枚举
public class Test {
public static void main(String[] args) {
System.out.println(judge("ROLE_ROOT_ADMIN"));
}
public static String judge(String roleName){
return RoleEnum.valueOf(roleName).operation();
}
}
interface RoleOperation {
String operation();
}
enum RoleEnum implements RoleOperation {
ROLE_ROOT_ADMIN {
@Override
public String operation() {
return "root";
}
},
ROLE_ORDER_ADMIN {
@Override
public String operation() {
return "order";
}
},
ROLE_NORMAL_ADMIN {
@Override
public String operation() {
return "normal";
}
};
}
工厂模式
import java.util.HashMap;
import java.util.Map;
public class Test {
public static void main(String[] args) {
System.out.println(judge("ROLE_ROOT_ADMIN"));
}
public static String judge(String roleName) {
return RoleFactory.getOperation(roleName).operation();
}
}
interface RoleOperation {
String operation();
}
class RoleFactory {
static Map<String, RoleOperation> roleOperationMap = new HashMap<>();
static {
roleOperationMap.put("ROLE_ROOT_ADMIN", new RootAdminRole("ROLE_ROOT_ADMIN"));
roleOperationMap.put("ROLE_ORDER_ADMIN", new RootAdminRole("ROLE_ORDER_ADMIN"));
roleOperationMap.put("ROLE_NORMAL_ADMIN", new RootAdminRole("ROLE_NORMAL_ADMIN"));
}
public static RoleOperation getOperation(String name) {
return roleOperationMap.get(name);
}
}
class RootAdminRole implements RoleOperation {
private final String roleName;
public RootAdminRole(String roleName) {
this.roleName = roleName;
}
@Override
public String operation() {
return roleName + " root permission";
}
}
class OrderAdminRole implements RoleOperation {
private final String roleName;
public OrderAdminRole(String roleName) {
this.roleName = roleName;
}
@Override
public String operation() {
return roleName + " order permission";
}
}
class NormalRole implements RoleOperation {
private final String roleName;
public NormalRole(String roleName) {
this.roleName = roleName;
}
@Override
public String operation() {
return roleName + " normal permission";
}
}
策略模式
package test;
public class Test {
public static void main(String[] args) {
System.out.println(judge(new RootAdminRole("ROLE_ROOT_ADMIN")));
}
public static String judge(RoleOperation roleOperation) {
RoleContext roleContext = new RoleContext();
roleContext.setOperation(roleOperation);
return roleContext.execute();
}
}
// 策略
interface RoleOperation {
// 策略方法
String operation();
}
// 环境类:持有一个策略类的引用,最终给客户端调用
class RoleContext {
private RoleOperation roleOperation;
public void setOperation(RoleOperation roleOperation) {
this.roleOperation = roleOperation;
}
public String execute() {
return roleOperation.operation();
}
}
// 具体策略类
class RootAdminRole implements RoleOperation {
private final String roleName;
public RootAdminRole(String roleName) {
this.roleName = roleName;
}
@Override
public String operation() {
return roleName + " root permission";
}
}
class OrderAdminRole implements RoleOperation {
private final String roleName;
public OrderAdminRole(String roleName) {
this.roleName = roleName;
}
@Override
public String operation() {
return roleName + " order permission";
}
}
class NormalRole implements RoleOperation {
private final String roleName;
public NormalRole(String roleName) {
this.roleName = roleName;
}
@Override
public String operation() {
return roleName + " normal permission";
}
}