Merge "Add Prolog predicate for the uploader of the patch set"

Documentation/prolog-change-facts.txt

@@ -56,6 +56,9 @@ of them we must use a qualified name like `gerrit:change_branch(X)`.
                       |`current_user(user(anonymous)).`
                       |`current_user(user(peer_daemon)).`
                       |`current_user(user(replication)).`
+
+|`uploader/1`     |`uploader(user(1000000)).`
+    |Uploader as `user(ID)` term. ID is the numeric account ID
 |=============================================================================
 
 In addition Gerrit provides a set of built-in helper predicates that can be used

gerrit-server/src/main/java/gerrit/PRED_uploader_1.java

@@ -0,0 +1,50 @@
+// Copyright (C) 2016 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package gerrit;
+
+import com.google.gerrit.reviewdb.client.Account;
+import com.google.gerrit.rules.StoredValues;
+
+import com.googlecode.prolog_cafe.exceptions.PrologException;
+import com.googlecode.prolog_cafe.lang.IntegerTerm;
+import com.googlecode.prolog_cafe.lang.Operation;
+import com.googlecode.prolog_cafe.lang.Predicate;
+import com.googlecode.prolog_cafe.lang.Prolog;
+import com.googlecode.prolog_cafe.lang.StructureTerm;
+import com.googlecode.prolog_cafe.lang.SymbolTerm;
+import com.googlecode.prolog_cafe.lang.Term;
+
+public class PRED_uploader_1 extends Predicate.P1 {
+  private static final SymbolTerm user = SymbolTerm.intern("user", 1);
+
+  public PRED_uploader_1(Term a1, Operation n) {
+    arg1 = a1;
+    cont = n;
+  }
+
+  @Override
+  public Operation exec(Prolog engine) throws PrologException {
+    engine.setB0();
+    Term a1 = arg1.dereference();
+
+    Account.Id uploaderId = StoredValues.getPatchSet(engine).getUploader();
+
+    if (!a1.unify(new StructureTerm(user, new IntegerTerm(uploaderId.get())),
+        engine.trail)) {
+      return engine.fail();
+    }
+    return cont;
+  }
+}