1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/jaxws_classes/com/sun/xml/internal/bind/v2/ClassFactory.java Wed Apr 27 01:27:09 2016 +0800
1.3 @@ -0,0 +1,210 @@
1.4 +/*
1.5 + * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation. Oracle designates this
1.11 + * particular file as subject to the "Classpath" exception as provided
1.12 + * by Oracle in the LICENSE file that accompanied this code.
1.13 + *
1.14 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.15 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.16 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.17 + * version 2 for more details (a copy is included in the LICENSE file that
1.18 + * accompanied this code).
1.19 + *
1.20 + * You should have received a copy of the GNU General Public License version
1.21 + * 2 along with this work; if not, write to the Free Software Foundation,
1.22 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.23 + *
1.24 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.25 + * or visit www.oracle.com if you need additional information or have any
1.26 + * questions.
1.27 + */
1.28 +
1.29 +package com.sun.xml.internal.bind.v2;
1.30 +
1.31 +import java.lang.reflect.Constructor;
1.32 +import java.lang.reflect.InvocationTargetException;
1.33 +import java.lang.reflect.Method;
1.34 +import java.lang.reflect.Modifier;
1.35 +import java.lang.ref.WeakReference;
1.36 +import java.util.Map;
1.37 +import java.util.WeakHashMap;
1.38 +import java.util.logging.Level;
1.39 +import java.util.logging.Logger;
1.40 +
1.41 +import com.sun.xml.internal.bind.Util;
1.42 +
1.43 +/**
1.44 + * Creates new instances of classes.
1.45 + *
1.46 + * <p>
1.47 + * This code handles the case where the class is not public or the constructor is
1.48 + * not public.
1.49 + *
1.50 + * @since 2.0
1.51 + * @author Kohsuke Kawaguchi
1.52 + */
1.53 +public final class ClassFactory {
1.54 + private static final Class[] emptyClass = new Class[0];
1.55 + private static final Object[] emptyObject = new Object[0];
1.56 +
1.57 + private static final Logger logger = Util.getClassLogger();
1.58 +
1.59 + /**
1.60 + * Cache from a class to its default constructor.
1.61 + *
1.62 + * To avoid synchronization among threads, we use {@link ThreadLocal}.
1.63 + */
1.64 + private static final ThreadLocal<Map<Class, WeakReference<Constructor>>> tls = new ThreadLocal<Map<Class,WeakReference<Constructor>>>() {
1.65 + @Override
1.66 + public Map<Class,WeakReference<Constructor>> initialValue() {
1.67 + return new WeakHashMap<Class,WeakReference<Constructor>>();
1.68 + }
1.69 + };
1.70 +
1.71 + public static void cleanCache() {
1.72 + if (tls != null) {
1.73 + try {
1.74 + tls.remove();
1.75 + } catch (Exception e) {
1.76 + logger.log(Level.WARNING, "Unable to clean Thread Local cache of classes used in Unmarshaller: {0}", e.getLocalizedMessage());
1.77 + }
1.78 + }
1.79 + }
1.80 +
1.81 + /**
1.82 + * Creates a new instance of the class but throw exceptions without catching it.
1.83 + */
1.84 + public static <T> T create0( final Class<T> clazz ) throws IllegalAccessException, InvocationTargetException, InstantiationException {
1.85 + Map<Class,WeakReference<Constructor>> m = tls.get();
1.86 + Constructor<T> cons = null;
1.87 + WeakReference<Constructor> consRef = m.get(clazz);
1.88 + if(consRef!=null)
1.89 + cons = consRef.get();
1.90 + if(cons==null) {
1.91 + try {
1.92 + cons = clazz.getDeclaredConstructor(emptyClass);
1.93 + } catch (NoSuchMethodException e) {
1.94 + logger.log(Level.INFO,"No default constructor found on "+clazz,e);
1.95 + NoSuchMethodError exp;
1.96 + if(clazz.getDeclaringClass()!=null && !Modifier.isStatic(clazz.getModifiers())) {
1.97 + exp = new NoSuchMethodError(Messages.NO_DEFAULT_CONSTRUCTOR_IN_INNER_CLASS.format(clazz.getName()));
1.98 + } else {
1.99 + exp = new NoSuchMethodError(e.getMessage());
1.100 + }
1.101 + exp.initCause(e);
1.102 + throw exp;
1.103 + }
1.104 +
1.105 + int classMod = clazz.getModifiers();
1.106 +
1.107 + if(!Modifier.isPublic(classMod) || !Modifier.isPublic(cons.getModifiers())) {
1.108 + // attempt to make it work even if the constructor is not accessible
1.109 + try {
1.110 + cons.setAccessible(true);
1.111 + } catch(SecurityException e) {
1.112 + // but if we don't have a permission to do so, work gracefully.
