org.jclouds.aws.ec2.binders.BindUserGroupsToIndexedFormParams Maven / Gradle / Ivy

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/**
 *
 * Copyright (C) 2010 Cloud Conscious, LLC. 
 *
 * ====================================================================
 * 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 org.jclouds.aws.ec2.binders;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import static org.jclouds.aws.ec2.util.EC2Utils.indexIterableToFormValuesWithPrefix;

import javax.inject.Singleton;

import org.jclouds.http.HttpRequest;
import org.jclouds.rest.Binder;

import com.google.common.collect.Iterables;

/**
 * Binds the Iterable to query parameters named with UserGroup.index
 * 
 * @author Adrian Cole
 */
@Singleton
public class BindUserGroupsToIndexedFormParams implements Binder {

   public void bindToRequest(HttpRequest request, Object input) {
      checkArgument(checkNotNull(input, "input") instanceof Iterable,
               "this binder is only valid for Iterable: " + input.getClass());
      checkValidUserGroup(input);
      indexIterableToFormValuesWithPrefix(request, "UserGroup", input);
   }

   private void checkValidUserGroup(Object input) {
      Iterable values = (Iterable) input;
      long size = Iterables.size(values);
      checkArgument(size == 0 || (size == 1 && Iterables.getOnlyElement(values).equals("all")),
               "only supported UserGroup is 'all'");
   }

}