1/*
2 * Copyright (c) 1997, 2013, 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.Method;
30import java.lang.reflect.Modifier;
31import java.util.logging.Level;
32import java.util.logging.Logger;
33
34import com.sun.xml.internal.bind.Util;
35import com.sun.xml.internal.bind.v2.runtime.reflect.Accessor;
36import com.sun.xml.internal.bind.v2.runtime.RuntimeUtil;
37
38import static com.sun.xml.internal.bind.v2.bytecode.ClassTailor.toVMClassName;
39import static com.sun.xml.internal.bind.v2.bytecode.ClassTailor.toVMTypeName;
40
41/**
42 * @author Kohsuke Kawaguchi
43 */
44public abstract class OptimizedAccessorFactory {
45    private OptimizedAccessorFactory() {} // no instanciation please
46
47    private static final Logger logger = Util.getClassLogger();
48
49
50    private static final String fieldTemplateName;
51    private static final String methodTemplateName;
52
53    static {
54        String s = FieldAccessor_Byte.class.getName();
55        fieldTemplateName = s.substring(0,s.length()-"Byte".length()).replace('.','/');
56
57        s = MethodAccessor_Byte.class.getName();
58        methodTemplateName = s.substring(0,s.length()-"Byte".length()).replace('.','/');
59    }
60
61    /**
62     * Gets the optimized {@link Accessor} that accesses the given getter/setter.
63     *
64     * @return null
65     *      if for some reason it fails to create an optimized version.
66     */
67    public static final <B,V> Accessor<B,V> get(Method getter, Method setter) {
68        // make sure the method signatures are what we expect
69        if(getter.getParameterTypes().length!=0)
70            return null;
71        Class<?>[] sparams = setter.getParameterTypes();
72        if(sparams.length!=1)
73            return null;
74        if(sparams[0]!=getter.getReturnType())
75            return null;
76        if(setter.getReturnType()!=Void.TYPE)
77            return null;
78        if(getter.getDeclaringClass()!=setter.getDeclaringClass())
79            return null;
80        if(Modifier.isPrivate(getter.getModifiers()) || Modifier.isPrivate(setter.getModifiers()))
81            // we can't access private fields
82            return null;
83
84        Class t = sparams[0];
85        String typeName = t.getName().replace('.','_');
86        if (t.isArray()) {
87            typeName = "AOf_";
88            String compName = t.getComponentType().getName().replace('.','_');
89            while (compName.startsWith("[L")) {
90                compName = compName.substring(2);
91                typeName += "AOf_";
92            }
93            typeName = typeName + compName;
94        }
95
96        String newClassName = toVMClassName(getter.getDeclaringClass())+"$JaxbAccessorM_"+getter.getName()+'_'+setter.getName()+'_'+typeName;
97        Class opt;
98
99        if(t.isPrimitive())
100            opt = AccessorInjector.prepare( getter.getDeclaringClass(),
101                methodTemplateName+RuntimeUtil.primitiveToBox.get(t).getSimpleName(),
102                newClassName,
103                toVMClassName(Bean.class),
104                toVMClassName(getter.getDeclaringClass()),
105                "get_"+t.getName(),
106                getter.getName(),
107                "set_"+t.getName(),
108                setter.getName());
109        else
110            opt = AccessorInjector.prepare( getter.getDeclaringClass(),
111                methodTemplateName+"Ref",
112                newClassName,
113                toVMClassName(Bean.class),
114                toVMClassName(getter.getDeclaringClass()),
115                toVMClassName(Ref.class),
116                toVMClassName(t),
117                "()"+toVMTypeName(Ref.class),
118                "()"+toVMTypeName(t),
119                '('+toVMTypeName(Ref.class)+")V",
120                '('+toVMTypeName(t)+")V",
121                "get_ref",
122                getter.getName(),
123                "set_ref",
124                setter.getName());
125
126        if(opt==null)
127            return null;
128
129        Accessor<B,V> acc = instanciate(opt);
130        if (acc!=null) {
131            if (logger.isLoggable(Level.FINE)) {
132                logger.log(Level.FINE, "Using optimized Accessor for {0} and {1}", new Object[]{getter, setter});
133            }
134        }
135        return acc;
136    }
137
138
139    /**
140     * Gets the optimized {@link Accessor} that accesses the given field.
141     *
142     * @return null
143     *      if for some reason it fails to create an optimized version.
144     */
145    public static final <B,V> Accessor<B,V> get(Field field) {
146        int mods = field.getModifiers();
147        if(Modifier.isPrivate(mods) || Modifier.isFinal(mods))
148            // we can't access private fields
149            return null;
150
151        String newClassName = toVMClassName(field.getDeclaringClass())+"$JaxbAccessorF_"+field.getName();
152
153        Class opt;
154
155        if(field.getType().isPrimitive())
156            opt = AccessorInjector.prepare( field.getDeclaringClass(),
157                fieldTemplateName+RuntimeUtil.primitiveToBox.get(field.getType()).getSimpleName(),
158                newClassName,
159                toVMClassName(Bean.class),
160                toVMClassName(field.getDeclaringClass()),
161                "f_"+field.getType().getName(),
162                field.getName() );
163        else
164            opt = AccessorInjector.prepare( field.getDeclaringClass(),
165                fieldTemplateName+"Ref",
166                newClassName,
167                toVMClassName(Bean.class),
168                toVMClassName(field.getDeclaringClass()),
169                toVMClassName(Ref.class),
170                toVMClassName(field.getType()),
171                toVMTypeName(Ref.class),
172                toVMTypeName(field.getType()),
173                "f_ref",
174                field.getName() );
175
176        if(opt==null)
177            return null;
178
179        Accessor<B,V> acc = instanciate(opt);
180        if (acc!=null) {
181            if (logger.isLoggable(Level.FINE)) {
182                logger.log(Level.FINE, "Using optimized Accessor for {0}", field);
183            }
184        }
185        return acc;
186    }
187
188    private static <B,V> Accessor<B,V> instanciate(Class opt) {
189        try {
190            return (Accessor<B,V>)opt.newInstance();
191        } catch (InstantiationException e) {
192            logger.log(Level.INFO,"failed to load an optimized Accessor",e);
193        } catch (IllegalAccessException e) {
194            logger.log(Level.INFO,"failed to load an optimized Accessor",e);
195        } catch (SecurityException e) {
196            logger.log(Level.INFO,"failed to load an optimized Accessor",e);
197        }
198        return null;
199    }
200}
201