1 /*
   2  * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package com.sun.xml.internal.bind.v2.runtime.reflect.opt;
  27 
  28 import java.lang.reflect.Field;
  29 import java.lang.reflect.Modifier;
  30 import java.lang.reflect.Type;
  31 import java.util.HashMap;
  32 import java.util.Map;
  33 import java.util.logging.Level;
  34 import java.util.logging.Logger;
  35 
  36 import com.sun.xml.internal.bind.Util;
  37 import com.sun.xml.internal.bind.v2.model.core.TypeInfo;
  38 import com.sun.xml.internal.bind.v2.model.runtime.RuntimeClassInfo;
  39 import com.sun.xml.internal.bind.v2.model.runtime.RuntimePropertyInfo;
  40 import com.sun.xml.internal.bind.v2.runtime.reflect.Accessor;
  41 import com.sun.xml.internal.bind.v2.runtime.reflect.TransducedAccessor;
  42 
  43 import static com.sun.xml.internal.bind.v2.bytecode.ClassTailor.toVMClassName;
  44 
  45 /**
  46  * Prepares optimized {@link TransducedAccessor} from templates.
  47  *
  48  * @author Kohsuke Kawaguchi
  49  */
  50 public abstract class OptimizedTransducedAccessorFactory {
  51     private OptimizedTransducedAccessorFactory() {} // no instanciation please
  52 
  53     // http://java.sun.com/docs/books/vmspec/2nd-edition/html/ConstantPool.doc.html#75929
  54     // "same runtime package"
  55 
  56     private static final Logger logger = Util.getClassLogger();
  57 
  58     private static final String fieldTemplateName;
  59     private static final String methodTemplateName;
  60 
  61     static {
  62         String s = TransducedAccessor_field_Byte.class.getName();
  63         fieldTemplateName = s.substring(0,s.length()-"Byte".length()).replace('.','/');
  64 
  65         s = TransducedAccessor_method_Byte.class.getName();
  66         methodTemplateName = s.substring(0,s.length()-"Byte".length()).replace('.','/');
  67     }
  68 
  69     /**
  70      * Gets the optimized {@link TransducedAccessor} if possible.
  71      *
  72      * @return null
  73      *      if for some reason it fails to create an optimized version.
  74      */
  75     public static final TransducedAccessor get(RuntimePropertyInfo prop) {
  76         Accessor acc = prop.getAccessor();
  77 
  78         // consider using an optimized TransducedAccessor implementations.
  79         Class opt=null;
  80 
  81         TypeInfo<Type,Class> parent = prop.parent();
  82         if(!(parent instanceof RuntimeClassInfo))
  83             return null;
  84 
  85         Class dc = ((RuntimeClassInfo)parent).getClazz();
  86         String newClassName = toVMClassName(dc)+"_JaxbXducedAccessor_"+prop.getName();
  87 
  88 
  89         if(acc instanceof Accessor.FieldReflection) {
  90             // TODO: we also need to make sure that the default xducer is used.
  91             Accessor.FieldReflection racc = (Accessor.FieldReflection) acc;
  92             Field field = racc.f;
  93 
  94             int mods = field.getModifiers();
  95             if(Modifier.isPrivate(mods) || Modifier.isFinal(mods))
  96                 // we can't access private fields.
  97                 // TODO: think about how to improve this case
  98                 return null;
  99 
 100             Class<?> t = field.getType();
 101             if(t.isPrimitive())
 102                 opt = AccessorInjector.prepare( dc,
 103                     fieldTemplateName+suffixMap.get(t),
 104                     newClassName,
 105                     toVMClassName(Bean.class),
 106                     toVMClassName(dc),
 107                     "f_"+t.getName(),
 108                     field.getName() );
 109         }
 110 
 111         if(acc.getClass()==Accessor.GetterSetterReflection.class) {
 112             Accessor.GetterSetterReflection gacc = (Accessor.GetterSetterReflection) acc;
 113 
 114             if(gacc.getter==null || gacc.setter==null)
 115                 return null;    // incomplete
 116 
 117             Class<?> t = gacc.getter.getReturnType();
 118 
 119             if(Modifier.isPrivate(gacc.getter.getModifiers())
 120             || Modifier.isPrivate(gacc.setter.getModifiers()))
 121                 // we can't access private methods.
 122                 return null;
 123 
 124 
 125             if(t.isPrimitive())
 126                 opt = AccessorInjector.prepare( dc,
 127                     methodTemplateName+suffixMap.get(t),
 128                     newClassName,
 129                     toVMClassName(Bean.class),
 130                     toVMClassName(dc),
 131                     "get_"+t.getName(),
 132                     gacc.getter.getName(),
 133                     "set_"+t.getName(),
 134                     gacc.setter.getName());
 135         }
 136 
 137         if(opt==null)
 138             return null;
 139 
 140         logger.log(Level.FINE,"Using optimized TransducedAccessor for "+prop.displayName());
 141 
 142 
 143         try {
 144             return (TransducedAccessor)opt.newInstance();
 145         } catch (InstantiationException e) {
 146             logger.log(Level.INFO,"failed to load an optimized TransducedAccessor",e);
 147         } catch (IllegalAccessException e) {
 148             logger.log(Level.INFO,"failed to load an optimized TransducedAccessor",e);
 149         } catch (SecurityException e) {
 150             logger.log(Level.INFO,"failed to load an optimized TransducedAccessor",e);
 151         }
 152         return null;
 153     }
 154 
 155     private static final Map<Class,String> suffixMap = new HashMap<Class, String>();
 156 
 157     static {
 158         suffixMap.put(Byte.TYPE,"Byte");
 159         suffixMap.put(Short.TYPE,"Short");
 160         suffixMap.put(Integer.TYPE,"Integer");
 161         suffixMap.put(Long.TYPE,"Long");
 162         suffixMap.put(Boolean.TYPE,"Boolean");
 163         suffixMap.put(Float.TYPE,"Float");
 164         suffixMap.put(Double.TYPE,"Double");
 165     }
 166 
 167 }