server/src/com/cloud/api/ApiDispatcher.java - cloudstack - Git at Google

 /**
  *  Copyright (C) 2010 Cloud.com, Inc.  All rights reserved.
  *
  * This software is licensed under the GNU General Public License v3 or later.
  *
  * It is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or any later version.
  * This program 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 General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  *
  */
 package com.cloud.api;

 import java.lang.reflect.Field;
 import java.text.DateFormat;
 import java.text.ParseException;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;
 import java.util.StringTokenizer;

 import org.apache.log4j.Logger;

 import com.cloud.api.BaseCmd.CommandType;
 import com.cloud.async.AsyncCommandQueued;
 import com.cloud.async.AsyncJobManager;
 import com.cloud.exception.AccountLimitException;
 import com.cloud.exception.InsufficientCapacityException;
 import com.cloud.exception.InvalidParameterValueException;
 import com.cloud.exception.PermissionDeniedException;
 import com.cloud.exception.ResourceAllocationException;
 import com.cloud.exception.ResourceUnavailableException;
 import com.cloud.server.ManagementServer;
 import com.cloud.user.Account;
 import com.cloud.user.UserContext;
 import com.cloud.utils.DateUtil;
 import com.cloud.utils.component.ComponentLocator;
 import com.cloud.utils.exception.CloudRuntimeException;

 /**
  * A class that dispatches API commands to the appropriate manager for execution.
  */
 public class ApiDispatcher {
     private static final Logger s_logger = Logger.getLogger(ApiDispatcher.class.getName());

     ComponentLocator _locator;
     AsyncJobManager _asyncMgr;

     // singleton class
     private static ApiDispatcher s_instance = new ApiDispatcher();

     public static ApiDispatcher getInstance() {
         return s_instance;
     }

     private ApiDispatcher() {
         _locator = ComponentLocator.getLocator(ManagementServer.Name);
         _asyncMgr = _locator.getManager(AsyncJobManager.class);
     }

     public void dispatchCreateCmd(BaseAsyncCreateCmd cmd, Map<String, String> params) {

         String errorMsg = "";
         setupParameters(cmd, params);

         try {
             UserContext ctx = UserContext.current();
             ctx.setAccountId(cmd.getEntityOwnerId());
             cmd.create();
         } catch (Throwable t) {
             if (t instanceof  InvalidParameterValueException || t instanceof IllegalArgumentException) {
                 s_logger.info(t.getMessage());
                 errorMsg = "Parameter error";
                 throw new ServerApiException(BaseCmd.PARAM_ERROR, t.getMessage());
             } else if (t instanceof PermissionDeniedException) {
                 s_logger.info("PermissionDenied: " + t.getMessage());
                 errorMsg = "Permission denied";
                 throw new ServerApiException(BaseCmd.ACCOUNT_ERROR, t.getMessage());
             } else if (t instanceof AccountLimitException) {
                 s_logger.info(t.getMessage());
                 errorMsg = "Account resource limit error";
                 throw new ServerApiException(BaseCmd.ACCOUNT_RESOURCE_LIMIT_ERROR, t.getMessage());
             }else if (t instanceof InsufficientCapacityException) {
                 s_logger.info(t.getMessage());
                 errorMsg = "Insufficient capacity";
                 throw new ServerApiException(BaseCmd.INSUFFICIENT_CAPACITY_ERROR, t.getMessage());
             } else if (t instanceof ResourceAllocationException) {
                 s_logger.info(t.getMessage());
                 errorMsg = "Resource allocation error";
                 throw new ServerApiException(BaseCmd.RESOURCE_ALLOCATION_ERROR, t.getMessage());
             } else if (t instanceof ResourceUnavailableException) {
                 s_logger.warn("Exception: ", t);
                 errorMsg = "Resource unavailable error";
                 throw new ServerApiException(BaseCmd.RESOURCE_UNAVAILABLE_ERROR, t.getMessage());
             } else if (t instanceof AsyncCommandQueued) {
                 throw (AsyncCommandQueued)t;
             } else if (t instanceof ServerApiException) {
                 s_logger.warn(t.getClass() + " : " + ((ServerApiException) t).getDescription());
                 errorMsg = ((ServerApiException) t).getDescription();
                 if (UserContext.current().getCaller().getType() == Account.ACCOUNT_TYPE_ADMIN) {
                     throw new ServerApiException(BaseCmd.INTERNAL_ERROR, errorMsg.length() > 0 ? errorMsg : ((ServerApiException) t).getDescription());
                 } else {
                     throw new ServerApiException(BaseCmd.INTERNAL_ERROR, BaseCmd.USER_ERROR_MESSAGE);
                 }
             } else {
                 errorMsg = "Internal error";
                 s_logger.error("Exception while executing " + cmd.getClass().getSimpleName() + ":", t);
                 if (UserContext.current().getCaller().getType() == Account.ACCOUNT_TYPE_ADMIN) {
                     throw new ServerApiException(BaseCmd.INTERNAL_ERROR, t.getMessage());
                 } else {
                     throw new ServerApiException(BaseCmd.INTERNAL_ERROR, BaseCmd.USER_ERROR_MESSAGE);
                 }
             }
         }
     }

