Move ad hoc serializer to an "Unparser" class (ugly and unfinished).

1 files changed, 88 insertions, 0 deletions

diff --git a/org/madore/damlengine/Unparser.java b/org/madore/damlengine/Unparser.java
new file mode 100644
index 0000000..a903523
--- /dev/null
+++ b/org/madore/damlengine/Unparser.java
@@ -0,0 +1,88 @@
+package org.madore.damlengine;
+
+import java.io.Writer;
+import java.io.IOException;
+import org.w3c.dom.*;
+
+public final class Unparser {
+
+    private Node cursor;
+    private enum Dir { PUSHING, POPPING };
+    private Dir dir;
+    private Writer out;
+
+    public Unparser(Document doc, Writer out) {
+	cursor = doc;
+	dir = Dir.PUSHING;
+	this.out = out;
+    }
+
+    protected void skip() {
+	Node nsib = cursor.getNextSibling();
+	if ( nsib == null ) {
+	    cursor = cursor.getParentNode();
+	    dir = Dir.POPPING;
+	} else {
+	    cursor = nsib;
+	    dir = Dir.PUSHING;
+	}
+    }
+
+    protected void unparseOne()
+	throws IOException {
+	switch ( dir ) {
+	case PUSHING:
+	    if ( cursor.getNodeType() == Node.ELEMENT_NODE ) {
+		Element elt = (Element)cursor;
+		out.write("<"+elt.getTagName());
+		if ( elt.hasAttributes() ) {
+		    NamedNodeMap attrs = elt.getAttributes();
+		    Node n2;
+		    for ( int i=0 ; (n2=attrs.item(i)) != null ; i++ ) {
+			Attr attr = (Attr)n2;
+			out.write(" "+attr.getName()
+				  +"=\"(value)\"");
+		    }
+		}
+		if ( ! elt.hasChildNodes() ) {
+		    out.write(" />");
+		    skip();
+		} else {
+		    out.write(">");
+		    cursor = elt.getFirstChild();
+		}
+	    } else if ( cursor.getNodeType() == Node.DOCUMENT_NODE ) {
+		cursor = cursor.getFirstChild();
+		skip();
+	    } else if ( cursor.getNodeType() == Node.TEXT_NODE ) {
+		out.write("(text)");
+		skip();
+	    } else if ( cursor.getNodeType() == Node.COMMENT_NODE ) {
+		out.write("<!--(comment)-->");
+		skip();
+	    } else if ( cursor.getNodeType() == Node.CDATA_SECTION_NODE ) {
+		out.write("<![CDATA[(cdata)]]>");
+		skip();
+	    } else {
+		out.write("<!--(some other kind of node)-->");
+		skip();
+	    }
+	    break;
+	case POPPING:
+	    if ( cursor.getNodeType() == Node.ELEMENT_NODE ) {
+		Element elt = (Element)cursor;
+		out.write("</"+elt.getTagName()+">");
+	    }
+	    skip();
+	    break;
+	}
+    }
+
+    public void unparse()
+	throws IOException {
+	while ( cursor != null ) {
+	    unparseOne();
+	}
+    }
+
+}