--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.base/share/classes/java/lang/Enum.java Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,260 @@
+/*
+ * Copyright (c) 2003, 2017, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation. Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package java.lang;
+
+import java.io.Serializable;
+import java.io.IOException;
+import java.io.InvalidObjectException;
+import java.io.ObjectInputStream;
+import java.io.ObjectStreamException;
+
+/**
+ * This is the common base class of all Java language enumeration types.
+ *
+ * More information about enums, including descriptions of the
+ * implicitly declared methods synthesized by the compiler, can be
+ * found in section 8.9 of
+ * <cite>The Java™ Language Specification</cite>.
+ *
+ * <p> Note that when using an enumeration type as the type of a set
+ * or as the type of the keys in a map, specialized and efficient
+ * {@linkplain java.util.EnumSet set} and {@linkplain
+ * java.util.EnumMap map} implementations are available.
+ *
+ * @param <E> The enum type subclass
+ * @author Josh Bloch
+ * @author Neal Gafter
+ * @see Class#getEnumConstants()
+ * @see java.util.EnumSet
+ * @see java.util.EnumMap
+ * @since 1.5
+ */
+@SuppressWarnings("serial") // No serialVersionUID needed due to
+ // special-casing of enum types.
+public abstract class Enum<E extends Enum<E>>
+ implements Comparable<E>, Serializable {
+ /**
+ * The name of this enum constant, as declared in the enum declaration.
+ * Most programmers should use the {@link #toString} method rather than
+ * accessing this field.
+ */
+ private final String name;
+
+ /**
+ * Returns the name of this enum constant, exactly as declared in its
+ * enum declaration.
+ *
+ * <b>Most programmers should use the {@link #toString} method in
+ * preference to this one, as the toString method may return
+ * a more user-friendly name.</b> This method is designed primarily for
+ * use in specialized situations where correctness depends on getting the
+ * exact name, which will not vary from release to release.
+ *
+ * @return the name of this enum constant
+ */
+ public final String name() {
+ return name;
+ }
+
+ /**
+ * The ordinal of this enumeration constant (its position
+ * in the enum declaration, where the initial constant is assigned
+ * an ordinal of zero).
+ *
+ * Most programmers will have no use for this field. It is designed
+ * for use by sophisticated enum-based data structures, such as
+ * {@link java.util.EnumSet} and {@link java.util.EnumMap}.
+ */
+ private final int ordinal;
+
+ /**
+ * Returns the ordinal of this enumeration constant (its position
+ * in its enum declaration, where the initial constant is assigned
+ * an ordinal of zero).
+ *
+ * Most programmers will have no use for this method. It is
+ * designed for use by sophisticated enum-based data structures, such
+ * as {@link java.util.EnumSet} and {@link java.util.EnumMap}.
+ *
+ * @return the ordinal of this enumeration constant
+ */
+ public final int ordinal() {
+ return ordinal;
+ }
+
+ /**
+ * Sole constructor. Programmers cannot invoke this constructor.
+ * It is for use by code emitted by the compiler in response to
+ * enum type declarations.
+ *
+ * @param name - The name of this enum constant, which is the identifier
+ * used to declare it.
+ * @param ordinal - The ordinal of this enumeration constant (its position
+ * in the enum declaration, where the initial constant is assigned
+ * an ordinal of zero).
+ */
+ protected Enum(String name, int ordinal) {
+ this.name = name;
+ this.ordinal = ordinal;
+ }
+
+ /**
+ * Returns the name of this enum constant, as contained in the
+ * declaration. This method may be overridden, though it typically
+ * isn't necessary or desirable. An enum type should override this
+ * method when a more "programmer-friendly" string form exists.
+ *
+ * @return the name of this enum constant
+ */
+ public String toString() {
+ return name;
+ }
+
+ /**
+ * Returns true if the specified object is equal to this
+ * enum constant.
+ *
+ * @param other the object to be compared for equality with this object.
+ * @return true if the specified object is equal to this
+ * enum constant.
