WIP: Convenient document creation utilities.

[jsvc.git] / src / dolda / jsvc / next / DocBuffer.java

diff --git a/src/dolda/jsvc/next/DocBuffer.java b/src/dolda/jsvc/next/DocBuffer.java
new file mode 100644 (file)
index 0000000..432d817
--- /dev/null
+++ b/src/dolda/jsvc/next/DocBuffer.java
@@ -0,0 +1,73 @@
+package dolda.jsvc.next;
+
+import java.util.*;
+import org.w3c.dom.*;
+
+public class DocBuffer {
+    public final Document doc;
+    private final Map<String, Node> cursors = new HashMap<String, Node>();
+    public static final String ns = "jsvc:next:buffer";
+    
+    public DocBuffer(String ns, String root, String doctype, String pubid, String sysid) {
+       doc = DomUtil.document(ns, root, doctype, pubid, sysid);
+    }
+
+    public DocBuffer(String ns, String root) {
+       this(ns, root, null, null, null);
+    }
+    
+    private Node findcursor(Node c, String name) {
+       if(c instanceof Element) {
+           Element el = (Element)c;
+           if(el.getNamespaceURI().equals(ns) && el.getTagName().equals("cursor") && el.getAttributeNS(ns, "name").equals(name))
+               return(c);
+       }
+       for(Node n = c.getFirstChild(); n != null; n = n.getNextSibling()) {
+           Node r = findcursor(n, name);
+           if(r != null)
+               return(r);
+       }
+       return(null);
+    }
+
+    private Node cursor(String name) {
+       Node n;
+       if((n = cursors.get(name)) != null) {
+           return(n);
+       }
+       if((n = findcursor(doc, name)) == null)
+           return(null);
+       cursors.put(name, n);
+       return(n);
+    }
+    
+    public void insert(String cursor, Node n) {
+       Node c = cursor(cursor);
+       if(c == null)
+           throw(new RuntimeException("No such cursor: `" + cursor + "'"));
+       c.getParentNode().insertBefore(c, doc.importNode(n, true));
+    }
+    
+    public Element makecursor(String name) {
+       Element el = doc.createElementNS(ns, "cursor");
+       Attr a = doc.createAttributeNS(ns, "name");
+       a.setValue(name);
+       el.setAttributeNodeNS(a);
+       return(el);
+    }
+
+    public Element el(String ns, String nm, Node contents, String... attrs) {
+       Element el = doc.createElementNS(ns, nm);
+       if(contents != null)
+           el.appendChild(contents);
+       for(String attr : attrs) {
+           int p = attr.indexOf('=');
+           el.setAttribute(attr.substring(0, p), attr.substring(p + 1));
+       }
+       return(el);
+    }
+    
+    public Text text(String text) {
+       return(doc.createTextNode(text));
+    }
+}