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 protected final boolean isFlattened;
46
47 UnsafeFieldAccessorImpl(Field field) {
48 this.field = field;
49 if (Modifier.isStatic(field.getModifiers()))
50 fieldOffset = unsafe.staticFieldOffset(field);
51 else
52 fieldOffset = unsafe.objectFieldOffset(field);
53 isFinal = Modifier.isFinal(field.getModifiers());
54 isFlattened = ReflectionFactory.langReflectAccess().isFlattened(field);
55 }
56
57 protected void ensureObj(Object o) {
58 // NOTE: will throw NullPointerException, as specified, if o is null
59 if (!field.getDeclaringClass().isAssignableFrom(o.getClass())) {
60 throwSetIllegalArgumentException(o);
61 }
62 }
63
64 private String getQualifiedFieldName() {
65 return field.getDeclaringClass().getName() + "." +field.getName();
66 }
67
68 protected IllegalArgumentException newGetIllegalArgumentException(String type) {
69 return new IllegalArgumentException(
70 "Attempt to get "+field.getType().getName()+" field \"" +
71 getQualifiedFieldName() + "\" with illegal data type conversion to "+type
72 );
73 }
74
75 protected void throwFinalFieldIllegalAccessException(String attemptedType,
76 String attemptedValue)
77 throws IllegalAccessException {
78 throw new IllegalAccessException(getSetMessage(attemptedType, attemptedValue));
79
80 }
81 protected void throwFinalFieldIllegalAccessException(Object o) throws IllegalAccessException {
82 throwFinalFieldIllegalAccessException(o != null ? o.getClass().getName() : "", "");
83 }
|
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 }
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