org.jclouds.openstack.nova.v1_1.util.NovaUtils.java Source code

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Here is the source code for org.jclouds.openstack.nova.v1_1.util.NovaUtils.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.openstack.nova.v1_1.util;

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

import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableMultimap;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Multimap;
import com.google.common.collect.ImmutableMultimap.Builder;

/**
 * 
 * @author Adrian Cole
 */
public class NovaUtils {

    /**
     * The traditional way to represent a graph in Java is Map<V, Set<V>>, which is awkward in a
     * number of ways. Guava's Multimap framework makes it easy to handle a mapping from keys to
     * multiple values.
     * <p/>
     * Until we write or discover a gson Multimap deserializer, we may be stuck with this.
     * 
     * TODO: ask on stackoverflow and/or jesse wilson
     */
    @Deprecated
    public static <K, V> Map<K, Set<V>> toOldSchool(Multimap<K, V> in) {
        ImmutableMap.Builder<K, Set<V>> out = ImmutableMap.<K, Set<V>>builder();
        for (K type : in.keySet())
            out.put(type, ImmutableSet.copyOf(in.get(type)));
        return out.build();
    }

    /**
     * @see #toOldSchool
     */
    @Deprecated
    public static <K, V> ImmutableMultimap<K, V> fromOldSchool(Map<K, Set<V>> in) {
        Builder<K, V> out = ImmutableMultimap.<K, V>builder();
        for (K type : in.keySet())
            out.putAll(type, ImmutableSet.copyOf(in.get(type)));
        return out.build();
    }
}