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CHAPTER 7 TAPESTRY
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Table 7-1. Tapestry JARs and Dependencies
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tapestry-4.0.jar tapestry-annotations-4.0.jar tapestry-contrib-4.0.jar hivemind-1.1.jar hivemind-lib-1.1.jar commons-codec-1.3.jar commons-fileupload-1.0.jar commons-logging-1.0.4.jar javassist-3.0.jar ognl-2.6.7.jar oro-2.0.8.jar
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Tapestry Core Java 5 annotation support Community contributed components Services and configuration microkernel core Common HiveMind functionality Encoder implementations File uploading and multipart support Logging package Reflection and bytecode manipulation Object-Graph Navigation Language Regular expression package
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Let s start by creating a simple HTML page for our application. Tapestry page templates are regular HTML documents decorated with tags and attributes for Tapestry to replace dynamically at runtime. The initial template for our simple application is shown in Listing 7-1. Listing 7-1. Tapestry Time HTML Template (Home.html) <html> <body> <h1>Tapestry Time</h1> The current time is <span jwcid="time">high noon</span>! </body> </html> Save this page template as Home.html in the context directory. Like any good framework, Tapestry follows the convention-over-configuration philosophy. At start-up time Tapestry will look for a page named Home and render it. (You can override this default behavior, but this is an easy convention to follow, and most Tapestry applications do so it is easy to find an application main page easily.) The HTML document looks like any other HTML document. It is viable in any compliant Web browser and more importantly, editable in any WYSIWYG HTML editor such as HomeSite or Macromedia s Dreamweaver as shown in Figure 7-2.
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Figure 7-2. Simple HTML page in a WYSIWYG editor In the Home.html template we use a span tag with an attribute jwcid attribute which stands for Java Web Component Id. There are two ways to declare Tapestry components in an HTML template: explicitly as shown in the example or implicitly by prefixing the component name with @. Implicit declarations are like anonymous inner classes in Java; you are declaring and using a component on the spot. Since we are using an explicit declaration, the meat and potatoes of the components must be defined somewhere else so that we can refer to it by name.
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The Java Code
The code that will provide the backing for the component is contained in the file Home.java. The Home class provides one simple method called getTime, which returns a new java.util. Date object as shown in Listing 7-2. Listing 7-2. Java Class Extending BasePage, Which Implements IPage package com.integrallis.time; import java.util.Date; import org.apache.tapestry.html.BasePage;
CHAPTER 7 TAPESTRY
public abstract class Home extends BasePage { public Date getTime() { return new Date(); } } This abstract class extends the Tapestry BasePage abstract class, which in turn implements the IPage interface. We will learn more about both of these classes and interfaces as we work through the sample. Figure 7-3 shows a partial class hierarchy for the BasePage class. Remember, in Tapestry everything is a component, including pages.
Figure 7-3. BasePage class hierarchy
Page XML Descriptor
The page specification file is an XML file with the extension page . Remember, pages are a special type of Tapestry component, and this is the configuration file for the Home page component of our application. Pages can contain components, and in this case our page contains one component of type Insert. The Insert component is one of many built-in Tapestry components. Insert gives you the ability to insert text dynamically in the HTML response with the option of filtering special characters or formatting by using a java.text.Format instance. Listing 7-3 shows the contents of the Home.page file. Listing 7-3. The Page Specification XML File (Home.page) < xml version="1.0" > <!DOCTYPE page-specification PUBLIC "-//Apache Software Foundation//Tapestry Specification 4.0//EN" "http://jakarta.apache.org/tapestry/dtd/Tapestry_4_0.dtd"> <page-specification class="com.integrallis.time.Home"> <component id="time" type="Insert"> <binding name="value" value="ognl:time"/> </component> </page-specification>
CHAPTER 7 TAPESTRY
The DTD located at http://jakarta.apache.org/tapestry/dtd/Tapestry_4_0.dtd gives us a clue as to what types of elements can be configured via XML in Tapestry. Figure 7-4 shows a graphical depiction of the page-specification element showing the detail of the component element.
Figure 7-4. DTD definition for the page-specification element The Home.page file specifies that: This is the page specification for a Home page as deduced by the name of the file Home.page, the associated Home.html template, and the class com.integrallis. time.Home as defined in the class attribute of the page-specification element. It defines one component with an id of time which is of type Insert. The component time binds the value of the expression ognl:time to the value of the component.
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