1 /*

     2  * Copyright 2001-2005 Sun Microsystems, Inc.  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.  Sun designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    22  * CA 95054 USA or visit www.sun.com if you need additional information or

    23  * have any questions.

    24  */

    25 

    26 package sun.reflect;

    27 

    28 import java.lang.reflect.Field;

    29 import java.lang.reflect.Modifier;

    30 import sun.misc.Unsafe;

    31 

    32 /** Base class for sun.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 int     fieldOffset;

    44     protected final boolean isFinal;

    45 

    46     UnsafeFieldAccessorImpl(Field field) {

    47         this.field = field;

    48         fieldOffset = unsafe.fieldOffset(field);

    49         isFinal = Modifier.isFinal(field.getModifiers());

    50     }

    51 

    52     protected void ensureObj(Object o) {

    53         // NOTE: will throw NullPointerException, as specified, if o is null

    54         if (!field.getDeclaringClass().isAssignableFrom(o.getClass())) {

    55             throwSetIllegalArgumentException(o);

    56         }

    57     }

    58 

    59     private String getQualifiedFieldName() {

    60       return field.getDeclaringClass().getName() + "." +field.getName();

    61     }

    62 

    63     protected IllegalArgumentException newGetIllegalArgumentException(String type) {

    64         return new IllegalArgumentException(

    65           "Attempt to get "+field.getType().getName()+" field \"" +

    66           getQualifiedFieldName() + "\" with illegal data type conversion to "+type

    67         );

    68     }

    69 

    70     protected void throwFinalFieldIllegalAccessException(String attemptedType,

    71                                                          String attemptedValue)

    72                                                          throws IllegalAccessException {

    73         throw new IllegalAccessException(getSetMessage(attemptedType, attemptedValue));

    74 

    75     }

    76     protected void throwFinalFieldIllegalAccessException(Object o) throws IllegalAccessException {

    77         throwFinalFieldIllegalAccessException(o != null ? o.getClass().getName() : "", "");

    78     }

    79 

    80     protected void throwFinalFieldIllegalAccessException(boolean z) throws IllegalAccessException {

    81         throwFinalFieldIllegalAccessException("boolean", Boolean.toString(z));

    82     }

    83 

    84     protected void throwFinalFieldIllegalAccessException(char b) throws IllegalAccessException {

    85         throwFinalFieldIllegalAccessException("char", Character.toString(b));

    86     }

    87 

    88     protected void throwFinalFieldIllegalAccessException(byte b) throws IllegalAccessException {

    89         throwFinalFieldIllegalAccessException("byte", Byte.toString(b));

    90     }

    91 

    92     protected void throwFinalFieldIllegalAccessException(short b) throws IllegalAccessException {

    93         throwFinalFieldIllegalAccessException("short", Short.toString(b));

    94     }

    95 

    96     protected void throwFinalFieldIllegalAccessException(int i) throws IllegalAccessException {

    97         throwFinalFieldIllegalAccessException("int", Integer.toString(i));

    98     }

    99 

   100     protected void throwFinalFieldIllegalAccessException(long i) throws IllegalAccessException {

   101         throwFinalFieldIllegalAccessException("long", Long.toString(i));

   102     }

   103 

   104     protected void throwFinalFieldIllegalAccessException(float f) throws IllegalAccessException {

   105         throwFinalFieldIllegalAccessException("float", Float.toString(f));

   106     }

   107 

   108     protected void throwFinalFieldIllegalAccessException(double f) throws IllegalAccessException {

   109         throwFinalFieldIllegalAccessException("double", Double.toString(f));

   110     }

   111 

   112     protected IllegalArgumentException newGetBooleanIllegalArgumentException() {

   113         return newGetIllegalArgumentException("boolean");

   114     }

   115 

   116     protected IllegalArgumentException newGetByteIllegalArgumentException() {

   117         return newGetIllegalArgumentException("byte");

   118     }

   119 

   120     protected IllegalArgumentException newGetCharIllegalArgumentException() {

   121         return newGetIllegalArgumentException("char");

   122     }

   123 

   124     protected IllegalArgumentException newGetShortIllegalArgumentException() {

   125         return newGetIllegalArgumentException("short");

   126     }

   127 

   128     protected IllegalArgumentException newGetIntIllegalArgumentException() {

   129         return newGetIllegalArgumentException("int");

   130     }

   131 

   132     protected IllegalArgumentException newGetLongIllegalArgumentException() {

   133         return newGetIllegalArgumentException("long");

   134     }

   135 

   136     protected IllegalArgumentException newGetFloatIllegalArgumentException() {

   137         return newGetIllegalArgumentException("float");

   138     }

   139 

   140     protected IllegalArgumentException newGetDoubleIllegalArgumentException() {

   141         return newGetIllegalArgumentException("double");

   142     }

   143 

   144     protected String getSetMessage(String attemptedType, String attemptedValue) {

   145         String err = "Can not set";

   146         if (Modifier.isStatic(field.getModifiers()))

   147             err += " static";

   148         if (isFinal)

   149             err += " final";

   150         err += " " + field.getType().getName() + " field " + getQualifiedFieldName() + " to ";

   151         if (attemptedValue.length() > 0) {

   152             err += "(" + attemptedType + ")" + attemptedValue;

   153         } else {

   154             if (attemptedType.length() > 0)

   155                 err += attemptedType;

   156             else

   157                 err += "null value";

   158         }

   159         return err;

   160     }

   161 

   162     protected void throwSetIllegalArgumentException(String attemptedType,

   163                                                     String attemptedValue) {

   164         throw new IllegalArgumentException(getSetMessage(attemptedType,attemptedValue));

   165     }

   166 

   167     protected void throwSetIllegalArgumentException(Object o) {

   168         throwSetIllegalArgumentException(o != null ? o.getClass().getName() : "", "");

   169     }

   170 

   171     protected void throwSetIllegalArgumentException(boolean b) {

   172         throwSetIllegalArgumentException("boolean", Boolean.toString(b));

   173     }

   174 

   175     protected void throwSetIllegalArgumentException(byte b) {

   176         throwSetIllegalArgumentException("byte", Byte.toString(b));

   177     }

   178 

   179     protected void throwSetIllegalArgumentException(char c) {

   180         throwSetIllegalArgumentException("char", Character.toString(c));

   181     }

   182 

   183     protected void throwSetIllegalArgumentException(short s) {

   184         throwSetIllegalArgumentException("short", Short.toString(s));

   185     }

   186 

   187     protected void throwSetIllegalArgumentException(int i) {

   188         throwSetIllegalArgumentException("int", Integer.toString(i));

   189     }

   190 

   191     protected void throwSetIllegalArgumentException(long l) {

   192         throwSetIllegalArgumentException("long", Long.toString(l));

   193     }

   194 

   195     protected void throwSetIllegalArgumentException(float f) {

   196         throwSetIllegalArgumentException("float", Float.toString(f));

   197     }

   198 

   199     protected void throwSetIllegalArgumentException(double d) {

   200         throwSetIllegalArgumentException("double", Double.toString(d));

   201     }

   202 

   203 }