org.jclouds.virtualbox.functions.YamlImagesFromFileConfig Maven / Gradle / Ivy

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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.virtualbox.functions;

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

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;

import javax.inject.Inject;
import javax.inject.Named;

import org.apache.commons.io.IOUtils;
import org.jclouds.virtualbox.config.VirtualBoxConstants;

import com.google.common.base.Supplier;

/**
 * A supplier for vbox yaml config that reads a yaml whose path is stored under
 * VirtualBoxConstants.VIRTUALBOX_IMAGES_DESCRIPTOR.
 * 
 * @author dralves
 * 
 */
public class YamlImagesFromFileConfig implements Supplier {

   private String yamlFilePath;

   @Inject
   public YamlImagesFromFileConfig(@Named(VirtualBoxConstants.VIRTUALBOX_IMAGES_DESCRIPTOR) String yamlFilePath) {
      this.yamlFilePath = yamlFilePath;
   }

   @Override
   public String get() {
      try {
         File yamlFile = new File(yamlFilePath);
         String yamlDesc = null;
         // if the yaml file does not exist just use default-images.yaml
         if (!yamlFile.exists()) {
            yamlDesc = IOUtils.toString(new InputStreamReader(getClass().getResourceAsStream("/default-images.yaml")));
         } else {
            yamlDesc = IOUtils.toString(new FileInputStream(yamlFile));
         }
         checkNotNull(yamlDesc, "yaml descriptor");
         return yamlDesc;
      } catch (IOException e) {
         throw new RuntimeException("error reading yaml file");
      }
   }
}