logon.java

Enjoy Web Dev With Tapestry 一书的源代码

package org.apache.struts.webapp.example;

import org.apache.tapestry.*;
import org.apache.tapestry.annotations.*;
import org.apache.tapestry.valid.*;
import org.apache.tapestry.web.*;

public abstract class Logon extends CommonPage {
	public abstract String getUsername();

	public abstract String getPassword();

	@Bean
	public abstract ValidationDelegate getDelegate();

	@Message("error.database.missing")
	public abstract String getMissingMsg();
	
	@Message("error.password.mismatch")
	public abstract String getMismatchMsg();
	
	User getUser(UserDatabase database, String username, String password) throws ExpiredPasswordException {
		User user = null;
		if (database == null) {
			getDelegate().setFormComponent(null);
			getDelegate().record(getMissingMsg(), null);
		} else {
			user = database.findUser(username);
			if ((user != null) && !user.getPassword().equals(password)) {
				user = null;
			}
			if (user == null) {
				getDelegate().setFormComponent(null);
				getDelegate().record(getMismatchMsg(), null);
			}
		}
		return user;
	}

	@InjectObject("service:tapestry.globals.WebRequest")
	public abstract WebRequest getRequest();
	
	void saveUser(User user) {
		WebSession session = getRequest().getSession(true);
		session.setAttribute(Constants.USER_KEY, user);
		if (log.isDebugEnabled()) {
			log.debug("LogonAction: User '" + user.getUsername()
					+ "' logged on in session " + session.getId());
		}
	}

	public void onSubmit() {
		UserDatabase database = getUserDatabase();
		String username = getUsername();
		String password = getPassword();
		User user;
		try {
			user = getUser(database, username, password);
		} catch (ExpiredPasswordException e) {
			throw new RedirectException("ExpiredPassword.do");
		}
		saveUser(user);
		if (getDelegate().getHasErrors()) {
			return;
		}
		throw new RedirectException("MainMenu.do");
	}
}