Example usage for org.eclipse.jgit.lib Repository Repository

Introduction

In this page you can find the example usage for org.eclipse.jgit.lib Repository Repository.

Prototype

protected Repository(BaseRepositoryBuilder options) 

Source Link

Document

Initialize a new repository instance.

Usage

From source file:playRepository.GitRepository.java

License:Apache License

private static List<FileDiff> getFileDiffs(final Repository repositoryA, Repository repositoryB,
        ObjectId commitA, ObjectId commitB) throws IOException {
    class MultipleRepositoryObjectReader extends ObjectReader {
        Collection<ObjectReader> readers = new HashSet<>();

        @Override//from  w  w w.java 2  s.  com
        public ObjectReader newReader() {
            return new MultipleRepositoryObjectReader(readers);
        }

        public MultipleRepositoryObjectReader(Collection<ObjectReader> readers) {
            this.readers = readers;
        }

        public MultipleRepositoryObjectReader() {
            this.readers = new HashSet<>();
        }

        public void addObjectReader(ObjectReader reader) {
            this.readers.add(reader);
        }

        @Override
        public Collection<ObjectId> resolve(AbbreviatedObjectId id) throws IOException {
            Set<ObjectId> result = new HashSet<>();
            for (ObjectReader reader : readers) {
                result.addAll(reader.resolve(id));
            }
            return result;
        }

        @Override
        public ObjectLoader open(AnyObjectId objectId, int typeHint) throws IOException {
            for (ObjectReader reader : readers) {
                if (reader.has(objectId, typeHint)) {
                    return reader.open(objectId, typeHint);
                }
            }
            return null;
        }

        @Override
        public Set<ObjectId> getShallowCommits() throws IOException {
            Set<ObjectId> union = new HashSet<>();
            for (ObjectReader reader : readers) {
                union.addAll(reader.getShallowCommits());
            }
            return union;
        }
    }

    final MultipleRepositoryObjectReader reader = new MultipleRepositoryObjectReader();
    reader.addObjectReader(repositoryA.newObjectReader());
    reader.addObjectReader(repositoryB.newObjectReader());

    @SuppressWarnings("rawtypes")
    Repository fakeRepo = new Repository(new BaseRepositoryBuilder()) {

        @Override
        public void create(boolean bare) throws IOException {
            throw new UnsupportedOperationException();
        }

        @Override
        public ObjectDatabase getObjectDatabase() {
            throw new UnsupportedOperationException();
        }

        @Override
        public RefDatabase getRefDatabase() {
            throw new UnsupportedOperationException();
        }

        @Override
        public StoredConfig getConfig() {
            return repositoryA.getConfig();
        }

        @Override
        public void scanForRepoChanges() throws IOException {
            throw new UnsupportedOperationException();
        }

        @Override
        public void notifyIndexChanged() {
            throw new UnsupportedOperationException();
        }

        @Override
        public ReflogReader getReflogReader(String refName) throws IOException {
            throw new UnsupportedOperationException();
        }

        public ObjectReader newObjectReader() {
            return reader;
        }
    };

    DiffFormatter formatter = new DiffFormatter(NullOutputStream.INSTANCE);
    formatter.setRepository(fakeRepo);
    formatter.setDetectRenames(true);

    AbstractTreeIterator treeParserA, treeParserB;
    RevTree treeA = null, treeB = null;

    if (commitA != null) {
        treeA = new RevWalk(repositoryA).parseTree(commitA);
        treeParserA = new CanonicalTreeParser();
        ((CanonicalTreeParser) treeParserA).reset(reader, treeA);
    } else {
        treeParserA = new EmptyTreeIterator();
    }

    if (commitB != null) {
        treeB = new RevWalk(repositoryB).parseTree(commitB);
        treeParserB = new CanonicalTreeParser();
        ((CanonicalTreeParser) treeParserB).reset(reader, treeB);
    } else {
        treeParserB = new EmptyTreeIterator();
    }

