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package com.keuin.kbackupfabric.backup.incremental;
import com.keuin.kbackupfabric.backup.incremental.identifier.FileIdentifierProvider;
import com.keuin.kbackupfabric.backup.incremental.identifier.ObjectIdentifier;
import com.keuin.kbackupfabric.util.PrintUtil;
import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.*;
/**
* Incremental backup is implemented as git-like file collection.
* Files are called `objects`, the collection contains all files distinguished by their
* identifiers. Usually, identifier is the combination of hash and other short information (such as size and another hash).
* The identifier should use hashes that are strong enough, to prevent possible collisions.
*/
public class ObjectCollectionFactory<T extends ObjectIdentifier> {
private final FileIdentifierProvider<T> identifierFactory;
public ObjectCollectionFactory(FileIdentifierProvider<T> identifierFactory) {
this.identifierFactory = identifierFactory;
}
public ObjectCollection fromDirectory(File directory, Set<String> ignoredFiles) throws IOException {
final Set<ObjectElement> subFiles = new HashSet<>();
final Map<String, ObjectCollection> subCollections = new HashMap<>();
if (!Objects.requireNonNull(directory).isDirectory())
throw new IllegalArgumentException("given file is not a directory");
for (Iterator<Path> iter = Files.walk(directory.toPath(), 1).iterator(); iter.hasNext(); ) {
Path path = iter.next();
if (Files.isSameFile(path, directory.toPath()))
continue;
File file = path.toFile();
if (file.isDirectory()) {
subCollections.put(file.getName(), fromDirectory(file, ignoredFiles));
} else if (!ignoredFiles.contains(file.getName())) {
subFiles.add(new ObjectElement(file.getName(), identifierFactory.fromFile(file)));
} else {
PrintUtil.info(String.format("Skipping file %s.", file.getName()));
}
}
return new ObjectCollection(directory.getName(), subFiles, subCollections);
}
public ObjectCollection fromDirectory(File directory) throws IOException {
return fromDirectory(directory, Collections.emptySet());
}
}
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