Re: [Digester]How do you populate a map?

[pgarvie]

Embarrassed? Awww man forget it. Your example was well worth it and then some. Base on it, here's one way:

public void testLibraryBook() throws SAXException, IOException
{
Digester digester = new Digester();
ClassLoader classLoader = PersistenceHandlerFactory.class.getClassLoader();
URL resource = classLoader.getResource("library.xml");
assertNotNull("Resource should not be null!!", resource);

digester.addObjectCreate("Library", HashMap.class);
digester.addCallMethod("Library/Book", "put", 2);
digester.addRule("Library/Book", new StringObjectCreateRule(String.class, "title"));
digester.addCallParam("Library/Book", 0, true);
digester.addRule("Library/Book", new LibraryBookCreateRule(LibraryBook.class, "title"));
digester.addCallParam("Library/Book", 1, true);
HashMap map = (HashMap)digester.parse(resource.toString());
assertNotNull("Hash map should not be null!!", map);
assertEquals("Based on the xml file, map should have size of 6", 6, map.size());
}

public class LibraryBookCreateRule extends ObjectCreateRule
{
private String key;

public LibraryBookCreateRule(Class aClass, String key)
{
super(aClass);
this.key = key;
}

public void begin(String s, String s1, Attributes attributes) throws Exception
{
LibraryBook book = new LibraryBook(attributes.getValue(key));
super.getDigester().push(book);
}
}

public class LibraryBook
{
private String title;

public LibraryBook(String title)
{
this.title = title;
}

public String getTitle()
{
return title;
}
}

Using library.xml:

<?xml version="1.0" encoding="UTF-8"?>

<Library>
<Book title="The Firm"/>
<Book title="The Cat in the Hat"/>
<Book title="Green Eggs and Ham"/>
<Book title="Object Cobol"/>
<Book title="Anne of Green Gables"/>
<Book title="Smoke 'Em If Ya Got 'Em"/>
</Library>


At 03:04 PM 2/10/2003 -0800, you wrote:

I'm really embarrassed after posting a HowTo on populating a map, but I've
found that it's not as clear as I thought it was.  I know how to do it with
the following example:

<?xml version='1.0'?>
<map>
  <key name='The key'/>
  <value name='The value'/>
</map>

But how to do it with this?

<?xml version='1.0'?>
<map>
  <key name='KeyA'/>
  <value name='ValueA'/>
  <key name='KeyB'/>
  <value name='ValueB'/>
</map>

CallMethodRule is only invoked at the end of <map>, so you can't call it
twice, once for each key, value pair.
The situation I have that I actually need to solve looks more like this:

<Library>
        <Book title="The Firm" />
        <Book title="The Cat in the Hat" />
</Library>

I would want Library to be a HashMap with titles for keys and Book objects
for values.  You can't use a CallMethodRule on Book because the put() method
belongs to Library, not Book.

Help?

BTW, I realize you can do this by creating proxy objects that call put() for
you.  That's inelegant IMHO and I was hoping that Digester 1.4 had solved
this issue.

K.C.

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