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org.apache.commons.jelly.util.ClassLoaderUtils |
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1 | /* |
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2 | * Copyright 2002,2004 The Apache Software Foundation. |
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3 | * |
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4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
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5 | * you may not use this file except in compliance with the License. |
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6 | * You may obtain a copy of the License at |
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7 | * |
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8 | * http://www.apache.org/licenses/LICENSE-2.0 |
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9 | * |
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10 | * Unless required by applicable law or agreed to in writing, software |
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11 | * distributed under the License is distributed on an "AS IS" BASIS, |
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12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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13 | * See the License for the specific language governing permissions and |
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14 | * limitations under the License. |
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15 | */ |
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16 | ||
17 | package org.apache.commons.jelly.util; |
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18 | ||
19 | import org.apache.commons.logging.Log; |
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20 | import org.apache.commons.logging.LogFactory; |
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21 | ||
22 | /** |
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23 | * A class to centralize the class loader management code. |
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24 | */ |
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25 | 0 | public class ClassLoaderUtils { |
26 | ||
27 | /** log for debug etc output */ |
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28 | 572 | private static final Log log = LogFactory.getLog(ClassLoaderUtils.class); |
29 | ||
30 | /** |
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31 | * Return the class loader to be used for instantiating application objects |
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32 | * when required. This is determined based upon the following rules: |
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33 | * <ul> |
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34 | * <li>The specified class loader, if any</li> |
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35 | * <li>The thread context class loader, if it exists and <code>useContextClassLoader</code> is true</li> |
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36 | * <li>The class loader used to load the calling class. |
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37 | * <li>The System class loader. |
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38 | * </ul> |
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39 | */ |
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40 | public static ClassLoader getClassLoader(ClassLoader specifiedLoader, boolean useContextClassLoader, Class callingClass) { |
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41 | 1781 | if (specclass="keyword">ifiedLoader != null) { |
42 | 0 | return specifiedLoader; |
43 | } |
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44 | 1781 | if (useContextClassLoader) { |
45 | 0 | ClassLoader classLoader = Thread.currentThread().getContextClassLoader(); |
46 | 0 | if (classLoader != null) { |
47 | 0 | return classLoader; |
48 | } |
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49 | } |
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50 | 1781 | return getClassLoader(callingClass); |
51 | } |
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52 | ||
53 | /** |
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54 | * Return the class loader to be used for instantiating application objects |
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55 | * when a context class loader is not specified. This is determined based upon the following rules: |
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56 | * <ul> |
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57 | * <li>The specified class loader, if any</li> |
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58 | * <li>The class loader used to load the calling class. |
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59 | * <li>The System class loader. |
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60 | * </ul> |
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61 | */ |
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62 | public static ClassLoader getClassLoader(ClassLoader specifiedLoader, Class callingClass) { |
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63 | 0 | if (specclass="keyword">ifiedLoader != null) { |
64 | 0 | return specifiedLoader; |
65 | } |
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66 | 0 | return getClassLoader(callingClass); |
67 | } |
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68 | ||
69 | /** |
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70 | * Get the loader for the given class. |
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71 | * @param clazz the class to retrieve the loader for |
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72 | * @return the class loader that loaded the provided class |
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73 | */ |
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74 | public static ClassLoader getClassLoader(Class clazz) { |
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75 | 2639 | ClassLoader callersLoader = clazz.getClassLoader(); |
76 | 2639 | if (callersLoader == null) { |
77 | 0 | callersLoader = ClassLoader.getSystemClassLoader(); |
78 | } |
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79 | 2639 | return callersLoader; |
80 | } |
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81 | ||
82 | /** |
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83 | * Loads the given class using the current Thread's context class loader first |
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84 | * otherwise use the class loader which loaded this class. |
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85 | */ |
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86 | public static Class loadClass(String className, Class callingClass) throws ClassNotFoundException { |
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87 | 156 | ClassLoader loader = Thread.currentThread().getContextClassLoader(); |
88 | 156 | if (loader == null) { |
89 | 0 | return getClassLoader(callingClass).loadClass(className); |
90 | } else { |
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91 | 156 | return loader.loadClass(className); |
92 | } |
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93 | } |
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94 | ||
95 | /** |
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96 | * Loads the given class using: |
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97 | * <ol> |
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98 | * <li>the specified classloader,</li> |
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99 | * <li>the current Thread's context class loader first, if asked</li> |
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100 | * <li>otherwise use the class loader which loaded this class.</li> |
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101 | * </ol> |
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102 | */ |
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103 | public static Class loadClass(String className, ClassLoader specifiedLoader, boolean useContextLoader, Class callingClass) throws ClassNotFoundException { |
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104 | 0 | Class clazz = null; |
105 | 0 | if (specclass="keyword">ifiedLoader != null) { |
106 | try { |
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107 | 0 | clazz = specifiedLoader.loadClass(className); |
108 | 0 | } catch (ClassNotFoundException e) { |
109 | 0 | log.debug("couldn't find class in specified loader", e); |
110 | 0 | } |
111 | } |
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112 | 0 | if (clazz == null && useContextLoader) { |
113 | 0 | ClassLoader contextLoader = Thread.currentThread().getContextClassLoader(); |
114 | 0 | if (contextLoader != null) { |
115 | try { |
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116 | 0 | clazz = contextLoader.loadClass(className); |
117 | 0 | } catch (ClassNotFoundException e) { |
118 | 0 | log.debug("couldn't find class in specified loader", e); |
119 | 0 | } |
120 | } |
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121 | } |
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122 | 0 | if (clazz == null) { |
123 | 0 | ClassLoader loader = getClassLoader(callingClass); |
124 | 0 | clazz = loader.loadClass(className); |
125 | } |
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126 | 0 | return clazz; |
127 | } |
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128 | } |
This report is generated by jcoverage, Maven and Maven JCoverage Plugin. |