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while (failedKeys.hasMoreElements()) { String failedKey = (String) failedKeys.nextElement(); writer.write("<BR>Error with preference: " + failedKey); } } //create a form so preferences can be created writer.write("<P><H2>Set Preferences</H2><P>"); PortletURL url = response.createActionURL(); writer.write("<FORM METHOD='POST' ACTION='" + url + "'>"); writer.write( "Preference 1: <INPUT NAME='pref1' TYPE='text' SIZE='30'><P>"); writer.write( "Preference 2: <INPUT NAME='pref2' TYPE='text' SIZE='30'><P>"); writer.write("<INPUT TYPE='submit'>"); writer.write("</FORM>"); } public void processAction(ActionRequest request, ActionResponse response) throws PortletException, IOException { //get the preference values from the request String pref1 = request.getParameter("pref1"); String pref2 = request.getParameter("pref2"); PortletPreferences prefs = request.getPreferences(); PortletSession session = request.getPortletSession(); //set the preferences prefs.setValue("pref1", pref1); prefs.setValue("pref2", pref2); //store the preferences try { prefs.store(); //if the store is successful, we can remove any validator //error messages in the session if (session.getAttribute(VALIDATOR_ERROR) != null) { session.removeAttribute(VALIDATOR_ERROR);

Now that you have a list of links in the same category as the article in this example, you can see how it all fits together. In the new sidebar code, you first need to find the category of the current article. A standard template tag helps you with that: get_the_category returns a list of the category IDs for the current post. Save the first category ID in a variable, $cat. For this

session.removeAttribute(FAILED_KEYS); } } catch (ValidatorException ve) { session.setAttribute(VALIDATOR_ERROR, ve.getMessage()); session.setAttribute(FAILED_KEYS, ve.getFailedKeys()); } } }

Summary

example, you deal with only the first category from the list. I have set my sample blog to use only single categories per post. Listing 17-14 shows this first step.

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To use a preferences validator, we had to create a class that implemented the PreferencesValidator interface, and then add a reference to the validator to the portlet deployment descriptor. The ExamplePreferencesValidator class simply checks each preference value to see if the length is four or more characters, in which case it passes. If the preference value fails validation, the validator adds the preference name to its collection of failed keys, and then throws a ValidatorException when it is done validating all of the preference values. We could have thrown a ValidatorException on the first failed preference if we wanted.

package com.portalbook.portlets; import java.util.*; import javax.portlet.PortletPreferences; import javax.portlet.PreferencesValidator; import javax.portlet.ValidatorException; public class ExamplePreferencesValidator implements PreferencesValidator { public void validate(PortletPreferences prefs) throws ValidatorException { LinkedList failedKeys = new LinkedList(); Enumeration names = prefs.getNames(); while (names.hasMoreElements()) { String name = (String) names.nextElement(); String value = prefs.getValue(name, ""); if (value.length() < 4) { failedKeys.add(name); } }

Note It is quite natural to have multiple categories per post. The code would need to be more sophisticated to handle that situation. It may be easier to use a plug-in like Related Posts by Mark Ghosh (http:// weblogtoolscollection.com/archives/2004/06/08/contextual-related-posts-in-wordpress/).

In this chapter, you learned how to perform the most common database operations, as well as more complex tasks, using Spring s data-access support. Spring provides a powerful abstraction framework that simplifies working with the JDBC API. This chapter also showed you how the new features provided by Spring 2.0 make working with the JDBC API easier. The concepts and examples provided in this chapter should give you enough information to start building your own application that uses database persistence. Now that you ve seen how Spring handles data access, the next chapter looks at bundling database operations into transactions.

7

Listing 17-14. Saving the First Category from the Post in sidebar-c.php < php $categories = get_the_category(); $cat = $categories[0]->cat_ID; > Once you have the category ID, you can use it with another standard template function get_posts. Not surprisingly, this function will get a list of posts. If you pass in the category ID from the last step, via the variable, the function will return a list of posts in the given category. Add an extra parameter to limit the number of posts returned. Once you have that list of posts, you can loop through the list, extracting the link to the post and the post title. Output them as an HTML link in an unordered list. Listing 17-15 shows the completed code with a header and a class style specified or the list. Note that because it uses the category from the current post, this list will also be in the same category. Listing 17-15. Generating the List of Posts in sidebar-c.php < php $categories = get_the_category(); $cat = $categories[0]->cat_ID; $posts = get_posts('numberposts=10&category=' . $cat); > <div id="sidebar-b"> <h2>< php _e('Other articles'); ></h2> <ul class="sidebar-b-sidelists"> < php foreach($posts as $post) : > <li><a href="< php the_permalink(); >"> < php the_title(); ></a></li> < php endforeach; > </ul> Next, add a list of links in the same category to the sidebar, using the WordPress template tag wp_get_links.

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