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[GORA-72] Made all artifacts proper OSGi bundles. Added ClassLoadingU…
…tils which will fallback to thread context classloader if Class.forName fails. git-svn-id: https://svn.apache.org/repos/asf/incubator/gora/trunk@1227229 13f79535-47bb-0310-9956-ffa450edef68
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64 changes: 64 additions & 0 deletions
64
gora-core/src/main/java/org/apache/gora/util/ClassLoadingUtils.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,64 @@ | ||
| package org.apache.gora.util; | ||
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| public class ClassLoadingUtils { | ||
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| private ClassLoadingUtils() { | ||
| //Utility Class | ||
| } | ||
|
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| /** | ||
| * Loads a class using the class loader. | ||
| * 1. The class loader of the current class is being used. | ||
| * 2. The thread context class loader is being used. | ||
| * If both approaches fail, returns null. | ||
| * | ||
| * @param className The name of the class to load. | ||
| * @return The class or null if no class loader could load the class. | ||
| */ | ||
| public static Class<?> loadClass(String className) throws ClassNotFoundException { | ||
| return ClassLoadingUtils.loadClass(ClassLoadingUtils.class,className); | ||
| } | ||
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| /** | ||
| * Loads a class using the class loader. | ||
| * 1. The class loader of the context class is being used. | ||
| * 2. The thread context class loader is being used. | ||
| * If both approaches fail, returns null. | ||
| * | ||
| * @param contextClass The name of a context class to use. | ||
| * @param className The name of the class to load | ||
| * @return The class or null if no class loader could load the class. | ||
| */ | ||
| public static Class<?> loadClass(Class<?> contextClass, String className) throws ClassNotFoundException { | ||
| Class<?> clazz = null; | ||
| if (contextClass.getClassLoader() != null) { | ||
| clazz = loadClass(className, contextClass.getClassLoader()); | ||
| } | ||
| if (clazz == null && Thread.currentThread().getContextClassLoader() != null) { | ||
| clazz = loadClass(className, Thread.currentThread().getContextClassLoader()); | ||
| } | ||
| if (clazz == null) { | ||
| throw new ClassNotFoundException("Failed to load class" + className); | ||
| } | ||
| return clazz; | ||
| } | ||
|
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| /** | ||
| * Loads a {@link Class} from the specified {@link ClassLoader} without throwing {@ClassNotFoundException}. | ||
| * | ||
| * @param className | ||
| * @param classLoader | ||
| * @return | ||
| */ | ||
| private static Class<?> loadClass(String className, ClassLoader classLoader) { | ||
| Class<?> clazz = null; | ||
| if (classLoader != null && className != null) { | ||
| try { | ||
| clazz = classLoader.loadClass(className); | ||
| } catch (ClassNotFoundException e) { | ||
| //Ignore and return null | ||
| } | ||
| } | ||
| return clazz; | ||
| } | ||
| } |
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