1 files changed, 57 insertions, 0 deletions
diff --git a/java/com/google/gerrit/server/rules/PrologRule.java b/java/com/google/gerrit/server/rules/PrologRule.java
new file mode 100644
index 0000000000..0c54f40b28
--- /dev/null
+++ b/java/com/google/gerrit/server/rules/PrologRule.java
@@ -0,0 +1,57 @@
+// Copyright (C) 2018 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 com.google.gerrit.server.rules;
+
+import com.google.gerrit.common.data.SubmitRecord;
+import com.google.gerrit.common.data.SubmitTypeRecord;
+import com.google.gerrit.server.project.ProjectCache;
+import com.google.gerrit.server.project.ProjectState;
+import com.google.gerrit.server.project.SubmitRuleOptions;
+import com.google.gerrit.server.query.change.ChangeData;
+import com.google.inject.Inject;
+import com.google.inject.Singleton;
+import java.util.Collection;
+import java.util.Collections;
+
+@Singleton
+public class PrologRule implements SubmitRule {
+  private final PrologRuleEvaluator.Factory factory;
+  private final ProjectCache projectCache;
+
+  @Inject
+  private PrologRule(PrologRuleEvaluator.Factory factory, ProjectCache projectCache) {
+    this.factory = factory;
+    this.projectCache = projectCache;
+  }
+
+  @Override
+  public Collection<SubmitRecord> evaluate(ChangeData cd, SubmitRuleOptions opts) {
+    ProjectState projectState = projectCache.get(cd.project());
+    // We only want to run the Prolog engine if we have at least one rules.pl file to use.
+    if ((projectState == null || !projectState.hasPrologRules()) && opts.rule() == null) {
+      return Collections.emptyList();
+    }
+
+    return getEvaluator(cd, opts).evaluate();
+  }
+
+  private PrologRuleEvaluator getEvaluator(ChangeData cd, SubmitRuleOptions opts) {
+    return factory.create(cd, opts);
+  }
+
+  public SubmitTypeRecord getSubmitType(ChangeData cd, SubmitRuleOptions opts) {
+    return getEvaluator(cd, opts).getSubmitType();
+  }
+}