/*
 * Copyright (C) 2009 eXo Platform SAS.
 *
 * This 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 software 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 software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.exoplatform.services.jcr.datamodel;

import org.exoplatform.services.jcr.impl.Constants;
import org.exoplatform.services.log.ExoLogger;
import org.exoplatform.services.log.Log;

import java.io.UnsupportedEncodingException;

/**
 * Created by The eXo Platform SAS.
 * 
 * @author <a href="mailto:gennady.azarenkov@exoplatform.com">Gennady Azarenkov</a>
 * @version $Id: Identifier.java 11907 2008-03-13 15:36:21Z ksm $
 */

public class Identifier
{

   private final String string;

   /**
    * Logger.
    */
   private final static Log LOG = ExoLogger.getLogger("org.exoplatform.services.jcr.datamodel.Identifier");

   public Identifier(String stringValue)
   {
      this.string = stringValue;
      checkValue(false);
   }

   public Identifier(String stringValue, boolean onlyCheck)
   {
      this.string = stringValue;
      checkValue(onlyCheck);
   }

   public Identifier(byte[] value)
   {
      try
      {
         this.string = new String(value, Constants.DEFAULT_ENCODING);
      }
      catch (UnsupportedEncodingException e)
      {
         throw new IllegalArgumentException("Cannot read the value", e);
      }
      checkValue(true);
   }

   private void checkValue(boolean onlyCheck) throws IllegalArgumentException
   {
      if (string == null || string.isEmpty())
      {
         if (onlyCheck)
         {
            LOG.warn("An identifier cannot be empty, please check and repair the jcr data");
         }
         else
         {
            throw new IllegalArgumentException("An identifier cannot be empty");
         }
      }
   }

   /**
    * @return Returns the stringValue.
    */
   public String getString()
   {
      return string;
   }

   /**
    * {@inheritDoc}
    */
   public boolean equals(Object another)
   {
      if (another instanceof Identifier)
      {
         return string.equals(((Identifier)another).string);
      }

      return false;
   }
}