diff options
Diffstat (limited to 'org.eclipse.jgit')
| -rw-r--r-- | org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/PackReverseIndexFactory.java | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/PackReverseIndexFactory.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/PackReverseIndexFactory.java index b16da5ae83..32830c3cf0 100644 --- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/PackReverseIndexFactory.java +++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/PackReverseIndexFactory.java @@ -14,6 +14,8 @@ import static org.eclipse.jgit.internal.storage.file.PackReverseIndex.MAGIC; import static org.eclipse.jgit.internal.storage.file.PackReverseIndex.VERSION_1; import java.io.DataInput; +import java.io.File; +import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStream; import java.security.DigestInputStream; @@ -23,12 +25,43 @@ import java.util.Arrays; import org.eclipse.jgit.internal.JGitText; import org.eclipse.jgit.lib.Constants; import org.eclipse.jgit.util.IO; +import org.eclipse.jgit.util.io.SilentFileInputStream; /** * Factory for creating instances of {@link PackReverseIndex}. */ public final class PackReverseIndexFactory { /** + * Create an in-memory pack reverse index by reading it from the given file + * if the file exists, or computing it from the given pack index if the file + * doesn't exist. + * + * @param idxFile + * the file to read the pack file from, if it exists + * @param objectCount + * the number of objects in the corresponding pack + * @param packIndexSupplier + * a function to lazily get the corresponding forward index + * @return the reverse index instance + * @throws IOException + * if reading from the file fails + */ + static PackReverseIndex openOrCompute(File idxFile, long objectCount, + PackBitmapIndex.SupplierWithIOException<PackIndex> packIndexSupplier) + throws IOException { + try (SilentFileInputStream fd = new SilentFileInputStream(idxFile)) { + return readFromFile(fd, objectCount, packIndexSupplier); + } catch (FileNotFoundException e) { + return computeFromIndex(packIndexSupplier.get()); + } catch (IOException e) { + throw new IOException( + MessageFormat.format(JGitText.get().unreadablePackIndex, + idxFile.getAbsolutePath()), + e); + } + } + + /** * Compute an in-memory pack reverse index from the in-memory pack forward * index. This computation uses insertion sort, which has a quadratic * runtime on average. |