parameterlist.java

linux下建立JAVA虚拟机的源码KAFFE

/*
 * ParameterList.java
 * Copyright (C) 2003 The Free Software Foundation
 * 
 * This file is part of GNU inetlib, a library.
 * 
 * GNU inetlib is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * GNU inetlib 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 General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Linking this library statically or dynamically with other modules is
 * making a combined work based on this library.  Thus, the terms and
 * conditions of the GNU General Public License cover the whole
 * combination.
 *
 * As a special exception, the copyright holders of this library give you
 * permission to link this library with independent modules to produce an
 * executable, regardless of the license terms of these independent
 * modules, and to copy and distribute the resulting executable under
 * terms of your choice, provided that you also meet, for each linked
 * independent module, the terms and conditions of the license of that
 * module.  An independent module is a module which is not derived from
 * or based on this library.  If you modify this library, you may extend
 * this exception to your version of the library, but you are not
 * obliged to do so.  If you do not wish to do so, delete this
 * exception statement from your version.
 */

package gnu.inet.smtp;

import java.util.ArrayList;
import java.util.List;

/**
 * A list of ESMTP parameters.
 *
 * @author <a href="mailto:[e-mail]">Chris Burdess</a>
 */
public final class ParameterList
{

  private List parameters = new ArrayList();

  /**
   * Returns the number of parameters in the list.
   */
  public int size()
  {
    synchronized (parameters)
      {
        return parameters.size();
      }
  }
  
  /**
   * Returns the parameter at the specified index.
   */
  public Parameter get(int index)
  {
    synchronized (parameters)
      {
        return(Parameter) parameters.get(index);
      }
  }

  /**
   * Adds a new parameter to the list.
   */
  public void add(Parameter parameter)
  {
    synchronized (parameters)
      {
        parameters.add(parameter);
      }
  }

  /**
   * String form.
   */
  public String toString()
  {
    synchronized (parameters)
      {
        int len = parameters.size();
        if (len == 0)
          {
            return "";
          }
        StringBuffer buffer = new StringBuffer();
        buffer.append(parameters.get(0));
        for (int i = 1; i < len; i++)
          {
            buffer.append(' ');
            buffer.append(parameters.get(i));
          }
        return buffer.toString();
      }
  }

}