X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=src%2Fedu%2Fberkeley%2Fsbp%2FTree.java;h=bffc35303e14658eeb4a83e7762b9576ce87d853;hb=80a840adb5df31ba5edd20ecac23086ad09a5ca1;hp=220d1ddc0574977bf5a160c41e090328f8cc9f4f;hpb=b318adb49d46a596314d7b7c0dd9f52681abb449;p=sbp.git

diff --git a/src/edu/berkeley/sbp/Tree.java b/src/edu/berkeley/sbp/Tree.java
index 220d1dd..bffc353 100644
--- a/src/edu/berkeley/sbp/Tree.java
+++ b/src/edu/berkeley/sbp/Tree.java
@@ -7,7 +7,10 @@ import java.util.*;
 import java.lang.reflect.*;
 
 /** a tree (or node in a tree); see jargon.txt for details */
-public class Tree<T> extends PrintableTree<Tree<T>> implements Iterable<Tree<T>> {
+public class Tree<T>
+    extends PrintableTree<Tree<T>>
+    implements Iterable<Tree<T>>,
+               GraphViz.ToGraphViz {
 
     final T           head;
           Tree<T>[]   children;
@@ -43,4 +46,36 @@ public class Tree<T> extends PrintableTree<Tree<T>> implements Iterable<Tree<T>>
     protected String left()   { return "{"; }
     protected String right()  { return "}"; }
     protected boolean ignoreSingleton() { return false; }
+
+    public GraphViz.Node toGraphViz(GraphViz gv) {
+        if (gv.hasNode(this)) return gv.createNode(this);
+        GraphViz.Node n = gv.createNode(this);
+        n.label = head()==null ? "" : head().toString();
+        //n.color = "red";
+        for(Tree t : this) n.edge(t, null);
+        return n;
+    }
+    public boolean isTransparent() { return false; }
+    public boolean isHidden() { return false; }
+
+    public static interface TreeFunctor<T,R> extends Functor<Iterable<Tree<T>>, R> {
+    }
+
+    public static class ArrayBuildingTreeFunctor<T> implements TreeFunctor<T,T[]> {
+        public String toString() { return ""; }
+        public T[] invoke(Iterable<Tree<T>> t) {
+            ArrayList ret = new ArrayList();
+            for(Tree tc : t) {
+                if (tc.head() != null && tc.head() instanceof Functor)
+                    ret.add(((Functor<Iterable<Tree>,Object>)tc.head()).invoke(tc.children()));
+                else if (tc.numChildren() == 0)
+                    ret.add(tc.head());
+                else {
+                    System.err.println("FIXME: don't know what to do about " + tc);
+                    ret.add(null);
+                }
+            }
+            return (T[])ret.toArray(new Object[0]);
+        }
+    }
 }