2.1/user/src/com/google/gwt/user/client/ui/HasConstrainedValue.java

/*
 * Copyright 2010 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.client.ui;

import java.util.Collection;

/**
 * Implemented by widgets that pick from a set of values.
 * <p>
 * It is up to the implementation to decide (and document) how to behave when
 * {@link #setValue(Object)} is called with a value that is not in the
 * acceptable set. For example, throwing an {@link IllegalArgumentException}, or
 * quietly adding the value to the acceptable set, are both reasonable choices.
 * 
 * @param <T> the type of value
 */
public interface HasConstrainedValue<T> extends HasValue<T> {

  /**
   * Set the acceptable values.
   * 
   * @param values the acceptible values
   */
  void setAcceptableValues(Collection<T> values);
}