/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.ec2.compute.functions;
import static com.google.common.base.Preconditions.checkState;
import static com.google.common.collect.Maps.uniqueIndex;
import java.util.Map;
import javax.inject.Singleton;
import org.jclouds.compute.domain.Image;
import org.jclouds.ec2.compute.domain.RegionAndName;
import com.google.common.base.Function;
/**
* @author Adrian Cole
*/
@Singleton
public class ImagesToRegionAndIdMap implements Function<Iterable<? extends Image>, Map<RegionAndName, ? extends Image>> {
public static Map<RegionAndName, ? extends Image> imagesToMap(Iterable<? extends Image> input) {
return new ImagesToRegionAndIdMap().apply(input);
}
@Override
public Map<RegionAndName, ? extends Image> apply(Iterable<? extends Image> input) {
return uniqueIndex(input, new Function<Image, RegionAndName>() {
@Override
public RegionAndName apply(Image from) {
checkState(from.getLocation() != null,
"in ec2, image locations cannot be null; typically, they are Region-scoped");
return new RegionAndName(from.getLocation().getId(), from.getProviderId());
}
});
}
}