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// Copyright (C) 2010 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.query.change;

import static com.google.common.base.Preconditions.checkArgument;

import com.google.gerrit.entities.Account;
import com.google.gerrit.index.query.HasCardinality;
import com.google.gerrit.index.query.Predicate;
import com.google.gerrit.server.index.change.ChangeField;
import com.google.gerrit.server.notedb.ReviewerStateInternal;

public class ReviewerPredicate extends ChangeIndexPredicate implements HasCardinality {
  protected static Predicate forState(Account.Id id, ReviewerStateInternal state) {
    checkArgument(state != ReviewerStateInternal.REMOVED, "can't query by removed reviewer");
    return new ReviewerPredicate(state, id);
  }

  protected static Predicate reviewer(Account.Id id) {
    return new ReviewerPredicate(ReviewerStateInternal.REVIEWER, id);
  }

  protected static Predicate cc(Account.Id id) {
    return new ReviewerPredicate(ReviewerStateInternal.CC, id);
  }

  protected final ReviewerStateInternal state;
  protected final Account.Id id;

  private ReviewerPredicate(ReviewerStateInternal state, Account.Id id) {
    super(ChangeField.REVIEWER_SPEC, ChangeField.getReviewerFieldValue(state, id));
    this.state = state;
    this.id = id;
  }

  protected Account.Id getAccountId() {
    return id;
  }

  @Override
  public boolean match(ChangeData cd) {
    return cd.reviewers().asTable().get(state, id) != null;
  }

  @Override
  public int getCardinality() {
    return 5000;
  }
}