Mercurial > hg > truffle
comparison graal/com.oracle.max.base/src/com/sun/max/util/Registry.java @ 3733:e233f5660da4
Added Java files from Maxine project.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Sat, 17 Dec 2011 19:59:18 +0100 |
parents | |
children | bc8527f3071c |
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3732:3e2e8b8abdaf | 3733:e233f5660da4 |
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1 /* | |
2 * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved. | |
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
20 * or visit www.oracle.com if you need additional information or have any | |
21 * questions. | |
22 */ | |
23 package com.sun.max.util; | |
24 | |
25 import java.util.*; | |
26 | |
27 import com.sun.max.program.*; | |
28 | |
29 /** | |
30 * The {@code Registry} class implements a type of configuration mechanism | |
31 * that allows a short string name (called an alias) to refer to a class name. | |
32 * The short name can be used to quickly look up an internally registered class and | |
33 * instantiate it (assuming the target class as a public constructor which takes | |
34 * no parameters). If the alias is not registered, the registry will try to use | |
35 * the alias as a fully-qualified Java class and load it using reflection. | |
36 */ | |
37 public class Registry<C> { | |
38 | |
39 protected final boolean loadClass; | |
40 protected final Class<C> classClass; | |
41 protected final Map<String, Class<? extends C>> classMap; | |
42 protected final Map<String, C> objectMap; | |
43 protected final Map<String, String> stringMap; | |
44 | |
45 public Registry(Class<C> classType, boolean loadClass) { | |
46 this.loadClass = loadClass; | |
47 this.classClass = classType; | |
48 this.classMap = new HashMap<String, Class<? extends C>>(); | |
49 this.objectMap = new HashMap<String, C>(); | |
50 this.stringMap = new HashMap<String, String>(); | |
51 } | |
52 | |
53 public void registerObject(String alias, C object) { | |
54 objectMap.put(alias, object); | |
55 } | |
56 | |
57 public void registerClass(String alias, Class<? extends C> classType) { | |
58 classMap.put(alias, classType); | |
59 } | |
60 | |
61 public void registerClass(String alias, String className) { | |
62 stringMap.put(alias, className); | |
63 } | |
64 | |
65 public C getInstance(String alias) { | |
66 return getInstance(alias, true); | |
67 } | |
68 | |
69 public C getInstance(String alias, boolean fatal) { | |
70 final C object = objectMap.get(alias); | |
71 if (object != null) { | |
72 return object; | |
73 } | |
74 Class<? extends C> classRef = classMap.get(alias); | |
75 String className = alias; | |
76 try { | |
77 if (classRef == null) { | |
78 className = stringMap.get(alias); | |
79 if (className != null) { | |
80 classRef = Class.forName(className).asSubclass(classClass); | |
81 } else if (loadClass) { | |
82 classRef = Class.forName(alias).asSubclass(classClass); | |
83 } else { | |
84 return genError(fatal, "cannot find alias", alias, className); | |
85 } | |
86 } | |
87 className = classRef.getName(); | |
88 return classRef.newInstance(); | |
89 } catch (ClassNotFoundException e) { | |
90 return genError(fatal, "cannot find class", alias, className); | |
91 } catch (InstantiationException e) { | |
92 return genError(fatal, "cannot instantiate class", alias, className); | |
93 } catch (IllegalAccessException e) { | |
94 return genError(fatal, "cannot instantiate class", alias, className); | |
95 } catch (ClassCastException e) { | |
96 return genError(fatal, "not a subclass of " + classClass.getName(), alias, className); | |
97 } | |
98 } | |
99 | |
100 public Iterable<String> getAliases() { | |
101 final LinkedList<String> lista = new LinkedList<String>(); | |
102 lista.addAll(objectMap.keySet()); | |
103 lista.addAll(classMap.keySet()); | |
104 lista.addAll(stringMap.keySet()); | |
105 return lista; | |
106 } | |
107 | |
108 private C genError(boolean fatal, String message, String alias, String className) { | |
109 if (!fatal) { | |
110 return null; | |
111 } | |
112 String mstr = message + ": " + alias; | |
113 if (className != null) { | |
114 mstr = mstr + "(" + className + ")"; | |
115 } | |
116 throw ProgramError.unexpected(mstr); | |
117 } | |
118 | |
119 public static <T> Registry<T> newRegistry(Class<T> cl) { | |
120 return new Registry<T>(cl, true); | |
121 } | |
122 } |