org.jclouds.virtualbox.functions.admin.ImagesToYamlImagesFromYamlDescriptor.java Source code

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Here is the source code for org.jclouds.virtualbox.functions.admin.ImagesToYamlImagesFromYamlDescriptor.java

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/*
 * 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.virtualbox.functions.admin;

import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkState;

import java.util.List;
import java.util.Map;

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

import org.jclouds.compute.domain.Image;
import org.jclouds.virtualbox.domain.YamlImage;
import org.jclouds.virtualbox.functions.YamlImagesFromFileConfig;
import org.yaml.snakeyaml.Loader;
import org.yaml.snakeyaml.TypeDescription;
import org.yaml.snakeyaml.Yaml;
import org.yaml.snakeyaml.constructor.Constructor;

import com.google.common.base.Supplier;
import com.google.common.collect.Maps;

/**
 * @author Andrea Turli
 */
@Singleton
public class ImagesToYamlImagesFromYamlDescriptor implements Supplier<Map<Image, YamlImage>> {

    private String yamlDescriptor;

    @Inject
    public ImagesToYamlImagesFromYamlDescriptor(YamlImagesFromFileConfig yamlDescriptorSupplier) {
        this.yamlDescriptor = yamlDescriptorSupplier.get();
        checkNotNull(yamlDescriptor, "yaml descriptor");
        checkState(!yamlDescriptor.equals(""), "yaml descriptor is empty");
    }

    /**
     * Type-safe config class for YAML
     * 
     */
    public static class Config {
        public List<YamlImage> images;
    }

    @Override
    public Map<Image, YamlImage> get() {

        Constructor constructor = new Constructor(Config.class);

        TypeDescription imageDesc = new TypeDescription(YamlImage.class);
        imageDesc.putListPropertyType("images", String.class);
        constructor.addTypeDescription(imageDesc);

        // Issue 855: testng is rev-locking us to snakeyaml 1.6
        // we have to use old constructor until this is fixed
        Yaml yaml = new Yaml(new Loader(constructor));
        Config config = (Config) yaml.load(yamlDescriptor);
        checkState(config != null, "missing config: class");
        checkState(config.images != null, "missing images: collection");

        Map<Image, YamlImage> backingMap = Maps.newLinkedHashMap();
        for (YamlImage yamlImage : config.images) {
            backingMap.put(YamlImage.toImage.apply(yamlImage), yamlImage);
        }
        return backingMap;
    }

}