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

Introduction

Here is the source code for org.jclouds.ec2.compute.loaders.LoadPublicIpForInstanceOrNull.java

Source

/*
 * 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.loaders;

import java.util.NoSuchElementException;

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

import org.jclouds.ec2.EC2Api;
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 EC2Api client;

    @Inject
    public LoadPublicIpForInstanceOrNull(EC2Api client) {
        this.client = client;
    }

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

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

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