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# Copyright 2002-2004 CherryPy Team (team@cherrypy.org)
#
# 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; either version 2, or (at your option)
# any later version.
#
# 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., 59 Temple Place - Suite 330, Boston, MA
# 02111-1307, USA.
#
# As a special exception, the CherryPy team gives unlimited permission to
# copy, distribute and modify the CherryPy scripts that are the
# output of CherryPy. You need not follow the terms of the GNU
# General Public License when using or distributing such scripts, even
# though portions of the text of CherryPy appear in them. The GNU
# General Public License (GPL) does govern all other use of the
# material that constitutes the CherryPy program.
#
# Certain portions of the CherryPy source text are designed to be
# copied (in certain cases, depending on the input) into the output of
# CherryPy. We call these the "data" portions. The rest of the
# CherryPY source text consists of comments plus executable code that
# decides which of the data portions to output in any given case. We
# call these comments and executable code the "non-data" portions.
# CherryPy never copies any of the non-data portions into its output.
#
# This special exception to the GPL applies to versions of CherryPy
# released by the CherryPy team. When you make and distribute a modified
# version of CherryPy, you may extend this special exception to the
# GPL to apply to your modified version as well, *unless* your
# modified version has the potential to copy into its output some of
# the text that was the non-data portion of the version that you
# started with. (In other words, unless your change moves or copies
# text from the non-data portions to the data portions.) If your
# modification has such potential, you must delete any notice of this
# special exception to the GPL from your modified version.
#############################################
#
# WARNING: This module was experimental code and
# is not longer maintained or used (except
# in the Prestation demo)
#
# DO NOT USE IT FOR REAL STUFF
#
#############################################
import types
def initServer():
# We have to put this in initServer, because all the tables have to be instantiated before we read the database file
cherryDb.databaseRead()
######################
CherryClass CherryDb:
######################
function:
def databaseWrite(self, table, action, where, kw):
f=open('database','a')
param=","
if where!=None: param+="%s,"%`where`
for key, value in kw.items():
if key!='_id': param+="%s=%s,"%(key, `value`)
param+="_rd=1,"
f.write('%s.%s(%s)\n'%(table, action, param[1:-1]))
f.close()
def databaseRead(self):
try:
f=open(configFile.get('prestationDatabase','file'),'r')
logMessage("Reading gaz station database for the Prestation demo ...")
data=f.read()
f.close()
except:
logMessage("No database found")
return
data=data.replace('\r\n','\n')
lines=data.split('\n')
i=0
while i<len(lines):
cmd=lines[i]
if not cmd: break
if cmd[-1]!=')': logMessage("Warning, database file is corrupt line %s (last char:%s)"%(i,`cmd[-1]`))
else: exec(cmd)
i+=1
logMessage("Done reading database")
# Function to get an item from its representation
def getInstanceItem(self, instanceItem):
i=instanceItem.rfind("_")
table=instanceItem[10:i]
id=instanceItem[i+1:]
instanceList=eval(table+".getItem('item._id=='+id)")
return instanceList[0]
def getToken(self, str):
if str[0]=='"':
end=findClosingQuote(str, '"', 1)
return str[:end+1]
elif str[0]=='"':
end=findClosingQuote(str, "'", 1)
return str[:end+1]
else:
j=str.find(" ")
if j==-1: j=len(str)
k=str.find(")")
if k==-1: k=len(str)
i=min([j,k])
return str[:i]
######################
CherryClass CherryDbItem abstract:
######################
function:
def __init__(self, _id, _tableName):
self._id=_id
self._tableName=_tableName
def __repr__(self):
return '"_instance_%s_%s"'%(self._tableName, self._id)
######################
CherryClass CherryTable abstract:
######################
aspect:
method.name=='__init__' start:
self._id=0
self._itemList=[]
self._indexMap={}
self.column=[]
self.specialColumn=[]
self.index=[]
self.specialIndex=[]
self._tableName=self.__class__.__name__
