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