Class RefState

java/com/google/gerrit/index/RefState.java:33–82

import org.eclipse.jgit.lib.Repository;

@AutoValue
public abstract class RefState {
  public static ImmutableSetMultimap<Project.NameKey, RefState> parseStates(
      Iterable<byte[]> states) {
    RefState.check(states != null, null);
    ImmutableSetMultimap.Builder<Project.NameKey, RefState> result = ImmutableSetMultimap.builder();
    for (byte[] b : states) {
      RefState.check(b != null, null);
      String s = new String(b, UTF_8);
      List<String> parts = Splitter.on(':').splitToList(s);
      RefState.check(parts.size() == 3 && !parts.get(0).isEmpty() && !parts.get(1).isEmpty(), s);
      result.put(Project.NameKey.parse(parts.get(0)), RefState.create(parts.get(1), parts.get(2)));
    }
    return result.build();
  }

  public static RefState create(String ref, String sha) {
    return new AutoValue_RefState(ref, ObjectId.fromString(sha));
  }

  public static RefState create(String ref, @Nullable ObjectId id) {
    return new AutoValue_RefState(ref, firstNonNull(id, ObjectId.zeroId()));
  }

  public static RefState of(Ref ref) {
    return new AutoValue_RefState(ref.getName(), ref.getObjectId());
  }

  public byte[] toByteArray(Project.NameKey project) {
    byte[] a = (project.toString() + ':' + ref() + ':').getBytes(UTF_8);
    byte[] b = new byte[a.length + ObjectIds.STR_LEN];
    System.arraycopy(a, 0, b, 0, a.length);
    id().copyTo(b, a.length);
    return b;
  }

  public static void check(boolean condition, String str) {
    checkArgument(condition, "invalid RefState: %s", str);
  }

  public abstract String ref();

  public abstract ObjectId id();

  public boolean match(Repository repo) throws IOException {
    Ref ref = repo.exactRef(ref());
    ObjectId expected = ref != null ? ref.getObjectId() : ObjectId.zeroId();
    return id().equals(expected);
  }
}