self._tableName=self._tableName[0].lower()+self._tableName[1:]
method.name=='__init__' end:
self.index.append('_id')
for index in self.index:
self._indexMap[index]={}
for index in self.specialIndex:
value, as=index.split(" as ")
self._indexMap[as]={}
function:
def addItem(self, **kw):
if kw.has_key("_id"):
_id=kw["_id"]
if _id>self._id: self._id=_id
else:
self._id+=1
_id=self._id
# Check for "_instance_"
for _key, _value in kw.items():
if type(_value)==types.StringType and _value[:10]=="_instance_":
instance=cherryDb.getInstanceItem(_value)
kw[_key]=instance
item=CherryDbItem(self._id, self._tableName)
if not kw.has_key("_rd"): cherryDb.databaseWrite(item._tableName, "addItem", None, kw)
self._itemList.append(item)
# Add columns, special columns and index item
for column in self.column:
if kw.has_key(column): exec("item.%s=kw[column]"%column)
else: exec("item.%s=None"%column)
for specialColumn in self.specialColumn:
_valueStr, as=specialColumn.split(" as ")
_value=eval(_valueStr)
exec("item.%s=_value"%as)
self._indexItem(item)
return item
def getItem(self, where="", sortBy="", order="asc", firstValueList=[], lastValueList=[None]):
# Work on where clause: replace all occurences of "instance_table_id" with actual item
tmpInstanceList=[]
tmpInstanceId=0
while 1:
i=where.find('"_instance_')
if i==-1: break
k=where.find('"', i+1)
tmpInstance=cherryDb.getInstanceItem(where[i+1:k])
tmpInstanceList.append(tmpInstance)
where=where[:i]+"tmpInstanceList[%s]"%tmpInstanceId+where[k+1:]
tmpInstanceId+=1
# Check for indexes (only if "or" and "not" are not used
itemLoopList=self._itemList
if where.find(" or ")==-1 and where.find(" not ")==-1:
for index in self.index+self.specialIndex:
# Check if it's a special index
sp=index.split(" as ")
if len(sp)==2: index=sp[1]
i=where.find("item.%s=="%index)
if i!=-1:
token=cherryDb.getToken(where[i+7+len(index):])
value=eval(token)
if not self._indexMap[index].has_key(value): return []
itemLoopList=self._indexMap[index][value]
where=where[:i]+where[i+7+len(index)+len(token):]
if not where: return itemLoopList
res=[]
for item in itemLoopList:
if eval(where): res.append(item)
if sortBy:
# Sort results
tmpRes, firstValueRes, lastValueRes=[], [], []
for item in res:
field=eval("item.%s"%sortBy)
if field in firstValueList: firstValueRes.append(item)
if field in lastValueList: lastValueRes.append(item)
else: tmpRes.append((field, item))
tmpRes.sort()
if order=="desc": tmpRes.reverse()
res=firstValueRes
for field, item in tmpRes: res.append(item)
res+=lastValueRes
return res
# Function to add item to indexes
def _indexItem(self, item):
for index in self.index:
value=eval("item.%s"%index)
if self._indexMap[index].has_key(value): self._indexMap[index][value].append(item)
else: self._indexMap[index][value]=[item]
for index in self.specialIndex:
valueStr, as=index.split(" as ")
value=eval(valueStr)
if type(value)!=types.ListType: value=[value]
for val in value:
if self._indexMap[as].has_key(val): self._indexMap[as][val].append(item)
else: self._indexMap[as][val]=[item]
# Function to remove item from indexes
def _unIndexItem(self, item):
for index in self.index:
value=eval("item.%s"%index)
self._indexMap[index][value].remove(item)
def deleteItem(self, whereOrItemList="", **kw):
itemList=self._getWhereOrItemList(whereOrItemList)[:]
if itemList:
for item in itemList:
self._itemList.remove(item)
self._unIndexItem(item)
if not kw.has_key("_rd"): cherryDb.databaseWrite(itemList[0]._tableName, "deleteItem", itemList, kw)
def updateItem(self, whereOrItemList="", **kw):
itemList=self._getWhereOrItemList(whereOrItemList)[:]
if itemList:
for item in itemList:
self._unIndexItem(item)
for _key in kw.keys():
exec('item.%s=kw["%s"]'%(_key,_key))
self._indexItem(item)
if not kw.has_key("_rd"): cherryDb.databaseWrite(itemList[0]._tableName, "updateItem", itemList, kw)
# Function to return a list of item for a given whereOrItemList
def _getWhereOrItemList(self, whereOrItemList):
if type(whereOrItemList)==types.StringType: return self.getItem(whereOrItemList)
else:
itemList=[]
for item in whereOrItemList:
if type(item)==types.StringType and item[:10]=="_instance_":
item=cherryDb.getInstanceItem(item)
itemList.append(item)
else: itemList.append(item)
return itemList
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