| 1 | #!/usr/bin/python -itt
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| 2 | import numpy as np
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| 3 | import pprint
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| 4 | import ctypes
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| 5 |
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| 6 | from ROOT import gSystem
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| 7 | gSystem.Load('pyfits_h.so')
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| 8 | from ROOT import *
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| 9 |
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| 10 | class FactFits( fits ):
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| 11 | """ -Fact Fits File-
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| 12 | A Python wrapper for the fits-class implemented in pyfits.h
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| 13 | provides easy access to the fits file meta data.
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| 14 | * dictionary of file metadata - self.meta
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| 15 | * dict of table metadata - self.columns
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| 16 | * variable table column access, thus possibly increased speed while looping
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| 17 | """
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| 18 | def __init__(self, path):
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| 19 | """ creates meta and columns dictionaries
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| 20 | """
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| 21 | self.path = path
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| 22 | try:
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| 23 | fits.__init__(self,path)
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| 24 | except IOError:
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| 25 | print 'problem accessing data file: ', data_file_name
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| 26 | raise # stop ! no data
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| 27 |
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| 28 | self.meta = self._make_meta_dict()
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| 29 | self.columns = self._make_columns_dict()
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| 30 |
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| 31 | self.treat_meta_dict()
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| 32 |
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| 33 |
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| 34 | # list of columns, which are already registered
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| 35 | # see method register()
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| 36 | self._registered_cols = []
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| 37 | # dict of column data, this is used, in order to be able to remove
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| 38 | # the ctypes of
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| 39 | self._table_cols = {}
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| 40 |
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| 41 | # I need to count the rows, since the normal loop mechanism seems not to work.
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| 42 | self._current_row = 0
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| 43 |
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| 44 | self.stacked_cols = {}
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| 45 |
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| 46 | def _make_meta_dict(self):
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| 47 | # intermediate variables for file metadata dict generation
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| 48 | keys=self.GetPy_KeyKeys()
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| 49 | values=self.GetPy_KeyValues()
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| 50 | comments=self.GetPy_KeyComments()
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| 51 | types=self.GetPy_KeyTypes()
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| 52 |
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| 53 | if len(keys) != len(values):
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| 54 | raise TypeError('len(keys)',len(keys),' != len(values)', len(values))
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| 55 | if len(keys) != len(types):
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| 56 | raise TypeError('len(keys)',len(keys),' != len(types)', len(types))
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| 57 | if len(keys) != len(comments):
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| 58 | raise TypeError('len(keys)',len(keys),' != len(comments)', len(comments))
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| 59 |
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| 60 | meta_dict = {}
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| 61 | for i in range(len(keys)):
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| 62 | type = types[i]
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| 63 | if type == 'I':
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| 64 | value = int(values[i])
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| 65 | elif type == 'F':
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| 66 | value = float(values[i])
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| 67 | elif type == 'B':
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| 68 | if values[i] == 'T':
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| 69 | value = True
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| 70 | elif values[i] == 'F':
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| 71 | value = False
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| 72 | else:
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| 73 | raise TypeError("meta-type is 'B', but meta-value is neither 'T' nor 'F'. meta-value:",values[i])
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| 74 | elif type == 'T':
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| 75 | value = values[i]
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| 76 | else:
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| 77 | raise TypeError("unknown meta-type: known meta types are: I,F,B and T. meta-type:",type)
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| 78 | meta_dict[keys[i]]=(value, comments[i])
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| 79 | return meta_dict
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| 80 |
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| 81 |
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| 82 | def _make_columns_dict(self):
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| 83 | # intermediate variables for file table-metadata dict generation
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| 84 | keys=self.GetPy_ColumnKeys()
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| 85 | #offsets=self.GetPy_ColumnOffsets() #not needed on python level...
