com.finbourne.horizon.extensions.FileConfigurationLoader Maven / Gradle / Ivy
package com.finbourne.horizon.extensions;
import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.util.Optional;
public class FileConfigurationLoader {
/**
* Loads the API configuration either from the resources in the classpath or directly from
* the file system.
*
* @param apiConfigurationFile name of the resource or absolute path of the configuration file
* @return API configuration file
* @throws IOException if config cannot be found
*/
public File loadConfiguration(String apiConfigurationFile) throws IOException {
Optional configFileFromResource = getConfigFileFromResources(apiConfigurationFile);
if (configFileFromResource.isPresent()) {
return configFileFromResource.get();
}
Optional configFileFromPath = getConfigFileFromPath(apiConfigurationFile);
if (configFileFromPath.isPresent()) {
return configFileFromPath.get();
}
throw new IOException("Cannot find '" + apiConfigurationFile + "' in either classpath resources or as an absolute path.");
}
private Optional getConfigFileFromResources(String apiConfig){
ClassLoader classLoader = getClassLoader();
URL configUrl = classLoader.getResource(apiConfig);
return (configUrl != null) ? Optional.of(new File(configUrl.getFile())) : Optional.empty();
}
private Optional getConfigFileFromPath(String apiConfig){
File configFile = getFile(apiConfig);
return (configFile.exists()) ? Optional.of(configFile) : Optional.empty();
}
// factory methods for test mocking purposes.
public ClassLoader getClassLoader(){
return getClass().getClassLoader();
}
public File getFile(String path){
return new File(path);
}
}