author | mkos |
Fri, 30 Oct 2015 10:34:46 +0100 | |
changeset 33547 | e4c76ac38b12 |
parent 29953 | d5894097fe65 |
child 36523 | 116e5d5cdade |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package com.sun.xml.internal.bind.v2; |
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import java.lang.reflect.Constructor; |
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import java.lang.reflect.InvocationTargetException; |
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import java.lang.reflect.Method; |
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import java.lang.reflect.Modifier; |
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import java.lang.ref.WeakReference; |
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import java.security.AccessController; |
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import java.security.PrivilegedAction; |
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import java.util.Map; |
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import java.util.WeakHashMap; |
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import java.util.logging.Level; |
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import java.util.logging.Logger; |
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import com.sun.xml.internal.bind.Util; |
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/** |
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* Creates new instances of classes. |
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* |
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* <p> |
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* This code handles the case where the class is not public or the constructor is |
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* not public. |
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* |
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* @since 2.0 |
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* @author Kohsuke Kawaguchi |
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*/ |
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public final class ClassFactory { |
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private static final Class[] emptyClass = new Class[0]; |
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private static final Object[] emptyObject = new Object[0]; |
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private static final Logger logger = Util.getClassLogger(); |
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/** |
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* Cache from a class to its default constructor. |
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* |
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* To avoid synchronization among threads, we use {@link ThreadLocal}. |
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*/ |
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private static final ThreadLocal<Map<Class, WeakReference<Constructor>>> tls = new ThreadLocal<Map<Class,WeakReference<Constructor>>>() { |
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@Override |
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public Map<Class,WeakReference<Constructor>> initialValue() { |
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return new WeakHashMap<Class,WeakReference<Constructor>>(); |
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} |
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}; |
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public static void cleanCache() { |
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if (tls != null) { |
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try { |
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tls.remove(); |
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} catch (Exception e) { |
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logger.log(Level.WARNING, "Unable to clean Thread Local cache of classes used in Unmarshaller: {0}", e.getLocalizedMessage()); |
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} |
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} |
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} |
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/** |
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* Creates a new instance of the class but throw exceptions without catching it. |
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*/ |
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public static <T> T create0( final Class<T> clazz ) throws IllegalAccessException, InvocationTargetException, InstantiationException { |
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Map<Class,WeakReference<Constructor>> m = tls.get(); |
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Constructor<T> cons = null; |
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WeakReference<Constructor> consRef = m.get(clazz); |
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if(consRef!=null) |
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cons = consRef.get(); |
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if(cons==null) { |
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if (System.getSecurityManager() == null) { |
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cons = tryGetDeclaredConstructor(clazz); |
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} else { |
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cons = AccessController.doPrivileged(new PrivilegedAction<Constructor<T>>() { |
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@Override |
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public Constructor<T> run() { |
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return tryGetDeclaredConstructor(clazz); |
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} |
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}); |
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} |
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int classMod = clazz.getModifiers(); |
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if(!Modifier.isPublic(classMod) || !Modifier.isPublic(cons.getModifiers())) { |
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// attempt to make it work even if the constructor is not accessible |
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try { |
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cons.setAccessible(true); |
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} catch(SecurityException e) { |
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// but if we don't have a permission to do so, work gracefully. |
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logger.log(Level.FINE,"Unable to make the constructor of "+clazz+" accessible",e); |
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throw e; |
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} |
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} |
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m.put(clazz,new WeakReference<Constructor>(cons)); |
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} |
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return cons.newInstance(emptyObject); |
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} |
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private static <T> Constructor<T> tryGetDeclaredConstructor(Class<T> clazz) { |
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try { |
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return clazz.getDeclaredConstructor((Class<T>[])emptyClass); |
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} catch (NoSuchMethodException e) { |
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logger.log(Level.INFO,"No default constructor found on "+clazz,e); |
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NoSuchMethodError exp; |
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if(clazz.getDeclaringClass()!=null && !Modifier.isStatic(clazz.getModifiers())) { |
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exp = new NoSuchMethodError(Messages.NO_DEFAULT_CONSTRUCTOR_IN_INNER_CLASS |
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.format(clazz.getName())); |
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} else { |
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exp = new NoSuchMethodError(e.getMessage()); |
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} |
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exp.initCause(e); |
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throw exp; |
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} |
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} |
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/** |
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* The same as {@link #create0} but with an error handling to make |
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* the instantiation error fatal. |
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*/ |
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public static <T> T create( Class<T> clazz ) { |
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try { |
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return create0(clazz); |
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} catch (InstantiationException e) { |
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logger.log(Level.INFO,"failed to create a new instance of "+clazz,e); |
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throw new InstantiationError(e.toString()); |
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} catch (IllegalAccessException e) { |
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logger.log(Level.INFO,"failed to create a new instance of "+clazz,e); |
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throw new IllegalAccessError(e.toString()); |
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} catch (InvocationTargetException e) { |
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Throwable target = e.getTargetException(); |
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// most likely an error on the user's code. |
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// just let it through for the ease of debugging |
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if(target instanceof RuntimeException) |
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throw (RuntimeException)target; |
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// error. just forward it for the ease of debugging |
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if(target instanceof Error) |
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throw (Error)target; |
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// a checked exception. |
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// not sure how we should report this error, |
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// but for now we just forward it by wrapping it into a runtime exception |
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throw new IllegalStateException(target); |
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} |
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} |
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/** |
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* Call a method in the factory class to get the object. |
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*/ |
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public static Object create(Method method) { |
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Throwable errorMsg; |
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try { |
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return method.invoke(null, emptyObject); |
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} catch (InvocationTargetException ive) { |
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Throwable target = ive.getTargetException(); |
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if(target instanceof RuntimeException) |
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throw (RuntimeException)target; |
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if(target instanceof Error) |
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throw (Error)target; |
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throw new IllegalStateException(target); |
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} catch (IllegalAccessException e) { |
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logger.log(Level.INFO,"failed to create a new instance of "+method.getReturnType().getName(),e); |
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throw new IllegalAccessError(e.toString()); |
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} catch (IllegalArgumentException iae){ |
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logger.log(Level.INFO,"failed to create a new instance of "+method.getReturnType().getName(),iae); |
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errorMsg = iae; |
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} catch (NullPointerException npe){ |
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logger.log(Level.INFO,"failed to create a new instance of "+method.getReturnType().getName(),npe); |
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errorMsg = npe; |
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} catch (ExceptionInInitializerError eie){ |
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logger.log(Level.INFO,"failed to create a new instance of "+method.getReturnType().getName(),eie); |
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errorMsg = eie; |
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} |
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NoSuchMethodError exp; |
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exp = new NoSuchMethodError(errorMsg.getMessage()); |
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exp.initCause(errorMsg); |
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throw exp; |
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} |
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/** |
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* Infers the instanciable implementation class that can be assigned to the given field type. |
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* |
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* @return null |
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* if inference fails. |
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*/ |
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public static <T> Class<? extends T> inferImplClass(Class<T> fieldType, Class[] knownImplClasses) { |
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if(!fieldType.isInterface()) |
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return fieldType; |
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for( Class<?> impl : knownImplClasses ) { |
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if(fieldType.isAssignableFrom(impl)) |
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return impl.asSubclass(fieldType); |
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} |
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// if we can't find an implementation class, |
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// let's just hope that we will never need to create a new object, |
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// and returns null |
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return null; |
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} |
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} |