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| 86 | nums=self.GetPy_ColumnNums()
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| 87 | sizes=self.GetPy_ColumnSizes()
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| 88 | types=self.GetPy_ColumnTypes()
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| 89 | units=self.GetPy_ColumnUnits()
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| 90 |
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| 91 | # zip the values
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| 92 | values = zip(nums,sizes,types,units)
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| 93 | # create the columns dictionary
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| 94 | columns = dict(zip(keys ,values))
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| 95 | return columns
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| 96 |
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| 97 | def stack(self, on=True):
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| 98 | self.next()
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| 99 | for col in self._registered_cols:
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| 100 | if isinstance( self.dict[col], type(np.array('')) ):
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| 101 | self.stacked_cols[col] = self.dict[col]
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| 102 | else:
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| 103 | # elif isinstance(self.dict[col], ctypes._SimpleCData):
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| 104 | self.stacked_cols[col] = np.array(self.dict[col])
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| 105 | # else:
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| 106 | # raise TypeError("I don't know how to stack "+col+". It is of type: "+str(type(self.dict[col])))
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| 107 |
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| 108 | def register(self, input_str):
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| 109 | columns = self.columns
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| 110 | if input_str.lower() == 'all':
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| 111 | for col in columns:
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| 112 | self._register(col)
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| 113 | else:
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| 114 | #check if colname is in columns:
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| 115 | if input_str not in columns:
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| 116 | error_msg = 'colname:'+ input_str +' is not a column in the binary table.\n'
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| 117 | error_msg+= 'possible colnames are\n'
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| 118 | for key in columns:
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| 119 | error_msg += key+'\n'
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| 120 | raise KeyError(error_msg)
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| 121 | else:
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| 122 | self._register(input_str)
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| 123 |
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| 124 | # 'private' method, do not use
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| 125 | def _register( self, colname):
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| 126 | columns = self.columns
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| 127 | local = None
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| 128 |
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| 129 | number_of_elements = int(columns[colname][0])
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| 130 | size_of_elements_in_bytes = int(columns[colname][1])
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| 131 | ctypecode_of_elements = columns[colname][2]
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| 132 | physical_unit_of_elements = columns[colname][3]
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| 133 |
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| 134 | # snippet from the C++ source code, or header file to be precise:
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| 135 | #case 'L': gLog << "bool(8)"; break;
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| 136 | #case 'B': gLog << "byte(8)"; break;
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| 137 | #case 'I': gLog << "short(16)"; break;
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| 138 | #case 'J': gLog << "int(32)"; break;
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| 139 | #case 'K': gLog << "int(64)"; break;
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| 140 | #case 'E': gLog << "float(32)"; break;
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| 141 | #case 'D': gLog << "double(64)"; break;
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| 142 |
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| 143 |
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| 144 |
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| 145 | # the fields inside the columns can either contain single numbers,
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| 146 | # or whole arrays of numbers as well.
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| 147 | # we treat single elements differently...
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| 148 | if number_of_elements == 1:
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| 149 | # allocate some memory for a single number according to its type
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| 150 | if ctypecode_of_elements == 'J': # J is for a 4byte int, i.e. an unsigned long
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| 151 | local = ctypes.c_ulong()
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| 152 | un_c_type = long
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| 153 | elif ctypecode_of_elements == 'I': # I is for a 2byte int, i.e. an unsinged int
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| 154 | local = ctypes.c_ushort()
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| 155 | un_c_type = int
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| 156 | elif ctypecode_of_elements == 'B': # B is for a byte
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| 157 | local = ctypes.c_ubyte()
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| 158 | un_c_type = int
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| 159 | elif ctypecode_of_elements == 'D':
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| 160 | local = ctypes.c_double()
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| 161 | un_c_type = float
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| 162 | elif ctypecode_of_elements == 'E':
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| 163 | local = ctypes.c_float()
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| 164 | un_c_type = float
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| 165 | elif ctypecode_of_elements == 'A':
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| 166 | local = ctypes.c_uchar()
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| 167 | un_c_type = chr
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| 168 | elif ctypecode_of_elements == 'K':
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| 169 | local = ctypes.c_ulonglong()
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| 170 | un_c_type = long
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| 171 | else:
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| 172 | raise TypeError('unknown ctypecode_of_elements:',ctypecode_of_elements)
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| 173 | else:
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| 174 | if ctypecode_of_elements == 'B': # B is for a byte
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| 175 | nptype = np.int8
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| 176 | elif ctypecode_of_elements == 'A': # A is for a char .. but I don't know how to handle it
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| 177 | nptype = np.int8
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| 178 | elif ctypecode_of_elements == 'I': # I is for a 2byte int
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| 179 | nptype = np.int16
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| 180 | elif ctypecode_of_elements == 'J': # J is for a 4byte int
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| 181 | nptype = np.int32
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| 182 | elif ctypecode_of_elements == 'K': # B is for a byte
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| 183 | nptype = np.int64
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| 184 | elif ctypecode_of_elements == 'E': # B is for a byte
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| 185 | nptype = np.float32
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| 186 | elif ctypecode_of_elements == 'D': # B is for a byte
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| 187 | nptype = np.float64
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| 188 | else:
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| 189 | raise TypeError('unknown ctypecode_of_elements:',ctypecode_of_elements)
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| 190 | local = np.zeros( number_of_elements, nptype)
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| 191 |
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| 192 | # Set the Pointer Address
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| 193 | self.SetPtrAddress(colname, local)
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| 194 | self._table_cols[colname] = local
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| 195 | if number_of_elements > 1:
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| 196 | self.__dict__[colname] = local
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| 197 | self.dict[colname] = local
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| 198 | else:
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| 199 | # remove any traces of ctypes:
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| 200 | self.__dict__[colname] = local.value
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| 201 | self.dict[colname] = local.value
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| 202 | self._registered_cols.append(colname)
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| 203 |
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| 204 | def treat_meta_dict(self):
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| 205 | """make 'interesting' meta information available like normal members.
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| 206 | non interesting are:
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| 207 | TFORM, TUNIT, and TTYPE
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| 208 | since these are available via the columns dict.
