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/**
 *
 * Copyright (C) 2010 Cloud Conscious, LLC. 
 *
 * ====================================================================
 * 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.
 * ====================================================================
 */

package org.jclouds.vcloud.compute.functions;

import java.net.URI;
import java.util.NoSuchElementException;
import java.util.Set;

import javax.annotation.Resource;
import javax.inject.Inject;
import javax.inject.Singleton;

import org.jclouds.collect.Memoized;
import org.jclouds.domain.Location;
import org.jclouds.logging.Logger;
import org.jclouds.vcloud.domain.ReferenceType;

import com.google.common.base.Supplier;

/**
 * @author Adrian Cole
 */
@Singleton
public class FindLocationForResource {

   @Resource
   protected Logger logger = Logger.NULL;

   final Supplier> locations;

   @Inject
   public FindLocationForResource(@Memoized Supplier> locations) {
      this.locations = locations;
   }

   /**
    * searches for a location associated with this resource.
    * 
    * @throws NoSuchElementException
    *            if not found
    */
   public Location apply(ReferenceType resource) {
      for (Location input : locations.get()) {
         do {
            // The "name" isn't always present, ex inside a vApp we have a rel
            // link that only includes href and type.
            if (URI.create(input.getId()).equals(resource.getHref()))
               return input;
            input = input.getParent();
         } while (input.getParent() != null);
      }
      throw new NoSuchElementException(String.format("resource: %s not found in locations: %s", resource, locations
               .get()));
   }
}