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jclouds components to access Savvis Symphony VPDC
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/**
 * Licensed to jclouds, Inc. (jclouds) under one or more
 * contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  jclouds 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.savvis.vpdc.binders;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;

import java.net.URI;
import java.util.Map;
import java.util.Properties;

import javax.inject.Singleton;
import javax.ws.rs.core.MediaType;
import javax.xml.parsers.FactoryConfigurationError;
import javax.xml.parsers.ParserConfigurationException;

import org.jclouds.http.HttpRequest;
import org.jclouds.rest.MapBinder;
import org.jclouds.rest.binders.BindToStringPayload;
import org.jclouds.rest.internal.GeneratedHttpRequest;

import com.jamesmurty.utils.XMLBuilder;

/**
 * 
 * @author Kedar Dave
 * 
 */
@Singleton
public class BindCloneVMToXmlPayload extends BindToStringPayload implements MapBinder {
   @Override
   public  R bindToRequest(R request, Object toBind) {
      throw new IllegalStateException("BindFirewallRuleToXmlPayload needs parameters");

   }

   protected URI findVAppURIInArgsOrNull(GeneratedHttpRequest gRequest) {
      for (Object arg : gRequest.getInvocation().getArgs()) {
         if (arg instanceof URI) {
            return (URI) arg;
         } else if (arg instanceof URI[]) {
        	 URI[] rules = (URI[]) arg;
            return (rules.length > 0) ? rules[0] : null;
         }
      }
      return null;
   }

   @Override
   public  R bindToRequest(R request, Map postParams) {
      checkArgument(checkNotNull(request, "request") instanceof GeneratedHttpRequest,
            "this binder is only valid for GeneratedHttpRequests!");
      GeneratedHttpRequest gRequest = (GeneratedHttpRequest) request;
      request = super.bindToRequest(request,
            generateXml(findVAppURIInArgsOrNull(gRequest), (String) postParams.get("name"), (String) postParams.get("networkTierName")));
      request.getPayload().getContentMetadata().setContentType(MediaType.APPLICATION_XML);
      return request;
   }

   public String generateXml(URI vAppURI, String newVAppName, String networkTierName) {
      checkNotNull(vAppURI, "vAppURI");

      try {
         XMLBuilder rootBuilder = buildRoot(newVAppName);
         addVAppSection(rootBuilder, vAppURI, networkTierName);
         Properties outputProperties = new Properties();
         return rootBuilder.asString(outputProperties);
      } catch (Exception e) {
         return null;
      }
   }

   void addVAppSection(XMLBuilder rootBuilder, URI vAppURI, String networkTierName) {
	  String vAppStr = "vApp/";
	  // TODO: Savvis returns network names with a - instead of space on getNetworkInVDC call,
	  // fix this once savvis api starts returning correctly
      rootBuilder.e("Description").t(networkTierName.replace("-", " "));
      String genericVAppURI = vAppURI.toString().substring(0, vAppURI.toString().indexOf("vApp") + vAppStr.length());
      rootBuilder.e("VApp").a("href", genericVAppURI).a("type", "application/vnd.vmware.vcloud.vApp+xml");
   }

   protected XMLBuilder buildRoot(String newVAppName) throws ParserConfigurationException, FactoryConfigurationError {
	      XMLBuilder rootBuilder = XMLBuilder.create("CloneVAppParams")
	      		.a("xmlns", "http://www.vmware.com/vcloud/v0.8")
	      		.a("xmlns:xsi", "http://www.w3.org/2001/XMLSchema-instance")
	      		.a("name", newVAppName)
	      		.a("deploy" , "true")
	      		.a("powerOn" , "true")
	            .a("xsi:schemaLocation", "http://www.vmware.com/vcloud/v0.8 https://api.savvis.net/ns/vcloud.xsd");
	      return rootBuilder;
	   }

   protected String ifNullDefaultTo(String value, String defaultValue) {
      return value != null ? value : checkNotNull(defaultValue, "defaultValue");
   }

}