Apple WebObjects 3.5 Manual de usuario descargar pdf (Pagina 145)

When You Have an Applet’s Source Code

145

1. In Project Builder, add the ClientSideJava subproject to your project.

To do so, double-click the word “Subprojects” in the browser and then

choose

ClientSideJava.subproj in the Open panel.

When you build your project, Project Builder builds both the

individual Java

.class ﬁles and a .jar ﬁle containing the entire

ClientSideJava subproject. This way, you have the option of using

WOApplet’s

archive binding for browsers that support .jar ﬁles.

2. Add your class to the ClientSideJava subproject. Double-click Classes

in the subproject and then choose your

.java ﬁle in the Open panel.

3. In the class declaration, insert the “implements

SimpleAssociationDestination” clause.

public class MyApplet extends Applet implements

SimpleAssociationDestination {

....

}

4. Implement the keys method to return a list (Vector) of state keys

managed by the applet.

public Vector keys() {

Vector keys = new Vector(1);

keys.addElement("title");

return keys;

}

5. Implement the takeValueForKey and valueForKey methods to set and get the

values of keys.

synchronized public Object valueForKey(String key) {

if (key.equals("title")) {

return this.getLabel();

}

synchronized public void takeValueForKey(Object value, String key) {

if (key.equals("title")) {

if ((value != null) && !(value instanceof String) {

System.out.println("Object value of wrong type set for key

'title'. Value must be a String.");

} else {

this.setLabel(((value == null) ? "" : (String)value));

}

You should be able to access the keys directly or, ideally, through

accessor methods (in this example,

getLabel and setLabel). It is a good idea

to use the

synchronized modiﬁer with takeValueForKey and valueForKey because

these methods can be invoked from other threads to read or set data.

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Apple WebObjects 3.5 Manual de usuario Pagina 145

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