content: /*
   * Copyright 2012-2020 the original author or authors.
   *
   * 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
   *
   *      https://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.springframework.boot.convert;
  
  import java.io.File;
  import java.io.IOException;
  
  import org.springframework.core.convert.converter.Converter;
  import org.springframework.core.io.DefaultResourceLoader;
  import org.springframework.core.io.Resource;
  import org.springframework.core.io.ResourceLoader;
  import org.springframework.util.ResourceUtils;
  
  /**
   * {@link Converter} to convert from a {@link String} to a {@link File}. Supports basic
   * file conversion as well as file URLs.
   *
   * @author Phillip Webb
   */
  class StringToFileConverter implements Converter<String, File> {
  
  	private static final ResourceLoader resourceLoader = new DefaultResourceLoader(null);
  
  	@Override
  	public File convert(String source) {
  		if (ResourceUtils.isUrl(source)) {
  			return getFile(resourceLoader.getResource(source));
  		}
  		File file = new File(source);
  		if (file.exists()) {
  			return file;
  		}
  		Resource resource = resourceLoader.getResource(source);
  		if (resource.exists()) {
  			return getFile(resource);
  		}
  		return file;
  	}
  
  	private File getFile(Resource resource) {
  		try {
  			return resource.getFile();
  		}
  		catch (IOException ex) {
  			throw new IllegalStateException("Could not retrieve file for " + resource + ": " + ex.getMessage());
  		}
  	}
  
  }
  