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