From 45fa82f3f6b98f3b6f81e8e753d8e7341dee14b5 Mon Sep 17 00:00:00 2001
From: "David A. Madore" <david@procyon.(none)>
Date: Tue, 13 Apr 2010 11:08:15 +0200
Subject: Start writing a todo item handling framework.

---
 org/madore/damlengine/DamlEngine.java     |  3 +++
 org/madore/damlengine/DefaultHandler.java | 11 ++++++++
 org/madore/damlengine/TodoItem.java       | 42 ++++++++++++++++++++++++++++---
 3 files changed, 53 insertions(+), 3 deletions(-)
 create mode 100644 org/madore/damlengine/DefaultHandler.java

(limited to 'org/madore/damlengine')

diff --git a/org/madore/damlengine/DamlEngine.java b/org/madore/damlengine/DamlEngine.java
index 441e970..6afa628 100644
--- a/org/madore/damlengine/DamlEngine.java
+++ b/org/madore/damlengine/DamlEngine.java
@@ -11,6 +11,8 @@ import org.apache.xerces.jaxp.DocumentBuilderFactoryImpl;
 
 public final class DamlEngine {
 
+    public static final String DAML_NS = "http://www.madore.org/~david/NS/daml/";
+
     private static Document doc;
 
     private DamlEngine() { }  // Forbid instantiation
@@ -22,6 +24,7 @@ public final class DamlEngine {
 	todoStack.add(new TodoItem(doc.getDocumentElement(),
 				   new HashMap<String,Object>(),
 				   options));
+	todoStack.removeFirst().dispatch();
 	// ...
     }
 
diff --git a/org/madore/damlengine/DefaultHandler.java b/org/madore/damlengine/DefaultHandler.java
new file mode 100644
index 0000000..6a2c174
--- /dev/null
+++ b/org/madore/damlengine/DefaultHandler.java
@@ -0,0 +1,11 @@
+package org.madore.damlengine;
+
+public class DefaultHandler {
+
+    private DefaultHandler() { }
+
+    public static void handle(TodoItem that) {
+	System.err.println("handling a "+that.node.getNodeName()+" node");
+    }
+
+}
diff --git a/org/madore/damlengine/TodoItem.java b/org/madore/damlengine/TodoItem.java
index e058ae2..941460e 100644
--- a/org/madore/damlengine/TodoItem.java
+++ b/org/madore/damlengine/TodoItem.java
@@ -1,13 +1,30 @@
 package org.madore.damlengine;
 
+import java.lang.reflect.Method;
+import java.lang.reflect.InvocationTargetException;
 import java.util.Map;
+import java.util.HashMap;
 import org.w3c.dom.Node;
 
 public class TodoItem {
 
-    protected Node node;
-    protected Map<String,Object> context;
-    protected Map<String,Object> options;
+    protected static Map<String,Method> damlHandlers;
+    protected static Method defaultHandler;
+
+    {
+	Class[] handlerArgTypes = new Class[]{ TodoItem.class };
+	damlHandlers = new HashMap<String,Method>();
+	try {
+	    defaultHandler = DefaultHandler.class.getMethod("handle", handlerArgTypes);
+	} catch (NoSuchMethodException e) {
+	    // FIXME: this isn't good...
+	    throw new Error("this is impossible");
+	}
+    }
+
+    Node node;
+    Map<String,Object> context;
+    Map<String,Object> options;
 
     public TodoItem(Node node, Map<String,Object> context, Map<String,Object> options) {
 	this.node = node;
@@ -15,4 +32,23 @@ public class TodoItem {
 	this.options = options;
     }
 
+    public void dispatch() {
+	Method handler;
+	if ( node.getNamespaceURI().equals(DamlEngine.DAML_NS) ) {
+	    handler = damlHandlers.get(node.getLocalName());
+	    if ( handler == null )
+		handler = defaultHandler;
+	} else
+	    handler = defaultHandler;
+	try {
+	    handler.invoke(null, new Object[]{this});
+	} catch (IllegalAccessException e) {
+	    // FIXME: this isn't good...
+	    throw new Error("this is impossible");
+	} catch (InvocationTargetException e) {
+	    // FIXME: this isn't good...
+	    throw new Error("this is impossible");
+	}
+    }
+
 }
-- 
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