com.google.gwt.user.rebind.Enum Maven / Gradle / Ivy
/*
* Copyright 2007 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 com.google.gwt.user.rebind;
import java.util.Map;
/**
* Common base class for Enum-like 1.4 classes, often needed for generator-like
* functionality.
*/
class Enum {
/**
* Requires the specified object from the pool.
*
* @param key the key associated with the Enum
* @param pool pool to draw key from
* @return associated Enum
*/
public static Enum require(String key, Map pool) {
Enum t = pool.get(key);
if (t == null) {
throw new IllegalArgumentException(key
+ " is not a valid Enum type. Current options are " + pool.keySet());
}
return t;
}
/**
* Associated key.
*/
final String key;
/**
* Creates a new Enum in a given pool.
*
* @param key associated key
* @param pool associated pool
*/
protected Enum(String key, Map pool) {
this.key = key;
pool.put(key, this);
}
/**
* @see java.lang.Object#toString()
*/
@Override
public String toString() {
return key;
}
}