1 | from asap._asap import selector as _selector
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2 | from asap import unique, _to_list
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3 |
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4 | class selector(_selector):
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5 | """
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6 | A selection object to be applied to scantables to restrict the
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7 | scantables to specific rows.
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8 | """
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9 | def __init(self):
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10 | _selector.__init__(self)
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11 |
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12 | def reset(self):
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13 | """
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14 | Unset all selections.
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15 | """
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16 | self._reset()
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17 |
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18 | def is_empty(self):
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19 | """
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20 | Has anything been set?
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21 | """
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22 | return self._empty()
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23 |
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24 | def set_polarisations(self, pols=[]):
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25 | """
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26 | Set the polarisations to be selected in the scantable.
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27 | Parameters:
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28 | pols: a list of integers of 0-3, or strings, e.g ["I","Q"].
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29 | Default [] is no selection
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30 | Example:
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31 | sel = selector()
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32 | # These are equivalent if data is 'linear'
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33 | sel.set_polarisations(["XX","Re(XY)"])
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34 | sel.set_polarisations([0,2])
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35 | # reset the polarisation selection
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36 | sel.set_polarisations()
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37 |
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38 | """
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39 | vec = _to_list(pols, str) or _to_list(pols, int)
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40 | if isinstance(vec, list): # is an empty and/or valid vector
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41 | if len(vec) and isinstance(vec[-1],str):
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42 | self._setpolstrings(vec)
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43 | return
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44 | self._setpols(vec)
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45 | else:
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46 | raise TypeError('Unknown pol type. Please use [0,1...] or ["XX","YY"...]')
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47 |
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48 | # for the americans
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49 | set_polarizations = set_polarisations
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50 | # for the lazy
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51 | set_pols = set_polarisations
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52 |
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53 | def set_ifs(self, ifs=[]):
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54 | """
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55 | Set a sequence of IF numbers (0-based).
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56 | Parameters:
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57 | ifs: a list of integers. Default [] is to unset the selection.
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58 | """
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59 | vec = _to_list(ifs, int)
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60 | if isinstance(vec,list):
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61 | self._setifs(vec)
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62 | else:
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63 | raise TypeError('Unknown IFno type. Use lists of integers.')
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64 |
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65 | def set_scans(self, scans=[]):
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66 | """
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67 | Set a sequence of Scan numbers (0-based).
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68 | Parameters:
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69 | scans: a list of integers. Default [] is to unset the selection.
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70 | """
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71 | vec = _to_list(scans, int)
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72 | if isinstance(vec,list):
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73 | self._setscans(vec)
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74 | else:
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75 | raise TypeError('Unknown Scan number type. Use lists of integers.')
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76 |
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77 | def set_beams(self, beams=[]):
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78 | """
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79 | Set a sequence of Beam numbers (0-based).
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80 | Parameters:
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81 | beams: a list of integers. Default [] is to unset the selection.
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82 | """
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83 | vec = _to_list(beams, int)
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84 | if isinstance(vec,list):
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85 | self._setbeams(vec)
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86 | else:
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87 | raise TypeError('Unknown Beam number type. Use lists of integers.')
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88 |
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89 | def set_cycles(self, cycles=[]):
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90 | """
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91 | Set a sequence of IF numbers (0-based).
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92 | Parameters:
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93 | cycless: a list of integers. Default [] is to unset the selection.
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94 | """
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95 | vec = _to_list(cycles, int)
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96 | if isinstance(vec,list):
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97 | self._setcycles(vec)
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98 | else:
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99 | raise TypeError('Unknown Cycle number type. Use lists of integers.')
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100 |
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101 |
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102 | def set_name(self, name):
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103 | """
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104 | Set a selection based on a name. This can be a unix pattern , e.g. "*_R"
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105 | Parameters:
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106 | name: a string containing a source name or pattern
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107 | Examples:
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108 | # select all reference scans which start with "Orion"
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109 | selection.set_name("Orion*_R")
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110 | """
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111 | if isinstance(name, str):
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112 | self._setname(name)
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113 | else:
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114 | raise TypeError('name must be a string')
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115 |
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116 | def set_tsys(self, tsysmin=0.0, tsysmax=None):
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117 | """
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118 | Select by Tsys range.
