source: fedd/abac-src/rbtm/engine/PartialSolutionMap.java @ 3c20a31

axis_examplecompt_changesinfo-opsversion-1.30version-2.00version-3.01version-3.02
Last change on this file since 3c20a31 was 8780cbec, checked in by Jay Jacobs <Jay.Jacobs@…>, 15 years ago

ABAC sources from Cobham

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[8780cbec]1package edu.stanford.peer.rbtm.engine;
2
3import java.util.*;
4import edu.stanford.peer.rbtm.credential.*;
5/**
6 * A map which keeps track of how many partial solutions reach a proof node,
7 * using a decrementing counter, which is initialized to k for each
8 * intersection.
9 */
10public class PartialSolutionMap
11{
12         /** table of decrementing counters, one per intersection */
13         HashMap counters = new HashMap();
14
15         /** get the count of outstanding partial solutions */
16         public int getPartialSolutionCount(Intersection inter) {
17                  return ((Integer)counters.get(inter)).intValue();
18         }
19         
20         /**
21          * decrement the counter by 1 for the specified intersect, creating a
22          * new counter, if necessary
23          */
24         public boolean addPartialSolution(Intersection inter,EntityExpression expr)
25         {
26                  int partialSolutionCount = -1;
27                  try {
28                                partialSolutionCount = getPartialSolutionCount(inter);
29                  } catch(NullPointerException nullEx) {
30                                partialSolutionCount = inter.getPartsCount();
31                  } catch(Exception ex) {
32                                ex.printStackTrace();
33                  }
34                  counters.put(inter, new Integer(--partialSolutionCount));
35                  return (partialSolutionCount == 0)? true: false;
36         }
37}
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