//
   //  ========================================================================
   //  Copyright (c) 1995-2015 Mort Bay Consulting Pty. Ltd.
   //  ------------------------------------------------------------------------
   //  All rights reserved. This program and the accompanying materials
   //  are made available under the terms of the Eclipse Public License v1.0
   //  and Apache License v2.0 which accompanies this distribution.
   //
   //      The Eclipse Public License is available at
  //      http://www.eclipse.org/legal/epl-v10.html
  //
  //      The Apache License v2.0 is available at
  //      http://www.opensource.org/licenses/apache2.0.php
  //
  //  You may elect to redistribute this code under either of these licenses.
  //  ========================================================================
  //
  
  package org.eclipse.jetty.websocket.server.pathmap;
  
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.Iterator;
  import java.util.List;
  
  import org.eclipse.jetty.util.annotation.ManagedAttribute;
  import org.eclipse.jetty.util.annotation.ManagedObject;
  import org.eclipse.jetty.util.component.ContainerLifeCycle;
  import org.eclipse.jetty.util.component.Dumpable;
  import org.eclipse.jetty.util.log.Log;
  import org.eclipse.jetty.util.log.Logger;
  import org.eclipse.jetty.websocket.server.pathmap.PathMappings.MappedResource;
  
  /**
   * Path Mappings of PathSpec to Resource.
   * <p>
   * Sorted into search order upon entry into the Set
   * 
   * @param <E> the type of mapping endpoint
   */
  @ManagedObject("Path Mappings")
  public class PathMappings<E> implements Iterable<MappedResource<E>>, Dumpable
  {
      @ManagedObject("Mapped Resource")
      public static class MappedResource<E> implements Comparable<MappedResource<E>>
      {
          private final PathSpec pathSpec;
          private final E resource;
  
          public MappedResource(PathSpec pathSpec, E resource)
          {
              this.pathSpec = pathSpec;
              this.resource = resource;
          }
  
          /**
           * Comparison is based solely on the pathSpec
           */
          @Override
          public int compareTo(MappedResource<E> other)
          {
              return this.pathSpec.compareTo(other.pathSpec);
          }
  
          @Override
          public boolean equals(Object obj)
          {
              if (this == obj)
              {
                  return true;
              }
              if (obj == null)
              {
                  return false;
              }
              if (getClass() != obj.getClass())
              {
                  return false;
              }
              MappedResource<?> other = (MappedResource<?>)obj;
              if (pathSpec == null)
              {
                  if (other.pathSpec != null)
                  {
                      return false;
                  }
              }
              else if (!pathSpec.equals(other.pathSpec))
              {
                  return false;
              }
              return true;
          }
  
          @ManagedAttribute(value = "path spec", readonly = true)
          public PathSpec getPathSpec()
          {
              return pathSpec;
         }
 
         @ManagedAttribute(value = "resource", readonly = true)
         public E getResource()
         {
             return resource;
         }
 
         @Override
         public int hashCode()
         {
             final int prime = 31;
             int result = 1;
             result = (prime * result) + ((pathSpec == null)?0:pathSpec.hashCode());
             return result;
         }
 
         @Override
         public String toString()
         {
             return String.format("MappedResource[pathSpec=%s,resource=%s]",pathSpec,resource);
         }
     }
 
     private static final Logger LOG = Log.getLogger(PathMappings.class);
     private List<MappedResource<E>> mappings = new ArrayList<MappedResource<E>>();
     private MappedResource<E> defaultResource = null;
 
     @Override
     public String dump()
     {
         return ContainerLifeCycle.dump(this);
     }
 
     @Override
     public void dump(Appendable out, String indent) throws IOException
     {
         ContainerLifeCycle.dump(out,indent,mappings);
     }
 
     @ManagedAttribute(value = "mappings", readonly = true)
     public List<MappedResource<E>> getMappings()
     {
         return mappings;
     }
     
     public void reset()
     {
         mappings.clear();
     }
 
     public MappedResource<E> getMatch(String path)
     {
         int len = mappings.size();
         for (int i = 0; i < len; i++)
         {
             MappedResource<E> mr = mappings.get(i);
             if (mr.getPathSpec().matches(path))
             {
                 return mr;
             }
         }
         return defaultResource;
     }
 
     @Override
     public Iterator<MappedResource<E>> iterator()
     {
         return mappings.iterator();
     }
 
     public void put(PathSpec pathSpec, E resource)
     {
         MappedResource<E> entry = new MappedResource<>(pathSpec,resource);
         if (pathSpec.group == PathSpecGroup.DEFAULT)
         {
             defaultResource = entry;
         }
         // TODO: warning on replacement of existing mapping?
         mappings.add(entry);
         if (LOG.isDebugEnabled())
             LOG.debug("Added {} to {}",entry,this);
         Collections.sort(mappings);
     }
 
     @Override
     public String toString()
     {
         return String.format("%s[size=%d]",this.getClass().getSimpleName(),mappings.size());
     }
 }