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package org.yuzu.yuzu_emu.utils;
import android.content.Context;
import android.net.Uri;
import androidx.annotation.Nullable;
import androidx.documentfile.provider.DocumentFile;
import org.yuzu.yuzu_emu.YuzuApplication;
import org.yuzu.yuzu_emu.model.MinimalDocumentFile;
import java.util.HashMap;
import java.util.Map;
import java.util.StringTokenizer;
public class DocumentsTree {
private DocumentsNode root;
private final Context context;
public static final String DELIMITER = "/";
public DocumentsTree() {
context = YuzuApplication.getAppContext();
}
public void setRoot(Uri rootUri) {
root = null;
root = new DocumentsNode();
root.uri = rootUri;
root.isDirectory = true;
}
public int openContentUri(String filepath, String openmode) {
DocumentsNode node = resolvePath(filepath);
if (node == null) {
return -1;
}
return FileUtil.openContentUri(context, node.uri.toString(), openmode);
}
public long getFileSize(String filepath) {
DocumentsNode node = resolvePath(filepath);
if (node == null || node.isDirectory) {
return 0;
}
return FileUtil.getFileSize(context, node.uri.toString());
}
public boolean Exists(String filepath) {
return resolvePath(filepath) != null;
}
@Nullable
private DocumentsNode resolvePath(String filepath) {
StringTokenizer tokens = new StringTokenizer(filepath, DELIMITER, false);
DocumentsNode iterator = root;
while (tokens.hasMoreTokens()) {
String token = tokens.nextToken();
if (token.isEmpty()) continue;
iterator = find(iterator, token);
if (iterator == null) return null;
}
return iterator;
}
@Nullable
private DocumentsNode find(DocumentsNode parent, String filename) {
if (parent.isDirectory && !parent.loaded) {
structTree(parent);
}
return parent.children.get(filename);
}
/**
* Construct current level directory tree
* @param parent parent node of this level
*/
private void structTree(DocumentsNode parent) {
MinimalDocumentFile[] documents = FileUtil.listFiles(context, parent.uri);
for (MinimalDocumentFile document: documents) {
DocumentsNode node = new DocumentsNode(document);
node.parent = parent;
parent.children.put(node.name, node);
}
parent.loaded = true;
}
public static boolean isNativePath(String path) {
if (path.length() > 0) {
return path.charAt(0) == '/';
}
return false;
}
private static class DocumentsNode {
private DocumentsNode parent;
private final Map<String, DocumentsNode> children = new HashMap<>();
private String name;
private Uri uri;
private boolean loaded = false;
private boolean isDirectory = false;
private DocumentsNode() {}
private DocumentsNode(MinimalDocumentFile document) {
name = document.getFilename();
uri = document.getUri();
isDirectory = document.isDirectory();
loaded = !isDirectory;
}
private DocumentsNode(DocumentFile document, boolean isCreateDir) {
name = document.getName();
uri = document.getUri();
isDirectory = isCreateDir;
loaded = true;
}
private void rename(String name) {
if (parent == null) {
return;
}
parent.children.remove(this.name);
this.name = name;
parent.children.put(name, this);
}
}
}
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