// Copyright (C) 2013 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.gerrit.server.index.ChangeField.MERGEABLE;

import com.google.gerrit.server.index.ChangeField;
import com.google.gerrit.server.index.FieldDef;
import com.google.gerrit.server.index.FieldDef.FillArgs;
import com.google.gerrit.server.index.IndexPredicate;
import com.google.gerrit.server.index.Schema;
import com.google.gwtorm.server.OrmException;

class IsMergeablePredicate extends IndexPredicate<ChangeData> {
  @SuppressWarnings("deprecation")
  static FieldDef<ChangeData, ?> mergeableField(Schema<ChangeData> schema) {
    if (schema == null) {
      return ChangeField.LEGACY_MERGEABLE;
    }
    FieldDef<ChangeData, ?> f = schema.getFields().get(MERGEABLE.getName());
    if (f != null) {
      return f;
    }
    return schema.getFields().get(ChangeField.LEGACY_MERGEABLE.getName());
  }

  private final FillArgs args;

  IsMergeablePredicate(Schema<ChangeData> schema,
      FillArgs args) {
    super(mergeableField(schema), "1");
    this.args = args;
  }

  @Override
  public boolean match(ChangeData object) throws OrmException {
    return getValue().equals(getField().get(object, args));
  }

  @Override
  public int getCost() {
    return 1;
  }
}