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Merge pull request #401 from apache/bugfix/385-Allow-import-of-type-s…
…ystems-published-through-SPI Issue #385: Allow import of type systems published through SPI
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uimaj-core/src/main/java/org/apache/uima/internal/util/ClassLoaderUtils.java
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|---|---|---|
| @@ -0,0 +1,157 @@ | ||
| /* | ||
| * Licensed to the Apache Software Foundation (ASF) under one | ||
| * or more contributor license agreements. See the NOTICE file | ||
| * distributed with this work for additional information | ||
| * regarding copyright ownership. The ASF licenses this file | ||
| * to you under the Apache License, Version 2.0 (the | ||
| * "License"); you may not use this file except in compliance | ||
| * with the License. You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, | ||
| * software distributed under the License is distributed on an | ||
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | ||
| * KIND, either express or implied. See the License for the | ||
| * specific language governing permissions and limitations | ||
| * under the License. | ||
| */ | ||
| package org.apache.uima.internal.util; | ||
|
|
||
| import org.apache.uima.UIMAFramework; | ||
| import org.apache.uima.UimaContext; | ||
| import org.apache.uima.UimaContextAdmin; | ||
| import org.apache.uima.UimaContextHolder; | ||
| import org.apache.uima.resource.ResourceManager; | ||
|
|
||
| /** | ||
| * INTERNAL API - Helper functions to obtain a suitable class loader. | ||
| */ | ||
| public final class ClassLoaderUtils { | ||
| private ClassLoaderUtils() { | ||
| // No instances | ||
| } | ||
|
|
||
| /** | ||
| * Looks up a suitable class loader in the following order: | ||
| * | ||
| * <ol> | ||
| * <li>The {@link UimaContext} in the {@link UimaContextHolder} of the current thread(if any)</li> | ||
| * <li>The current thread-context class loader (if any)</li> | ||
| * <li>The class loader through which uimaFIT (i.e. this class) was loaded.</li> | ||
| * <li>For backwards compatibility then delegates to {@link #getDefaultClassLoader()}</li> | ||
| * </ol> | ||
| * | ||
| * @return a class loader or {@code null} if no suitable class loader could be found. | ||
| */ | ||
| public static ClassLoader findClassLoader() { | ||
| var uimaThreadContextClassLoader = getExtensionClassLoader(UimaContextHolder.getContext()); | ||
| if (uimaThreadContextClassLoader != null) { | ||
| return uimaThreadContextClassLoader; | ||
| } | ||
|
|
||
| var contextClassLoader = Thread.currentThread().getContextClassLoader(); | ||
| if (contextClassLoader != null) { | ||
| return contextClassLoader; | ||
| } | ||
|
|
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| var uimaFITClassLoader = ClassLoaderUtils.class.getClassLoader(); | ||
| if (uimaFITClassLoader != null) { | ||
| return uimaFITClassLoader; | ||
| } | ||
|
|
||
| return getDefaultClassLoader(); | ||
| } | ||
|
|
||
| /** | ||
| * Looks up a suitable class loader in the following order: | ||
| * | ||
| * <ol> | ||
| * <li>The extension class loader of the given {@link ResourceManager}</li> | ||
| * <li>See {@link #findClassLoader()}</li> | ||
| * </ol> | ||
| * | ||
| * @return a class loader or {@code null} if no suitable class loader could be found. | ||
| */ | ||
| public static ClassLoader findClassLoader(ResourceManager aResMgr) { | ||
| var resourceManagerExtensionClassloader = getExtensionClassLoader(aResMgr); | ||
| if (resourceManagerExtensionClassloader != null) { | ||
| return resourceManagerExtensionClassloader; | ||
| } | ||
|
|
||
| return findClassLoader(); | ||
| } | ||
|
|
||
| /** | ||
| * Looks up a suitable class loader in the following order: | ||
| * | ||
| * <ol> | ||
| * <li>The extension class loader of the {@link ResourceManager} associated with the given | ||
| * {@link UimaContext} (if any)</li> | ||
| * <li>See {@link #findClassLoader(ResourceManager)}</li> | ||
| * </ol> | ||
| * | ||
| * @return a class loader or {@code null} if no suitable class loader could be found. | ||
| */ | ||
| public static ClassLoader findClassLoader(UimaContext aContext) { | ||
| var uimaContextExtensionClassloader = getExtensionClassLoader(aContext); | ||
| if (uimaContextExtensionClassloader != null) { | ||
| return uimaContextExtensionClassloader; | ||
| } | ||
|
|
||
| return findClassLoader((ResourceManager) null); | ||
| } | ||
|
|
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| private static ClassLoader getExtensionClassLoader(UimaContext aContext) { | ||
| if (aContext instanceof UimaContextAdmin) { | ||
| return getExtensionClassLoader(((UimaContextAdmin) aContext).getResourceManager()); | ||
| } | ||
|
|
||
| return null; | ||
| } | ||
|
|
||
| private static ClassLoader getExtensionClassLoader(ResourceManager aResMgr) { | ||
| if (aResMgr == null) { | ||
| return null; | ||
| } | ||
|
|
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| var cl = aResMgr.getExtensionClassLoader(); | ||
| if (cl != null) { | ||
| return cl; | ||
| } | ||
|
|
||
| return null; | ||
| } | ||
|
|
||
| private static ClassLoader getDefaultClassLoader() { | ||
| ClassLoader cl; | ||
| try { | ||
| cl = Thread.currentThread().getContextClassLoader(); | ||
| if (cl != null) { | ||
| return cl; | ||
| } | ||
| } catch (Throwable ex) { | ||
| // Fall-through | ||
| } | ||
|
|
||
| try { | ||
| cl = UIMAFramework.class.getClassLoader(); | ||
| if (cl != null) { | ||
| return cl; | ||
| } | ||
| } catch (Throwable ex) { | ||
| // Fall-through | ||
| } | ||
|
|
||
| try { | ||
| cl = ClassLoader.getSystemClassLoader(); | ||
| if (cl != null) { | ||
| return cl; | ||
| } | ||
| } catch (Throwable ex) { | ||
| // Fall-through | ||
| } | ||
|
|
||
| return null; | ||
| } | ||
| } |
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