public static int findRootRecord(String rootUrl) throws IOException {
try {
w.lock();
DbConnection.markDirty();
final int root = getNames().enumerate(rootUrl);
final DataInputStream input = readAttribute(1, CHILDREN_ATT);
int[] names = ArrayUtil.EMPTY_INT_ARRAY;
int[] ids = ArrayUtil.EMPTY_INT_ARRAY;
if (input != null) {
try {
final int count = DataInputOutputUtil.readINT(input);
names = ArrayUtil.newIntArray(count);
ids = ArrayUtil.newIntArray(count);
for (int i = 0; i < count; i++) {
final int name = DataInputOutputUtil.readINT(input);
final int id = DataInputOutputUtil.readINT(input);
if (name == root) {
return id;
}
names[i] = name;
ids[i] = id;
}
} finally {
input.close();
}
}
final DataOutputStream output = writeAttribute(1, CHILDREN_ATT, false);
int id;
try {
id = createRecord();
DataInputOutputUtil.writeINT(output, names.length + 1);
for (int i = 0; i < names.length; i++) {
DataInputOutputUtil.writeINT(output, names[i]);
DataInputOutputUtil.writeINT(output, ids[i]);
}
DataInputOutputUtil.writeINT(output, root);
DataInputOutputUtil.writeINT(output, id);
} finally {
output.close();
}
return id;
} finally {
w.unlock();
}
}
private static int findAttributePage(int fileId, String attrId, boolean toWrite)
throws IOException {
checkFileIsValid(fileId);
Storage storage = getAttributesStorage();
int encodedAttrId = DbConnection.getAttributeId(attrId);
int recordId = getAttributeRecordId(fileId);
if (recordId == 0) {
if (!toWrite) return 0;
recordId = storage.createNewRecord();
setAttributeRecordId(fileId, recordId);
} else {
DataInputStream attrRefs = storage.readStream(recordId);
try {
while (attrRefs.available() > 0) {
final int attIdOnPage = DataInputOutputUtil.readINT(attrRefs);
final int attrAddress = DataInputOutputUtil.readINT(attrRefs);
if (attIdOnPage == encodedAttrId) return attrAddress;
}
} finally {
attrRefs.close();
}
}
if (toWrite) {
Storage.AppenderStream appender = storage.appendStream(recordId);
DataInputOutputUtil.writeINT(appender, encodedAttrId);
int attrAddress = storage.createNewRecord();
DataInputOutputUtil.writeINT(appender, attrAddress);
DbConnection.REASONABLY_SMALL.myAttrPageRequested = true;
try {
appender.close();
} finally {
DbConnection.REASONABLY_SMALL.myAttrPageRequested = false;
}
return attrAddress;
}
return 0;
}
public static void deleteRootRecord(int id) throws IOException {
try {
w.lock();
DbConnection.markDirty();
final DataInputStream input = readAttribute(1, CHILDREN_ATT);
assert input != null;
int count;
int[] names;
int[] ids;
try {
count = DataInputOutputUtil.readINT(input);
names = ArrayUtil.newIntArray(count);
ids = ArrayUtil.newIntArray(count);
for (int i = 0; i < count; i++) {
names[i] = DataInputOutputUtil.readINT(input);
ids[i] = DataInputOutputUtil.readINT(input);
}
} finally {
input.close();
}
final int index = ArrayUtil.find(ids, id);
assert index >= 0;
names = ArrayUtil.remove(names, index);
ids = ArrayUtil.remove(ids, index);
final DataOutputStream output = writeAttribute(1, CHILDREN_ATT, false);
try {
DataInputOutputUtil.writeINT(output, count - 1);
for (int i = 0; i < names.length; i++) {
DataInputOutputUtil.writeINT(output, names[i]);
DataInputOutputUtil.writeINT(output, ids[i]);
}
} finally {
output.close();
}
} finally {
w.unlock();
}
}
public static void updateList(int id, @NotNull int[] children) {
try {
w.lock();
DbConnection.markDirty();
final DataOutputStream record = writeAttribute(id, CHILDREN_ATT, false);
DataInputOutputUtil.writeINT(record, children.length);
for (int child : children) {
if (child == id) {
LOG.error("Cyclic parent child relations");
} else {
child = child > id ? child - id : -child;
DataInputOutputUtil.writeINT(record, child);
}
}
record.close();
} catch (Throwable e) {
throw DbConnection.handleError(e);
} finally {
w.unlock();
}
}