@Override
public Changes changes(long since, int limit) {
Preconditions.checkState(this.isOpen(), "Database is closed");
Preconditions.checkArgument(limit > 0, "Limit must be positive number");
since = since >= 0 ? since : 0;
String[] args = {Long.toString(since), Long.toString(since + limit)};
Cursor cursor = null;
try {
Long lastSequence = since;
List<Long> ids = new ArrayList<Long>();
cursor = this.sqlDb.rawQuery(SQL_CHANGE_IDS_SINCE_LIMIT, args);
while (cursor.moveToNext()) {
ids.add(cursor.getLong(0));
lastSequence = Math.max(lastSequence, cursor.getLong(1));
}
List<DocumentRevision> results = this.getDocumentsWithInternalIds(ids);
if (results.size() != ids.size()) {
throw new IllegalStateException(
"The number of document does not match number of ids, "
+ "something must be wrong here.");
}
return new Changes(lastSequence, results);
} catch (SQLException e) {
throw new IllegalStateException(
"Error querying all changes since: " + since + ", limit: " + limit, e);
} finally {
DatabaseUtils.closeCursorQuietly(cursor);
}
}
static BasicDocumentRevision getFullRevisionFromCurrentCursor(Cursor cursor) {
String docId = cursor.getString(0);
long internalId = cursor.getLong(1);
String revId = cursor.getString(2);
long sequence = cursor.getLong(3);
byte[] json = cursor.getBlob(4);
boolean current = cursor.getInt(5) > 0;
boolean deleted = cursor.getInt(6) > 0;
long parent = -1L;
if (cursor.columnType(7) == Cursor.FIELD_TYPE_INTEGER) {
parent = cursor.getLong(7);
} else if (cursor.columnType(7) == Cursor.FIELD_TYPE_NULL) {
} else {
throw new IllegalArgumentException("Unexpected type: " + cursor.columnType(7));
}
DocumentRevisionBuilder builder =
new DocumentRevisionBuilder()
.setDocId(docId)
.setRevId(revId)
.setBody(BasicDocumentBody.bodyWith(json))
.setDeleted(deleted)
.setSequence(sequence)
.setInternalId(internalId)
.setCurrnet(current)
.setParent(parent);
return builder.buildBasicDBObject();
}
@Override
public long getDocNumericId(String docId) {
Preconditions.checkState(this.isOpen(), "Database is closed");
Preconditions.checkArgument(
!Strings.isNullOrEmpty(docId), "Input document id can not be empty");
Cursor cursor = null;
try {
cursor = this.sqlDb.rawQuery("SELECT doc_id FROM docs WHERE docid = ?", new String[] {docId});
if (cursor.moveToFirst()) {
return cursor.getLong(0);
}
} catch (SQLException e) {
Log.e(LOG_TAG, "Error getting doc numeric id", e);
} finally {
DatabaseUtils.closeCursorQuietly(cursor);
}
return -1;
}
@Override
public long getLastSequence() {
Preconditions.checkState(this.isOpen(), "Database is closed");
String sql = "SELECT MAX(sequence) FROM revs";
Cursor cursor = null;
long result = 0;
try {
cursor = this.sqlDb.rawQuery(sql, null);
if (cursor.moveToFirst()) {
if (cursor.columnType(0) == Cursor.FIELD_TYPE_INTEGER) {
result = cursor.getLong(0);
} else if (cursor.columnType(0) == Cursor.FIELD_TYPE_NULL) {
result = SEQUENCE_NUMBER_START;
} else {
throw new IllegalStateException("SQLite return an unexpected value.");
}
}
} catch (SQLException e) {
Log.e(LOG_TAG, "Error getting last sequence", e);
} finally {
DatabaseUtils.closeCursorQuietly(cursor);
}
return result;
}