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 | */
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17 | package org.apache.tools.ant.util;
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18 |
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19 | import java.io.File;
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20 | import org.apache.tools.ant.BuildException;
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21 | import org.apache.tools.ant.launch.Locator;
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22 |
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23 | /**
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24 | * ClassLoader utility methods
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25 | *
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26 | */
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27 | public class LoaderUtils {
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28 | /**
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29 | * Set the context classloader
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30 | *
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31 | * @param loader the ClassLoader to be used as the context class loader
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32 | * on the current thread.
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33 | */
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34 | public static void setContextClassLoader(ClassLoader loader) {
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35 | Thread currentThread = Thread.currentThread();
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36 | currentThread.setContextClassLoader(loader);
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37 | }
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38 |
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39 |
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40 | /**
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41 | * JDK1.1 compatible access to set the context class loader.
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42 | *
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43 | * @return the ClassLoader instance being used as the context
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44 | * classloader on the current thread. Returns null on JDK 1.1
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45 | */
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46 | public static ClassLoader getContextClassLoader() {
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47 | Thread currentThread = Thread.currentThread();
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48 | return currentThread.getContextClassLoader();
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49 | }
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50 |
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51 | /**
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52 | * Indicates if the context class loader methods are available
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53 | *
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54 | * @return true if the get and set methods dealing with the context
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55 | * classloader are available.
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56 | */
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57 | public static boolean isContextLoaderAvailable() {
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58 | return true;
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59 | }
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60 |
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61 | /**
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62 | * Normalize a source location
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63 | *
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64 | * @param source the source location to be normalized.
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65 | *
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66 | * @return the normalized source location.
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67 | */
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68 | private static File normalizeSource(File source) {
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69 | if (source != null) {
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70 | FileUtils fileUtils = FileUtils.newFileUtils();
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71 | try {
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72 | source = fileUtils.normalize(source.getAbsolutePath());
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73 | } catch (BuildException e) {
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74 | // relative path
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75 | }
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76 | }
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77 |
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78 | return source;
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79 | }
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80 |
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81 | /**
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82 | * Find the directory or jar file the class has been loaded from.
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83 | *
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84 | * @param c the class whose location is required.
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85 | * @return the file or jar with the class or null if we cannot
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86 | * determine the location.
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87 | *
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88 | * @since Ant 1.6
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89 | */
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90 | public static File getClassSource(Class c) {
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91 | return normalizeSource(Locator.getClassSource(c));
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92 | }
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93 |
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94 | /**
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95 | * Find the directory or a give resource has been loaded from.
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96 | *
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97 | * @param c the classloader to be consulted for the source
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98 | * @param resource the resource whose location is required.
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99 | *
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100 | * @return the file with the resource source or null if
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101 | * we cannot determine the location.
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102 | *
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103 | * @since Ant 1.6
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104 | */
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105 | public static File getResourceSource(ClassLoader c, String resource) {
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106 | if (c == null) {
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107 | c = LoaderUtils.class.getClassLoader();
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108 | }
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109 | return normalizeSource(Locator.getResourceSource(c, resource));
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110 | }
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111 | }
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112 |
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