customerpage.java

Enjoy Web Dev With Tapestry 一书的源代码

package com.ttdev.customerCRUD;

import org.apache.tapestry.*;
import org.apache.tapestry.annotations.*;
import org.apache.tapestry.event.*;
import org.apache.tapestry.html.*;

public abstract class CustomerPage extends BasePage implements
		PageBeginRenderListener {
	@Persist("client")
	public abstract Long getInternalId();
	public abstract void setInternalId(Long internalId);

	public abstract Customer getCustomer();
	public abstract void setCustomer(Customer customer);

	@Persist("client")
	public abstract Customer getOldCustomer();
	public abstract void setOldCustomer(Customer customer);

	@InjectObject("service:com.ttdev.customerCRUD.CustomerPageService")
	public abstract CustomerPageService getCustomerPageService();

	public void pageBeginRender(PageEvent event) {
		Customer customer;
		if (getInternalId() == null) {
			customer = getCustomerPageService().getDefault();
		} else {
			customer = getCustomerPageService().load(getInternalId());
			if (!getRequestCycle().isRewinding()) {
				setOldCustomer(getCustomerPageService().loadPersistent(
						getInternalId()));
			} else {
				try {
					getCustomerPageService().assertUnchanged(getInternalId(), getOldCustomer());
				} catch (DataChangedException e) {
					throw new PageRedirectException("Home");
				}
			}
		}
		setCustomer(customer);
	}

	public String onOK() {
		getCustomerPageService().save(getCustomer(), getInternalId() == null);
		return "Home";
	}

}