com.dowdandassociates.gentoo.bootstrap.SimpleImageProvider.java Source code

Introduction

Here is the source code for com.dowdandassociates.gentoo.bootstrap.SimpleImageProvider.java

Source

/*
 *
 * SimpleImageProvider.java
 *
 *-----------------------------------------------------------------------------
 * Copyright 2013 Dowd and Associates
 *
 * Licensed 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 com.dowdandassociates.gentoo.bootstrap;

import com.amazonaws.services.ec2.AmazonEC2;
import com.amazonaws.services.ec2.model.DescribeImagesRequest;
import com.amazonaws.services.ec2.model.DescribeImagesResult;
import com.amazonaws.services.ec2.model.Image;

import com.google.common.base.Optional;

import com.google.inject.Provider;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public abstract class SimpleImageProvider implements Provider<Optional<Image>> {
    private static Logger log = LoggerFactory.getLogger(SimpleImageProvider.class);

    private AmazonEC2 ec2Client;

    public SimpleImageProvider(AmazonEC2 ec2Client) {
        this.ec2Client = ec2Client;
    }

    public Optional<Image> get() {
        String imageId = getImageId();

        if (null == imageId) {
            return Optional.absent();
        }

        DescribeImagesResult result = ec2Client.describeImages(new DescribeImagesRequest().withImageIds(imageId));

        if (result.getImages().isEmpty()) {
            return Optional.absent();
        }

        return Optional.fromNullable(result.getImages().get(0));
    }

    protected abstract String getImageId();
}