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annotate graal/com.oracle.max.base/src/com/sun/max/util/Registry.java @ 4231:d713eaf4d288
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author | Christian Wimmer <Christian.Wimmer@Oracle.com> |
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date | Thu, 05 Jan 2012 16:09:47 -0800 |
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1 /* |
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2 * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 */ |
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23 package com.sun.max.util; |
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24 |
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25 import java.util.*; |
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26 |
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27 import com.sun.max.program.*; |
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28 |
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29 /** |
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30 * The {@code Registry} class implements a type of configuration mechanism |
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31 * that allows a short string name (called an alias) to refer to a class name. |
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32 * The short name can be used to quickly look up an internally registered class and |
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33 * instantiate it (assuming the target class as a public constructor which takes |
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34 * no parameters). If the alias is not registered, the registry will try to use |
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35 * the alias as a fully-qualified Java class and load it using reflection. |
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36 */ |
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37 public class Registry<C> { |
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38 |
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39 protected final boolean loadClass; |
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40 protected final Class<C> classClass; |
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41 protected final Map<String, Class<? extends C>> classMap; |
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42 protected final Map<String, C> objectMap; |
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43 protected final Map<String, String> stringMap; |
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44 |
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45 public Registry(Class<C> classType, boolean loadClass) { |
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46 this.loadClass = loadClass; |
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47 this.classClass = classType; |
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48 this.classMap = new HashMap<>(); |
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49 this.objectMap = new HashMap<>(); |
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50 this.stringMap = new HashMap<>(); |
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51 } |
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52 |
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53 public void registerObject(String alias, C object) { |
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54 objectMap.put(alias, object); |
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55 } |
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56 |
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57 public void registerClass(String alias, Class<? extends C> classType) { |
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58 classMap.put(alias, classType); |
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59 } |
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60 |
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61 public void registerClass(String alias, String className) { |
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62 stringMap.put(alias, className); |
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63 } |
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64 |
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65 public C getInstance(String alias) { |
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66 return getInstance(alias, true); |
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67 } |
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68 |
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69 public C getInstance(String alias, boolean fatal) { |
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70 final C object = objectMap.get(alias); |
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71 if (object != null) { |
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72 return object; |
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73 } |
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74 Class<? extends C> classRef = classMap.get(alias); |
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75 String className = alias; |
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76 try { |
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77 if (classRef == null) { |
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78 className = stringMap.get(alias); |
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79 if (className != null) { |
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80 classRef = Class.forName(className).asSubclass(classClass); |
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81 } else if (loadClass) { |
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82 classRef = Class.forName(alias).asSubclass(classClass); |
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83 } else { |
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84 return genError(fatal, "cannot find alias", alias, className); |
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85 } |
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86 } |
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87 className = classRef.getName(); |
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88 return classRef.newInstance(); |
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89 } catch (ClassNotFoundException e) { |
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90 return genError(fatal, "cannot find class", alias, className); |
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91 } catch (InstantiationException e) { |
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92 return genError(fatal, "cannot instantiate class", alias, className); |
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93 } catch (IllegalAccessException e) { |
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94 return genError(fatal, "cannot instantiate class", alias, className); |
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95 } catch (ClassCastException e) { |
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96 return genError(fatal, "not a subclass of " + classClass.getName(), alias, className); |
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97 } |
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98 } |
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99 |
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100 public Iterable<String> getAliases() { |
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101 final LinkedList<String> lista = new LinkedList<>(); |
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102 lista.addAll(objectMap.keySet()); |
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103 lista.addAll(classMap.keySet()); |
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104 lista.addAll(stringMap.keySet()); |
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105 return lista; |
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106 } |
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107 |
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108 private C genError(boolean fatal, String message, String alias, String className) { |
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109 if (!fatal) { |
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110 return null; |
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111 } |
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112 String mstr = message + ": " + alias; |
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113 if (className != null) { |
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114 mstr = mstr + "(" + className + ")"; |
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115 } |
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116 throw ProgramError.unexpected(mstr); |
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117 } |
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118 |
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119 public static <T> Registry<T> newRegistry(Class<T> cl) { |
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120 return new Registry<>(cl, true); |
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121 } |
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122 } |