     public void dispatch(BaseCmd cmd, Map<String, String> params) {
         String errorMsg = "";
         setupParameters(cmd, params);
         try {
             if(cmd instanceof BaseAsyncCmd){
                 UserContext ctx = UserContext.current();
                 BaseAsyncCmd asyncCmd = (BaseAsyncCmd)cmd;
                 ctx.setAccountId(asyncCmd.getEntityOwnerId());
                 String startEventId = params.get("ctxStartEventId");
                 ctx.setStartEventId(Long.valueOf(startEventId));

                 //Synchronise job on the object if needed
                 if (asyncCmd.getJob() != null && asyncCmd.getSyncObjId() != null && asyncCmd.getSyncObjType() != null) {
                     _asyncMgr.syncAsyncJobExecution(asyncCmd.getJob(), asyncCmd.getSyncObjType(), asyncCmd.getSyncObjId().longValue());
                 }
             }

             cmd.execute();

         } catch (Throwable t) {
             if (t instanceof  InvalidParameterValueException || t instanceof IllegalArgumentException) {
                 s_logger.info(t.getMessage());
                 errorMsg = "Parameter error";
                 throw new ServerApiException(BaseCmd.PARAM_ERROR, t.getMessage());
             } else if (t instanceof PermissionDeniedException) {
                 s_logger.info("PermissionDenied: " + t.getMessage());
                 errorMsg = "Permission denied";
                 throw new ServerApiException(BaseCmd.ACCOUNT_ERROR, t.getMessage());
             } else if (t instanceof AccountLimitException) {
                 s_logger.info(t.getMessage());
                 errorMsg = "Account resource limit error";
                 throw new ServerApiException(BaseCmd.ACCOUNT_RESOURCE_LIMIT_ERROR, t.getMessage());
             } else if (t instanceof InsufficientCapacityException) {
                 s_logger.info(t.getMessage());
                 errorMsg = "Insufficient capacity";
                 throw new ServerApiException(BaseCmd.INSUFFICIENT_CAPACITY_ERROR, t.getMessage());
             } else if (t instanceof ResourceAllocationException) {
                 s_logger.warn("Exception: ", t);
                 errorMsg = "Resource allocation error";
                 throw new ServerApiException(BaseCmd.RESOURCE_ALLOCATION_ERROR, t.getMessage());
             } else if (t instanceof ResourceUnavailableException) {
                 s_logger.warn("Exception: ", t);
                 errorMsg = "Resource unavailable error";
                 throw new ServerApiException(BaseCmd.RESOURCE_UNAVAILABLE_ERROR, t.getMessage());
             } else if (t instanceof AsyncCommandQueued) {
                 throw (AsyncCommandQueued)t;
             } else if (t instanceof ServerApiException) {
                 errorMsg = ((ServerApiException) t).getDescription();
                 s_logger.warn(t.getClass()  + " : " + ((ServerApiException) t).getDescription());
                 if (UserContext.current().getCaller().getType() == Account.ACCOUNT_TYPE_ADMIN) {
                     throw new ServerApiException(BaseCmd.INTERNAL_ERROR, errorMsg);
                 } else {
                     throw new ServerApiException(BaseCmd.INTERNAL_ERROR, BaseCmd.USER_ERROR_MESSAGE);
                 }
             } else {
                 errorMsg = "Internal error";
                 s_logger.error("Exception while executing " + cmd.getClass().getSimpleName() + ":", t);
                 if (UserContext.current().getCaller().getType() == Account.ACCOUNT_TYPE_ADMIN) {
                     throw new ServerApiException(BaseCmd.INTERNAL_ERROR, t.getMessage());
                 } else {
                     throw new ServerApiException(BaseCmd.INTERNAL_ERROR, BaseCmd.USER_ERROR_MESSAGE);
                 }
             }
         }
     }

