package org.apache.maven.shared.io.location;
   
   /*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you 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.
   */
  
  import java.util.ArrayList;
  import java.util.Iterator;
  import java.util.List;
  
  import org.apache.maven.shared.io.logging.DefaultMessageHolder;
  import org.apache.maven.shared.io.logging.MessageHolder;
  
  /**
   * The Locator.
   *
   */
  public final class Locator
  {
  
      private List<LocatorStrategy> strategies;
      private final MessageHolder messageHolder;
  
      /**
       * @param strategies List of strategies.
       * @param messageHolder {@link MessageHolder}
       */
      public Locator( List<LocatorStrategy> strategies, MessageHolder messageHolder )
      {
          this.messageHolder = messageHolder;
          this.strategies = new ArrayList<LocatorStrategy>( strategies );
      }
  
      /**
       * Create instance.
       */
      public Locator()
      {
          this.messageHolder = new DefaultMessageHolder();
          this.strategies = new ArrayList<LocatorStrategy>();
      }
  
      /**
       * @return {@link MessageHolder}
       */
      public MessageHolder getMessageHolder()
      {
          return messageHolder;
      }
  
      /**
       * @param strategy The strategy to be added.
       */
      public void addStrategy( LocatorStrategy strategy )
      {
          this.strategies.add( strategy );
      }
  
      /**
       * @param strategy the strategy to remove.
       */
      public void removeStrategy( LocatorStrategy strategy )
      {
          this.strategies.remove( strategy );
      }
  
      /**
       * @param strategies the strategies to be set.
       */
      public void setStrategies( List<LocatorStrategy> strategies )
      {
          this.strategies.clear();
          this.strategies.addAll( strategies );
      }
  
      /**
       * @return list of strategies.
       */
      public List<LocatorStrategy> getStrategies()
      {
          return strategies;
      }
  
      /**
      * @param locationSpecification location spec.
      * @return {@link Location}
      */
     public Location resolve( String locationSpecification )
     {
         Location location = null;
 
         for ( Iterator<LocatorStrategy> it = strategies.iterator(); location == null && it.hasNext(); )
         {
             LocatorStrategy strategy = (LocatorStrategy) it.next();
 
             location = strategy.resolve( locationSpecification, messageHolder );
         }
 
         return location;
     }
 
 }