1 /*
2 * Copyright (c) 2001, 2011, 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 jdk.internal.reflect;
27
28 import java.lang.reflect.Field;
29 import java.lang.reflect.Modifier;
30 import java.util.Objects;
31
32 import jdk.internal.misc.Unsafe;
33
34 /** Base class for jdk.internal.misc.Unsafe-based FieldAccessors. The
35 observation is that there are only nine types of fields from the
36 standpoint of reflection code: the eight primitive types and
37 Object. Using class Unsafe instead of generated bytecodes saves
38 memory and loading time for the dynamically-generated
39 FieldAccessors. */
40
41 abstract class UnsafeFieldAccessorImpl extends FieldAccessorImpl {
42 static final Unsafe unsafe = Unsafe.getUnsafe();
43 private static final int FLATTENABLE = 0x01;
44 private static final int FLATTENED = 0x10;
45 private static final int NULLABLE = 0x100;
46
47 protected final Field field;
48 protected final long fieldOffset;
49 protected final boolean isFinal;
50 protected final int flags;
51
52 UnsafeFieldAccessorImpl(Field field) {
53 this.field = field;
54 if (Modifier.isStatic(field.getModifiers()))
55 this.fieldOffset = unsafe.staticFieldOffset(field);
56 else
57 this.fieldOffset = unsafe.objectFieldOffset(field);
58 this.isFinal = Modifier.isFinal(field.getModifiers());
59
60 int flags = 0;
61 if (ReflectionFactory.langReflectAccess().isFlattenable(field))
62 flags |= FLATTENABLE;
63 if (ReflectionFactory.langReflectAccess().isFlattened(field))
64 flags |= FLATTENED;
65 if (ReflectionFactory.langReflectAccess().isNullable(field))
66 flags |= NULLABLE;
67 this.flags = flags;
68 }
69
70 protected void ensureObj(Object o) {
71 // NOTE: will throw NullPointerException, as specified, if o is null
72 if (!field.getDeclaringClass().isAssignableFrom(o.getClass())) {
73 throwSetIllegalArgumentException(o);
74 }
75 }
76
77 protected boolean isFlattenable() {
78 return (flags & FLATTENABLE) == FLATTENABLE;
79 }
80
81 protected boolean isFlattened() {
82 return (flags & FLATTENED) == FLATTENED;
83 }
84
85 protected boolean isNullable() {
86 return (flags & NULLABLE) == NULLABLE;
87 }
88
89 protected Object checkValue(Object value) {
90 if (!isNullable() && value == null)
91 throw new NullPointerException(field + " cannot be set to null");
92
93 if (value != null) {
94 if (!field.getType().isAssignableFrom(value.getClass())) {
95 throwSetIllegalArgumentException(value);
96 }
97 }
98 return value;
99 }
100
101 private String getQualifiedFieldName() {
102 return field.getDeclaringClass().getName() + "." +field.getName();
103 }
104
105 protected IllegalArgumentException newGetIllegalArgumentException(String type) {
106 return new IllegalArgumentException(
107 "Attempt to get "+field.getType().getName()+" field \"" +
108 getQualifiedFieldName() + "\" with illegal data type conversion to "+type
109 );
110 }
111
112 protected void throwFinalFieldIllegalAccessException(String attemptedType,
113 String attemptedValue)
114 throws IllegalAccessException {
115 throw new IllegalAccessException(getSetMessage(attemptedType, attemptedValue));
116
117 }
118 protected void throwFinalFieldIllegalAccessException(Object o) throws IllegalAccessException {
119 throwFinalFieldIllegalAccessException(o != null ? o.getClass().getName() : "", "");
120 }
121
122 protected void throwFinalFieldIllegalAccessException(boolean z) throws IllegalAccessException {
123 throwFinalFieldIllegalAccessException("boolean", Boolean.toString(z));
124 }
125
126 protected void throwFinalFieldIllegalAccessException(char b) throws IllegalAccessException {
127 throwFinalFieldIllegalAccessException("char", Character.toString(b));
128 }
129
130 protected void throwFinalFieldIllegalAccessException(byte b) throws IllegalAccessException {
131 throwFinalFieldIllegalAccessException("byte", Byte.toString(b));
132 }
133
134 protected void throwFinalFieldIllegalAccessException(short b) throws IllegalAccessException {
