| /* |
| * Copyright 2008 Google Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); you may not |
| * use this file except in compliance with the License. You may obtain a copy of |
| * the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| * License for the specific language governing permissions and limitations under |
| * the License. |
| */ |
| package java.lang; |
| |
| import com.google.gwt.core.client.JavaScriptObject; |
| |
| import java.io.Serializable; |
| |
| /** |
| * The first-class representation of an enumeration. |
| * |
| * @param <E> |
| */ |
| public abstract class Enum<E extends Enum<E>> implements Comparable<E>, |
| Serializable { |
| |
| public static <T extends Enum<T>> T valueOf(Class<T> enumType, String name) { |
| |
| // Have to explicitly test for null, otherwise we won't get |
| // NullPointerExceptions in web mode |
| if (enumType == null || name == null) { |
| throw new NullPointerException("enumType and name must not be null."); |
| } |
| |
| // TODO(scottb) Work some compiler magic to improve this from a linear |
| // search to a map lookup. |
| T[] constants = enumType.getEnumConstants(); |
| |
| if (constants == null) { |
| throw new IllegalArgumentException( |
| enumType.getName() + " is not an enum."); |
| } |
| |
| for (T constant : constants) { |
| if (constant.name().equals(name)) { |
| return constant; |
| } |
| } |
| |
| throw new IllegalArgumentException(enumType.getName() |
| + " does not have an enum constant named, " + name + "."); |
| } |
| |
| protected static <T extends Enum<T>> T valueOf(JavaScriptObject map, |
| String name) { |
| T result = Enum.<T> valueOf0(map, "_" + name); |
| if (result == null) { |
| throw new IllegalArgumentException(name); |
| } |
| return result; |
| } |
| |
| private static native <T extends Enum<T>> T valueOf0(JavaScriptObject map, |
| String name) /*-{ |
| return map[name]; |
| }-*/; |
| |
| private final String name; |
| |
| private final int ordinal; |
| |
| protected Enum(String name, int ordinal) { |
| this.name = name; |
| this.ordinal = ordinal; |
| } |
| |
| public final int compareTo(E other) { |
| // TODO: will a bridge method do the cast for us? |
| // if (this.getDeclaringClass() != other.getDeclaringClass()) { |
| // throw new ClassCastException(); |
| // } |
| return this.ordinal - other.ordinal; |
| } |
| |
| @Override |
| public final boolean equals(Object other) { |
| return this == other; |
| } |
| |
| @SuppressWarnings("unchecked") |
| public final Class<E> getDeclaringClass() { |
| Class clazz = getClass(); |
| assert clazz != null : "clazz"; |
| |
| // Don't use getSuperclass() to allow that method to be pruned for most |
| // class types |
| Class superclass = clazz.getEnumSuperclass(); |
| assert superclass != null : "superclass"; |
| |
| return (superclass == Enum.class) ? clazz : superclass; |
| } |
| |
| @Override |
| public final int hashCode() { |
| return super.hashCode(); |
| } |
| |
| public final String name() { |
| return name; |
| } |
| |
| public final int ordinal() { |
| return ordinal; |
| } |
| |
| @Override |
| public String toString() { |
| return name; |
| } |
| |
| } |