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
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23 * questions.
24 */
25
26package com.sun.xml.internal.bind.v2.runtime.reflect.opt;
27
28import java.lang.reflect.Field;
29import java.lang.reflect.Modifier;
30import java.lang.reflect.Type;
31import java.util.HashMap;
32import java.util.Map;
33import java.util.logging.Level;
34import java.util.logging.Logger;
35
36import com.sun.xml.internal.bind.Util;
37import com.sun.xml.internal.bind.v2.model.core.TypeInfo;
38import com.sun.xml.internal.bind.v2.model.runtime.RuntimeClassInfo;
39import com.sun.xml.internal.bind.v2.model.runtime.RuntimePropertyInfo;
40import com.sun.xml.internal.bind.v2.runtime.reflect.Accessor;
41import com.sun.xml.internal.bind.v2.runtime.reflect.TransducedAccessor;
42
43import 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 */
50public 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}
168