/**
    *
    * Copyright (C) 2011 Cloud Conscious, LLC. <info@cloudconscious.com>
    *
    * ====================================================================
    * 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.cloudloadbalancers.functions;
  
  import java.util.Map;
  import java.util.Set;
  
  import javax.inject.Inject;
  
  import org.jclouds.cloudloadbalancers.domain.LoadBalancer;
  import org.jclouds.http.HttpRequest;
  import org.jclouds.http.HttpResponse;
  import org.jclouds.http.functions.ParseJson;
  import org.jclouds.rest.InvocationContext;
  
  import com.google.common.base.Function;
  import com.google.common.collect.ImmutableSet;
  import com.google.common.collect.Iterables;
  
  /**
   * @author Adrian Cole
   */
  public class UnwrapLoadBalancers implements Function<HttpResponse, Set<LoadBalancer>>,
           InvocationContext<UnwrapLoadBalancers> {
  
     private final ParseJson<Map<String, Set<LB>>> json;
     private ConvertLB convertLB;
  
     @Inject
     UnwrapLoadBalancers(ParseJson<Map<String, Set<LB>>> json) {
        this.json = json;
     }
  
     @Override
     public Set<LoadBalancer> apply(HttpResponse arg0) {
        Map<String, Set<LB>> map = json.apply(arg0);
        if (map.size() == 0)
           return ImmutableSet.<LoadBalancer> of();
        ;
        return ImmutableSet.copyOf(Iterables.transform(Iterables.get(map.values(), 0), convertLB));
     }
  
     @Override
     public UnwrapLoadBalancers setContext(HttpRequest request) {
        return setRegion(request.getEndpoint().getHost().substring(0, request.getEndpoint().getHost().indexOf('.')));
     }
  
     UnwrapLoadBalancers setRegion(String region) {
        this.convertLB = new ConvertLB(region);
        return this;
     }
  
  }