helloworldhome.java

Tapestry的一个练习例子

package com.ttdev.helloworld;

import java.util.Date;
import java.util.List;

import org.apache.hivemind.util.PropertyUtils;
import org.apache.tapestry.IPage;
import org.apache.tapestry.IRequestCycle;
import org.apache.tapestry.annotations.Bean;
import org.apache.tapestry.annotations.InitialValue;
import org.apache.tapestry.annotations.InjectPage;
import org.apache.tapestry.form.IPropertySelectionModel;
import org.apache.tapestry.form.StringPropertySelectionModel;
import org.apache.tapestry.html.BasePage;
import org.apache.tapestry.valid.ValidationConstraint;
import org.apache.tapestry.valid.ValidationDelegate;

import com.ttdev.eshop.Catalog;
import com.ttdev.eshop.ProductDetails;

public abstract class HelloworldHome extends BasePage {
	@Bean
	public abstract ValidationDelegate getDelegate();

	@InjectPage("Result")
	abstract public Result getResultPage();

	public String getGreetingSubject() {
		return "John";
	}

	@InitialValue("literal:MSFT")
	abstract public String getStockId();

	abstract public Date getQuoteDate();

	public IPropertySelectionModel getAvailStockIds() {
		return new StringPropertySelectionModel(new String[] { "IBM", "MSFT",
				"RHAT" });
	}

	public IPage onOk(IRequestCycle cycle) {
		int stockValue = (getStockId() + getQuoteDate().toString()).hashCode() % 100;
		Result resultPage = getResultPage();
		resultPage.setStockValue(stockValue);
		return resultPage;
	}

	private KnownPatrons knownPatrons;

	@InjectPage("Result1")
	public abstract IPage getResult1();

	public abstract int getWeight();

	public abstract String getPatronCode();

	public abstract Date getShippingDate();

	public abstract String getDesc();

	public HelloworldHome() {
		knownPatrons = new KnownPatrons();
	}

	public KnownPatrons getKnownPatrons() {
		return knownPatrons;
	}

	public IPage onSubmit() {
		ValidationDelegate delegate = getDelegate();
		int weight = getWeight();
		Integer discount = knownPatrons.getDiscount(getPatronCode());
		if (getPatronCode() != null && getPatronCode().equals("p1")
				&& weight > 50) {
			delegate.setFormComponent(null);
			delegate.record("Can't ship 50kg or more for p1",
					ValidationConstraint.CONSISTENCY);
		}
		if (delegate.getHasErrors()) {
			return null;
		}
		int postagePerKg = 10;
		int postage = weight * postagePerKg;
		if (discount != null) {
			postage = postage * discount.intValue() / 100;
		}
		IPage resultPage = getResult1();
		PropertyUtils.write(resultPage, "postage", new Integer(postage));
		return resultPage;
	}

	public List getProducts() {
		return Catalog.getGlobalCatalog().getProducts();
	}

	@InjectPage("ProductDetails")
	public abstract ProductDetails getDetailsPage();

	public ProductDetails onClickDetailsLink(String productId) {
		getDetailsPage().setProductId(productId);
		return getDetailsPage();
	}

}