1 files changed, 54 insertions, 0 deletions
diff --git a/gerrit-server/src/main/java/gerrit/PRED_change_topic_1.java b/gerrit-server/src/main/java/gerrit/PRED_change_topic_1.java
new file mode 100644
index 00000000..02786e52
--- /dev/null
+++ b/gerrit-server/src/main/java/gerrit/PRED_change_topic_1.java
@@ -0,0 +1,54 @@
+// Copyright (C) 2011 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.Change;
+import com.google.gerrit.rules.PrologEnvironment;
+import com.google.gerrit.rules.StoredValues;
+
+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.PrologException;
+import com.googlecode.prolog_cafe.lang.SymbolTerm;
+import com.googlecode.prolog_cafe.lang.Term;
+
+public class PRED_change_topic_1 extends Predicate.P1 {
+  private static final long serialVersionUID = 1L;
+
+  public PRED_change_topic_1(Term a1, Operation n) {
+    arg1 = a1;
+    cont = n;
+  }
+
+  @Override
+  public Operation exec(Prolog engine) throws PrologException {
+    engine.setB0();
+    Term a1 = arg1.dereference();
+
+    PrologEnvironment env = (PrologEnvironment) engine.control;
+    Term topicTerm = Prolog.Nil;
+    Change change = StoredValues.CHANGE.get(engine);
+    String topic = change.getTopic();
+    if (topic != null) {
+      topicTerm = SymbolTerm.create(topic);
+    }
+
+    if (!a1.unify(topicTerm, engine.trail)) {
+      return engine.fail();
+    }
+    return cont;
+  }
+}
+\ No newline at end of file