user/src/com/google/gwt/requestfactory/client/impl/AbstractEnumRequest.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.requestfactory.client.impl;

import com.google.gwt.valuestore.shared.SyncResult;

import java.util.Set;

/**
 * <p>
 * <span style="color:red">Experimental API: This class is still under rapid
 * development, and is very likely to be deleted. Use it at your own risk.
 * </span>
 * </p>
 * Abstract implementation of
 * {@link com.google.gwt.requestfactory.shared.RequestFactory.RequestObject
 * RequestFactory.RequestObject} for requests that return Enum types.
 * 
 * @param <E> an enum type
 */
public abstract class AbstractEnumRequest<E extends Enum<E>> extends
    AbstractPrimitiveRequest<Integer, AbstractEnumRequest<E>> {

  private E[] enumValues;

  public AbstractEnumRequest(RequestFactoryJsonImpl requestFactory, E[] enumValues) {
    super(requestFactory);
    this.enumValues = enumValues;
  }

  @Override
  public void handlePrimitiveResult(String responseText,
      Set<SyncResult> syncResults) {
    int ordinal = Integer.valueOf(responseText);
    for (E e : enumValues) {
      if (ordinal == e.ordinal()) {
        receiver.onSuccess(ordinal, syncResults);
      }
    }
    throw new IllegalArgumentException("Invalid enum ordinal value " + ordinal);
  }

  @Override
  protected AbstractEnumRequest<E> getThis() {
    return this;
  }
}