savingaccountbean.java

我在加拿大学习的一个比较复杂的在线银行程序.

package com.ebusiness.ebank.ejb.entitybean;

/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2005</p>
 * <p>Company: eBusiness Inc., All right reserved</p>
 * @author unascribed
 * @version 1.0
 */

import java.sql.Timestamp;
import javax.ejb.EntityBean;
import javax.ejb.CreateException;
import javax.ejb.EntityContext;

import com.ebusiness.ebank.bean.SavingAccountValue;
import com.ebusiness.ebank.exception.BusinessException;
//import com.ebusiness.ebank.exception.SystemException;
import com.ebusiness.ebank.exception.ErrorMessages;

abstract public class SavingAccountBean implements EntityBean
{
    private EntityContext ctx;

    abstract public Long getObjectID();
    abstract public void setObjectID(Long oid);
    abstract public String getAccountNo();
    abstract public void setAccountNo(String accountNo);
    abstract public String getAccountType();
    abstract public void setAccountType(String accountType);
    abstract public String getClientCardID();
    abstract public void setClientCardID(String clientCardID);
    abstract public int getAnnualFee();
    abstract public void setAnnualFee(int annualFee);
    abstract public int getMinimumBalance();
    abstract public void setMinimumBalance(int minimumBalance);
    abstract public int getFreeServiceLimit();
    abstract public void setFreeServiceLimit(int freeServiceLimit);
    abstract public int getFixedServiceFee();
    abstract public void setFixedServiceFee(int fixedServiceFee);
    abstract public double getInterestRate();
    abstract public void setInterestRate(double interestRate);
    abstract public double getBalance();
    abstract public void setBalance(double balance);

    abstract public Timestamp getEffectiveDate();
    abstract public void setEffectiveDate(Timestamp effectiveDate);
    abstract public Timestamp getExpiryDate();
    abstract public void setExpiryDate(Timestamp expiryDate);

    abstract public String getCreateUserID();
    abstract public void setCreateUserID(String createUserID);
    abstract public Timestamp getCreateDate();
    abstract public void setCreateDate(Timestamp createDate);
    abstract public String getUpdateUserID();
    abstract public void setUpdateUserID(String updateUserID);
    abstract public Timestamp getUpdateDate();
    abstract public void setUpdateDate(Timestamp expiryDate);
    abstract public String getStatus();
    abstract public void setStatus(String status);
    abstract public String getAction();
    abstract public void setAction(String action);

    // Business methods

    public long getAccountOID()
    {
        return this.getObjectID().longValue();
    }
    /**
     * Parse the entity bean value to ChequingAccountValue object
     *
     * @return ChequingAccountValue
     */
    public SavingAccountValue getValueObject()
    {
        SavingAccountValue value = new SavingAccountValue();
        value.setObjectID(this.getObjectID().longValue());
        value.setAccountNo(this.getAccountNo());
        value.setAccountType(this.getAccountType());
        value.setClientCardID(this.getClientCardID());
        value.setAnnualFee(this.getAnnualFee());
        value.setMinimumBalance(this.getMinimumBalance());
        value.setFreeServiceLimit(this.getFreeServiceLimit());
        value.setFixedServiceFee(this.getFixedServiceFee());
        value.setInterestRate(this.getInterestRate());
        value.setBalance(this.getBalance());
        value.setStatus(this.getStatus());

        //common values
        value.setEffectiveDate(this.getEffectiveDate());
        value.setExpiryDate(this.getExpiryDate());
        value.setCreateUserID(this.getCreateUserID());
        value.setCreateDate(this.getCreateDate());
        value.setUpdateUserID(this.getUpdateUserID());
        value.setUpdateDate(this.getUpdateDate());
        value.setAction(this.getAction());
        return value;
    }

    //deposit money from the account
    public void deposit(double amount) throws BusinessException
    {
        if (!"V".equals(this.getStatus())) //the account is not Valid
           throw new BusinessException(ErrorMessages.INVALID_ACCOUNT);
        this.setBalance(this.getBalance() + amount);
    }

    //withdrawal money from the account
    public void withdrawal(double amount) throws BusinessException
    {
        if (!"V".equals(this.getStatus())) //the account is not Valid
           throw new BusinessException(ErrorMessages.INVALID_ACCOUNT);
        double newBalance = this.getBalance() - amount;
        if (newBalance < this.getMinimumBalance())
           throw new BusinessException(ErrorMessages.EXCEED_LIMIT);
        this.setBalance(newBalance);
    }


    /**
     * Update VisaAccount
     *
     * @param value :    ChequingAccountValue
     * @return      :    updated ChequingAccountValue
     */
    public SavingAccountValue update(SavingAccountValue value)
    {
        this.setAnnualFee(value.getAnnualFee());
        this.setMinimumBalance(value.getMinimumBalance());
        this.setFreeServiceLimit(value.getFreeServiceLimit());
        this.setFixedServiceFee(value.getFixedServiceFee());
        this.setInterestRate(value.getInterestRate());
        this.setBalance(value.getBalance());

        //common values
        this.setEffectiveDate(new Timestamp(value.getEffectiveDate().getTime()));
        this.setExpiryDate(new Timestamp(value.getExpiryDate().getTime()));

        String userID = this.ctx.getCallerPrincipal().getName();
        this.setUpdateUserID(userID);

        return this.getValueObject();
    }

    // Framework and lifecycle methods

    //This method will insert a record to the Chequing_Account table.
    public Long ejbCreate(SavingAccountValue value)
         throws CreateException
    {
        this.setAccountNo(value.getAccountNo());
        this.setAccountType(value.getAccountType());
        this.setClientCardID(value.getClientCardID());
        this.setAnnualFee(value.getAnnualFee());
        this.setMinimumBalance(value.getMinimumBalance());
        this.setFreeServiceLimit(value.getFreeServiceLimit());
        this.setFixedServiceFee(value.getFixedServiceFee());
        this.setInterestRate(value.getInterestRate());
        this.setBalance(value.getBalance());
        //common values
        this.setEffectiveDate(new Timestamp(value.getEffectiveDate().getTime()));
        this.setExpiryDate(new Timestamp(value.getExpiryDate().getTime()));

        String userID = this.ctx.getCallerPrincipal().getName();

        this.setCreateUserID(userID);
        this.setUpdateUserID(userID);
        this.setStatus(value.getStatus());

        return null; //for container managed persistence
    }

    public void ejbPostCreate(SavingAccountValue value) {}

    public void ejbActivate() {}

    public void ejbLoad() {}

    public void ejbPassivate() {}

    public void ejbRemove() //this method will delete the record from database
    {
        //Log.info("An Acocunt with ID = " + "" + " is being deleted from database");
    }

    public void ejbStore() {}

    public void setEntityContext(EntityContext ctx)
    {
        this.ctx = ctx;
    }

    public void unsetEntityContext() {}
}