X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=src%2Fedu%2Fberkeley%2Fsbp%2FTree.java;h=38fcd32c8d2808afacd912a5b13f3b2c6d2ab924;hb=280f672a6fd0674a5dfca285791f1e465cac5c9e;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..38fcd32 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;
@@ -39,8 +42,51 @@ public class Tree<T> extends PrintableTree<Tree<T>> implements Iterable<Tree<T>>
     }
 
     protected String headToString() { return head==null?null:head.toString(); }
-    protected String headToJava()   { return head==null?null:StringUtil.toJavaString(head+""); }
+    protected String headToJava()   {
+        if (head==null) return null;
+        if (head instanceof ToJava) {
+            StringBuffer sb = new StringBuffer();
+            ((ToJava)head).toJava(sb);
+            return sb.toString();
+        }
+        return head==null?"null":("\""+StringUtil.toJavaString(head.toString())+"\"");
+    }
     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[]>, ToJava {
+
+        public void toJava(StringBuffer sb) { sb.append("new Tree.ArrayBuildingTreeFunctor()"); }
+        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]);
+        }
+    }
 }