Various trickeries to clarify weblog selection and inter-page links.

1 files changed, 55 insertions, 0 deletions

diff --git a/org/madore/damlengine/TodoWXrefAttr.java b/org/madore/damlengine/TodoWXrefAttr.java
new file mode 100644
index 0000000..dbc5511
--- /dev/null
+++ b/org/madore/damlengine/TodoWXrefAttr.java
@@ -0,0 +1,55 @@
+package org.madore.damlengine;
+
+import org.w3c.dom.*;
+
+public class TodoWXrefAttr extends TodoAttr {
+
+    public static class Factory extends TodoAttr.Factory {
+	@Override
+	public TodoWXrefAttr newItem(Attr attr, Element owner,
+				     Context ctx,
+				     TodoItem caller) {
+	    return new TodoWXrefAttr(attr, owner, ctx, caller);
+	}
+    }
+
+    public TodoWXrefAttr(Attr attr, Element owner,
+			 Context ctx,
+			 TodoItem caller) {
+	super(attr, owner, ctx, caller);
+    }
+
+    @Override
+    public void handle() {
+	String wxrefStr = attr.getValue();
+	if ( wxrefStr.equals("##weblog-selection-older") ) {
+	    if ( ctx.wsc == null )
+		throw new IllegalStateException("wxref attribute encountered with no weblog selection state");
+	    int prev = ctx.wsc.sel.first() - 1;
+	    WeblogSummary sum = WeblogSummary.getSummary();
+	    if ( sum != null && sum.entries != null
+		 && sum.entries.containsKey(new Integer(prev)) ) {
+		WeblogSummary.EntrySummary ent
+		    = sum.entries.get(new Integer(prev));
+		String target = "#d." + ent.date + "."
+		    + String.format("%04d", ent.id);
+		this.owner.removeAttributeNode(this.attr);
+		Attr newAttr
+		    = ctx.doc.createAttributeNS(DamlEngine.DAML_NS, "d:wref");
+		newAttr.setValue(target);
+		this.owner.setAttributeNodeNS(newAttr);
+		this.ownerDeque.registerAtStart(new TodoWrefAttr(newAttr, this.owner,
+								 this.ctx, this));
+	    } else {
+		String target = ((ctx.gc.uriToTop==null)?"":(ctx.gc.uriToTop+"weblog/"))
+		    + "weblog-index.html";
+		this.owner.removeAttributeNode(this.attr);
+		Attr newAttr = ctx.doc.createAttributeNS(null, "href");
+		newAttr.setValue(target);
+		this.owner.setAttributeNodeNS(newAttr);
+	    }
+	} else
+	    throw new IllegalArgumentException("couldn't understand argument to wxref attribute");
+    }
+
+}