     public static void setupParameters(BaseCmd cmd, Map<String, String> params){
         Map<String, Object> unpackedParams = cmd.unpackParams(params);

         if (cmd instanceof BaseListCmd) {
             if ((unpackedParams.get(ApiConstants.PAGE) == null) && (unpackedParams.get(ApiConstants.PAGE_SIZE) != null)) {
                 throw new ServerApiException(BaseCmd.PARAM_ERROR, "\"page\" parameter is required when \"pagesize\" is specified");
             } else if ((unpackedParams.get(ApiConstants.PAGE_SIZE) == null) && (unpackedParams.get(ApiConstants.PAGE) != null)) {
                 throw new ServerApiException(BaseCmd.PARAM_ERROR, "\"pagesize\" parameter is required when \"page\" is specified");
             }
         }

         Field[] fields = cmd.getClass().getDeclaredFields();
         Class<?> superClass = cmd.getClass().getSuperclass();
         while (BaseCmd.class.isAssignableFrom(superClass)) {
             Field[] superClassFields = superClass.getDeclaredFields();
             if (superClassFields != null) {
                 Field[] tmpFields = new Field[fields.length + superClassFields.length];
                 System.arraycopy(fields, 0, tmpFields, 0, fields.length);
                 System.arraycopy(superClassFields, 0, tmpFields, fields.length, superClassFields.length);
                 fields = tmpFields;
             }
             superClass = superClass.getSuperclass();
         }

         for (Field field : fields) {
             Parameter parameterAnnotation = field.getAnnotation(Parameter.class);
             if ((parameterAnnotation == null) || !parameterAnnotation.expose()) {
                 continue;
             }

             Object paramObj = unpackedParams.get(parameterAnnotation.name());
             if (paramObj == null) {
                 if (parameterAnnotation.required()) {
                     throw new ServerApiException(BaseCmd.PARAM_ERROR, "Unable to execute API command " + cmd.getCommandName() + " due to missing parameter " + parameterAnnotation.name());
                 }
                 continue;
             }

             // marshall the parameter into the correct type and set the field value
             try {
                 setFieldValue(field, cmd, paramObj, parameterAnnotation);
             } catch (IllegalArgumentException argEx) {
                 if (s_logger.isDebugEnabled()) {
                     s_logger.debug("Unable to execute API command " + cmd.getCommandName() + " due to invalid value " + paramObj + " for parameter " + parameterAnnotation.name());
                 }
                 throw new ServerApiException(BaseCmd.PARAM_ERROR, "Unable to execute API command " + cmd.getCommandName() + " due to invalid value " + paramObj + " for parameter " + parameterAnnotation.name());
             } catch (ParseException parseEx) {
                 if (s_logger.isDebugEnabled()) {
                     s_logger.debug("Invalid date parameter " + paramObj + " passed to command " + cmd.getCommandName());
                 }
                 throw new ServerApiException(BaseCmd.PARAM_ERROR, "Unable to parse date " + paramObj + " for command " + cmd.getCommandName() + ", please pass dates in the format yyyy-MM-dd");
             } catch (CloudRuntimeException cloudEx) {
                 // FIXME: Better error message? This only happens if the API command is not executable, which typically means
                 // there was
                 // and IllegalAccessException setting one of the parameters.
                 throw new ServerApiException(BaseCmd.INTERNAL_ERROR, "Internal error executing API command " + cmd.getCommandName());
             }
         }
     }

