/*
 * 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.
 */
package org.jclouds.openstack.trove.v1.functions;

import static com.google.common.base.Preconditions.checkNotNull;
import java.util.Map;
import org.jclouds.http.HttpResponse;
import org.jclouds.http.functions.ParseJson;
import com.google.common.base.Function;
import com.google.inject.Inject;

/**
 * This parses the password
 * 
 * @author Zack Shoylev
 */
public class ParsePasswordFromRootedInstance implements Function<HttpResponse, String> {

   private final ParseJson<Map<String, Map<String, String>>> json;

   @Inject
   ParsePasswordFromRootedInstance(ParseJson<Map<String, Map<String, String>>> json) {
      this.json = checkNotNull(json, "json");
   }

   /**
    * Extracts the user password from the json response
    */
   public String apply(HttpResponse from) {
      Map<String, Map<String, String>> result = json.apply(from);
      if(result.get("user") == null) 
         return null;
      return result.get("user").get("password");
   }
}