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Listing 16.3 PostBlogEntryTask.java
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package com.manning.blogapps.chapter16; import org.apache.tools.ant.*; import com.manning.blogapps.chapter10.blogclient.*; import com.manning.blogapps.chapter10.metaweblogclient.MetaWeblogConnection; import com.manning.blogapps.chapter10.atomclient.AtomBlogConnection; import java.util.*; public class PostBlogEntryTask extends BaseBlogTask { protected String title = null; protected String category = null; protected String content = null;
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public void execute() throws BuildException { try { System.out.println("Posting to blog"); System.out.println(" username=" + username); System.out.println(" targeturl=" + targeturl); System.out.println(" apitype=" + apitype); System.out.println(" title=" + title); System.out.println(" content=" + content); System.out.println(" category=" + category);
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Blog blogSite = getBlog(); BlogEntry entry = blogSite.newEntry(); if (title != null) { entry.setTitle(title); } if (category != null) { List categories = new ArrayList(); categories.add( new BlogEntry.Category(category)); entry.setCategories(categories); } if (content != null) { entry.setContent( new BlogEntry.Content(content)); } entry.setPublicationDate(new Date()); entry.save(); String id = entry.getId(); System.out.println("New post id is " + id);
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} catch (Exception e) { throw new BuildException(e); }
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} public void setTitle(String title) { this.title = title; } public void setCategory(String category) { this.category = category; } public void setContent(String content) { this.content = content; } }
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We start by declaring the class PostBlogEntryTask b to extend BaseBlogTask. Inside the class, we declare a member field for each of the attributes we discussed above: title, category, and content C. In the execute() method D and within a try-catch block, we first print out the key attributes so that they will appear in the Ant log file. Next, we call BaseBlogTask s getBlog() to get a Blog object and then use that to create a BlogEntry E. Once we ve created a BlogEntry, we need to set the title, content, and category specified by the task attributes. Again, we must be forgiving here because all three arguments are optional. If we have a title, we set it on the entry F. If
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Blog your software build process
we have a category, we create a BlogEntry.Category object, add it to a java. util.List, and set the entry s categories property G. If we have content, we create a BlogEntry.Content object and use it to set the entry s content property H. We set the entry s publication date to the current time I and, at last, we are ready to post by calling its save() method J. To verify that a new blog entry was posted, we print the ID returned by the blog server 1) . And finally, we close the try-catch block. If anything went wrong, we throw an Ant BuildException 1! so that Ant s error handler can take over. That s really all there is to posting to a blog from Ant. The rest of the class consists of property setters, one for each attribute of the Ant task, starting with the title attribute 1@ . Now let s move on to the post blog resource task.
16.1.3 Post blog resource task
The <post-blog-resource> task also extends BaseBlogTask. To enable the uploading of a file to a blog, the task adds four attributes:
filename This is the name of the file to be uploaded. It may be an absolute or relative path. contenttype This is the content-type of the file. Its value must be a MIME media type; for example, text/plain for plain text, text/html for HTML, or application/x jar for a Java jar file. resourcename name to be assigned to uploaded file on server. urlproperty This is the name of the Ant property in which the URL of the uploaded file should be stored. It defaults to url if not specified.
Let s turn our attention now to the source, shown in listing 16.4.
Listing 16.4 Source code for custom Ant task PostBlogResourceTask.java
package com.manning.blogapps.chapter16; import java.io.*; import org.apache.tools.ant.*; import com.manning.blogapps.chapter10.blogclient.*; public class PostBlogResourceTask extends BaseBlogTask { private String filename = null; private String contenttype = null; private String resourcename = null; private String urlproperty = "uploadurl";
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public void execute() throws BuildException { try { System.out.println("Posting file resource to blog"); System.out.println(" username=" + username); System.out.println(" targeturl=" + targeturl); System.out.println(" apitype=" + apitype); System.out.println(" filename=" + filename); System.out.println(" contenttype=" + contenttype); System.out.println(" resourcename=" + resourcename); Blog blog = getBlog(); BlogResource resource = blog.newResource( resourcename, contenttype, new File(filename)); resource.save(); getProject().setProperty(urlproperty, resource.getContent().getSrc());
} catch (Exception e) { throw new BuildException(e); } } public void setFilename(String filename) { this.filename = filename; } public void setContenttype(String contenttype) { this.contenttype = contenttype; } public void setResourcename(String resourcename) { this.resourcename = resourcename; } public void setUrlproperty(String urlproperty) { this.urlproperty = urlproperty; }
After the familiar set of package import statements, we start by declaring the PostBlogResourceTask class b, which extends BaseBlogTask. Next, we declare a member field for each of the attributes mentioned above C. In the execute() method D, we first print out the key attributes so that they ll appear in the Ant log E. Next, we call getBlog() to get a Blog object F. Once we have a Blog object, all it takes is one call to Blog.newResource() G to upload the file specified by the task attributes. The newResource() method returns a BlogResource object representing the newly uploaded file. We store the URL of the uploaded file as an Ant property by using the task s getProject() method to get the Ant project object and the project s setProperty() method to set the property H.
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