     @SuppressWarnings({ "unchecked", "rawtypes" })
     private static void setFieldValue(Field field, BaseCmd cmdObj, Object paramObj, Parameter annotation) throws IllegalArgumentException, ParseException {
         try {
             field.setAccessible(true);
             CommandType fieldType = annotation.type();
             switch (fieldType) {
             case BOOLEAN:
                 field.set(cmdObj, Boolean.valueOf(paramObj.toString()));
                 break;
             case DATE:
                 DateFormat format = BaseCmd.INPUT_FORMAT;
                 synchronized (format) {
                     field.set(cmdObj, format.parse(paramObj.toString()));
                 }
                 break;
             case FLOAT:
                 field.set(cmdObj, Float.valueOf(paramObj.toString()));
                 break;
             case INTEGER:
                 field.set(cmdObj, Integer.valueOf(paramObj.toString()));
                 break;
             case LIST:
                 List listParam = new ArrayList();
                 StringTokenizer st = new StringTokenizer(paramObj.toString(), ",");
                 while (st.hasMoreTokens()) {
                     String token = st.nextToken();
                     CommandType listType = annotation.collectionType();
                     switch (listType) {
                     case INTEGER:
                         listParam.add(Integer.valueOf(token));
                         break;
                     case LONG:
                         listParam.add(Long.valueOf(token));
                         break;
                     case STRING:
                         listParam.add(token);
                         break;
                     }
                 }
                 field.set(cmdObj, listParam);
                 break;
             case LONG:
                 field.set(cmdObj, Long.valueOf(paramObj.toString()));
                 break;
             case STRING:
                 field.set(cmdObj, paramObj.toString());
                 break;
             case TZDATE:
                 field.set(cmdObj, DateUtil.parseTZDateString(paramObj.toString()));
                 break;
             case MAP:
             default:
                 field.set(cmdObj, paramObj);
                 break;
             }
         } catch (IllegalAccessException ex) {
             s_logger.error("Error initializing command " + cmdObj.getCommandName() + ", field " + field.getName() + " is not accessible.");
             throw new CloudRuntimeException("Internal error initializing parameters for command " + cmdObj.getCommandName() + " [field " + field.getName() + " is not accessible]");
         }
     }
 }
	/**
	* Copyright (C) 2010 Cloud.com, Inc. All rights reserved.
	*
	* This software is licensed under the GNU General Public License v3 or later.
	*
	* It is free software: you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation, either version 3 of the License, or any later version.
	* This program 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 General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	*
	*/
	package com.cloud.api;

	import java.lang.reflect.Field;
	import java.text.DateFormat;
	import java.text.ParseException;
	import java.util.ArrayList;
	import java.util.List;
	import java.util.Map;
	import java.util.StringTokenizer;

	import org.apache.log4j.Logger;

	import com.cloud.api.BaseCmd.CommandType;
	import com.cloud.async.AsyncCommandQueued;
	import com.cloud.async.AsyncJobManager;
	import com.cloud.exception.AccountLimitException;
	import com.cloud.exception.InsufficientCapacityException;
	import com.cloud.exception.InvalidParameterValueException;
	import com.cloud.exception.PermissionDeniedException;
	import com.cloud.exception.ResourceAllocationException;
	import com.cloud.exception.ResourceUnavailableException;
	import com.cloud.server.ManagementServer;
	import com.cloud.user.Account;
	import com.cloud.user.UserContext;
	import com.cloud.utils.DateUtil;
	import com.cloud.utils.component.ComponentLocator;
	import com.cloud.utils.exception.CloudRuntimeException;

	/**
	* A class that dispatches API commands to the appropriate manager for execution.
	*/
	public class ApiDispatcher {
	private static final Logger s_logger = Logger.getLogger(ApiDispatcher.class.getName());

	ComponentLocator _locator;
	AsyncJobManager _asyncMgr;

	// singleton class
	private static ApiDispatcher s_instance = new ApiDispatcher();

	public static ApiDispatcher getInstance() {
	return s_instance;
	}

	private ApiDispatcher() {
	_locator = ComponentLocator.getLocator(ManagementServer.Name);
	_asyncMgr = _locator.getManager(AsyncJobManager.class);
	}

	public void dispatchCreateCmd(BaseAsyncCreateCmd cmd, Map<String, String> params) {

