/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/table.py
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revision 1019 by jan, Fri May 23 12:56:34 2003 UTC revision 1078 by bh, Wed May 28 09:07:30 2003 UTC
# Line 2  Line 2 
2  # Authors:  # Authors:
3  # Bernhard Herzog <[email protected]>  # Bernhard Herzog <[email protected]>
4  # Jan-Oliver Wagner <[email protected]>  # Jan-Oliver Wagner <[email protected]>
5    # Frank Koormann <[email protected]>
6  #  #
7  # This program is free software under the GPL (>=v2)  # This program is free software under the GPL (>=v2)
8  # Read the file COPYING coming with Thuban for details.  # Read the file COPYING coming with Thuban for details.
# Line 132  class DBFTable(TitledObject, OldTableInt Line 133  class DBFTable(TitledObject, OldTableInt
133    
134      def __init__(self, filename):      def __init__(self, filename):
135          self.filename = filename          self.filename = filename
136          title = os.path.basename(self.filename)  
137            # Omit the extension in the title as it's not really needed and
138            # it can be confusing because dbflib removes extensions and
139            # appends some variations of '.dbf' before it tries to open the
140            # file. So the title could be e.g. myshapefile.shp when the real
141            # filename is myshapefile.dbf
142            title = os.path.splitext(os.path.basename(self.filename))[0]
143          TitledObject.__init__(self, title)          TitledObject.__init__(self, title)
144    
145          self.dbf = dbflib.DBFFile(filename)          self.dbf = dbflib.DBFFile(filename)
146    
147          # If true, self.dbf is open for writing.          # If true, self.dbf is open for writing.
# Line 229  class DBFTable(TitledObject, OldTableInt Line 237  class DBFTable(TitledObject, OldTableInt
237    
238      # DBF specific interface parts.      # DBF specific interface parts.
239    
240        def Width(self, col):
241            """Return column width"""
242            return self.column_map[col].width
243    
244      def Destroy(self):      def Destroy(self):
245          self.dbf.close()          self.dbf.close()
246          self.dbf = None          self.dbf = None
# Line 346  class MemoryTable(TitledObject, OldTable Line 358  class MemoryTable(TitledObject, OldTable
358          return min(values), max(values)          return min(values), max(values)
359    
360      def UniqueValues(self, col):      def UniqueValues(self, col):
361          """Return a sorted list of all unique values in the column col"""          """Return a sorted list of all unique values in the column col
362    
363            col can be either column index or name.
364            """
365          dict = {}          dict = {}
366    
367          for i in range(self.NumRows()):          for i in range(self.NumRows()):
# Line 357  class MemoryTable(TitledObject, OldTable Line 372  class MemoryTable(TitledObject, OldTable
372          values.sort()          values.sort()
373          return values          return values
374    
375        def Width(self, col):
376            """Return the maximum width of values in the column
377    
378            The return value is the the maximum length of string
379            representation of the values in the column (represented by index
380            or name).
381            """
382            max = 0
383    
384            type  = self.column_map[col].type
385            index = self.column_map[col].index
386            values = [row[index] for row in self.data]
387            if not values:
388                return None
389    
390            if type == FIELDTYPE_DOUBLE:
391                format = "%.12f"
392            elif type == FIELDTYPE_INT:
393                format = "%d"
394            else:
395                format = "%s"
396            for value in values:
397                l = len(format % value)
398                if l > max:
399                    max = l
400    
401            return max
402    
403      def Dependencies(self):      def Dependencies(self):
404          """Return an empty sequence. The MemoryTable doesn't depend on anything          """Return an empty sequence. The MemoryTable doesn't depend on anything
405          """          """
# Line 368  class MemoryTable(TitledObject, OldTable Line 411  class MemoryTable(TitledObject, OldTable
411          # TODO: Allow values to be a dictionary and write the single          # TODO: Allow values to be a dictionary and write the single
412          # fields that are specified.          # fields that are specified.
413          self.data[record] = values          self.data[record] = values
414    
415    
416    def table_to_dbf(table, filename):
417        """Create the dbf file filename from the table"""
418        dbf = dbflib.create(filename)
419    
420        dbflib_fieldtypes = {FIELDTYPE_STRING: dbflib.FTString,
421                             FIELDTYPE_INT: dbflib.FTInteger,
422                             FIELDTYPE_DOUBLE: dbflib.FTDouble}
423    
424        # Initialise the header. Distinguish between DBFTable and others.
425        for col in table.Columns():
426            width = table.Width(col.name)
427            if col.type == FIELDTYPE_DOUBLE:
428                prec = getattr(col, "prec", 12)
429            else:
430                prec = 0
431            dbf.add_field(col.name, dbflib_fieldtypes[col.type], width, prec)
432    
433        for i in range(table.NumRows()):
434            record = table.ReadRowAsDict(i)
435            dbf.write_record(i, record)
436        dbf.close()
437    
438    def table_to_csv(table, filename):
439        """Export table to csv file."""
440    
441        file = open(filename,"w")
442        columns = table.Columns()
443        if columns:
444            header = "#%s" % columns[0].name
445            for col in columns[1:]:
446                header = header + ",%s" % col.name
447            header = header + "\n"
448            file.write(header)
449    
450            for i in range(table.NumRows()):
451                record = table.ReadRowAsDict(i)
452                if len(record):
453                    line = "%s" % record[columns[0].name]
454                    for col in columns[1:]:
455                        line = line + ",%s" % record[col.name]
456                line = line + "\n"
457                file.write(line)
458        file.close()
459    
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