X-Git-Url: http://git.megacz.com/?p=sbp.git;a=blobdiff_plain;f=src%2Fedu%2Fberkeley%2Fsbp%2FResult.java;h=9db5aeeb1abbfd7df1d9627195b3f2d5bad93ba3;hp=8eccf96eb4d9cfbee7e8b374267cf840ac5818e0;hb=954c6edf9a45f16463c4afc2a2f1abe940c6b184;hpb=e84029a8b861075d6d0ed5040f919b2e4da4c98f

diff --git a/src/edu/berkeley/sbp/Result.java b/src/edu/berkeley/sbp/Result.java
index 8eccf96..9db5aee 100644
--- a/src/edu/berkeley/sbp/Result.java
+++ b/src/edu/berkeley/sbp/Result.java
@@ -1,31 +1,80 @@
 // Copyright 2006 all rights reserved; see LICENSE file for BSD-style license
 
 package edu.berkeley.sbp;
-import edu.berkeley.sbp.*;
 import edu.berkeley.sbp.util.*;
-import edu.berkeley.sbp.Parser.Table.*;
 import edu.berkeley.sbp.Sequence.Position;
-import java.io.*;
 import java.util.*;
-import java.lang.reflect.*;
 
-class Result {
+final class Result implements GraphViz.ToGraphViz {
 
     private Forest f;
     private Node parent;
     private GSS.Phase phase;
     private Position reduction;
+    private HashSet<Node> children = new HashSet<Node>();
+    private boolean destroyed = false;
+    private int usedByNonDoomedNode = 0;
 
     public Position reduction() { return reduction; }
     public GSS.Phase phase() { return phase; }
     public Forest getForest() { return f; }
     public Node parent() { return parent; }
+    public void addChild(Node child) {
+        children.add(child);
+        usedByNonDoomedNode += child.state().doomed ? 0 : 1;
+    }
+    public void removeChild(Node child) {
+        children.remove(child);
+        usedByNonDoomedNode -= child.state().doomed ? 0 : 1;
+    }
+
+    public boolean usedByAnyNode() { return children.size() > 0; }
+    public boolean usedByNonDoomedNode() { return usedByNonDoomedNode > 0; }
+
+    public String toString() { return super.toString()+"->"+parent(); }
+
+    public void check() { if (children.size()==0) destroy(); }
+    public void destroy() {
+        if (destroyed) return;
+        if (parent==null) return;  // never destroy the "primordeal" result
+        destroyed = true;
+        if (parent() != null) {
+            parent().removeChild(this);
+            parent().check();
+        }
+        OUTER: while(true) {
+            for(Node n : children) {
+                children.remove(n);
+                n.removeResult(this);
+                n.check();
+                continue OUTER;
+            }
+            break;
+        }
+    }
 
     public Result(Forest f, Node parent, Position reduction) {
         this.f = f;
         this.reduction = reduction;
         this.parent = parent;
+        if (parent != null) parent.addChild(this);
         if (parent != null) phase = parent.phase();
     }
 
+    // GraphViz //////////////////////////////////////////////////////////////////////////////
+
+    public GraphViz.Node toGraphViz(GraphViz gv) {
+        if (gv.hasNode(this)) return gv.createNode(this);
+        GraphViz.Node n = gv.createNode(this);
+        n.label = ""+f;
+        n.shape = "rectangle";
+        if (parent()!=null) n.edge(parent, "");
+        n.color = "blue";
+        if (phase() != null)
+            ((GraphViz.Group)phase().toGraphViz(gv)).add(n);
+        return n;
+    }
+    public boolean isTransparent() { return false; }
+    public boolean isHidden() { return false; }
+
 }
\ No newline at end of file