org.jclouds.ec2.compute.functions.LoadPublicIpForInstanceOrNull.java Source code

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Here is the source code for org.jclouds.ec2.compute.functions.LoadPublicIpForInstanceOrNull.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.ec2.compute.functions;

import java.util.NoSuchElementException;

import javax.inject.Inject;
import javax.inject.Singleton;

import org.jclouds.ec2.EC2Client;
import org.jclouds.ec2.compute.domain.RegionAndName;
import org.jclouds.ec2.domain.PublicIpInstanceIdPair;

import com.google.common.base.Predicate;
import com.google.common.cache.CacheLoader;
import com.google.common.collect.Iterables;

/**
 * @author Adrian Cole
 */
@Singleton
public class LoadPublicIpForInstanceOrNull extends CacheLoader<RegionAndName, String> {
    private final EC2Client client;

    @Inject
    public LoadPublicIpForInstanceOrNull(EC2Client client) {
        this.client = client;
    }

    @Override
    public String load(final RegionAndName key) throws Exception {
        try {
            return Iterables.find(client.getElasticIPAddressServices().describeAddressesInRegion(key.getRegion()),
                    new Predicate<PublicIpInstanceIdPair>() {

                        @Override
                        public boolean apply(PublicIpInstanceIdPair input) {
                            return key.getName().equals(input.getInstanceId());
                        }

                    }).getPublicIp();
        } catch (NoSuchElementException e) {
            return null;
        }
    }
}