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