UsualUsageComparator.java

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/*
 * Turró i Cutiller Foundation. License notice.
 * Copyright (C) 2011 Lluis Turró Cutiller <http://www.turro.org/>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package  org.turro.usual;
 
import java.util.Comparator;
import java.util.Map;
import java.util.TreeMap;
import org.turro.util.CompareUtil;
 
public abstract class UsualUsageComparator<V> implements Comparator<V> {
 
  private final String path;
  private final Map<String, Long> cache = new TreeMap<>();
 
  public UsualUsageComparator(String path) {
    this.path = path;
  }
 
  @Override
  public int compare(V o1, V o2) {
    Long i1 = cache.get(path + getIdentifier(o1)),
         i2 = cache.get(path + getIdentifier(o2));
    if(i1 == null) {
      i1 = UsualUsages.getUsageCount(path + getIdentifier(o1));
      cache.put(path + getIdentifier(o1), i1);
    }
    if(i2 == null) {
      i2 = UsualUsages.getUsageCount(path + getIdentifier(o2));
      cache.put(path + getIdentifier(o2), i2);
    }
    return CompareUtil.compare(i2, i1);
  }
 
  public abstract String getIdentifier(V v);
 
}