// 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.server.rules.prolog.StoredValues;
import com.googlecode.prolog_cafe.exceptions.PrologException;
import com.googlecode.prolog_cafe.lang.Operation;
import com.googlecode.prolog_cafe.lang.Prolog;
import com.googlecode.prolog_cafe.lang.Term;
import org.eclipse.jgit.revwalk.RevCommit;

/**
 * Prolog predicate for the Git author of the current patch set of a change.
 *
 * <p>Checks that the terms that are provided as input to this Prolog predicate match the Git author
 * of the current patch set of the change.
 *
 * <p>The terms that are provided as input to this Prolog predicate are:
 *
 * <ul>
 *   <li>a user ID term that matches the account ID of the Git author of the current patch set of
 *       the change
 *   <li>a string atom that matches the full name of the Git author of the current patch set of the
 *       change
 *   <li>a string atom that matches the email of the Git author of the current patch set of the
 *       change
 * </ul>
 *
 * <pre>
 *   'commit_author'(user(-ID), -FullName, -Email)
 * </pre>
 */
public class PRED_commit_author_3 extends AbstractCommitUserIdentityPredicate {
  public PRED_commit_author_3(Term a1, Term a2, Term a3, Operation n) {
    super(a1, a2, a3, n);
  }

  @Override
  public Operation exec(Prolog engine) throws PrologException {
    RevCommit revCommit = StoredValues.COMMIT.get(engine);
    return exec(engine, revCommit.getAuthorIdent());
  }
}