ArrivalsAndDeparturesQueryBeanCacheableObjectKeyFactory.java

/**
 * Copyright (C) 2011 Brian Ferris <bdferris@onebusaway.org>
 *
 * 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.presentation.impl.transit_data;

import org.onebusaway.container.cache.CacheKeyInfo;
import org.onebusaway.container.cache.CacheableObjectKeyFactory;
import org.onebusaway.transit_data.model.ArrivalsAndDeparturesQueryBean;

public class ArrivalsAndDeparturesQueryBeanCacheableObjectKeyFactory implements
    CacheableObjectKeyFactory {

  private long _timeWindow = 30 * 1000;

  public ArrivalsAndDeparturesQueryBeanCacheableObjectKeyFactory(
      int arrivalAndDepartureCacheWindow) {
    _timeWindow = arrivalAndDepartureCacheWindow * 1000;
  }

  public void setTimeWindow(int timeWindowInSeconds) {
    _timeWindow = timeWindowInSeconds * 1000;
  }

  @Override
  public CacheKeyInfo createKey(Object object) {
    ArrivalsAndDeparturesQueryBean query = (ArrivalsAndDeparturesQueryBean) object;
    query = new ArrivalsAndDeparturesQueryBean(query);
    query.setTime(snapTime(query.getTime()));
    return new CacheKeyInfo(query, false);
  }

  private long snapTime(long time) {
    return (time / _timeWindow) * _timeWindow;
  }
}