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package ftbsc.lll.mapper;
import ftbsc.lll.exceptions.InvalidResourceException;
import java.io.*;
import java.net.URI;
import java.net.URISyntaxException;
import java.nio.charset.StandardCharsets;
import java.util.*;
import java.util.stream.Collectors;
/**
* The main class of the mapper library. It loads all the
* valid {@link IMappingFormat}s and gets information from them.
*/
public class MapperProvider {
/**
* The static instance of the provider.
*/
private static MapperProvider INSTANCE = null;
/**
* @return the static instance of the provider
*/
private static MapperProvider getInstance() {
return INSTANCE == null ? (INSTANCE = new MapperProvider()) : INSTANCE;
}
/**
* A {@link Set} containing all the loaded mapper classes.
*/
private Set<IMappingFormat> loadedMappers = null;
/**
* Loads the mapper classes into a {@link Set}.
*/
private void loadMappers() {
this.loadedMappers = new HashSet<>();
for(IMappingFormat mapper: ServiceLoader.load(IMappingFormat.class, this.getClass().getClassLoader()))
this.loadedMappers.add(mapper);
if(this.loadedMappers.isEmpty())
throw new RuntimeException("Something went wrong: no mapper types were loaded successfully!");
}
/**
* Loads all valid parsers available in the classpath (via the Java Service API),
* attempts to load the resource at given location and to populate a mapper with
* its data.
* @param data the file as a list of strings
* @return a {@link IMappingFormat} (populating it is left to the user)
*/
public static IMappingFormat getMapper(List<String> data) {
if(getInstance().loadedMappers == null)
getInstance().loadMappers();
return getInstance().loadedMappers.stream()
.filter(m -> m.claim(data))
.max(Comparator.comparingInt(IMappingFormat::priority))
.orElseThrow(InvalidResourceException::new);
}
/**
* Gets a resource and parses it into a {@link List} of {@link String}s.
* @param location either a URL or a local path
* @return a {@link List} containing the lines of the resource
* @throws InvalidResourceException if provided an invalid resource
*/
public static List<String> fetchFromLocalOrRemote(String location) {
InputStream targetStream;
try {
URI target = new URI(location);
targetStream = target.toURL().openStream();
} catch(URISyntaxException | IllegalArgumentException | IOException e) {
//may be a local file path
File f = new File(location);
try {
targetStream = new FileInputStream(f);
} catch(FileNotFoundException ex) {
throw new InvalidResourceException(location);
}
}
return new BufferedReader(new InputStreamReader(
targetStream,
StandardCharsets.UTF_8)
).lines().collect(Collectors.toList());
}
}
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zaaarf