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1 : //# MSIter2.h: MSIter w/ smarter interval handling
2 : //# Copyright (C) 1996,1999,2000,2001,2002
3 : //# Associated Universities, Inc. Washington DC, USA.
4 : //#
5 : //# This library is free software; you can redistribute it and/or modify it
6 : //# under the terms of the GNU Library General Public License as published by
7 : //# the Free Software Foundation; either version 2 of the License, or (at your
8 : //# option) any later version.
9 : //#
10 : //# This library is distributed in the hope that it will be useful, but WITHOUT
11 : //# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 : //# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
13 : //# License for more details.
14 : //#
15 : //# You should have received a copy of the GNU Library General Public License
16 : //# along with this library; if not, write to the Free Software Foundation,
17 : //# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
18 : //#
19 : //# Correspondence concerning AIPS++ should be addressed as follows:
20 : //# Internet email: aips2-request@nrao.edu.
21 : //# Postal address: AIPS++ Project Office
22 : //# National Radio Astronomy Observatory
23 : //# 520 Edgemont Road
24 : //# Charlottesville, VA 22903-2475 USA
25 : //#
26 : //# $Id$
27 :
28 : #ifndef MS_MSITER2_H
29 : #define MS_MSITER2_H
30 :
31 : #include <casacore/casa/aips.h>
32 : #include <casacore/ms/MeasurementSets/MSIter.h>
33 :
34 : namespace casa { //# NAMESPACE CASA - BEGIN
35 : namespace vi { //# NAMESPACE VI - BEGIN
36 :
37 : //# forward decl
38 : //class MSColumns;
39 : //class TableIterator;
40 :
41 : // <summary>
42 : // Small helper class to specify an 'interval' comparison
43 : // </summary>
44 : // <synopsis>
45 : // Small helper class to specify an 'interval' comparison for table iteration
46 : // by time interval.
47 : // </synopsis>
48 : class MSSmartInterval : public casacore::MSInterval
49 : {
50 : public:
51 : explicit MSSmartInterval(casacore::Double interval,
52 : casacore::Vector<casacore::Double>& timeboundaries);
53 167 : virtual ~MSSmartInterval() {}
54 : virtual void setOffset(casacore::Double offset);
55 : virtual int comp(const void * obj1, const void * obj2) const;
56 :
57 : private:
58 :
59 : // Local versions of MSInterval::interval_p,offset_p so we
60 : // can avoid function calls and obj copies in comp()
61 : casacore::Double interval2_;
62 : mutable casacore::Double offset2_;
63 :
64 : // A list of enforced interval time boundaries (e.g., scan bounds).
65 : // the interval grid will be re-registered to each
66 : // of the values in this Vector as supplied times cross them
67 : casacore::Vector<casacore::Double> timeBounds_;
68 : int nBounds_;
69 :
70 : // Is specified interval effectively zero?
71 : casacore::Bool zeroInterval_;
72 :
73 : // Utility variables used in comp
74 : mutable casacore::Bool found_;
75 : mutable int bidx_;
76 : mutable double t1_,t2_;
77 :
78 : };
79 :
80 : // <summary>
81 : // An iterator class for MeasurementSets
82 : // </summary>
83 :
84 : // <use visibility=export>
85 :
86 : // <prerequisite>
87 : // <li> <linkto class="MeasurementSet:description">MeasurementSet</linkto>
88 : // </prerequisite>
89 : //
90 : // <etymology>
91 : // MSIter stands for the MeasurementSet Iterator class.
92 : // </etymology>
93 : //
94 : // <synopsis>
95 : // An MSIter is a class to traverse a MeasurementSet in various orders. It
96 : // automatically adds four predefined sort columns to your selection of sort
97 : // columns (see constructor) so that it can keep track of changes in frequency
98 : // or polarization setup, field position and sub-array. Note that this can
99 : // cause iterations to occur in a different way from what you would expect, see
100 : // examples below. MSIter implements iteration by time interval for the use of
101 : // e.g., calibration tasks that want to calculate solutions over some interval
102 : // of time. You can iterate over multiple MeasurementSets with this class.
103 : // </synopsis>
104 : //
105 : // <example>
106 : // <srcblock>
107 : // // The following code iterates by by ARRAY_ID, FIELD_ID, DATA_DESC_ID and
108 : // // TIME (all implicitly added columns) and then by baseline (antenna pair),
109 : // // in 3000s intervals.
