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// distributed with this work for additional information
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// 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
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// specific language governing permissions and limitations
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package org.apache.cloudstack.api.command.admin.systemvm;

import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

import org.apache.cloudstack.api.APICommand;
import org.apache.cloudstack.api.ApiConstants;
import org.apache.cloudstack.api.ApiErrorCode;
import org.apache.cloudstack.api.BaseCmd;
import org.apache.cloudstack.api.Parameter;
import org.apache.cloudstack.api.ServerApiException;
import org.apache.cloudstack.api.command.user.vm.UpgradeVMCmd;
import org.apache.cloudstack.api.response.ServiceOfferingResponse;
import org.apache.cloudstack.api.response.SystemVmResponse;
import org.apache.cloudstack.context.CallContext;
import org.apache.log4j.Logger;

import com.cloud.exception.InvalidParameterValueException;
import com.cloud.offering.ServiceOffering;
import com.cloud.user.Account;
import com.cloud.vm.VirtualMachine;

@APICommand(name = "changeServiceForSystemVm", responseObject = SystemVmResponse.class, description = "Changes the service offering for a system vm (console proxy or secondary storage). "
        + "The system vm must be in a \"Stopped\" state for " + "this command to take effect.")
public class UpgradeSystemVMCmd extends BaseCmd {
    public static final Logger s_logger = Logger.getLogger(UpgradeVMCmd.class.getName());
    private static final String s_name = "changeserviceforsystemvmresponse";

    /////////////////////////////////////////////////////
    //////////////// API parameters /////////////////////
    /////////////////////////////////////////////////////

    @Parameter(name = ApiConstants.ID, type = CommandType.UUID, entityType = SystemVmResponse.class, required = true, description = "The ID of the system vm")
    private Long id;

    @Parameter(name = ApiConstants.SERVICE_OFFERING_ID, type = CommandType.UUID, entityType = ServiceOfferingResponse.class, required = true, description = "the service offering ID to apply to the system vm")
    private Long serviceOfferingId;

    @Parameter(name = ApiConstants.DETAILS, type = CommandType.MAP, description = "name value pairs of custom parameters for cpu, memory and cpunumber. example details[i].name=value")
    private Map<String, String> details;

    /////////////////////////////////////////////////////
    /////////////////// Accessors ///////////////////////
    /////////////////////////////////////////////////////

    public Long getId() {
        return id;
    }

    public Long getServiceOfferingId() {
        return serviceOfferingId;
    }

    public Map<String, String> getDetails() {
        Map<String, String> customparameterMap = new HashMap<String, String>();
        if (details != null && details.size() != 0) {
            Collection parameterCollection = details.values();
            Iterator iter = parameterCollection.iterator();
            while (iter.hasNext()) {
                HashMap<String, String> value = (HashMap<String, String>)iter.next();
                for (String key : value.keySet()) {
                    customparameterMap.put(key, value.get(key));
                }
            }
        }
        return customparameterMap;
    }

    /////////////////////////////////////////////////////
    /////////////// API Implementation///////////////////
    /////////////////////////////////////////////////////

    @Override
    public String getCommandName() {
        return s_name;
    }

    @Override
    public long getEntityOwnerId() {
        Account account = CallContext.current().getCallingAccount();
        if (account != null) {
            return account.getId();
        }

        return Account.ACCOUNT_ID_SYSTEM; // no account info given, parent this command to SYSTEM so ERROR events are tracked
    }

    @Override
    public void execute() {
        CallContext.current().setEventDetails("Vm Id: " + getId());

        ServiceOffering serviceOffering = _entityMgr.findById(ServiceOffering.class, serviceOfferingId);
        if (serviceOffering == null) {
            throw new InvalidParameterValueException("Unable to find service offering: " + serviceOfferingId);
        }

        VirtualMachine result = _mgr.upgradeSystemVM(this);
        if (result != null) {
            SystemVmResponse response = _responseGenerator.createSystemVmResponse(result);
            response.setResponseName(getCommandName());
            setResponseObject(response);
        } else {
            throw new ServerApiException(ApiErrorCode.INTERNAL_ERROR, "Fail to reboot system vm");
        }
    }
}
