AbstractAttributes.java

/**
 * 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.gatein.mop.core.util;

import org.gatein.mop.api.Key;
import org.gatein.mop.api.Attributes;
import org.gatein.mop.api.ValueType;

import java.util.Date;

/**
 * @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a>
 * @version $Revision$
 */
public abstract class AbstractAttributes implements Attributes
{

   protected abstract Object get(String name);

   protected abstract void set(String name, Object o);

   private <T> T getObject(String name, ValueType<T> type, T defaultValue)
   {
      if (name == null)
      {
         throw new NullPointerException();
      }
      Object o = get(name);
      if (o == null)
      {
         return defaultValue;
      }
      else
      {
         return type.cast(o);
      }
   }

   public final Object getObject(String name)
   {
      if (name == null)
      {
         throw new NullPointerException();
      }
      Object o = get(name);
      if (o == null)
      {
         return null;
      }
      else
      {
         ValueType.get(o);
         return o;
      }
   }

   public final <T> void setObject(String name, T value)
   {
      if (name == null)
      {
         throw new NullPointerException();
      }
      if (value == null)
      {
         set(name, null);
      }
      else
      {
         ValueType.get(value);
         set(name, value);
      }
   }

   public final ValueType<?> getType(String name)
   {
      if (name == null)
      {
         throw new NullPointerException();
      }
      Object o = get(name);
      if (o == null)
      {
         return null;
      }
      else
      {
         return ValueType.get(o);
      }
   }

   public final String getString(String name)
   {
      return getObject(name, ValueType.STRING, null);
   }

   public final void setString(String name, String value)
   {
      setObject(name, value);
   }

   public final Boolean getBoolean(String name)
   {
      return getObject(name, ValueType.BOOLEAN, null);
   }

   public final void setBoolean(String name, Boolean value)
   {
      setObject(name, value);
   }

   public final Integer getInteger(String name)
   {
      return getObject(name, ValueType.INTEGER, null);
   }

   public final void setInteger(String name, Integer value)
   {
      setObject(name, value);
   }

   public final Date getDate(String name)
   {
      return getObject(name, ValueType.DATE, null);
   }

   public final void setDate(String name, Date value)
   {
      setObject(name, value);
   }

   public final Double getDouble(String name)
   {
      return getObject(name, ValueType.DOUBLE, null);
   }

   public final void setDouble(String name, Double value)
   {
      setObject(name, value);
   }

   public final <T> T getValue(Key<T> key, T defaultValue)
   {
      return getObject(key.getName(), key.getType(), defaultValue);
   }

   public final <T> T getValue(Key<T> key)
   {
      return getObject(key.getName(), key.getType(), null);
   }

   public final <T> void setValue(Key<T> key, T value)
   {
      setObject(key.getName(), value);
   }
}