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Listing 8.21 CalendarPage, the page controller for Home.hml
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package com.manning.hq.ch08.tapestry; import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.List; import org.apache.tapestry.IRequestCycle; import org.apache.tapestry.html.BasePage; import import import import import com.manning.hq.ch08.Event; com.manning.hq.ch08.CalendarDay; com.manning.hq.ch08.CalendarModel; com.manning.hq.ch08.DateUtils; com.manning.hq.ch08.EventManager;
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public class CalendarPage extends BasePage { private List row; private CalendarDay day; private Event event; private int month; private int year; private int previousMonth; private int previousYear; private int nextMonth; private int nextYear; private CalendarModel model; public CalendarPage() { Calendar thisMonth = Calendar.getInstance(); month = thisMonth.get(Calendar.MONTH); year = thisMonth.get(Calendar.YEAR); storeNextMonth(); storePreviousMonth(); Defines methods for } iterating over the rows, days, and events public List getRow() { return row; } public public public public public void setRow(List row) { this.row = row; } CalendarDay getDay() { return day; } void setDay(CalendarDay day) { this.day = day; } Event getEvent() { return event; } void setEvent(Event event) { this.event = event; }
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public int getPreviousMonth() { return previousMonth; }
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Web frameworks: WebWork, Struts, and Tapestry
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public int getPreviousYear() { return previousYear; } public int getNextMonth() { return nextMonth; } public int getNextYear() { return nextYear; } Allows references from template by ognl:formattedDate public String getFormattedDate(){ SimpleDateFormat f = new SimpleDateFormat("MMMM yyyy"); return f.format(getCalendarModel().getDate()); } public CalendarModel getCalendarModel(){ if(model == null){ loadModel(); } return model; } Allows templates to get model with ognl:calendarModel
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Handles the backLink and forwardLink requests public void link(IRequestCycle cycle){ Object[] params = cycle.getServiceParameters(); month = ((Integer) params[0]).intValue(); year = ((Integer) params[1]).intValue(); loadModel(); storeNextMonth(); storePreviousMonth(); } Contains the visit, a central management object private void loadModel() { EventManager manager = (EventManager) getVisit(); List eventsFor = manager.findEventsFor(month, year); model = new CalendarModel(month, year); model.setEvents(eventsFor); } private void storePreviousMonth() { Calendar previous = DateUtils.createCalendarMonth(month - 1, 1, year); previousMonth = previous.get(Calendar.MONTH); previousYear = previous.get(Calendar.YEAR); } private void storeNextMonth() { Calendar next = DateUtils.createCalendarMonth(month + 1, 1, this.year);
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nextMonth = next.get(Calendar.MONTH); nextYear = next.get(Calendar.YEAR); } }
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Looking at listing 8.21, you can see a lot of the same things that we did in the previous Actions. The basic responsibility of the controller is to load the events, storing them in a CalendarModel and making them available to the view. The controller provides methods that allow the @Foreach components to iterate over getRows(), getDays(), and getEvents(). Finally, it exposes the getPreviousMonth(), getPreviousYear(), getNextMonth(), and getNextYear() fields so the forward and back links can be created. The loadModel() method is where Hibernate shows up. One of the Tapestry central concepts is the Visit object, which is the central manager -type object that Tapestry creates for you and stores in the HttpSession. This allows different pages to share state without having to muck about with the session itself. The actual Visit object, which you can get a handle to by using getVisit(), can be any kind of object you want. In this case, you have a simple EventManager object that delegates Hibernate calls to your EventDao, like so:
public List findEventsFor(int month, int year) { return new EventDao().findEventsFor(month, year); }
8.6.5 Page specification
You may be wondering about a couple of things: how the Home.html page knows which class to get its information from, and how the backLink and nextLink components generate the HTML for the hyperlinks. The answer to both of these mysteries is the page specification file. The page specification is a file that shares the same name as the HTML page, which wires the Java class and HTML template together. It s roughly analogous to the struts-config.xml or xwork.xml file, except
Web frameworks: WebWork, Struts, and Tapestry
that each page gets its own file. Listing 8.22 shows the page specification for Home.html. Listing 8.22 /WEB-INF/Home.page, the page specification for Home.html
< xml version="1.0" encoding="UTF-8" > <!DOCTYPE page-specification PUBLIC "-//Apache Software Foundation//Tapestry Specification 3.0//EN" "http://jakarta.apache.org/tapestry/dtd/Tapestry_3_0.dtd"> Links Home.html <page-specification to CalendarPage class= "com.manning.hq.ch08.tapestry.CalendarPage"> Makes backLink a hyperlink <component id="backLink" type="DirectLink"> <binding name="listener" expression="listeners.link"/> Calls the <binding name="parameters" link() method expression="{previousMonth,previousYear}"/> when clicked </component> <component id="nextLink" type="DirectLink"> <binding name="listener" expression="listeners.link"/> <binding name="parameters" expression="{nextMonth,nextYear}"/> </component> </page-specification>
As you can see the, <page-specification> element defines which page class acts as Home.html s controller. Also, it defines two components: backLink and nextLink. Both of them inherit from @DirectLink, which generates an <a> link to the CalendarPage. The listener <binding> calls the link() method, passing the getPreviousYear() and getPreviousNext() values as parameters. Looking back at the link() method, you retrieve those values from the IRequestCycle object that Tapestry provides you. Defining components in the page specification simplifies the template, which makes the page designer s job a bit easier. But the complexity has to go somewhere, so it moves to the page specification.
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