2
* Copyright (c) 2003, 2009, Oracle and/or its affiliates. All rights reserved.
3
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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.
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).
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.
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
28
import java.io.Serializable;
29
import java.io.IOException;
30
import java.io.InvalidObjectException;
31
import java.io.ObjectInputStream;
32
import java.io.ObjectStreamException;
33
import cli.System.Runtime.Serialization.IObjectReference;
34
import cli.System.Runtime.Serialization.SerializationException;
35
import cli.System.Runtime.Serialization.SerializationInfo;
36
import cli.System.Runtime.Serialization.StreamingContext;
39
* This is the common base class of all Java language enumeration types.
41
* More information about enums, including descriptions of the
42
* implicitly declared methods synthesized by the compiler, can be
43
* found in section 8.9 of
44
* <cite>The Java™ Language Specification</cite>.
46
* <p> Note that when using an enumeration type as the type of a set
47
* or as the type of the keys in a map, specialized and efficient
48
* {@linkplain java.util.EnumSet set} and {@linkplain
49
* java.util.EnumMap map} implementations are available.
51
* @param <E> The enum type subclass
54
* @see Class#getEnumConstants()
55
* @see java.util.EnumSet
56
* @see java.util.EnumMap
59
@cli.System.SerializableAttribute.Annotation
60
public abstract class Enum<E extends Enum<E>>
61
implements Comparable<E>, Serializable {
63
* The name of this enum constant, as declared in the enum declaration.
64
* Most programmers should use the {@link #toString} method rather than
65
* accessing this field.
67
private final String name;
70
* Returns the name of this enum constant, exactly as declared in its
73
* <b>Most programmers should use the {@link #toString} method in
74
* preference to this one, as the toString method may return
75
* a more user-friendly name.</b> This method is designed primarily for
76
* use in specialized situations where correctness depends on getting the
77
* exact name, which will not vary from release to release.
79
* @return the name of this enum constant
81
public final String name() {
86
* The ordinal of this enumeration constant (its position
87
* in the enum declaration, where the initial constant is assigned
88
* an ordinal of zero).
90
* Most programmers will have no use for this field. It is designed
91
* for use by sophisticated enum-based data structures, such as
92
* {@link java.util.EnumSet} and {@link java.util.EnumMap}.
94
private final int ordinal;
97
* Returns the ordinal of this enumeration constant (its position
98
* in its enum declaration, where the initial constant is assigned
99
* an ordinal of zero).
101
* Most programmers will have no use for this method. It is
102
* designed for use by sophisticated enum-based data structures, such
103
* as {@link java.util.EnumSet} and {@link java.util.EnumMap}.
105
* @return the ordinal of this enumeration constant
107
public final int ordinal() {
112
* Sole constructor. Programmers cannot invoke this constructor.
113
* It is for use by code emitted by the compiler in response to
114
* enum type declarations.
116
* @param name - The name of this enum constant, which is the identifier
117
* used to declare it.
118
* @param ordinal - The ordinal of this enumeration constant (its position
119
* in the enum declaration, where the initial constant is assigned
120
* an ordinal of zero).
122
protected Enum(String name, int ordinal) {
124
this.ordinal = ordinal;
128
* Returns the name of this enum constant, as contained in the
129
* declaration. This method may be overridden, though it typically
130
* isn't necessary or desirable. An enum type should override this
131
* method when a more "programmer-friendly" string form exists.
133
* @return the name of this enum constant
135
public String toString() {
140
* Returns true if the specified object is equal to this
143
* @param other the object to be compared for equality with this object.
144
* @return true if the specified object is equal to this
147
public final boolean equals(Object other) {
152
* Returns a hash code for this enum constant.
154
* @return a hash code for this enum constant.
