daofactory.java

来自「Struts+Hibernate网络购物系统」· Java 代码 · 共 51 行

package com.netshop.domain.dao;

public abstract class DAOFactory {

    private static Object initLock = new Object();

    private static String className = "com.netshop.domain.dao.hibernate.HibernateDAOFactory";

    private static DAOFactory factory = null;

    public static DAOFactory getInstance() {
        if (factory == null) {
            synchronized (initLock) {
                if (factory == null) {
                    // Note, the software license expressely forbids
                    // tampering with this check.
                    //LicenseManager.validateLicense("Jive Forums Basic",
                    // "2.0");

                    String classNameProp = DAOConfig
                            .getProperty("DAOFactory.className");
                    if (classNameProp != null) {
                        className = classNameProp;
                    }
                    try {
                        //Load the class and create an instance.
                        Class c = Class.forName(className);
                        factory = (DAOFactory) c.newInstance();
                    } catch (Exception e) {
                        System.err.println("Failed to load DAOFactory class "
                                + className
                                + ". DigitStore cannot function normally.");
                        e.printStackTrace();
                        return null;
                    }
                }
            }
        }
        return factory;
    }

    public abstract UserinfoDao createAccountDAO();

    public abstract CategoryDao createCategoryDAO();

    public abstract ItemDao createItemDAO();

    public abstract OrderDao createOrderDAO();

    public abstract ProductDao createProductDAO();
}