110 : // MeasurementSet ms("3C273XC1.ms");
111 : // Block<int> sort(2);
112 : // sort[0] = MS::ANTENNA1;
113 : // sort[1] = MS::ANTENNA2;
114 : // Double timeInterval = 3000;
115 : // MSIter msIter(ms,sort,timeInteval);
116 : // for (msIter.origin(); msIter.more(); msIter++) {
117 : // // print out some of the iteration state
118 : // cout << msIter.fieldId() << endl;
119 : // cout << msIter.fieldName() << endl;
120 : // cout << msIter.dataDescriptionId() << endl;
121 : // cout << msIter.frequency0() << endl;
122 : // cout << msIter.table().nrow() << endl;
123 : // process(msIter.table()); // process the data in the current iteration
124 : // }
125 : // // Output shows only 1 row at a time because the table is sorted on TIME
126 : // // first and ANTENNA1, ANTENNA2 next and each baseline occurs only once per
127 : // // TIME stamp. The interval has no effect in this case.
128 : // </srcblock>
129 : // </example>
130 :
131 : // <example>
132 : // <srcblock>
133 : // // The following code iterates by baseline (antenna pair), TIME, and,
134 : // // implicitly, by ARRAY_ID, FIELD_ID and DATA_DESC_ID in 3000s
135 : // // intervals.
136 : // MeasurementSet ms("3C273XC1.ms");
137 : // Block<int> sort(3);
138 : // sort[0] = MS::ANTENNA1;
139 : // sort[1] = MS::ANTENNA2;
140 : // sort[2] = MS::TIME;
141 : // Double timeInterval = 3000;
142 : // MSIter msIter(ms,sort,timeInteval);
143 : // for (msIter.origin(); msIter.more(); msIter++) {
144 : // // print out some of the iteration state
145 : // cout << msIter.fieldId() << endl;
146 : // cout << msIter.fieldName() << endl;
147 : // cout << msIter.dataDescriptionId() << endl;
148 : // cout << msIter.frequency0() << endl;
149 : // cout << msIter.table().nrow() << endl;
150 : // process(msIter.table()); // process the data in the current iteration
151 : // // Now the output shows 7 rows at a time, all with identical ANTENNA1
152 : // // and ANTENNA2 values and TIME values within a 3000s interval.
153 : // }
154 : // </srcblock>
155 : // </example>
156 : //
157 : // <motivation>
158 : // This class was originally part of the VisibilityIterator class, but that
159 : // class was getting too large and complicated. By splitting out the toplevel
160 : // iteration into this class the code is much easier to understand. It is now
161 : // also available through the ms tool.
162 : // </motivation>
163 : //
164 : // <todo>
165 : // multiple observatories in a single MS are not handled correctly (need to
166 : // sort on observation id and check observatory name to set position frame)
167 : // </todo>
168 :
169 : class MSIter2 : public casacore::MSIter
170 : {
171 : public:
172 :
173 : // Default constructor - useful only to assign another iterator later.
174 : // Use of other member functions on this object is likely to dump core.
175 : MSIter2();
176 :
177 : MSIter2(const casacore::MeasurementSet& ms, const casacore::Block<int>& sortColumns,
178 : double timeInterval=0, bool addDefaultSortColumns=true,
179 : bool storeSorted=true);
180 :
181 : // Same as above with multiple MSs as input.
182 : MSIter2(const casacore::Block<casacore::MeasurementSet>& mss, const casacore::Block<int>& sortColumns,
183 : double timeInterval=0, bool addDefaultSortColumns=true,
184 : bool storeSorted=true);
185 :
186 : // Copy construct. This calls the assigment operator.
187 : MSIter2(const MSIter2& other);
188 :
189 : // Destructor
190 : virtual ~MSIter2();
191 :
192 : // Assigment. This will reset the iterator to the origin.
193 : MSIter2 & operator=(const MSIter2 &other);
194 :
195 : // Reset iterator to start of data
196 : // This specialization resets the time-compare object
197 : // before calling parent
198 : virtual void origin();
199 :
200 : protected:
201 : // handle the construction details
202 : void construct2(const casacore::Block<int>& sortColumns, casacore::Bool addDefaultSortColumns);
203 :
204 : // set the iteration state
205 : virtual void setState();
206 :
207 : virtual void discernEnforcedTimeBounds(casacore::Vector<casacore::Double>& solbounds,
208 : casacore::Bool scanBounded);
209 : virtual void discernEnforcedTimeBounds(casacore::Vector<casacore::Double>& solbounds,
210 : casacore::Bool scanBounded,casacore::Bool fieldBounded);
211 : virtual void discernEnforcedTimeBounds(casacore::Vector<casacore::Double>& solbounds,
212 : casacore::Bool scanBounded,casacore::Bool fieldBounded,
213 : casacore::Double dt);
214 :
215 : };
216 :
217 : } //# NAMESPACE VI - END
218 : } //# NAMESPACE CASA - END
219 :
220 : #endif
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