gt: 		Map<String, Object> returnMap = new HashMap<String, Object>();
context: /*******************************************************************************
   * ===========================================================
   * Ankush : Big Data Cluster Management Solution
   * ===========================================================
   * 
   * (C) Copyright 2014, by Impetus Technologies
   * 
   * This is free software; you can redistribute it and/or modify it under
   * the terms of the GNU Lesser General Public License (LGPL v3) as
   * published by the Free Software Foundation;
   * 
   * This software is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
   * See the GNU Lesser General Public License for more details.
   * 
   * You should have received a copy of the GNU Lesser General Public License 
   * along with this software; if not, write to the Free Software Foundation, 
   * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
   ******************************************************************************/
  package com.impetus.ankush.common.controller.rest;
  
  import java.security.Principal;
  import java.util.HashMap;
  import java.util.LinkedHashMap;
  import java.util.List;
  import java.util.Map;
  
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.http.HttpStatus;
  import org.springframework.http.ResponseEntity;
  import org.springframework.stereotype.Controller;
  import org.springframework.web.bind.annotation.PathVariable;
  import org.springframework.web.bind.annotation.RequestBody;
  import org.springframework.web.bind.annotation.RequestMapping;
  import org.springframework.web.bind.annotation.RequestMethod;
  import org.springframework.web.bind.annotation.RequestParam;
  import org.springframework.web.bind.annotation.ResponseBody;
  
  import com.impetus.ankush.common.domain.Template;
  import com.impetus.ankush.common.framework.ClusterPreValidator;
  import com.impetus.ankush.common.framework.TemplateManager;
  import com.impetus.ankush.common.service.UserManager;
  import com.impetus.ankush.common.utils.ResponseWrapper;
  import com.impetus.ankush2.framework.config.ClusterConfig;
  
  /**
   * The Class ClusterController.
   */
  @Controller
  @RequestMapping("/cluster")
  public class ClusterController extends BaseController {
  
  	/** The user manager. */
  	private UserManager userManager;
  
  	/**
  	 * Sets the user manager.
  	 * 
  	 * @param userManager
  	 *            the new user manager
  	 */
  	@Autowired
  	public void setUserManager(UserManager userManager) {
  		this.userManager = userManager;
  	}
  
  	/**
  	 * Creates the cluster.
  	 * 
  	 * @param clusterConf
  	 *            the cluster conf
  	 * @param technology
  	 *            the technology
  	 * @param principal
  	 *            the principal
  	 * @return the response entity
  	 * @throws Exception
  	 *             the exception
  	 */
  	@RequestMapping(method = RequestMethod.POST, value = "/redeploy/{clusterId}")
  	@ResponseBody
  	public ResponseEntity<ResponseWrapper<Object>> redeployCluster(
  			@RequestBody ClusterConfig clusterConfig,
  			@PathVariable Long clusterId, Principal principal) throws Exception {
  
  		logger.debug("Cluster redeploy request " + clusterConfig.getName()
  				+ " User " + principal.getName());
  
  		// Set the current user from the principal to clusterconf.
  		clusterConfig.setCreatedBy(principal.getName());
  		// Create Cluster
  
  		Object objectret = new com.impetus.ankush2.framework.manager.ClusterManager(
  				principal.getName()).redeploy(clusterId, clusterConfig);
  		return wrapResponse(objectret, HttpStatus.OK, HttpStatus.OK.toString(),
  				"Cluster creation activity in progress");
  	}
  
  	@RequestMapping(method = RequestMethod.POST, value = "/validate", headers = "Accept=application/json")
  	@ResponseBody
  	public ResponseEntity<ResponseWrapper<Map>> validate(
  			@RequestBody LinkedHashMap params) {
  
  		ClusterPreValidator validator = new ClusterPreValidator();
  		return wrapResponse(validator.validate(params), HttpStatus.OK,
  				HttpStatus.OK.toString(), "Cluster Validations");
  	}
  
  	/**
  	 * Template REST API to save/update the template.
  	 * 
  	 * @param template
  	 * @param update
  	 * @param principle
  	 * @return
  	 */
  	@RequestMapping(method = RequestMethod.POST, value = "/template", headers = "Accept=application/json")
  	@ResponseBody
  	public ResponseEntity<ResponseWrapper<Object>> saveTemplate(
  			@RequestBody Template template,
  			@RequestParam(required = false, defaultValue = "false") boolean update,
  			Principal principle) {
  		TemplateManager templateManager = new TemplateManager();
  		template.setUser(principle.getName());
  		Map map = templateManager.saveTemplate(template, update);
  		return wrapResponse((Object) map, HttpStatus.OK,
  				HttpStatus.OK.toString(), "Cluster Templates");
  	}
  