	String errorMsg = "";
	setupParameters(cmd, params);

	try {
	UserContext ctx = UserContext.current();
	ctx.setAccountId(cmd.getEntityOwnerId());
	cmd.create();
	} catch (Throwable t) {
	if (t instanceof InvalidParameterValueException \|\| t instanceof IllegalArgumentException) {
	s_logger.info(t.getMessage());
	errorMsg = "Parameter error";
	throw new ServerApiException(BaseCmd.PARAM_ERROR, t.getMessage());
	} else if (t instanceof PermissionDeniedException) {
	s_logger.info("PermissionDenied: " + t.getMessage());
	errorMsg = "Permission denied";
	throw new ServerApiException(BaseCmd.ACCOUNT_ERROR, t.getMessage());
	} else if (t instanceof AccountLimitException) {
	s_logger.info(t.getMessage());
	errorMsg = "Account resource limit error";
	throw new ServerApiException(BaseCmd.ACCOUNT_RESOURCE_LIMIT_ERROR, t.getMessage());
	}else if (t instanceof InsufficientCapacityException) {
	s_logger.info(t.getMessage());
	errorMsg = "Insufficient capacity";
	throw new ServerApiException(BaseCmd.INSUFFICIENT_CAPACITY_ERROR, t.getMessage());
	} else if (t instanceof ResourceAllocationException) {
	s_logger.info(t.getMessage());
	errorMsg = "Resource allocation error";
	throw new ServerApiException(BaseCmd.RESOURCE_ALLOCATION_ERROR, t.getMessage());
	} else if (t instanceof ResourceUnavailableException) {
	s_logger.warn("Exception: ", t);
	errorMsg = "Resource unavailable error";
	throw new ServerApiException(BaseCmd.RESOURCE_UNAVAILABLE_ERROR, t.getMessage());
	} else if (t instanceof AsyncCommandQueued) {
	throw (AsyncCommandQueued)t;
	} else if (t instanceof ServerApiException) {
	s_logger.warn(t.getClass() + " : " + ((ServerApiException) t).getDescription());
	errorMsg = ((ServerApiException) t).getDescription();
	if (UserContext.current().getCaller().getType() == Account.ACCOUNT_TYPE_ADMIN) {
	throw new ServerApiException(BaseCmd.INTERNAL_ERROR, errorMsg.length() > 0 ? errorMsg : ((ServerApiException) t).getDescription());
	} else {
	throw new ServerApiException(BaseCmd.INTERNAL_ERROR, BaseCmd.USER_ERROR_MESSAGE);
	}
	} else {
	errorMsg = "Internal error";
	s_logger.error("Exception while executing " + cmd.getClass().getSimpleName() + ":", t);
	if (UserContext.current().getCaller().getType() == Account.ACCOUNT_TYPE_ADMIN) {
	throw new ServerApiException(BaseCmd.INTERNAL_ERROR, t.getMessage());
	} else {
	throw new ServerApiException(BaseCmd.INTERNAL_ERROR, BaseCmd.USER_ERROR_MESSAGE);
	}
	}
	}
	}

	public void dispatch(BaseCmd cmd, Map<String, String> params) {
	String errorMsg = "";
	setupParameters(cmd, params);
	try {
	if(cmd instanceof BaseAsyncCmd){
	UserContext ctx = UserContext.current();
	BaseAsyncCmd asyncCmd = (BaseAsyncCmd)cmd;
	ctx.setAccountId(asyncCmd.getEntityOwnerId());
	String startEventId = params.get("ctxStartEventId");
	ctx.setStartEventId(Long.valueOf(startEventId));

	//Synchronise job on the object if needed
	if (asyncCmd.getJob() != null && asyncCmd.getSyncObjId() != null && asyncCmd.getSyncObjType() != null) {
	_asyncMgr.syncAsyncJobExecution(asyncCmd.getJob(), asyncCmd.getSyncObjType(), asyncCmd.getSyncObjId().longValue());
	}
	}

	cmd.execute();

