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annotate graal/com.oracle.max.base/src/com/sun/max/util/Registry.java @ 4142:bc8527f3071c

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Adjust code base to new level of warnings.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Sun, 18 Dec 2011 05:24:06 +0100
parents e233f5660da4
children
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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 }