01: /*
02: * Copyright (C) 2004 TiongHiang Lee
03: *
04: * This library is free software; you can redistribute it and/or
05: * modify it under the terms of the GNU Lesser General Public
06: * License as published by the Free Software Foundation; either
07: * version 2.1 of the License, or (at your option) any later version.
08: *
09: * 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 Free Software
16: * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17: *
18: * Email: thlee@onemindsoft.org
19: */
20:
21: package org.onemind.jxp.util;
22:
23: import java.util.Map;
24: import org.onemind.commons.java.lang.ref.SoftHashMap;
25:
26: /**
27: * Utilities for discovering static imports
28: * @author TiongHiang Lee (thlee@onemindsoft.org)
29: */
30: public class StaticImportUtils {
31:
32: /** the cache for static import **/
33: private static Map _cache = new SoftHashMap(100);
34:
35: /**
36: * Constructor
37: */
38: private StaticImportUtils() {
39: }
40:
41: /**
42: * Get a static import
43: * @param c the class
44: * @return the static import
45: */
46: public static synchronized StaticImport getStaticImport(Class c) {
47: StaticImport si = (StaticImport) _cache.get(c);
48: if (si == null) {
49: synchronized (c) {
50: si = (StaticImport) _cache.get(c);
51: if (si == null) {
52: si = new StaticImport(c);
53: _cache.put(c, si);
54: }
55: }
56: }
57: return si;
58: }
59: }
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