[932] | 1 | from asap._asap import selector as _selector |
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[948] | 2 | from asap import unique, _to_list |
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| 3 | |
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[932] | 4 | class selector(_selector): |
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[948] | 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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[932] | 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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[948] | 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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[932] | 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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[948] | 37 | |
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[932] | 38 | """ |
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[954] | 39 | vec = _to_list(pols, str) or _to_list(pols, int) |
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[1045] | 40 | if isinstance(vec, list): # is an empty and/or valid vector |
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[932] | 41 | if len(vec) and isinstance(vec[-1],str): |
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[954] | 42 | self._setpolstrings(vec) |
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[932] | 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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[1349] | 47 | |
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| 48 | # for the americans |
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| 49 | set_polarization = set_polarisations |
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[932] | 50 | |
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| 51 | def set_ifs(self, ifs=[]): |
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| 52 | """ |
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| 53 | Set a sequence of IF numbers (0-based). |
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| 54 | Parameters: |
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| 55 | ifs: a list of integers. Default [] is to unset the selection. |
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| 56 | """ |
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| 57 | vec = _to_list(ifs, int) |
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[1045] | 58 | if isinstance(vec,list): |
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[932] | 59 | self._setifs(vec) |
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| 60 | else: |
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| 61 | raise TypeError('Unknown IFno type. Use lists of integers.') |
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| 62 | |
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| 63 | def set_scans(self, scans=[]): |
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| 64 | """ |
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| 65 | Set a sequence of Scan numbers (0-based). |
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| 66 | Parameters: |
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| 67 | scans: a list of integers. Default [] is to unset the selection. |
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| 68 | """ |
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| 69 | vec = _to_list(scans, int) |
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[1045] | 70 | if isinstance(vec,list): |
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[932] | 71 | self._setscans(vec) |
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| 72 | else: |
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| 73 | raise TypeError('Unknown Scan number type. Use lists of integers.') |
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| 74 | |
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| 75 | def set_beams(self, beams=[]): |
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| 76 | """ |
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| 77 | Set a sequence of Beam numbers (0-based). |
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| 78 | Parameters: |
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| 79 | beams: a list of integers. Default [] is to unset the selection. |
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| 80 | """ |
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| 81 | vec = _to_list(beams, int) |
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[1045] | 82 | if isinstance(vec,list): |
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[932] | 83 | self._setbeams(vec) |
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| 84 | else: |
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| 85 | raise TypeError('Unknown Beam number type. Use lists of integers.') |
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| 86 | |
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| 87 | def set_cycles(self, cycles=[]): |
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| 88 | """ |
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| 89 | Set a sequence of IF numbers (0-based). |
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| 90 | Parameters: |
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| 91 | cycless: a list of integers. Default [] is to unset the selection. |
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| 92 | """ |
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| 93 | vec = _to_list(cycles, int) |
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[1045] | 94 | if isinstance(vec,list): |
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[932] | 95 | self._setcycles(vec) |
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| 96 | else: |
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| 97 | raise TypeError('Unknown Cycle number type. Use lists of integers.') |
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| 98 | |
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[948] | 99 | |
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[932] | 100 | def set_name(self, name): |
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| 101 | """ |
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| 102 | Set a selection based on a name. This can be a unix pattern , e.g. "*_R" |
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| 103 | Parameters: |
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| 104 | name: a string containing a source name or pattern |
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| 105 | Examples: |
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| 106 | # select all reference scans which start with "Orion" |
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| 107 | selection.set_name("Orion*_R") |
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| 108 | """ |
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| 109 | if isinstance(name, str): |
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[952] | 110 | self._setname(name) |
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[932] | 111 | else: |
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| 112 | raise TypeError('name must be a string') |
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[948] | 113 | |
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[932] | 114 | def set_tsys(self, tsysmin=0.0, tsysmax=None): |
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| 115 | """ |
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| 116 | Select by Tsys range. |
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| 117 | Parameters: |
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| 118 | tsysmin: the lower threshold. Default 0.0 |
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| 119 | tsysmax: the upper threshold. Default None. |
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| 120 | Examples: |
