1 cananian 1.1.2.1 // CloningTempMap.java, created Sat Jan 23 02:05:02 1999 by cananian
2 cananian 1.1.2.1 // Copyright (C) 1999 C. Scott Ananian <cananian@alumni.princeton.edu>
3 cananian 1.1.2.1 // Licensed under the terms of the GNU GPL; see COPYING for details.
4 cananian 1.1.2.1 package harpoon.Temp;
5 cananian 1.1.2.1
6 cananian 1.1.2.1 import harpoon.Util.Util;
7 cananian 1.1.2.1
8 cananian 1.1.2.5 import java.util.Collections;
9 cananian 1.1.2.4 import java.util.HashMap;
10 cananian 1.1.2.4 import java.util.Map;
11 cananian 1.1.2.1 /**
12 cananian 1.1.2.1 * A <code>CloningTempMap</code> maps <code>Temp</code>s from one
13 cananian 1.1.2.4 * <code>TempFactory</code> to equivalent <code>Temp</code>s in another,
14 cananian 1.1.2.4 * creating new <code>Temp</code>s as necessary.
15 cananian 1.1.2.1 *
16 cananian 1.1.2.1 * @author C. Scott Ananian <cananian@alumni.princeton.edu>
17 cananian 1.5 * @version $Id: CloningTempMap.java,v 1.5 2002/09/01 07:39:25 cananian Exp $
18 cananian 1.1.2.1 */
19 cananian 1.1.2.1 public class CloningTempMap implements TempMap {
20 cananian 1.5 private final Map<Temp,Temp> h = new HashMap<Temp,Temp>();
21 cananian 1.1.2.1 private final TempFactory old_tf;
22 cananian 1.1.2.1 private final TempFactory new_tf;
23 cananian 1.1.2.1
24 cananian 1.1.2.1 /** Creates a <code>CloningTempMap</code>, given the
25 cananian 1.1.2.1 * source and destination <code>TempFactory</code>s.
26 cananian 1.1.2.1 */
27 cananian 1.1.2.1 public CloningTempMap(TempFactory old_tf, TempFactory new_tf) {
28 cananian 1.1.2.1 this.old_tf = old_tf; this.new_tf = new_tf;
29 cananian 1.3.2.1 assert old_tf != null : "old temp factory is null";
30 cananian 1.3.2.1 assert new_tf != null : "new temp factory is null";
31 cananian 1.1.2.1 }
32 cananian 1.1.2.1
33 cananian 1.1.2.4 /** Return a <code>Temp</code> from the <code>new_tf</code>
34 cananian 1.1.2.4 * <code>TempFactory</code> that corresponds to the specified
35 cananian 1.1.2.4 * <code>Temp</code> <code>t</code> from the <code>old_tf</code>
36 cananian 1.1.2.4 * <code>TempFactory</code>, creating it if necessary. */
37 cananian 1.1.2.1 public Temp tempMap(Temp t) {
38 cananian 1.3.2.1 assert t.tempFactory() == old_tf : "TempFactories should match";
39 cananian 1.5 Temp r = h.get(t);
40 cananian 1.1.2.1 if (r==null) {
41 cananian 1.1.2.1 r = t.clone(new_tf);
42 cananian 1.1.2.1 h.put(t, r);
43 cananian 1.1.2.1 }
44 cananian 1.3.2.1 assert r.tempFactory() == new_tf;
45 cananian 1.1.2.1 return r;
46 cananian 1.1.2.4 }
47 cananian 1.1.2.4
48 cananian 1.1.2.4 /** Provide access to an unmodifiable version of this
49 cananian 1.1.2.4 * <code>TempMap</code. */
50 cananian 1.1.2.4 public TempMap unmodifiable() {
51 cananian 1.1.2.4 return new TempMap() {
52 cananian 1.5 public Temp tempMap(Temp t) { return h.get(t); }
53 cananian 1.1.2.4 };
54 cananian 1.1.2.1 }
55 cananian 1.1.2.5 /** Provide access to an unmodifiable version of this
56 cananian 1.1.2.5 * <code>Temp</code> mapping, as a <code>java.util.Map</code>. */
57 cananian 1.5 public Map<Temp,Temp> asMap() { return Collections.unmodifiableMap(h); }
58 cananian 1.2 }