Don't wrap SHA-1s when searching for commits

(Abbreviated)ObjectId.fromString would throw IllegalArgumentException
if the value is not commit-shaped, which results in an ugly error
shown to the user. Plus, it's extra unnecessary allocations. Instead,
just pass the strings in verbatim. This might return zero results in
case of a typo, but that's already the behavior of most other
operators.

Change-Id: I905a32a6d1f2524f9349f7a19815bca03b991125

gerrit-server/src/main/java/com/google/gerrit/server/query/change/ChangeQueryBuilder.java

@@ -61,10 +61,8 @@ import com.google.inject.util.Providers;
 
 import org.eclipse.jgit.errors.ConfigInvalidException;
 import org.eclipse.jgit.errors.RepositoryNotFoundException;
-import org.eclipse.jgit.lib.AbbreviatedObjectId;
 import org.eclipse.jgit.lib.Config;
 import org.eclipse.jgit.lib.Constants;
-import org.eclipse.jgit.lib.ObjectId;
 import org.eclipse.jgit.lib.Repository;
 
 import java.io.IOException;
@@ -434,9 +432,9 @@ public class ChangeQueryBuilder extends QueryBuilder<ChangeData> {
   @Operator
   public Predicate<ChangeData> commit(String id) {
     if (id.length() == Constants.OBJECT_ID_STRING_LENGTH) {
-      return new ExactCommitPredicate(ObjectId.fromString(id));
+      return new ExactCommitPredicate(id);
     }
-    return new CommitPrefixPredicate(AbbreviatedObjectId.fromString(id));
+    return new CommitPrefixPredicate(id);
   }
 
   @Operator

gerrit-server/src/main/java/com/google/gerrit/server/query/change/CommitPrefixPredicate.java

@@ -19,25 +19,19 @@ import com.google.gerrit.server.index.ChangeField;
 import com.google.gerrit.server.index.IndexPredicate;
 import com.google.gwtorm.server.OrmException;
 
-import org.eclipse.jgit.lib.AbbreviatedObjectId;
-import org.eclipse.jgit.lib.ObjectId;
-
 class CommitPrefixPredicate extends IndexPredicate<ChangeData> {
-  private final AbbreviatedObjectId abbrevId;
-
-  CommitPrefixPredicate(AbbreviatedObjectId id) {
-    super(ChangeField.COMMIT, id.name());
-    this.abbrevId = id;
+  CommitPrefixPredicate(String prefix) {
+    super(ChangeField.COMMIT, prefix);
   }
 
   @Override
   public boolean match(final ChangeData object) throws OrmException {
+    String prefix = getValue().toLowerCase();
     for (PatchSet p : object.patchSets()) {
-      if (p.getRevision() != null && p.getRevision().get() != null) {
-        final ObjectId id = ObjectId.fromString(p.getRevision().get());
-        if (abbrevId.prefixCompare(id) == 0) {
-          return true;
-        }
+      if (p.getRevision() != null
+          && p.getRevision().get() != null
+          && p.getRevision().get().startsWith(prefix)) {
+        return true;
       }
     }
     return false;

gerrit-server/src/main/java/com/google/gerrit/server/query/change/ExactCommitPredicate.java

@@ -19,26 +19,20 @@ import com.google.gerrit.server.index.ChangeField;
 import com.google.gerrit.server.index.IndexPredicate;
 import com.google.gwtorm.server.OrmException;
 
-import org.eclipse.jgit.lib.ObjectId;
-
 import java.util.Objects;
 
 class ExactCommitPredicate extends IndexPredicate<ChangeData> {
-  private final ObjectId id;
-
-  ExactCommitPredicate(ObjectId id) {
-    super(ChangeField.COMMIT, id.name());
-    this.id = id;
+  ExactCommitPredicate(String id) {
+    super(ChangeField.COMMIT, id);
   }
 
   @Override
   public boolean match(final ChangeData object) throws OrmException {
-    String idStr = id.name();
+    String id = getValue().toLowerCase();
     for (PatchSet p : object.patchSets()) {
-      if (p.getRevision() != null && p.getRevision().get() != null) {
-        if (Objects.equals(p.getRevision().get(), idStr)) {
-          return true;
-        }
+      if (p.getRevision() != null
+          && Objects.equals(p.getRevision().get(), id)) {
+        return true;
       }
     }
     return false;

gerrit-server/src/main/java/com/google/gerrit/server/query/change/InternalChangeQuery.java

@@ -66,7 +66,7 @@ public class InternalChangeQuery {
     return new ChangeStatusPredicate(status);
   }
 
-  private static Predicate<ChangeData> commit(ObjectId id) {
+  private static Predicate<ChangeData> commit(String id) {
     return new ExactCommitPredicate(id);
   }
 
@@ -129,7 +129,7 @@ public class InternalChangeQuery {
       List<String> hashes, int batchSize) throws OrmException {
     List<Predicate<ChangeData>> commits = new ArrayList<>(hashes.size());
     for (String s : hashes) {
-      commits.add(commit(ObjectId.fromString(s)));
+      commits.add(commit(s));
     }
     int numBatches = (hashes.size() / batchSize) + 1;
     List<Predicate<ChangeData>> queries = new ArrayList<>(numBatches);
@@ -164,7 +164,7 @@ public class InternalChangeQuery {
   }
 
   public List<ChangeData> byCommit(ObjectId id) throws OrmException {
-    return query(commit(id));
+    return query(commit(id.name()));
   }
 
   public List<ChangeData> byProjectGroups(Project.NameKey project,