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| 121 | # select all spectra with Tsys <= 500.0 |
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| 122 | selection.set_tsys(tsysmax=500.0) |
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[948] | 123 | |
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[932] | 124 | """ |
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[963] | 125 | taql = "SELECT FROM $1 WHERE TSYS[0] >= %f" % (tsysmin) |
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[932] | 126 | if isinstance(tsysmax, float): |
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[963] | 127 | taql = taql + " AND TSYS[0] <= %f" % ( tsysmax) |
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[932] | 128 | self._settaql(taql) |
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| 129 | |
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| 130 | def set_query(self, query): |
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| 131 | """ |
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| 132 | Select by Column query. Power users only! |
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| 133 | Example: |
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| 134 | # select all off scans with integration times over 60 seconds. |
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| 135 | selection.set_query("SRCTYPE == 1 AND INTERVAL > 60.0") |
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| 136 | """ |
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| 137 | taql = "SELECT FROM $1 WHERE " + query |
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| 138 | self._settaql(taql) |
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[948] | 139 | |
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| 140 | def set_order(self, order): |
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| 141 | """ |
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| 142 | Set the order the scantable should be sorted by. |
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| 143 | Parameters: |
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[1045] | 144 | order: The list of column names to sort by in order |
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[948] | 145 | """ |
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| 146 | self._setorder(order) |
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| 147 | |
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| 148 | def get_scans(self): |
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| 149 | return list(self._getscans()) |
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| 150 | def get_cycles(self): |
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| 151 | return list(self._getcycles()) |
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| 152 | def get_beams(self): |
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| 153 | return list(self._getbeams()) |
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| 154 | def get_ifs(self): |
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| 155 | return list(self._getifs()) |
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| 156 | def get_pols(self): |
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| 157 | return list(self._getpols()) |
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| 158 | def get_poltypes(self): |
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| 159 | return list(self._getpoltypes()) |
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| 160 | def get_order(self): |
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| 161 | return list(self._getorder()) |
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[1337] | 162 | def get_query(self): |
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| 163 | prefix = "SELECT FROM $1 WHERE " |
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| 164 | return self._gettaql().replace(prefix, "") |
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[948] | 165 | def get_name(self): |
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| 166 | print "NYI" |
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| 167 | s = self._gettaql() |
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[1337] | 168 | return |
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| 169 | def __str__(self): |
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| 170 | out = "" |
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| 171 | d = {"SCANNO": self.get_scans(), |
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| 172 | "CYCLENO": self.get_cycles(), |
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| 173 | "BEAMNO": self.get_beams(), |
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| 174 | "IFNO": self.get_ifs(), |
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| 175 | "Pol Type": self.get_poltypes(), |
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| 176 | "POLNO": self.get_pols(), |
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| 177 | "QUERY": self.get_query(), |
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| 178 | "Sort Order": self.get_order() |
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| 179 | } |
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| 180 | for k,v in d.iteritems(): |
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| 181 | if v: |
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| 182 | out += "%s: %s\n" % (k, v) |
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| 183 | if len(out): |
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| 184 | return out[:-1] |
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| 185 | else: |
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| 186 | return out |
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[948] | 187 | def __add__(self, other): |
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| 188 | """ |
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| 189 | Merge two selections. |
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| 190 | """ |
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| 191 | union = selector() |
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| 192 | gets = [[self._getscans(), other._getscans(), union._setscans], |
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| 193 | [self._getcycles(), other._getcycles(),union._setcycles], |
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| 194 | [self._getbeams(), other._getbeams(), union._setbeams], |
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| 195 | [self._getifs(), other._getifs(), union._setifs], |
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| 196 | [self._getpols(), other._getpols(), union._setpols]] |
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| 197 | for v in gets: |
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| 198 | vec = list(v[0]+v[1]) |
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| 199 | vec.sort() |
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| 200 | v[2](unique(vec)) |
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[1349] | 201 | q = other.get_query() |
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| 202 | qs = self.get_query() |
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| 203 | if len(q) and len(qs): |
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| 204 | union.set_query(qs +" AND " + q) |
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| 205 | else: |
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| 206 | if len(q): |
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| 207 | union.set_query(q) |
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| 208 | elif len(qs): |
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| 209 | union.set_query(qs) |
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[948] | 210 | return union |
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