getEntryFileMode());
entry.setObjectIdFromRaw(cIter.idBuffer(), cIter.idOffset());
FileTreeIterator fIter = walk
.getTree(1, FileTreeIterator.class);
if (fIter != null) {
if (fIter.isModified(entry, true, reader)) {
throw new CheckoutConflictException(
entry.getPathString());
}
}
checkoutPath(entry, reader,
new CheckoutMetadata(eolStreamType, null));
actuallyModifiedPaths.add(entry.getPathString());
}
} finally {
if (!actuallyModifiedPaths.isEmpty()) {
repo.fireEvent(new WorkingTreeModifiedEvent(
actuallyModifiedPaths, null));
}
}
}
private void checkoutPath(DirCacheEntry entry, ObjectReader reader,
CheckoutMetadata checkoutMetadata) {
try {
DirCacheCheckout.checkoutEntry(repo, entry, reader, true,
checkoutMetadata);
} catch (IOException e) {
throw new JGitInternalException(MessageFormat.format(
JGitText.get().checkoutConflictWithFile,
entry.getPathString()), e);
}
}
}