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| 209 | """
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| 210 |
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| 211 | self.number_of_rows = self.meta['NAXIS2'][0]
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| 212 | self.number_of_columns = self.meta['TFIELDS'][0]
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| 213 |
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| 214 | # there are some information in the meta dict, which are alsways there:
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| 215 | # there are regarded as not interesting:
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| 216 | uninteresting_meta = {}
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| 217 | uninteresting_meta['arraylike'] = {}
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| 218 | uninteresting = ['NAXIS', 'NAXIS1', 'NAXIS2',
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| 219 | 'TFIELDS',
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| 220 | 'XTENSION','EXTNAME','EXTREL',
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| 221 | 'BITPIX', 'PCOUNT', 'GCOUNT',
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| 222 | 'ORIGIN',
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| 223 | 'PACKAGE', 'COMPILED', 'CREATOR',
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| 224 | 'TELESCOP','TIMESYS','TIMEUNIT','VERSION']
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| 225 | for key in uninteresting:
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| 226 | if key in self.meta:
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| 227 | uninteresting_meta[key]=self.meta[key]
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| 228 | del self.meta[key]
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| 229 |
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| 230 | meta = self.meta
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| 231 | # loop over keys:
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| 232 | # * try to find array-like keys
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| 233 | arraylike = {}
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| 234 | singlelike = []
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| 235 | for key in self.meta:
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| 236 | stripped = key.rstrip('1234567890')
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| 237 | if stripped == key:
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| 238 | singlelike.append(key)
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| 239 | else:
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| 240 | if stripped not in arraylike:
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| 241 | arraylike[stripped] = 0
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| 242 | else:
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| 243 | arraylike[stripped] += 1
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| 244 | newmeta = {}
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| 245 | for key in singlelike:
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| 246 | newmeta[key.lower()] = meta[key]
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| 247 | for key in arraylike:
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| 248 | uninteresting_meta['arraylike'][key.lower()] = []
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| 249 | for i in range(arraylike[key]+1):
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| 250 | if key+str(i) in meta:
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| 251 | uninteresting_meta['arraylike'][key.lower()].append(meta[key+str(i)])
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| 252 | self.ui_meta = uninteresting_meta
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| 253 | # make newmeta self
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| 254 | for key in newmeta:
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| 255 | self.__dict__[key]=newmeta[key]
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| 256 |
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| 257 | dict = self.__dict__.copy()
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| 258 | del dict['meta']
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| 259 | del dict['ui_meta']
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| 260 | self.dict = dict
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| 261 |
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| 262 | def __iter__(self):
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| 263 | """ iterator """
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| 264 | return self
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| 265 |
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| 266 | def next(self):
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| 267 | """ used by __iter__ """
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| 268 | # Here one might check, if looping makes any sense, and if not
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| 269 | # one could stop looping or so...
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| 270 | # like this:
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| 271 | #
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| 272 | # if len(self._registered_cols) == 0:
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| 273 | # print 'warning: looping without any registered columns'
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| 274 | if self._current_row < self.number_of_rows:
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| 275 | if self.GetNextRow() == False:
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| 276 | raise StopIteration
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| 277 | for col in self._registered_cols:
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| 278 | if isinstance(self._table_cols[col], ctypes._SimpleCData):
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| 279 | self.__dict__[col] = self._table_cols[col].value
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| 280 | self.dict[col] = self._table_cols[col].value
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| 281 |
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| 282 | for col in self.stacked_cols:
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| 283 | if isinstance(self.dict[col], type(np.array(''))):
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| 284 | self.stacked_cols[col] = np.vstack( (self.stacked_cols[col],self.dict[col]) )
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| 285 | else:
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| 286 | # elif isinstance(self.dict[col], ctypes._SimpleCData):
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| 287 | self.stacked_cols[col] = np.vstack( (self.stacked_cols[col],np.array(self.dict[col])) )
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| 288 | #else:
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| 289 | #raise TypeError("I don't know how to stack "+col+". It is of type: "+str(type(self.dict[col])))
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| 290 |
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| 291 |
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| 292 |
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| 293 |
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| 294 | self._current_row += 1
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| 295 | else:
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| 296 | raise StopIteration
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| 297 | return self
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| 298 |
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| 299 | def show(self):
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| 300 | pprint.pprint(self.dict)
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| 301 |
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| 302 | if __name__ == '__main__':
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| 303 | import sys
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| 304 | if len(sys.argv) == 1:
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| 305 | print 'usage:', sys.argv[0], 'fits-file-name'
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| 306 |
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| 307 | file = FactFits(sys.argv[1])
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| 308 | print '-'*70
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| 309 | print "opened :", sys.argv[1], " as 'file'"
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| 310 | print
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| 311 | print '-'*70
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| 312 | print 'type file.show() to look at its contents'
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| 313 | print "type file.register( columnname ) or file.register('all') in order to register columns"
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| 314 | print
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| 315 | print " due column-registration you declare, that you would like to retrieve the contents of one of the columns"
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| 316 | print " after column-registration, the 'file' has new member variables, they are named like the columns"
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| 317 | print " PLEASE NOTE: immediatly after registration, the members exist, but they are empty."
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| 318 | print " the values are assigned only, when you call file.next() or when you loop over the 'file'"
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| 319 | print
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| 320 | print "in order to loop over it, just go like this:"
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| 321 | print "for row in file:"
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| 322 | print " print row.columnname_one, row.columnname_two"
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| 323 | print
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| 324 | print ""
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| 325 | print '-'*70
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| 326 | |
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