org.jclouds.functions.JoinOnK2.java Source code

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Here is the source code for org.jclouds.functions.JoinOnK2.java

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/**
 * Licensed to jclouds, Inc. (jclouds) under one or more
 * contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  jclouds 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.functions;

import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

import com.google.common.base.Function;
import com.google.common.base.Supplier;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableMap.Builder;

public class JoinOnK2<K, K2, V> implements Function<Map<K, Supplier<Set<K2>>>, Map<K2, Supplier<V>>> {
    private final Supplier<Map<K2, Supplier<V>>> regionToEndpointSupplier;

    public JoinOnK2(Supplier<Map<K2, Supplier<V>>> regionToEndpointSupplier) {
        this.regionToEndpointSupplier = regionToEndpointSupplier;
    }

    @Override
    public Map<K2, Supplier<V>> apply(Map<K, Supplier<Set<K2>>> regionToZones) {
        Map<K2, Supplier<V>> regionToEndpoint = regionToEndpointSupplier.get();
        Builder<K2, Supplier<V>> builder = ImmutableMap.builder();
        for (Entry<K, Supplier<Set<K2>>> entry : regionToZones.entrySet()) {
            for (K2 zone : entry.getValue().get()) {
                builder.put(zone, regionToEndpoint.get(entry.getKey()));
            }
        }
        return builder.build();
    }
}