singletonnonreferentialresolver.java

自然语言处理领域的一个开发包

///////////////////////////////////////////////////////////////////////////////
//Copyright (C) 2003 Thomas Morton
//
//This library is free software; you can redistribute it and/or
//modify it under the terms of the GNU Lesser General Public
//License as published by the Free Software Foundation; either
//version 2.1 of the License, or (at your option) any later version.
//
//This library 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 Lesser General Public License for more details.
//
//You should have received a copy of the GNU Lesser General Public
//License along with this program; if not, write to the Free Software
//Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
//////////////////////////////////////////////////////////////////////////////
package opennlp.tools.coref.resolver;

import java.io.IOException;

/**
 * This class allows you to share a single instance of a non-referential resolver
 * amoung several resolvers.   
 */
public class SingletonNonReferentialResolver extends DefaultNonReferentialResolver {
  
  private static SingletonNonReferentialResolver resolver;
  private static boolean trained;
  
  private SingletonNonReferentialResolver(String projectName, ResolverMode mode) throws IOException {
    super(projectName, "nonref", mode);
  }
  
  public static SingletonNonReferentialResolver getInstance(String modelName, ResolverMode mode) throws IOException {
    if (resolver == null) {
      resolver = new SingletonNonReferentialResolver(modelName, mode);
    }
    return resolver;
  }
  
  
  public void train() throws IOException {
    if (!trained) {
      super.train();
      trained = true;
    }
  }
}