156
public final int hashCode() {
157
return super.hashCode();
161
* Throws CloneNotSupportedException. This guarantees that enums
162
* are never cloned, which is necessary to preserve their "singleton"
165
* @return (never returns)
167
protected final Object clone() throws CloneNotSupportedException {
168
throw new CloneNotSupportedException();
172
* Compares this enum with the specified object for order. Returns a
173
* negative integer, zero, or a positive integer as this object is less
174
* than, equal to, or greater than the specified object.
176
* Enum constants are only comparable to other enum constants of the
177
* same enum type. The natural order implemented by this
178
* method is the order in which the constants are declared.
180
public final int compareTo(E o) {
181
Enum other = (Enum)o;
183
if (self.getClass() != other.getClass() && // optimization
184
self.getDeclaringClass() != other.getDeclaringClass())
185
throw new ClassCastException();
186
return self.ordinal - other.ordinal;
190
* Returns the Class object corresponding to this enum constant's
191
* enum type. Two enum constants e1 and e2 are of the
192
* same enum type if and only if
193
* e1.getDeclaringClass() == e2.getDeclaringClass().
194
* (The value returned by this method may differ from the one returned
195
* by the {@link Object#getClass} method for enum constants with
196
* constant-specific class bodies.)
198
* @return the Class object corresponding to this enum constant's
201
public final Class<E> getDeclaringClass() {
202
Class clazz = getClass();
203
Class zuper = clazz.getSuperclass();
204
return (zuper == Enum.class) ? clazz : zuper;
208
* Returns the enum constant of the specified enum type with the
209
* specified name. The name must match exactly an identifier used
210
* to declare an enum constant in this type. (Extraneous whitespace
211
* characters are not permitted.)
213
* <p>Note that for a particular enum type {@code T}, the
214
* implicitly declared {@code public static T valueOf(String)}
215
* method on that enum may be used instead of this method to map
216
* from a name to the corresponding enum constant. All the
217
* constants of an enum type can be obtained by calling the
218
* implicit {@code public static T[] values()} method of that
221
* @param <T> The enum type whose constant is to be returned
222
* @param enumType the {@code Class} object of the enum type from which
223
* to return a constant
224
* @param name the name of the constant to return
225
* @return the enum constant of the specified enum type with the
227
* @throws IllegalArgumentException if the specified enum type has
228
* no constant with the specified name, or the specified
229
* class object does not represent an enum type
230
* @throws NullPointerException if {@code enumType} or {@code name}
234
public static <T extends Enum<T>> T valueOf(Class<T> enumType,
236
T result = enumType.enumConstantDirectory().get(name);
240
throw new NullPointerException("Name is null");
241
throw new IllegalArgumentException(
242
"No enum constant " + enumType.getCanonicalName() + "." + name);
246
* enum classes cannot have finalize methods.
248
protected final void finalize() { }
251
* prevent default deserialization
253
private void readObject(ObjectInputStream in) throws IOException,
254
ClassNotFoundException {
255
throw new InvalidObjectException("can't deserialize enum");
258
private void readObjectNoData() throws ObjectStreamException {
259
throw new InvalidObjectException("can't deserialize enum");
262
// [IKVM] .NET serialization support starts here
263
// Note that we don't have a security demand, because the info is harmless.
264
@cli.IKVM.Attributes.HideFromJavaAttribute.Annotation
265
@cli.System.Security.SecurityCriticalAttribute.Annotation
266
public final void GetObjectData(SerializationInfo info, StreamingContext context)
268
info.AddValue("enumType", getDeclaringClass());
269
info.AddValue("name", name);
270
info.SetType(ikvm.runtime.Util.getInstanceTypeFromClass(EnumSerializationProxy.class));
274
@cli.System.SerializableAttribute.Annotation
275
final class EnumSerializationProxy implements IObjectReference
277
private Class enumType;
280
@cli.System.Security.SecurityCriticalAttribute.Annotation
281
public Object GetRealObject(StreamingContext context)
285
return Enum.valueOf(enumType, name);
287
catch (IllegalArgumentException x)
289
ikvm.runtime.Util.throwException(new SerializationException("Enum value " + name + " not found in " + enumType, x));