135 throwFinalFieldIllegalAccessException("short", Short.toString(b));
136 }
137
138 protected void throwFinalFieldIllegalAccessException(int i) throws IllegalAccessException {
139 throwFinalFieldIllegalAccessException("int", Integer.toString(i));
140 }
141
142 protected void throwFinalFieldIllegalAccessException(long i) throws IllegalAccessException {
143 throwFinalFieldIllegalAccessException("long", Long.toString(i));
144 }
145
146 protected void throwFinalFieldIllegalAccessException(float f) throws IllegalAccessException {
147 throwFinalFieldIllegalAccessException("float", Float.toString(f));
148 }
149
150 protected void throwFinalFieldIllegalAccessException(double f) throws IllegalAccessException {
151 throwFinalFieldIllegalAccessException("double", Double.toString(f));
152 }
153
154 protected IllegalArgumentException newGetBooleanIllegalArgumentException() {
155 return newGetIllegalArgumentException("boolean");
156 }
157
158 protected IllegalArgumentException newGetByteIllegalArgumentException() {
159 return newGetIllegalArgumentException("byte");
160 }
161
162 protected IllegalArgumentException newGetCharIllegalArgumentException() {
163 return newGetIllegalArgumentException("char");
164 }
165
166 protected IllegalArgumentException newGetShortIllegalArgumentException() {
167 return newGetIllegalArgumentException("short");
168 }
169
170 protected IllegalArgumentException newGetIntIllegalArgumentException() {
171 return newGetIllegalArgumentException("int");
172 }
173
174 protected IllegalArgumentException newGetLongIllegalArgumentException() {
175 return newGetIllegalArgumentException("long");
176 }
177
178 protected IllegalArgumentException newGetFloatIllegalArgumentException() {
179 return newGetIllegalArgumentException("float");
180 }
181
182 protected IllegalArgumentException newGetDoubleIllegalArgumentException() {
183 return newGetIllegalArgumentException("double");
184 }
185
186 protected String getSetMessage(String attemptedType, String attemptedValue) {
187 String err = "Can not set";
188 if (Modifier.isStatic(field.getModifiers()))
189 err += " static";
190 if (isFinal)
191 err += " final";
192 err += " " + field.getType().getName() + " field " + getQualifiedFieldName() + " to ";
193 if (attemptedValue.length() > 0) {
194 err += "(" + attemptedType + ")" + attemptedValue;
195 } else {
196 if (attemptedType.length() > 0)
197 err += attemptedType;
198 else
199 err += "null value";
200 }
201 return err;
202 }
203
204 protected void throwSetIllegalArgumentException(String attemptedType,
205 String attemptedValue) {
206 throw new IllegalArgumentException(getSetMessage(attemptedType,attemptedValue));
207 }
208
209 protected void throwSetIllegalArgumentException(Object o) {
210 throwSetIllegalArgumentException(o != null ? o.getClass().getName() : "", "");
211 }
212
213 protected void throwSetIllegalArgumentException(boolean b) {
214 throwSetIllegalArgumentException("boolean", Boolean.toString(b));
215 }
216
217 protected void throwSetIllegalArgumentException(byte b) {
218 throwSetIllegalArgumentException("byte", Byte.toString(b));
219 }
220
221 protected void throwSetIllegalArgumentException(char c) {
222 throwSetIllegalArgumentException("char", Character.toString(c));
223 }
224
225 protected void throwSetIllegalArgumentException(short s) {
226 throwSetIllegalArgumentException("short", Short.toString(s));
227 }
228
229 protected void throwSetIllegalArgumentException(int i) {
230 throwSetIllegalArgumentException("int", Integer.toString(i));
231 }
232
233 protected void throwSetIllegalArgumentException(long l) {
234 throwSetIllegalArgumentException("long", Long.toString(l));
235 }
236
237 protected void throwSetIllegalArgumentException(float f) {
238 throwSetIllegalArgumentException("float", Float.toString(f));
239 }
240
241 protected void throwSetIllegalArgumentException(double d) {
242 throwSetIllegalArgumentException("double", Double.toString(d));
243 }
244
245 }