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The variable reference ${url} refers to the URL of the jar we uploaded with the <post-blog-resource> task. Now that we know how we want the new Ant tasks to work, let s discuss how to implement them.
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16.1.1 Base blog task Because the two Ant blogging tasks we re developing in this chapter each need the same set of blog server connection attributes and the same connection logic, it makes sense for them to share a common base class that handles those concerns. Once we have a common base class, it will be easy to develop other Ant tasks for blogging. First, we ll create an abstract base class BaseBlogTask.java. We ll make it easy for subclasses to blog by providing a getBlog() method, which returns a Blog
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Figure 16.1 Relationship between the task classes developed in this chapter
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object that supports all of the methods needed for interacting with a blog. Our abstract class will require the following attributes:
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apitype This is the type of API, either metaweblog or atom. targeturl This is the URL of the blog server s web services interface. appkey This is the application key (may be required for some older blog servers). username This is the username for logging into the blog server. password This is the password for logging into the blog server. blogid This is the ID of the target blog.
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Figure 16.1 illustrates the relationship between the BaseBlogTask class and the other task classes we ll develop in this chapter. BaseBlogTask.java is short and sweet, just a method and some properties, so let s take a look at the whole class, shown in listing 16.2.
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Listing 16.2 Source code for the custom Ant BaseBlogTask.java
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package com.manning.blogapps.chapter16; import org.apache.tools.ant.*; import com.manning.blogapps.chapter10.blogclient.*; import java.util.*; public abstract class BaseBlogTask extends Task { protected String apitype = "metaweblog";
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Blogging from Ant
protected protected protected protected protected
String String String String String
targeturl = null; appkey = null; username = null; password = null; blogid = null;
protected Blog getBlog() throws Exception { BlogConnection con = BlogConnectionFactory.getBlogConnection( apitype, targeturl, username, password); if (appkey != null) { con.setAppkey(appkey); } return con.getBlog(blogid); } public void setApitype(String apitype) { this.apitype = apitype; } public void setTargeturl(String targeturl) { this.targeturl = targeturl; } public void setAppkey(String appkey) { this.appkey = appkey; } public void setUsername(String username) { this.username = username; } public void setPassword(String password) { this.password = password; } public void setBlogid(String blogid) { this.blogid = blogid; }
The file starts with the usual package imports. The class itself, BaseBlogTask, extends the Ant org.apache.tools.ant.Task class b. Inside the class, we define a member field for each of the task attributes and we set the default apitype to metaweblog C. In the task s getBlog() method D, we call the BlogConnectionFactory to get a BlogConnection suitable for the apitype we have E. Once we have a BlogConnection, we set its apikey, if we have one F. Only Blogger.com requires an apikey, but it no longer requires a unique one anybody can use the apikey 0123456789ABCDEF . Finally, we use the blogid to fetch and return a Blog object G, ready for use by the calling subclass. The rest of the class is the setters, one for each of the
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attributes supported by the task, starting with the apitype H. Now, let s put BaseBlogTask to use.
16.1.2 Post blog entry task
We ll implement <post-blog-entry> as a Java class PostBlogEntryTask.java by extending BaseBlogTask. We ll inherit the blog server connection attributes, so we need to add only the three new attributes listed below. All of these attributes are optional arguments, but you should set at least one title and one content attribute otherwise, there will be nothing to your blog entry.
title This is the title of the blog post. It should be plain text without HTML markup. category This is the category for the blog post. content This is the content for the blog post. It may include HTML markup, but any characters with special meaning in XML must be escaped.
Because we re simply extending the BaseBlogTask, the code for PostBlogEntryTask.java is pretty brief, only about 50 lines. listing 16.3 shows it in its entirety.
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