+ */
+ public final boolean equals(Object other) {
+ return this==other;
+ }
+
+ /**
+ * Returns a hash code for this enum constant.
+ *
+ * @return a hash code for this enum constant.
+ */
+ public final int hashCode() {
+ return super.hashCode();
+ }
+
+ /**
+ * Throws CloneNotSupportedException. This guarantees that enums
+ * are never cloned, which is necessary to preserve their "singleton"
+ * status.
+ *
+ * @return (never returns)
+ */
+ protected final Object clone() throws CloneNotSupportedException {
+ throw new CloneNotSupportedException();
+ }
+
+ /**
+ * Compares this enum with the specified object for order. Returns a
+ * negative integer, zero, or a positive integer as this object is less
+ * than, equal to, or greater than the specified object.
+ *
+ * Enum constants are only comparable to other enum constants of the
+ * same enum type. The natural order implemented by this
+ * method is the order in which the constants are declared.
+ */
+ public final int compareTo(E o) {
+ Enum<?> other = (Enum<?>)o;
+ Enum<E> self = this;
+ if (self.getClass() != other.getClass() && // optimization
+ self.getDeclaringClass() != other.getDeclaringClass())
+ throw new ClassCastException();
+ return self.ordinal - other.ordinal;
+ }
+
+ /**
+ * Returns the Class object corresponding to this enum constant's
+ * enum type. Two enum constants e1 and e2 are of the
+ * same enum type if and only if
+ * e1.getDeclaringClass() == e2.getDeclaringClass().
+ * (The value returned by this method may differ from the one returned
+ * by the {@link Object#getClass} method for enum constants with
+ * constant-specific class bodies.)
+ *
+ * @return the Class object corresponding to this enum constant's
+ * enum type
+ */
+ @SuppressWarnings("unchecked")
+ public final Class<E> getDeclaringClass() {
+ Class<?> clazz = getClass();
+ Class<?> zuper = clazz.getSuperclass();
+ return (zuper == Enum.class) ? (Class<E>)clazz : (Class<E>)zuper;
+ }
+
+ /**
+ * Returns the enum constant of the specified enum type with the
+ * specified name. The name must match exactly an identifier used
+ * to declare an enum constant in this type. (Extraneous whitespace
+ * characters are not permitted.)
+ *
+ * <p>Note that for a particular enum type {@code T}, the
+ * implicitly declared {@code public static T valueOf(String)}
+ * method on that enum may be used instead of this method to map
+ * from a name to the corresponding enum constant. All the
+ * constants of an enum type can be obtained by calling the
+ * implicit {@code public static T[] values()} method of that
+ * type.
+ *
+ * @param <T> The enum type whose constant is to be returned
+ * @param enumType the {@code Class} object of the enum type from which
+ * to return a constant
+ * @param name the name of the constant to return
+ * @return the enum constant of the specified enum type with the
+ * specified name
+ * @throws IllegalArgumentException if the specified enum type has
+ * no constant with the specified name, or the specified
+ * class object does not represent an enum type
+ * @throws NullPointerException if {@code enumType} or {@code name}
+ * is null
+ * @since 1.5
+ */
+ public static <T extends Enum<T>> T valueOf(Class<T> enumType,
+ String name) {
+ T result = enumType.enumConstantDirectory().get(name);
+ if (result != null)
+ return result;
+ if (name == null)
+ throw new NullPointerException("Name is null");
+ throw new IllegalArgumentException(
+ "No enum constant " + enumType.getCanonicalName() + "." + name);
+ }
+
+ /**
+ * enum classes cannot have finalize methods.
+ */
+ @SuppressWarnings("deprecation")
+ protected final void finalize() { }
+
+ /**
+ * prevent default deserialization
+ */
+ private void readObject(ObjectInputStream in) throws IOException,
+ ClassNotFoundException {
+ throw new InvalidObjectException("can't deserialize enum");
+ }
+
+ private void readObjectNoData() throws ObjectStreamException {
+ throw new InvalidObjectException("can't deserialize enum");
+ }
+}