  	/**
  	 * Template REST API to template by name.
  	 * 
  	 * @param name
  	 * @return
  	 */
  	@RequestMapping(method = RequestMethod.GET, value = "/template", headers = "Accept=application/json")
  	@ResponseBody
  	public ResponseEntity<ResponseWrapper<Object>> getTemplate(
  			@RequestParam String name) {
  		TemplateManager templateManager = new TemplateManager();
  		Map map = templateManager.getTemplateMap(name);
  		return wrapResponse((Object) map, HttpStatus.OK,
  				HttpStatus.OK.toString(), "Cluster Templates");
  	}
  
  	/**
  	 * Template REST API to get templates by technology and user name.
  	 * 
  	 * @param technology
  	 * @param principal
  	 * @return
  	 */
  	@RequestMapping(method = RequestMethod.GET, value = "/templates")
  	@ResponseBody
  	public ResponseEntity<ResponseWrapper<List<Template>>> getTemplates(
  			@RequestParam(required = false, defaultValue = com.impetus.ankush2.constant.Constant.Keys.ALL) String technology) {
  
  		TemplateManager templateManager = new TemplateManager();
  		List<Template> templates;
  		if (technology.equals(com.impetus.ankush2.constant.Constant.Keys.ALL)) {
  			templates = templateManager.getAll();
  		} else {
  			templates = templateManager.getAll(technology);
  		}
  		return wrapResponse(templates, HttpStatus.OK, HttpStatus.OK.toString(),
  				"Cluster Templates");
  	}
  
  	/**
  	 * Template REST API to delete the template by name.
  	 * 
  	 * @param name
  	 * @return
  	 */
  	@RequestMapping(method = RequestMethod.DELETE, value = "/template")
  	@ResponseBody
  	public ResponseEntity<ResponseWrapper<HttpStatus>> deleteTemplate(
  			@RequestParam String name) {
  
  		TemplateManager templateManager = new TemplateManager();
  		templateManager.delete(name);
  		return wrapResponse(HttpStatus.OK, HttpStatus.OK,
  				HttpStatus.OK.toString(), "Cluster Templates");
  	}
  
  	@RequestMapping(method = RequestMethod.POST, value = "/create")
  	@ResponseBody
  	public ResponseEntity<ResponseWrapper<Object>> createNewCluster(
  			@RequestBody ClusterConfig clusterConfig, Principal principal)
  			throws Exception {
  
  		logger.debug("Cluster creation request " + clusterConfig.getName()
  				+ " User " + principal.getName());
  
  		// Set the current user from the principal to clusterconf.
  		clusterConfig.setCreatedBy(principal.getName());
  		// Create Cluster
  
  		com.impetus.ankush2.framework.manager.ClusterManager manager = new com.impetus.ankush2.framework.manager.ClusterManager(
  				principal.getName());
  		Object objectret = manager.deploy(clusterConfig);
  		return wrapResponse(objectret, HttpStatus.OK, HttpStatus.OK.toString(),
  				"Cluster creation activity in progress");
  	}
  
  	@RequestMapping(method = RequestMethod.POST, value = "{clusterId}/addnode")
  	@ResponseBody
  	public ResponseEntity<ResponseWrapper<Object>> addNodes(
  			@PathVariable("clusterId") Long clusterId,
  			@RequestBody ClusterConfig newclusterConfig, Principal principal)
  			throws Exception {
  
  		// Set the current user from the principal to clusterconf.
  		newclusterConfig.setCreatedBy(principal.getName());
  
  		// Add Nodes to Cluster
  		com.impetus.ankush2.framework.manager.ClusterManager manager = new com.impetus.ankush2.framework.manager.ClusterManager(principal.getName());
  		Object objectret = manager.addNodes(clusterId, newclusterConfig);
  		return wrapResponse(objectret, HttpStatus.OK, HttpStatus.OK.toString(),
  				"Node addition activity in progress");
  	}
  
  	@RequestMapping(method = RequestMethod.POST, value = "{clusterId}/removenode")
  	@ResponseBody
  	public ResponseEntity<ResponseWrapper<Object>> removeNodes(
  			@PathVariable("clusterId") Long clusterId,
  			@RequestBody Map<String, Object> parameterMap, Principal principal)
  			throws Exception {
  		String userName = principal.getName();
  		String error = "Given password doesn't match.You are not authorized to remove nodes.";
  		try {
  			if (parameterMap.get("password") == null
  					|| ((String) parameterMap.get("password")).isEmpty()) {
  				error = "Please provide a valid password to delete these nodes.";
  			} else {
  				if (userManager.doesPasswordMatch(userName,
  						parameterMap.get("password").toString())) {
  					// Remove Nodes from Cluster
  					com.impetus.ankush2.framework.manager.ClusterManager manager = new com.impetus.ankush2.framework.manager.ClusterManager(principal.getName());
  					Object objectret = manager.removeNodes(clusterId,
  							(List<String>) parameterMap.get("nodes"));
  					// Object objectret = null;
  					return wrapResponse(objectret, HttpStatus.OK,
  							HttpStatus.OK.toString(),
  							"Node removal activity in progress");
  				}
  			}
  		} catch (Exception e) {
  			error = e.getMessage() != null ? e.getMessage()
  					: "Couldn't remove node. ";
  		}
  