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/***********************************************************************************************************************
 *
 * blueBill Mobile - open source birdwatching
 * ==========================================
 *
 * Copyright (C) 2009, 2010 by Tidalwave s.a.s. (http://www.tidalwave.it)
 * http://bluebill.tidalwave.it/mobile/
 *
 ***********************************************************************************************************************
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
 * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations under the License.
 *
 ***********************************************************************************************************************
 *
 * $Id: AsSupport.java,v 7744e0357a3c 2010/06/18 17:38:43 fabrizio $
 *
 **********************************************************************************************************************/
package it.tidalwave.mobile.util;

import javax.annotation.CheckForNull;
import javax.annotation.Nonnull;
import java.io.Serializable;
import java.util.Arrays;
import java.util.ArrayList;
import java.util.List;
import org.openide.util.Lookup;
import org.openide.util.lookup.Lookups;
import it.tidalwave.util.As;
import it.tidalwave.util.NotFoundException;

/***********************************************************************************************************************
 *
 * @author  Fabrizio Giudici
 * @version $Id: $
 *
 **********************************************************************************************************************/
public class AsSupport implements As, Serializable, Lookup.Provider
  {
    private static final long serialVersionUID = 34534568437593487L;

    protected final List capabilities;

    @CheckForNull
    protected transient Lookup lookup;

    /*******************************************************************************************************************
     *
     *
     ******************************************************************************************************************/
    protected AsSupport (final @Nonnull Object ... capabilities)
      {
        this.capabilities = new ArrayList(Arrays.asList(capabilities));
      }

    /*******************************************************************************************************************
     *
     *
     ******************************************************************************************************************/
    @Nonnull
    public final  T as (final @Nonnull Class type)
      {
        return as(type, As.Defaults.throwAsException(type));
      }

    /*******************************************************************************************************************
     *
     *
     ******************************************************************************************************************/
    @Nonnull
    public  T as (final @Nonnull Class type, final @Nonnull NotFoundBehaviour nfb)
      {
        for (final Object capability : capabilities)
          {
            if (isInstanceOf(capability.getClass(), type))
              {
                return (T)capability;
              }
          }

        return nfb.run(new NotFoundException(type.getName()));
      }

    /*******************************************************************************************************************
     *
     *
     ******************************************************************************************************************/
    @Nonnull
    public synchronized Lookup getLookup()
      {
        if (lookup == null)
          {
            lookup = Lookups.fixed(capabilities.toArray()); // toArray() otherwise puts the list instance
          }

        return lookup;
      }

    /*******************************************************************************************************************
     *
     *
     ******************************************************************************************************************/
    @Override @Nonnull
    public String toString()
      {
        return String.format("%s@%x[%s]", getClass().getSimpleName(), System.identityHashCode(this), capabilities);
      }

    /*******************************************************************************************************************
     *
     *
     ******************************************************************************************************************/
    private boolean isInstanceOf (final @Nonnull Class subClass, final @Nonnull Class superClass)
      {
        if (superClass.isAssignableFrom(subClass))
          {
            return true;
          }

        for (final Class interfaceClass : subClass.getInterfaces())
          {
            if (isInstanceOf(interfaceClass, superClass))
              {
                return true;
              }
          }

        return false;
      }
  }
    

    

    

            

    

            



    
    






    
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