    List<FileDiff> result = new ArrayList<>();
    int size = 0;
    int lines = 0;

    for (DiffEntry diff : formatter.scan(treeParserA, treeParserB)) {
        FileDiff fileDiff = new FileDiff();
        fileDiff.commitA = commitA != null ? commitA.getName() : null;
        fileDiff.commitB = commitB != null ? commitB.getName() : null;

        fileDiff.changeType = diff.getChangeType();

        fileDiff.oldMode = diff.getOldMode();
        fileDiff.newMode = diff.getNewMode();

        String pathA = diff.getPath(DiffEntry.Side.OLD);
        String pathB = diff.getPath(DiffEntry.Side.NEW);

        byte[] rawA = null;
        if (treeA != null && Arrays.asList(DELETE, MODIFY, RENAME, COPY).contains(diff.getChangeType())) {
            TreeWalk t1 = TreeWalk.forPath(repositoryA, pathA, treeA);
            ObjectId blobA = t1.getObjectId(0);
            fileDiff.pathA = pathA;

            try {
                rawA = repositoryA.open(blobA).getBytes();
                fileDiff.isBinaryA = RawText.isBinary(rawA);
                fileDiff.a = fileDiff.isBinaryA ? null : new RawText(rawA);
            } catch (org.eclipse.jgit.errors.LargeObjectException e) {
                fileDiff.addError(FileDiff.Error.A_SIZE_EXCEEDED);
            }
        }

        byte[] rawB = null;
        if (treeB != null && Arrays.asList(ADD, MODIFY, RENAME, COPY).contains(diff.getChangeType())) {
            TreeWalk t2 = TreeWalk.forPath(repositoryB, pathB, treeB);
            ObjectId blobB = t2.getObjectId(0);
            fileDiff.pathB = pathB;

            try {
                rawB = repositoryB.open(blobB).getBytes();
                fileDiff.isBinaryB = RawText.isBinary(rawB);
                fileDiff.b = fileDiff.isBinaryB ? null : new RawText(rawB);
            } catch (org.eclipse.jgit.errors.LargeObjectException e) {
                fileDiff.addError(FileDiff.Error.B_SIZE_EXCEEDED);
            }
        }

        if (size > DIFF_SIZE_LIMIT || lines > DIFF_LINE_LIMIT) {
            fileDiff.addError(FileDiff.Error.OTHERS_SIZE_EXCEEDED);
            result.add(fileDiff);
            continue;
        }

        // Get diff if necessary
        if (fileDiff.a != null && fileDiff.b != null && !(fileDiff.isBinaryA || fileDiff.isBinaryB)
                && Arrays.asList(MODIFY, RENAME).contains(diff.getChangeType())) {
            DiffAlgorithm diffAlgorithm = DiffAlgorithm
                    .getAlgorithm(repositoryB.getConfig().getEnum(ConfigConstants.CONFIG_DIFF_SECTION, null,
                            ConfigConstants.CONFIG_KEY_ALGORITHM, DiffAlgorithm.SupportedAlgorithm.HISTOGRAM));
            fileDiff.editList = diffAlgorithm.diff(RawTextComparator.DEFAULT, fileDiff.a, fileDiff.b);
            size += fileDiff.getHunks().size;
            lines += fileDiff.getHunks().lines;
        }

        // update lines and sizes
        if (fileDiff.b != null && !fileDiff.isBinaryB && diff.getChangeType().equals(ADD)) {
            lines += fileDiff.b.size();
            size += rawB.length;
        }

        // update lines and sizes
        if (fileDiff.a != null && !fileDiff.isBinaryA && diff.getChangeType().equals(DELETE)) {
            lines += fileDiff.a.size();
            size += rawA.length;
        }

        // Stop if exceeds the limit for total number of files
        if (result.size() > DIFF_FILE_LIMIT) {
            break;
        }

        result.add(fileDiff);
    }

    return result;
}

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