code-generator/binding-generator-impl/src/main/java/org/opendaylight/yangtools/sal/binding/generator/util/ClassLoaderUtils.java

   1 /*
   2  * Copyright (c) 2014 Cisco Systems, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.opendaylight.yangtools.sal.binding.generator.util;
   9
  10 import static com.google.common.base.Preconditions.checkNotNull;
  11
  12 import java.lang.reflect.Constructor;
  13 import java.lang.reflect.InvocationTargetException;
  14 import java.util.Arrays;
  15 import java.util.List;
  16 import java.util.concurrent.Callable;
  17 import java.util.concurrent.locks.Lock;
  18
  19 import com.google.common.base.Joiner;
  20 import com.google.common.base.Optional;
  21
  22 /**
  23  * @deprecated Use {@link org.opendaylight.yangtools.yang.binding.util.ClassLoaderUtils} instead.
  24  */
  25 @Deprecated
  26 public final class ClassLoaderUtils {
  27
  28     private ClassLoaderUtils() {
  29         throw new UnsupportedOperationException("Utility class");
  30     }
  31
  32     public static <V> V withClassLoader(final ClassLoader cls, final Callable<V> function) throws Exception {
  33         checkNotNull(cls, "Classloader should not be null");
  34         checkNotNull(function, "Function should not be null");
  35
  36         final ClassLoader oldCls = Thread.currentThread().getContextClassLoader();
  37         try {
  38             Thread.currentThread().setContextClassLoader(cls);
  39             return function.call();
  40         } finally {
  41             Thread.currentThread().setContextClassLoader(oldCls);
  42         }
  43     }
  44
  45     public static <V> V withClassLoaderAndLock(final ClassLoader cls, final Lock lock, final Callable<V> function) throws Exception {
  46         checkNotNull(lock, "Lock should not be null");
  47
  48         lock.lock();
  49         try {
  50             return withClassLoader(cls, function);
  51         } finally {
  52             lock.unlock();
  53         }
  54     }
  55
  56     /**
  57      * @deprecated Use one of the other utility methods.
  58      */
  59     @Deprecated
  60     public static <V> V withClassLoaderAndLock(final ClassLoader cls, final Optional<Lock> lock, final Callable<V> function) throws Exception {
  61         if (lock.isPresent()) {
  62             return withClassLoaderAndLock(cls, lock.get(), function);
  63         } else {
  64             return withClassLoader(cls, function);
  65         }
  66     }
  67
  68     public static Object construct(final Constructor<? extends Object> constructor, final List<Object> objects)
  69             throws InstantiationException, IllegalAccessException, IllegalArgumentException, InvocationTargetException {
  70         Object[] initargs = objects.toArray(new Object[] {});
  71         return constructor.newInstance(initargs);
  72     }
  73
  74
  75     public static Class<?> loadClass(final ClassLoader cls, final String name) throws ClassNotFoundException {
  76         if ("byte[]".equals(name)) {
  77             return byte[].class;
  78         } else if("char[]".equals(name)) {
  79             return char[].class;
  80         }
  81         try {
  82             return cls.loadClass(name);
  83         } catch (ClassNotFoundException e) {
  84             String[] components = name.split("\\.");
  85             String potentialOuter;
  86             int length = components.length;
  87             if (length > 2 && (potentialOuter = components[length - 2]) != null && Character.isUpperCase(potentialOuter.charAt(0))) {
  88
  89                     String outerName = Joiner.on(".").join(Arrays.asList(components).subList(0, length - 1));
  90                     String innerName = outerName + "$" + components[length-1];
  91                     return cls.loadClass(innerName);
  92             } else {
  93                 throw e;
  94             }
  95         }
  96     }
  97
  98     public static Class<?> loadClassWithTCCL(final String name) throws ClassNotFoundException {
  99         return loadClass(Thread.currentThread().getContextClassLoader(), name);
 100     }
 101
 102     public static Class<?> tryToLoadClassWithTCCL(final String fullyQualifiedName) {
 103         try {
 104             return loadClassWithTCCL(fullyQualifiedName);
 105         } catch (ClassNotFoundException e) {
 106             return null;
 107         }
 108     }
 109 }