Filter


1   /* Soot - a J*va Optimization Framework
2    * Copyright (C) 2003 Ondrej Lhotak
3    *
4    * This library is free software; you can redistribute it and/or
5    * modify it under the terms of the GNU Lesser General Public
6    * License as published by the Free Software Foundation; either
7    * version 2.1 of the License, or (at your option) any later version.
8    *
9    * This library is distributed in the hope that it will be useful,
10   * but WITHOUT ANY WARRANTY; without even the implied warranty of
11   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12   * Lesser General Public License for more details.
13   *
14   * You should have received a copy of the GNU Lesser General Public
15   * License along with this library; if not, write to the
16   * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17   * Boston, MA 02111-1307, USA.
18   */
19  
20  package soot.jimple.toolkits.callgraph;
21  import soot.*;
22  import soot.util.queue.*;
23  import java.util.*;
24  
25  /** Represents a subset of the edges in a call graph satisfying an EdgePredicate
26   * predicate.
27   * @author Ondrej Lhotak
28   */
29  public class Filter implements Iterator
30  { 
31      private Iterator source;
32      private EdgePredicate pred;
33      private Edge next = null;
34      public Filter( EdgePredicate pred ) {
35          this.pred = pred;
36      }
37      public Iterator wrap( Iterator source ) {
38          this.source = source;
39          advance();
40          return this;
41      }
42      private void advance() {
43          while( source.hasNext() ) {
44              next = (Edge) source.next();
45              if( pred.want( next ) ) {
46                  return;
47              }
48          }
49          next = null;
50      }
51      public boolean hasNext() {
52          return next != null;
53      }
54      public Object   next() {
55          Object   ret = next;
56          advance();
57          return ret;
58      }
59      public void remove() {
60          throw new UnsupportedOperationException  (); 
61      }
62  }
63  
64
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