confirm.java

Tapestry的一个练习例子

package com.ttdev.eshop;

import java.util.Iterator;
import java.util.List;

import org.apache.tapestry.IPage;
import org.apache.tapestry.PageRedirectException;
import org.apache.tapestry.annotations.InjectPage;
import org.apache.tapestry.annotations.InjectState;
import org.apache.tapestry.annotations.InjectStateFlag;
import org.apache.tapestry.callback.PageCallback;
import org.apache.tapestry.event.PageEvent;
import org.apache.tapestry.event.PageValidateListener;
import org.apache.tapestry.html.BasePage;

public abstract class Confirm extends BasePage implements PageValidateListener {
	@InjectState("cart")
	public abstract List getCart();

	@InjectState("user")
	public abstract User getUser();

	public double getTotal() {
		double total = 0;
		for (Iterator iter = getCart().iterator(); iter.hasNext();) {
			String productId = (String) iter.next();
			total += Catalog.getGlobalCatalog().lookup(productId).getPrice();
		}
		return total;
	}

	public String getCreditCardNo() {
		return getUser().getCreditCardNo();
	}

	@InjectPage("Login")
	public abstract Login getLoginPage();

	@InjectStateFlag("user")
	public abstract boolean getUserExists();

	@InjectPage("Confirm")
	public abstract Confirm getConfirmPage();

	public void pageValidate(PageEvent event) {
		if (!getUserExists()) {
			Login login = getLoginPage();
			login.setNextPage(new PageCallback("Confirm"));
			throw new PageRedirectException(login);
		}
	}

	public IPage onCheckout() {
		if (getUserExists()) {
			return getConfirmPage();
		} else {
			Login login = getLoginPage();
			login.setNextPage(new PageCallback("Confirm"));
			return login;
		}
	}

	public String onContinueShopping() {
		return "EshopHome";
	}
	public String onConfirm() {
		return null;
	}	
}