1.113 + logger.log(Level.FINE,"Unable to make the constructor of "+clazz+" accessible",e);
1.114 + throw e;
1.115 + }
1.116 + }
1.117 +
1.118 + m.put(clazz,new WeakReference<Constructor>(cons));
1.119 + }
1.120 +
1.121 + return cons.newInstance(emptyObject);
1.122 + }
1.123 +
1.124 + /**
1.125 + * The same as {@link #create0} but with an error handling to make
1.126 + * the instantiation error fatal.
1.127 + */
1.128 + public static <T> T create( Class<T> clazz ) {
1.129 + try {
1.130 + return create0(clazz);
1.131 + } catch (InstantiationException e) {
1.132 + logger.log(Level.INFO,"failed to create a new instance of "+clazz,e);
1.133 + throw new InstantiationError(e.toString());
1.134 + } catch (IllegalAccessException e) {
1.135 + logger.log(Level.INFO,"failed to create a new instance of "+clazz,e);
1.136 + throw new IllegalAccessError(e.toString());
1.137 + } catch (InvocationTargetException e) {
1.138 + Throwable target = e.getTargetException();
1.139 +
1.140 + // most likely an error on the user's code.
1.141 + // just let it through for the ease of debugging
1.142 + if(target instanceof RuntimeException)
1.143 + throw (RuntimeException)target;
1.144 +
1.145 + // error. just forward it for the ease of debugging
1.146 + if(target instanceof Error)
1.147 + throw (Error)target;
1.148 +
1.149 + // a checked exception.
1.150 + // not sure how we should report this error,
1.151 + // but for now we just forward it by wrapping it into a runtime exception
1.152 + throw new IllegalStateException(target);
1.153 + }
1.154 + }
1.155 +
1.156 + /**
1.157 + * Call a method in the factory class to get the object.
1.158 + */
1.159 + public static Object create(Method method) {
1.160 + Throwable errorMsg;
1.161 + try {
1.162 + return method.invoke(null, emptyObject);
1.163 + } catch (InvocationTargetException ive) {
1.164 + Throwable target = ive.getTargetException();
1.165 +
1.166 + if(target instanceof RuntimeException)
1.167 + throw (RuntimeException)target;
1.168 +
1.169 + if(target instanceof Error)
1.170 + throw (Error)target;
1.171 +
1.172 + throw new IllegalStateException(target);
1.173 + } catch (IllegalAccessException e) {
1.174 + logger.log(Level.INFO,"failed to create a new instance of "+method.getReturnType().getName(),e);
1.175 + throw new IllegalAccessError(e.toString());
1.176 + } catch (IllegalArgumentException iae){
1.177 + logger.log(Level.INFO,"failed to create a new instance of "+method.getReturnType().getName(),iae);
1.178 + errorMsg = iae;
1.179 + } catch (NullPointerException npe){
1.180 + logger.log(Level.INFO,"failed to create a new instance of "+method.getReturnType().getName(),npe);
1.181 + errorMsg = npe;
1.182 + } catch (ExceptionInInitializerError eie){
1.183 + logger.log(Level.INFO,"failed to create a new instance of "+method.getReturnType().getName(),eie);
1.184 + errorMsg = eie;
1.185 + }
1.186 +
1.187 + NoSuchMethodError exp;
1.188 + exp = new NoSuchMethodError(errorMsg.getMessage());
1.189 + exp.initCause(errorMsg);
1.190 + throw exp;
1.191 + }
1.192 +
1.193 + /**
1.194 + * Infers the instanciable implementation class that can be assigned to the given field type.
1.195 + *
1.196 + * @return null
1.197 + * if inference fails.
1.198 + */
1.199 + public static <T> Class<? extends T> inferImplClass(Class<T> fieldType, Class[] knownImplClasses) {
1.200 + if(!fieldType.isInterface())
1.201 + return fieldType;
1.202 +
1.203 + for( Class<?> impl : knownImplClasses ) {
1.204 + if(fieldType.isAssignableFrom(impl))
1.205 + return impl.asSubclass(fieldType);
1.206 + }
1.207 +
1.208 + // if we can't find an implementation class,
1.209 + // let's just hope that we will never need to create a new object,
1.210 + // and returns null
1.211 + return null;
1.212 + }
1.213 +}
