74 lines
2.5 KiB
C++
74 lines
2.5 KiB
C++
#ifndef UNITTEST_GUNIT_FAKE_INTEGER_ITERATOR_H_
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#define UNITTEST_GUNIT_FAKE_INTEGER_ITERATOR_H_
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/* Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have included with MySQL.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License, version 2.0, for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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#include <random>
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#include <string>
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#include <vector>
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#include "sql/field.h"
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#include "sql/row_iterator.h"
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#include "sql/sql_class.h"
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// An implementation of a RowIterator that contains a user-defined set of
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// integer values, without having to set up the entire SQL machinery. It works
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// just like any other iterator; you call Init() before doing any reads, and you
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// call Read() until it returns -1 (no more data).
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//
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// The iterator is expected to only work on a single-column table, and the
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// column must be given to the iterator constructor.
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class FakeIntegerIterator final : public TableRowIterator {
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public:
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FakeIntegerIterator(THD *thd, TABLE *table, Field_long *field,
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std::vector<int> dataset)
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: TableRowIterator(thd, table),
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m_field(field),
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m_dataset(move(dataset)) {}
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bool Init() override {
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m_current_index = 0;
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return false;
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}
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int Read() override {
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if (m_current_index == m_dataset.size()) {
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return -1;
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}
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m_field->store(m_dataset[m_current_index++], /* is_unsigned */ false);
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return 0;
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}
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std::vector<std::string> DebugString() const override {
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return {"Fake integer iterator"};
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}
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private:
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size_t m_current_index{0};
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Field_long *m_field;
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std::vector<int> m_dataset;
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};
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#endif // UNITTEST_GUNIT_FAKE_INTEGER_ITERATOR_H_
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