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A tool for merging GTFS feeds.
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/**
 * Copyright (C) 2012 Google, Inc.
 *
 * 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 org.onebusaway.gtfs_merge.strategies;

import java.util.Collection;

import org.onebusaway.gtfs.model.AgencyAndId;
import org.onebusaway.gtfs.model.ShapePoint;
import org.onebusaway.gtfs.model.Trip;
import org.onebusaway.gtfs.services.GtfsMutableRelationalDao;
import org.onebusaway.gtfs.services.GtfsRelationalDao;
import org.onebusaway.gtfs_merge.GtfsMergeContext;

/**
 * Entity merge strategy for handling {@link ShapePoint} entities. Shape points
 * are an example of an entity collection, since multiple shape point entities
 * are linked by a sinlge {@code shape_id}.
 * 
 * @author bdferris
 */
public class ShapePointMergeStrategy extends
    AbstractCollectionEntityMergeStrategy {

  public ShapePointMergeStrategy() {
    super("shapes.txt shape_id");
  }

  @Override
  public void getEntityTypes(Collection> entityTypes) {
    entityTypes.add(ShapePoint.class);
  }

  @Override
  protected Collection getKeys(GtfsRelationalDao dao) {
    return dao.getAllShapeIds();
  }

  @Override
  protected double scoreDuplicateKey(GtfsMergeContext context, AgencyAndId key) {
    // TODO - Implement something appropriate here
    return 0.0;
  }

  @Override
  protected void renameKey(GtfsMergeContext context, AgencyAndId oldId,
      AgencyAndId newId) {
    GtfsRelationalDao source = context.getSource();
    for (ShapePoint shapePoint : source.getShapePointsForShapeId(oldId)) {
      shapePoint.setShapeId(newId);
    }
    for (Trip trip : source.getTripsForShapeId(oldId)) {
      trip.setShapeId(newId);
    }
  }

  @Override
  protected void saveElementsForKey(GtfsMergeContext context,
      AgencyAndId shapeId) {
    GtfsRelationalDao source = context.getSource();
    GtfsMutableRelationalDao target = context.getTarget();
    for (ShapePoint shapePoint : source.getShapePointsForShapeId(shapeId)) {
      shapePoint.setId(0);
      shapePoint.setSequence(context.getNextSequenceCounter());
      target.saveEntity(shapePoint);
    }
  }

}