	} catch (Throwable t) {
	if (t instanceof InvalidParameterValueException \|\| t instanceof IllegalArgumentException) {
	s_logger.info(t.getMessage());
	errorMsg = "Parameter error";
	throw new ServerApiException(BaseCmd.PARAM_ERROR, t.getMessage());
	} else if (t instanceof PermissionDeniedException) {
	s_logger.info("PermissionDenied: " + t.getMessage());
	errorMsg = "Permission denied";
	throw new ServerApiException(BaseCmd.ACCOUNT_ERROR, t.getMessage());
	} else if (t instanceof AccountLimitException) {
	s_logger.info(t.getMessage());
	errorMsg = "Account resource limit error";
	throw new ServerApiException(BaseCmd.ACCOUNT_RESOURCE_LIMIT_ERROR, t.getMessage());
	} else if (t instanceof InsufficientCapacityException) {
	s_logger.info(t.getMessage());
	errorMsg = "Insufficient capacity";
	throw new ServerApiException(BaseCmd.INSUFFICIENT_CAPACITY_ERROR, t.getMessage());
	} else if (t instanceof ResourceAllocationException) {
	s_logger.warn("Exception: ", t);
	errorMsg = "Resource allocation error";
	throw new ServerApiException(BaseCmd.RESOURCE_ALLOCATION_ERROR, t.getMessage());
	} else if (t instanceof ResourceUnavailableException) {
	s_logger.warn("Exception: ", t);
	errorMsg = "Resource unavailable error";
	throw new ServerApiException(BaseCmd.RESOURCE_UNAVAILABLE_ERROR, t.getMessage());
	} else if (t instanceof AsyncCommandQueued) {
	throw (AsyncCommandQueued)t;
	} else if (t instanceof ServerApiException) {
	errorMsg = ((ServerApiException) t).getDescription();
	s_logger.warn(t.getClass() + " : " + ((ServerApiException) t).getDescription());
	if (UserContext.current().getCaller().getType() == Account.ACCOUNT_TYPE_ADMIN) {
	throw new ServerApiException(BaseCmd.INTERNAL_ERROR, errorMsg);
	} else {
	throw new ServerApiException(BaseCmd.INTERNAL_ERROR, BaseCmd.USER_ERROR_MESSAGE);
	}
	} else {
	errorMsg = "Internal error";
	s_logger.error("Exception while executing " + cmd.getClass().getSimpleName() + ":", t);
	if (UserContext.current().getCaller().getType() == Account.ACCOUNT_TYPE_ADMIN) {
	throw new ServerApiException(BaseCmd.INTERNAL_ERROR, t.getMessage());
	} else {
	throw new ServerApiException(BaseCmd.INTERNAL_ERROR, BaseCmd.USER_ERROR_MESSAGE);
	}
	}
	}
	}

	public static void setupParameters(BaseCmd cmd, Map<String, String> params){
	Map<String, Object> unpackedParams = cmd.unpackParams(params);

	if (cmd instanceof BaseListCmd) {
	if ((unpackedParams.get(ApiConstants.PAGE) == null) && (unpackedParams.get(ApiConstants.PAGE_SIZE) != null)) {
	throw new ServerApiException(BaseCmd.PARAM_ERROR, "\"page\" parameter is required when \"pagesize\" is specified");
	} else if ((unpackedParams.get(ApiConstants.PAGE_SIZE) == null) && (unpackedParams.get(ApiConstants.PAGE) != null)) {
	throw new ServerApiException(BaseCmd.PARAM_ERROR, "\"pagesize\" parameter is required when \"page\" is specified");
	}
	}

	Field[] fields = cmd.getClass().getDeclaredFields();
	Class<?> superClass = cmd.getClass().getSuperclass();
	while (BaseCmd.class.isAssignableFrom(superClass)) {
	Field[] superClassFields = superClass.getDeclaredFields();
	if (superClassFields != null) {
	Field[] tmpFields = new Field[fields.length + superClassFields.length];
	System.arraycopy(fields, 0, tmpFields, 0, fields.length);
	System.arraycopy(superClassFields, 0, tmpFields, fields.length, superClassFields.length);
	fields = tmpFields;
	}
	superClass = superClass.getSuperclass();
	}

	for (Field field : fields) {
	Parameter parameterAnnotation = field.getAnnotation(Parameter.class);
	if ((parameterAnnotation == null) \|\| !parameterAnnotation.expose()) {
	continue;
	}