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119 | Parameters:
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120 | tsysmin: the lower threshold. Default 0.0
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121 | tsysmax: the upper threshold. Default None.
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122 | Examples:
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123 | # select all spectra with Tsys <= 500.0
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124 | selection.set_tsys(tsysmax=500.0)
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125 |
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126 | """
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127 | taql = "SELECT FROM $1 WHERE TSYS[0] >= %f" % (tsysmin)
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128 | if isinstance(tsysmax, float):
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129 | taql = taql + " AND TSYS[0] <= %f" % ( tsysmax)
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130 | self._settaql(taql)
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131 |
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132 | def set_query(self, query):
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133 | """
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134 | Select by Column query. Power users only!
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135 | Example:
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136 | # select all off scans with integration times over 60 seconds.
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137 | selection.set_query("SRCTYPE == 1 AND INTERVAL > 60.0")
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138 | """
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139 | taql = "SELECT FROM $1 WHERE " + query
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140 | self._settaql(taql)
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141 |
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142 | def set_order(self, order):
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143 | """
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144 | Set the order the scantable should be sorted by.
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145 | Parameters:
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146 | order: The list of column names to sort by in order
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147 | """
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148 | self._setorder(order)
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149 |
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150 | def get_scans(self):
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151 | return list(self._getscans())
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152 | def get_cycles(self):
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153 | return list(self._getcycles())
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154 | def get_beams(self):
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155 | return list(self._getbeams())
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156 | def get_ifs(self):
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157 | return list(self._getifs())
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158 | def get_pols(self):
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159 | return list(self._getpols())
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160 | def get_poltypes(self):
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161 | return list(self._getpoltypes())
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162 | def get_order(self):
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163 | return list(self._getorder())
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164 | def get_query(self):
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165 | prefix = "SELECT FROM $1 WHERE "
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166 | return self._gettaql().replace(prefix, "")
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167 |
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168 | def get_name(self):
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169 | print "NYI"
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170 | s = self._gettaql()
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171 | return
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172 | def __str__(self):
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173 | out = ""
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174 | d = {"SCANNO": self.get_scans(),
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175 | "CYCLENO": self.get_cycles(),
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176 | "BEAMNO": self.get_beams(),
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177 | "IFNO": self.get_ifs(),
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178 | "Pol Type": self.get_poltypes(),
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179 | "POLNO": self.get_pols(),
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180 | "QUERY": self.get_query(),
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181 | "Sort Order": self.get_order()
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182 | }
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183 | for k,v in d.iteritems():
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184 | if v:
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185 | out += "%s: %s\n" % (k, v)
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186 | if len(out):
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187 | return out[:-1]
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188 | else:
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189 | return out
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190 | def __add__(self, other):
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191 | """
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192 | Merge two selections.
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193 | """
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194 | union = selector()
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195 | gets = [[self._getscans(), other._getscans(), union._setscans],
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196 | [self._getcycles(), other._getcycles(),union._setcycles],
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197 | [self._getbeams(), other._getbeams(), union._setbeams],
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198 | [self._getifs(), other._getifs(), union._setifs],
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199 | [self._getpols(), other._getpols(), union._setpols]]
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200 | for v in gets:
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201 | vec = list(v[0]+v[1])
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202 | vec.sort()
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203 | v[2](unique(vec))
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204 | q = other.get_query()
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205 | qs = self.get_query()
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206 | if len(q) and len(qs):
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207 | union.set_query(qs +" AND " + q)
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208 | else:
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209 | if len(q):
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210 | union.set_query(q)
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211 | elif len(qs):
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212 | union.set_query(qs)
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213 | return union
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