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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.xml.ovf;

import java.util.Map;

import org.jclouds.http.functions.ParseSax;
import org.jclouds.vcloud.domain.ovf.ResourceAllocation;
import org.jclouds.vcloud.domain.ovf.ResourceType;
import org.jclouds.vcloud.util.Utils;
import org.xml.sax.Attributes;

/**
 * @author Adrian Cole
 */
public class ResourceAllocationHandler extends ParseSax.HandlerWithResult {
   protected StringBuilder currentText = new StringBuilder();

   protected String address;
   protected Integer addressOnParent;
   protected String hostResource;
   protected String allocationUnits;
   protected String automaticAllocation;
   protected Boolean connected;
   protected String description;
   protected String elementName;
   protected int instanceID;
   protected Integer parent;
   protected String resourceSubType;
   protected ResourceType resourceType;
   protected long virtualQuantity = 1;
   protected String virtualQuantityUnits;

   public org.jclouds.vcloud.domain.ovf.ResourceAllocation getResult() {
      if (allocationUnits != null)
         virtualQuantityUnits = allocationUnits;
      ResourceAllocation allocation = newResourceAllocation();
      address = null;
      addressOnParent = null;
      allocationUnits = null;
      automaticAllocation = null;
      connected = null;
      description = null;
      elementName = null;
      instanceID = -1;
      parent = null;
      resourceSubType = null;
      resourceType = null;
      virtualQuantity = 1;
      virtualQuantityUnits = null;
      hostResource = null;
      return allocation;
   }

   protected ResourceAllocation newResourceAllocation() {
      return new ResourceAllocation(instanceID, elementName, description, resourceType, resourceSubType, hostResource,
               address, addressOnParent, parent, connected, virtualQuantity, virtualQuantityUnits);
   }

   @Override
   public void startElement(String uri, String localName, String qName, Attributes attrs) {
      Map attributes = Utils.cleanseAttributes(attrs);
      if (qName.endsWith("Connection")) {
         connected = new Boolean(attributes.get("connected"));
      }
   }

   @Override
   public void endElement(String uri, String localName, String qName) {
      String current = currentOrNull();
      if (current != null) {
         if (qName.endsWith("Address")) {
            address = current;
         } else if (qName.endsWith("AddressOnParent")) {
            addressOnParent = Integer.parseInt(current);
         } else if (qName.endsWith("AllocationUnits")) {
            allocationUnits = current;
         } else if (qName.endsWith("Description")) {
            description = current;
         } else if (qName.endsWith("ElementName")) {
            elementName = current;
         } else if (qName.endsWith("InstanceID")) {
            instanceID = Integer.parseInt(current);
         } else if (qName.endsWith("Parent")) {
            parent = Integer.parseInt(current);
         } else if (qName.endsWith("ResourceSubType")) {
            resourceSubType = current;
         } else if (qName.endsWith("ResourceType")) {
            resourceType = ResourceType.fromValue(current);
         } else if (qName.endsWith("VirtualQuantity")) {
            virtualQuantity = Long.parseLong(current);
         } else if (qName.endsWith("VirtualQuantityUnits")) {
            virtualQuantityUnits = current;
         } else if (qName.endsWith("HostResource")) {
            hostResource = currentText.toString().trim();
            virtualQuantity = Long.parseLong(current);
            virtualQuantityUnits = "byte * 2^20";
         }
      }
      currentText = new StringBuilder();
   }

   public void characters(char ch[], int start, int length) {
      currentText.append(ch, start, length);
   }

   protected String currentOrNull() {
      String returnVal = currentText.toString().trim();
      return returnVal.equals("") ? null : returnVal;
   }
}