118 lines
3.2 KiB
C++
118 lines
3.2 KiB
C++
/*
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Copyright (c) 2017, 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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*/
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#ifndef NDB_MODIFIERS_H
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#define NDB_MODIFIERS_H
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#include "my_inttypes.h"
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/**
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* Support for create table/column modifiers
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* by exploiting the comment field
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*/
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struct NDB_Modifier {
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enum { M_BOOL, M_STRING } m_type;
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const char *m_name;
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size_t m_name_len;
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bool m_found;
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union {
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bool m_val_bool;
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struct {
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const char *str;
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size_t len;
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} m_val_str;
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};
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};
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/**
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* NDB_Modifiers
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*
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* This class implements a simple parser for getting modifiers out
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* of a string (e.g a comment field), allowing them to be modified
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* and then allowing the string to be regenerated with the
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* modified values
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*/
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class NDB_Modifiers {
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public:
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NDB_Modifiers(const char *prefix, const NDB_Modifier modifiers[]);
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~NDB_Modifiers();
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/**
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* Load comment, with length
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* (not necessailly a null terminated string
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* returns negative in case of errors,
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* details from getErrMsg()
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*/
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int loadComment(const char *str, size_t len);
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/**
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* Get modifier...returns NULL if unknown
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*/
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const NDB_Modifier *get(const char *name) const;
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/**
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* return a modifier which has m_found == false
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*/
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const NDB_Modifier *notfound() const;
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/**
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* Set value of modifier
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*/
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bool set(const char *name, bool value);
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bool set(const char *name, const char *string);
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/**
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* Generate comment string with current set modifiers
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* Returns null in case of errors,
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* details from getErrMsg()
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*/
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const char *generateCommentString();
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/**
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* Get error detail string
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*/
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const char *getErrMsg() const { return m_errmsg; }
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private:
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const char *m_prefix;
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uint32 m_prefixLen;
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uint m_len;
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struct NDB_Modifier *m_modifiers;
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char *m_comment_buf;
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uint32 m_comment_len;
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uint32 m_mod_start_offset;
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uint32 m_mod_len;
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char m_errmsg[100];
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NDB_Modifier *find(const char *name) const;
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int parse_modifier(struct NDB_Modifier *m, const char *str);
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int parseModifierListString(const char *string);
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uint32 generateModifierListString(char *buf, size_t buflen) const;
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};
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#endif
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