/*
* Copyright (c) 2017, PostgreSQL Global Development Group
* See the LICENSE file in the project root for more information.
*/
package org.postgresql.jdbc;
import java.sql.
SQLWarning;
/**
* Wrapper class for SQLWarnings that provides an optimisation to add
* new warnings to the tail of the SQLWarning singly linked list, avoiding Θ(n) insertion time
* of calling #setNextWarning on the head. By encapsulating this into a single object it allows
* users(ie PgStatement) to atomically set and clear the warning chain.
*/
class
PSQLWarningWrapper {
private final
SQLWarning firstWarning;
private
SQLWarning lastWarning;
PSQLWarningWrapper(
SQLWarning warning) {
firstWarning =
warning;
lastWarning =
warning;
}
void
addWarning(
SQLWarning sqlWarning) {
lastWarning.
setNextWarning(
sqlWarning);
lastWarning =
sqlWarning;
}
SQLWarning getFirstWarning() {
return
firstWarning;
}
}