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Portlets can create new preferences for users, or modify preferences that are not marked read-only. Portlets can also remove a preference for a user or, if the preference has a default, return it to that initial default value. Before modifying a preference, a portlet should check to see whether the preference is marked read-only and is nonmodifiable by the end user. The isReadOnly() method on the PortletPreferences object takes the name of the preference as an argument and returns true if the preference is read-only. The preference can be marked read-only either in the deployment descriptor or through another administration tool provided by the portal container. If the preference is not in the deployment descriptor and the preference is not marked read-only by the portal container, the isReadOnly() method will return false. The portlet can modify or create the portlet preference.

For a scenario of a reader who is solely interested in your article and the discussion stemming from it, an extension can help to keep that reader involved. An appropriate plug-in is one named Subscribe to Comments, created by Mark Jaquith, originally by Jennifer at ScriptyGoddess (http://www.scriptygoddess.com/archives/2004/06/03/wp-subscribe-to-comments/). You can download this plug-in from http://txfx.net/code/wordpress/subscribe-to-comments/. The Subscribe to Comments plug-in allows your readers to subscribe to the comments of a post. This will appeal to those readers who enjoy the conversation aspect of your blog and want to know whenever someone else has posted a comment.

public boolean isReadOnly(String key)

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Select administer access control access rules (admin/access/rules) to access tools to block or allow specific usernames, e-mail addresses, or hosts (IP addresses). By building specific or general rules, you can block access from known problem sources. The access rules consist of an access type (allow|deny), a rule type (username|e-mail|host), and a mask. The masks use pattern matching, where the percent sign (%) matches any number of characters, even zero characters, and the underscore (_) matches exactly one character. Exercise 2-1 demonstrates adding an access rule.

As mentioned in the previous chapter, you can obtain a connection to a database in multiple ways: through a direct connection, connection pooling, or the connection provided by an application server. All of these are transparently wrapped in a DataSource, which is inserted into the JdbcTemplate class. So you don t need to know about the underlying native objects as provided by the database. Sometimes, however, you might want to gain access to the underlying objects in order to perform database-specific operations on them, such as for changing the connection timeout. Spring s JDBC support provides access to the underlying objects by using one of the implementations of the NativeJdbcExtractor interface. Spring provides a SimpleNativeJdbcExtractor implementation,

Portlets may set preferences during an action request. There are two methods for setting preferences, one for String object values and the other for String array values. Both will throw a ReadOnlyException if the preference is marked read-only in the deployment descriptor. These methods also must have a name for the preference that is not null, or they will throw an IllegalArgumentException. They may also throw that exception if the length of the name or the value is longer than the portal container allows.

Suppose you want to block all usernames that contain the text bad word. 1. Create a new rule by selecting access control account rules add rule (admin/access/rules/add). 2. Select Deny and Username, and then enter the mask %bad word%, as shown in Figure 2-3.

The portlet API provides the reset() method for removing portlet preferences. If a default value is specified for that preference, the preference cannot be removed but can only be reset to the default value. If the value is read-only, it cannot be removed or reset, and the reset(String key) method will throw a ReadOnlyException:

3. Click the Add Rule button. Your rule is now in effect. 4. To test it and make sure it behaves as you expected, go to the Check Rules subtab (admin/access/ rules/check). Here, you can enter any username in the Username field, and then click the Check Username button see if the name would be allowed or denied. For this example, try usernames like real bad word, bad words, and not a bad word. They should all be denied. Then try badword and ad word. They should be allowed.

which works for many connection pools and application servers, but it also offers more specific implementations for a number of well-known connection pools and application servers, as shown in Table 6-4. Table 6-4. Specific Native JDBC Extractor Implementations

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