Current File : //usr/include/mysql/server/private/item_xmlfunc.h
#ifndef ITEM_XMLFUNC_INCLUDED
#define ITEM_XMLFUNC_INCLUDED
/* Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.
Copyright (c) 2009, 2019, MariaDB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
/* This file defines all XML functions */
typedef struct my_xml_node_st MY_XML_NODE;
/* Structure to store nodeset elements */
class MY_XPATH_FLT
{
public:
uint num; // Absolute position in MY_XML_NODE array
uint pos; // Relative position in context
uint size; // Context size
public:
MY_XPATH_FLT(uint32 num_arg, uint32 pos_arg)
:num(num_arg), pos(pos_arg), size(0)
{ }
MY_XPATH_FLT(uint32 num_arg, uint32 pos_arg, uint32 size_arg)
:num(num_arg), pos(pos_arg), size(size_arg)
{ }
bool append_to(Native *to) const
{
return to->append((const char*) this, (uint32) sizeof(*this));
}
};
class NativeNodesetBuffer: public NativeBuffer<16*sizeof(MY_XPATH_FLT)>
{
public:
const MY_XPATH_FLT &element(uint i) const
{
const MY_XPATH_FLT *p= (MY_XPATH_FLT*) (ptr() + i * sizeof(MY_XPATH_FLT));
return *p;
}
uint32 elements() const
{
return length() / sizeof(MY_XPATH_FLT);
}
};
class Item_xml_str_func: public Item_str_func
{
protected:
/*
A helper class to store raw and parsed XML.
*/
class XML
{
bool m_cached;
String *m_raw_ptr; // Pointer to text representation
String m_raw_buf; // Cached text representation
String m_parsed_buf; // Array of MY_XML_NODEs, pointing to raw_buffer
bool parse();
void reset()
{
m_cached= false;
m_raw_ptr= (String *) 0;
}
public:
XML() { reset(); }
void set_charset(CHARSET_INFO *cs) { m_parsed_buf.set_charset(cs); }
String *raw() { return m_raw_ptr; }
String *parsed() { return &m_parsed_buf; }
const MY_XML_NODE *node(uint idx);
bool cached() { return m_cached; }
bool parse(String *raw, bool cache);
bool parse(Item *item, bool cache)
{
String *res;
if (!(res= item->val_str(&m_raw_buf)))
{
m_raw_ptr= (String *) 0;
m_cached= cache;
return true;
}
return parse(res, cache);
}
};
String m_xpath_query; // XPath query text
Item *nodeset_func;
XML xml;
bool get_xml(XML *xml_arg, bool cache= false)
{
if (!cache && xml_arg->cached())
return xml_arg->raw() == 0;
return xml_arg->parse(args[0], cache);
}
public:
Item_xml_str_func(THD *thd, Item *a, Item *b): Item_str_func(thd, a, b)
{
set_maybe_null();
}
Item_xml_str_func(THD *thd, Item *a, Item *b, Item *c):
Item_str_func(thd, a, b, c)
{
set_maybe_null();
}
bool fix_fields(THD *thd, Item **ref) override;
bool fix_length_and_dec() override;
bool const_item() const override
{
return const_item_cache && (!nodeset_func || nodeset_func->const_item());
}
};
class Item_func_xml_extractvalue: public Item_xml_str_func
{
public:
Item_func_xml_extractvalue(THD *thd, Item *a, Item *b):
Item_xml_str_func(thd, a, b) {}
LEX_CSTRING func_name_cstring() const override
{
static LEX_CSTRING name= {STRING_WITH_LEN("extractvalue") };
return name;
}
String *val_str(String *) override;
Item *do_get_copy(THD *thd) const override
{ return get_item_copy<Item_func_xml_extractvalue>(thd, this); }
};
class Item_func_xml_update: public Item_xml_str_func
{
NativeNodesetBuffer tmp_native_value2;
String tmp_value3;
bool collect_result(String *str,
const MY_XML_NODE *cut,
const String *replace);
public:
Item_func_xml_update(THD *thd, Item *a, Item *b, Item *c):
Item_xml_str_func(thd, a, b, c) {}
LEX_CSTRING func_name_cstring() const override
{
static LEX_CSTRING name= {STRING_WITH_LEN("updatexml") };
return name;
}
String *val_str(String *) override;
Item *do_get_copy(THD *thd) const override
{ return get_item_copy<Item_func_xml_update>(thd, this); }
};
#endif /* ITEM_XMLFUNC_INCLUDED */
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