From 7d6eccbd43ba703306328e133c43e0760ceead8c Mon Sep 17 00:00:00 2001
From: "David A. Madore" <david@procyon.(none)>
Date: Tue, 13 Apr 2010 15:47:59 +0200
Subject: Handle d:xempty attribute, as proof of concept.

---
 org/madore/damlengine/DamlEngine.java        |  2 +-
 org/madore/damlengine/TodoAttr.java          | 13 +++++++------
 org/madore/damlengine/XemptyAttrHandler.java | 14 ++++++++++++++
 3 files changed, 22 insertions(+), 7 deletions(-)
 create mode 100644 org/madore/damlengine/XemptyAttrHandler.java

(limited to 'org')

diff --git a/org/madore/damlengine/DamlEngine.java b/org/madore/damlengine/DamlEngine.java
index 822b645..a2ce87e 100644
--- a/org/madore/damlengine/DamlEngine.java
+++ b/org/madore/damlengine/DamlEngine.java
@@ -13,7 +13,7 @@ public final class DamlEngine {
 
     public static final String DAML_NS = "http://www.madore.org/~david/NS/daml/";
 
-    private static Document doc;
+    static Document doc;
 
     private DamlEngine() { }  // Forbid instantiation
 
diff --git a/org/madore/damlengine/TodoAttr.java b/org/madore/damlengine/TodoAttr.java
index d4d877e..c4e554a 100644
--- a/org/madore/damlengine/TodoAttr.java
+++ b/org/madore/damlengine/TodoAttr.java
@@ -14,12 +14,13 @@ public class TodoAttr extends TodoItem {
     {
 	Class[] handlerArgTypes = new Class[]{ TodoAttr.class };
 	damlHandlers = new HashMap<String,Method>();
-	// try {
-	//     ;
-	// } catch (NoSuchMethodException e) {
-	//     // FIXME: this isn't good...
-	//     throw new Error("this is impossible");
-	// }
+	try {
+	    damlHandlers.put("xempty",
+			     XemptyAttrHandler.class.getMethod("handle", handlerArgTypes));
+	} catch (NoSuchMethodException e) {
+	    // FIXME: this isn't good...
+	    throw new Error("this is impossible");
+	}
     }
 
     Attr attr;
diff --git a/org/madore/damlengine/XemptyAttrHandler.java b/org/madore/damlengine/XemptyAttrHandler.java
new file mode 100644
index 0000000..3120d26
--- /dev/null
+++ b/org/madore/damlengine/XemptyAttrHandler.java
@@ -0,0 +1,14 @@
+package org.madore.damlengine;
+
+import org.w3c.dom.*;
+
+public class XemptyAttrHandler {
+
+    private XemptyAttrHandler() { }
+
+    public static void handle(TodoAttr that) {
+	that.owner.removeAttribute(that.attr.getName());
+	that.owner.appendChild(DamlEngine.doc.createComment(" EMPTY "));
+    }
+
+}
-- 
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