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package bjc.utils.components;
import java.io.File;
import java.nio.file.Path;
import java.util.HashMap;
import java.util.Map;
import java.util.function.Function;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import bjc.utils.funcdata.FunctionalList;
/**
* A component repository that loads its components from files in a
* directory
*
* @author ben
*
* @param <E>
* The type of component being read in
*/
public class FileComponentRepository<E extends IDescribedComponent>
implements IComponentRepository<E> {
private static final Logger CLASS_LOGGER =
LoggerFactory.getLogger(FileComponentRepository.class);
/**
* The internal storage of components
*/
private Map<String, E> components;
/**
* The path that all the components came from
*/
private Path sourceDirectory;
/**
* Create a new component repository sourcing components from files in
* a directory
*
* An exception thrown during the loading of a component will only
* cause the loading of that component to fail, but a warning will be
* logged.
*
* @param directory
* The directory to read component files from
* @param componentReader
* The function to use to convert files to components
*/
public FileComponentRepository(File directory,
Function<File, E> componentReader) {
if (!directory.isDirectory()) {
throw new IllegalArgumentException("File " + directory
+ " is not a directory.\n"
+ "Components can only be read from a directory");
}
components = new HashMap<>();
sourceDirectory = directory.toPath().toAbsolutePath();
File[] listFiles = directory.listFiles();
if (listFiles == null) {
throw new IllegalArgumentException("File " + directory
+ " is not a valid directory.\n"
+ "Components can only be read from a directory");
}
for (File componentFile : listFiles) {
if (componentFile.isDirectory()) {
// Do nothing with directories. They probably contain
// support files for components
} else {
try {
E component = componentReader.apply(componentFile);
if (component == null) {
throw new NullPointerException(
"Component reader read null component");
} else if (!components
.containsKey(component.getName())) {
components.put(component.getName(), component);
} else {
CLASS_LOGGER.warn("Found a duplicate component.\n"
+ "Multiple versions of the same component are not currently supported.\n"
+ "The component" + component
+ " will not be registered .");
}
} catch (Exception ex) {
CLASS_LOGGER
.warn("Error found reading component from file "
+ componentFile.toString()
+ ". This component will not be loaded");
}
}
}
}
@Override
public FunctionalList<E> getComponentList() {
FunctionalList<E> returnedList = new FunctionalList<>();
components
.forEach((name, component) -> returnedList.add(component));
return returnedList;
}
@Override
public Map<String, E> getComponents() {
return components;
}
@Override
public String getSource() {
return "Components read from directory " + sourceDirectory + ".";
}
@Override
public E getComponentByName(String name) {
return components.get(name);
}
}
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