	Object paramObj = unpackedParams.get(parameterAnnotation.name());
	if (paramObj == null) {
	if (parameterAnnotation.required()) {
	throw new ServerApiException(BaseCmd.PARAM_ERROR, "Unable to execute API command " + cmd.getCommandName() + " due to missing parameter " + parameterAnnotation.name());
	}
	continue;
	}

	// marshall the parameter into the correct type and set the field value
	try {
	setFieldValue(field, cmd, paramObj, parameterAnnotation);
	} catch (IllegalArgumentException argEx) {
	if (s_logger.isDebugEnabled()) {
	s_logger.debug("Unable to execute API command " + cmd.getCommandName() + " due to invalid value " + paramObj + " for parameter " + parameterAnnotation.name());
	}
	throw new ServerApiException(BaseCmd.PARAM_ERROR, "Unable to execute API command " + cmd.getCommandName() + " due to invalid value " + paramObj + " for parameter " + parameterAnnotation.name());
	} catch (ParseException parseEx) {
	if (s_logger.isDebugEnabled()) {
	s_logger.debug("Invalid date parameter " + paramObj + " passed to command " + cmd.getCommandName());
	}
	throw new ServerApiException(BaseCmd.PARAM_ERROR, "Unable to parse date " + paramObj + " for command " + cmd.getCommandName() + ", please pass dates in the format yyyy-MM-dd");
	} catch (CloudRuntimeException cloudEx) {
	// FIXME: Better error message? This only happens if the API command is not executable, which typically means
	// there was
	// and IllegalAccessException setting one of the parameters.
	throw new ServerApiException(BaseCmd.INTERNAL_ERROR, "Internal error executing API command " + cmd.getCommandName());
	}
	}
	}

	@SuppressWarnings({ "unchecked", "rawtypes" })
	private static void setFieldValue(Field field, BaseCmd cmdObj, Object paramObj, Parameter annotation) throws IllegalArgumentException, ParseException {
	try {
	field.setAccessible(true);
	CommandType fieldType = annotation.type();
	switch (fieldType) {
	case BOOLEAN:
	field.set(cmdObj, Boolean.valueOf(paramObj.toString()));
	break;
	case DATE:
	DateFormat format = BaseCmd.INPUT_FORMAT;
	synchronized (format) {
	field.set(cmdObj, format.parse(paramObj.toString()));
	}
	break;
	case FLOAT:
	field.set(cmdObj, Float.valueOf(paramObj.toString()));
	break;
	case INTEGER:
	field.set(cmdObj, Integer.valueOf(paramObj.toString()));
	break;
	case LIST:
	List listParam = new ArrayList();
	StringTokenizer st = new StringTokenizer(paramObj.toString(), ",");
	while (st.hasMoreTokens()) {
	String token = st.nextToken();
	CommandType listType = annotation.collectionType();
	switch (listType) {
	case INTEGER:
	listParam.add(Integer.valueOf(token));
	break;
	case LONG:
	listParam.add(Long.valueOf(token));
	break;
	case STRING:
	listParam.add(token);
	break;
	}
	}
	field.set(cmdObj, listParam);
	break;
	case LONG:
	field.set(cmdObj, Long.valueOf(paramObj.toString()));
	break;
	case STRING:
	field.set(cmdObj, paramObj.toString());
	break;
	case TZDATE:
	field.set(cmdObj, DateUtil.parseTZDateString(paramObj.toString()));
	break;
	case MAP:
	default:
	field.set(cmdObj, paramObj);
	break;
	}
	} catch (IllegalAccessException ex) {
	s_logger.error("Error initializing command " + cmdObj.getCommandName() + ", field " + field.getName() + " is not accessible.");
	throw new CloudRuntimeException("Internal error initializing parameters for command " + cmdObj.getCommandName() + " [field " + field.getName() + " is not accessible]");
	}
	}
	}