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return inst.getTime(); } }
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Show any two developers an architecture, and tell them to pick out which classes are part of the Controller and/or Model and you are likely to get two different answers. Nonetheless, here, our model (as we call it) consists of several classes, including our domain model, the Event. However, to avoid complicating the view, let s add a few more classes to the model, as shown in listing 8.12. Listing 8.12 CalendarModel, which builds a 7x6 grid of calendar days that can hold events
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package com.manning.hq.ch08; import import import import import java.util.ArrayList; java.util.Calendar; java.util.Date; java.util.Iterator; java.util.List;
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import com.manning.hq.ch08.Event; public class CalendarModel { private Date date; private List rows = new ArrayList(); /** * Creates a Model for the given month and year. Builds a 7x6 * grid that is full of empty days. * @param month 0-11 (0 = January) * @param year Creates an */ empty month public CalendarModel(int month, int year){ Calendar m = Calendar.getInstance(); m.set(year, month, 1); date = m.getTime(); int dayOfWeek = m.get(Calendar.DAY_OF_WEEK); int offsets = 0;
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int currentDay = 0; boolean done = false; for(int i = 0; i < 6; i++){ ArrayList row = new ArrayList(); for(int j = 0; j < 7; j++){ offsets++; if(offsets >= dayOfWeek && !done){ currentDay++; } row.add(new CalendarDay(currentDay)); if(m.get(Calendar.MONTH) > month){ currentDay = 0; done = true; }else { m.add(Calendar.DATE, 1); } } rows.add(row); } } public Date getDate() { return date; } public void setDate(Date date) { this.date = date; } /** * Sorts a list of Events into their proper days. * @param events Sorts events */ into the days public void setEvents(List events) { Calendar date = Calendar.getInstance(); date.clear(); // Put each event into the correct day. for (Iterator it = events.iterator(); it.hasNext();) { Event ev = (Event) it.next(); date.setTime(ev.getStartDate()); int weekOfMonth = date.get(Calendar.WEEK_OF_MONTH) - 1; int dayOfWeek = date.get(Calendar.DAY_OF_WEEK) - 1; List row = getRow(weekOfMonth); CalendarDay day = (CalendarDay) row.get(dayOfWeek); day.addEvent(ev); } }
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/** * Iterated over by the JSP. * @return */ public List getRows() { return rows; } /** * Get row at the given index. * @param rowNumber * @return */ private List getRow(int rowNumber){ return (List) rows.get(rowNumber); } }
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The class in listing 8.12 seems a bit complex, but the net result is to greatly simplify the JSP presentation logic. One of the bigger challenges of displaying information in a useful, attractive fashion in an HTML page is that essentially everything has to be either a table or a list. By using a View Helper pattern, like CalendarModel, the JSP just has to iterate over rows and columns to build a table. All of the complicated sorting code can be left as a Java class (where it can very easily be tested by JUnit). The three important methods to examine are the constructor, which builds the empty grid; setEvent(), which sorts; and getRows(), which is what the JSP will use to iterate over. The ugly details of sorting and grid building are kept private in CalendarModel, where no doubt an enterprising developer can streamline them without having to worry about changing either the JSP or CalendarAction. The final piece of the model is the CalendarDay, a simple value object that holds the event and the number to display on the page (see listing 8.13). Each CalendarDay represents a single grid square in your calendar table.
WebWork
Listing 8.13 CalendarDay, a simple value object that holds events and the day
package com.manning.hq.ch08; import java.util.ArrayList; import java.util.List; import com.manning.hq.ch08.Event; public class CalendarDay { private List events = new ArrayList(); private int day; public CalendarDay(int currentDay) { day = currentDay; public void addEvent(Event event){ events.add(event); } public int getDayOfMonth() { return day; } public List getEvents() { return events; } public boolean isNotEmpty() { return day != 0; } } }
Now that we have defined both the Model and Controller, the final piece of the puzzle is the JSP view (see listing 8.14), which is used to display your CalendarModel. In the view layer here, you will use a mixture of both WebWork s tag libraries and JSTL. Most J2EE web frameworks have their own tag libraries, which handle some of the basics such as iteration and the display of values and URLs. WebWork is no exception. WebWork s form processing and presentation tag libraries are excellent and well worth using, though we won t see them in action here. We recommend you check out WebWork in Action (Manning, forthcoming) for more details on WebWork s tag library. However, it is often far easier to just use JSTL, which works identically in any JSP-based web framework, like Struts, WebWork, or Spring MVC. If you work on as many different projects as we do,
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