// 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;
  }
}

@@ -669,16 +669,67 @@
 ccount;%0A
+import com.google.gerrit.reviewdb.client.PatchSet;%0A
 import c
@@ -1182,59 +1182,208 @@
 m;%0A%0A
-public class PRED_uploader_1 extends Predicate.P1 %7B
+import org.slf4j.Logger;%0Aimport org.slf4j.LoggerFactory;%0A%0Apublic class PRED_uploader_1 extends Predicate.P1 %7B%0A  private static final Logger log =%0A      LoggerFactory.getLogger(PRED_uploader_1.class);%0A
 %0A  p
@@ -1673,64 +1673,282 @@
     
-Account.Id uploaderId = StoredValues.getPatchSet(engine)
+PatchSet patchSet = StoredValues.getPatchSet(engine);%0A    if (patchSet == null) %7B%0A      log.error(%22Failed to load current patch set of change %22%0A          + StoredValues.getChange(engine).getChangeId());%0A      return engine.fail();%0A    %7D%0A%0A    Account.Id uploaderId = patchSet
 .get

Fix NullPointerException in PRED_uploader_1 when patch set is missing