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  • Committer: Brian Aker
  • Date: 2009-08-15 00:59:30 UTC
  • mfrom: (1115.1.7 merge)
  • Revision ID: brian@gaz-20090815005930-q47yenjrq1esiwsz
Merge of Trond + Brian

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plugin/function_engine/function.cc
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/* - mode: c; c-basic-offset: 2; indent-tabs-mode: nil; -*-
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 *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
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 *
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 *  Copyright (C) 2010 Sun Microsystems
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 *
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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 as published by
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 *  the Free Software Foundation; either version 2 of the License, or
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 *  (at your option) any later version.
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 *
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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 for more details.
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 *
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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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#include "config.h"
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#include <plugin/function_engine/function.h>
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#include <plugin/function_engine/cursor.h>
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#include <string>
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using namespace std;
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using namespace drizzled;
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static SchemaIdentifier INFORMATION_SCHEMA_IDENTIFIER("INFORMATION_SCHEMA");
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static SchemaIdentifier DATA_DICTIONARY_IDENTIFIER("DATA_DICTIONARY");
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Function::Function(const std::string &name_arg) :
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  drizzled::plugin::StorageEngine(name_arg,
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                                  HTON_ALTER_NOT_SUPPORTED |
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                                  HTON_HAS_SCHEMA_DICTIONARY |
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                                  HTON_SKIP_STORE_LOCK |
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                                  HTON_TEMPORARY_NOT_SUPPORTED)
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{
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}
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Cursor *Function::create(TableShare &table, memory::Root *mem_root)
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{
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  return new (mem_root) FunctionCursor(*this, table);
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}
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int Function::doGetTableDefinition(Session &,
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                                   TableIdentifier &identifier,
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                                   message::Table &table_proto)
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{
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  string tab_name(identifier.getPath());
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  transform(tab_name.begin(), tab_name.end(),
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            tab_name.begin(), ::tolower);
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  drizzled::plugin::TableFunction *function= getFunction(tab_name);
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  if (not function)
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  {
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    return ENOENT;
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  }
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  function->define(table_proto);
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  return EEXIST;
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}
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void Function::doGetTableNames(drizzled::CachedDirectory&, 
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                               drizzled::SchemaIdentifier &schema_identifier,
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                               set<string> &set_of_names)
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{
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  drizzled::plugin::TableFunction::getNames(schema_identifier.getSchemaName(), set_of_names);
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}
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void Function::doGetSchemaIdentifiers(SchemaIdentifierList& schemas)
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{
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  schemas.push_back(INFORMATION_SCHEMA_IDENTIFIER);
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  schemas.push_back(DATA_DICTIONARY_IDENTIFIER);
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}
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bool Function::doGetSchemaDefinition(SchemaIdentifier &schema_identifier, message::Schema &schema_message)
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{
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  if (schema_identifier == INFORMATION_SCHEMA_IDENTIFIER)
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  {
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    schema_message.set_name("information_schema");
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    schema_message.set_collation("utf8_general_ci");
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  }
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  else if (schema_identifier == DATA_DICTIONARY_IDENTIFIER)
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  {
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    schema_message.set_name("data_dictionary");
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    schema_message.set_collation("utf8_general_ci");
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  }
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  else
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  {
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    return false;
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  }
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  return true;
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}
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bool Function::doCanCreateTable(drizzled::TableIdentifier &table_identifier)
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{
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  if (static_cast<SchemaIdentifier&>(table_identifier) == INFORMATION_SCHEMA_IDENTIFIER)
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  {
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    return false;
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  }
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  else if (static_cast<SchemaIdentifier&>(table_identifier) == DATA_DICTIONARY_IDENTIFIER)
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  {
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    return false;
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  }
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  return true;
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}
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bool Function::doDoesTableExist(Session&, TableIdentifier &identifier)
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{
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  drizzled::plugin::TableFunction *function= getFunction(identifier.getPath());
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  if (function)
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    return true;
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  return false;
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}
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void Function::doGetTableIdentifiers(drizzled::CachedDirectory&,
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                                     drizzled::SchemaIdentifier &schema_identifier,
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                                     drizzled::TableIdentifiers &set_of_identifiers)
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{
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  set<string> set_of_names;
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  drizzled::plugin::TableFunction::getNames(schema_identifier.getSchemaName(), set_of_names);
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  for (set<string>::iterator iter= set_of_names.begin(); iter != set_of_names.end(); iter++)
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  {
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    set_of_identifiers.push_back(TableIdentifier(schema_identifier, *iter));
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  }
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}
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static int init(drizzled::plugin::Context &context)
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{
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  context.add(new Function("FunctionEngine"));
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  return 0;
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}
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DRIZZLE_DECLARE_PLUGIN
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{
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  DRIZZLE_VERSION_ID,
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  "FunctionEngine",
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  "1.0",
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  "Brian Aker",
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  "Function Engine provides the infrastructure for Table Functions,etc.",
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  PLUGIN_LICENSE_GPL,
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  init,     /* Plugin Init */
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  NULL,               /* system variables */
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  NULL                /* config options   */
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}
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DRIZZLE_DECLARE_PLUGIN_END;