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ReadData.py 3.38 KiB
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'''
PrefixSpan Code written by: Debjit Pal
Email ID: dpal2@illinois.edu
Institute: University of Illinois at Urbana-Chmapaign
Paper: PrefixSpan: Mining Sequential Patterns Efficiently by Prefix-Projected Pattern Growth, Jian Pei, Jiawei Han
'''

from Constraints import *
from Item import *

class ReadData():
    def __init__(
           self,
           enabled = 1,
           ):
        self.enabled = enabled
    
    def ReadEventSequence(self, EventSeqFile):
        '''
        Returns a Sequence Database in a dictionary format where each entry in dictionary is
        of the format SID:Data
        '''
        SDB = {}
        SID = 1
        with open(EventSeqFile) as f:
            for line in f:
                elements = line.lstrip().rstrip().split(',')
                itemSet = []
                for e in elements:
                    Items_ = e.split()
                    for Item__ in Items_:
                        splits = Item__.split('@')
                        itemSet.append(Item(splits[0], splits[1]))
                SDB[SID] = itemSet
                SID = SID + 1
        return SDB

    def ReadConstraints(self, ConstraintFile):
        '''
        Reads Constraints and Creates instances of Constraints 
        '''
        ConstraintL = []
        ConstraintID = 1
        with open(ConstraintFile) as f:
            for line in f:
                if line[0] == '#':
                    continue
                elements = line.lstrip().rstrip().split('::')
                if elements[0].upper() == 'GAP':
                    # ID Type::Support::Items::Operators::Gap
                    Constraints_ = Constraints(ConstraintID, elements[0], elements[1], [], -1, elements[3], elements[2], -1, None)
                elif elements[0].upper() == 'DUR':
                    # ID Type::Support::Items::Operators::Duration
                    Constraints_ = Constraints(ConstraintID, elements[0], elements[1], [], elements[3], -1, elements[2], -1, None)
                elif elements[0] == 'IT':
                    Constraints_ = Constraints(ConstraintID, elements[0], elements[1], elements[2].split(','), -1, -1, elements[3], -1, None)
                elif elements[0] == 'RE':
                    Constraints_ = Constraints(ConstraintID, elements[0], elements[1], [], -1, -1, None, -1, elements[2])
                elif elements[0] == 'LEN':
                    Constraints_ = Constraints(ConstraintID, elements[0], elements[1], [], -1, -1, elements[2], elements[3], None)
                ConstraintL.append(Constraints_)
                ConstraintID = ConstraintID + 1

        print "Total Number of constraints specified: ", len(ConstraintL)
        return ConstraintL

    def PrintPatternInStringFormat(self, Pattern, Param):
        '''
        Take Patterns in List of Lists format and convert them to a String Format for easy understanding
        '''
        stringToPrint = '<' if Param else ''
        for element in Pattern:
            if len(element) == 1:
                stringToPrint = stringToPrint + element[0]
            else:
                stringToPrint = stringToPrint + '(' if Param else stringToPrint
                for item in element:
                    stringToPrint = stringToPrint + item
                stringToPrint = stringToPrint + ')' if Param else stringToPrint
        stringToPrint = stringToPrint + '>' if Param else stringToPrint
        return stringToPrint.rstrip().lstrip()