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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. |
|
| 6 | * You may obtain a copy of the License at |
|
| 7 | * |
|
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
|
| 9 | * |
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| 10 | * Unless required by applicable law or agreed to in writing, software |
|
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
|
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
|
| 13 | * See the License for the specific language governing permissions and |
|
| 14 | * limitations under the License. |
|
| 15 | */ |
|
| 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. |
|
| 24 | */ |
|
| 25 | 0 | public class ClassLoaderUtils { |
| 26 | ||
| 27 | /** log for debug etc output */ |
|
| 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 | } |
|
| 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> |
|
| 61 | */ |
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| 62 | public static ClassLoader getClassLoader(ClassLoader specifiedLoader, Class callingClass) { |
|
| 63 | 0 | if (specclass="keyword">ifiedLoader != null) { |
| 64 | 0 | return specifiedLoader; |
| 65 | } |
|
| 66 | 0 | return getClassLoader(callingClass); |
| 67 | } |
|
| 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 { |
|
| 91 | 156 | return loader.loadClass(className); |
| 92 | } |
|
| 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> |
|
| 101 | * </ol> |
|
| 102 | */ |
|
| 103 | public static Class loadClass(String className, ClassLoader specifiedLoader, boolean useContextLoader, Class callingClass) throws ClassNotFoundException { |
|
| 104 | 0 | Class clazz = null; |
| 105 | 0 | if (specclass="keyword">ifiedLoader != null) { |
| 106 | try { |
|
| 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 | } |
|
| 112 | 0 | if (clazz == null && useContextLoader) { |
| 113 | 0 | ClassLoader contextLoader = Thread.currentThread().getContextClassLoader(); |
| 114 | 0 | if (contextLoader != null) { |
| 115 | try { |
|
| 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 | } |
|
| 121 | } |
|
| 122 | 0 | if (clazz == null) { |
| 123 | 0 | ClassLoader loader = getClassLoader(callingClass); |
| 124 | 0 | clazz = loader.loadClass(className); |
| 125 | } |
|
| 126 | 0 | return clazz; |
| 127 | } |
|
| 128 | } |
| This report is generated by jcoverage, Maven and Maven JCoverage Plugin. |