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Access.h
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1// -*- lsst-c++ -*-
2#ifndef AFW_TABLE_DETAIL_Access_h_INCLUDED
3#define AFW_TABLE_DETAIL_Access_h_INCLUDED
4
5#include <cstring>
6
7#include "ndarray/Manager.h"
11
12namespace lsst {
13namespace afw {
14namespace table {
15
16class BaseRecord;
17class BaseTable;
18
19namespace detail {
20
31class Access final {
32public:
34 template <typename T>
36 if (!static_cast<Key<T> const &>(kb).isValid()) {
37 throw LSST_EXCEPT(
39 (boost::format(
40 "Cannot extract subfield key from invalid key of type '%s' "
41 "(most often this is caused by failing to setup centroid or shape slots)") %
43 .str());
44 }
45 return Key<typename Key<T>::Element>(static_cast<Key<T> const &>(kb).getOffset() +
46 n * sizeof(typename Key<T>::Element));
47 }
48
50 template <typename T>
52 if (!static_cast<Key<Array<T> > const &>(kb).isValid()) {
54 (boost::format("Cannot extract subfield key from invalid key of type '%s' ") %
56 .str());
57 }
58 return Key<Array<T> >(static_cast<Key<Array<T> > const &>(kb).getOffset() +
59 begin * sizeof(typename Key<T>::Element),
60 end - begin);
61 }
62
64 template <typename T>
65 static Key<T> makeKey(std::size_t offset) {
66 return Key<T>(offset);
67 }
68
70 template <typename T>
71 static Key<T> makeKey(Field<T> const &field, std::size_t offset) {
72 return Key<T>(offset, field);
73 }
74
76 static Key<Flag> makeKey(std::size_t offset, std::size_t bit) { return Key<Flag>(offset, bit); }
77
79 static Key<std::string> makeKeyString(std::size_t offset, std::size_t size) { return Key<std::string>(offset, size); }
80
82 template <typename T>
84 return Key<Array<T>>(offset, size);
85 }
86
88 static void padSchema(Schema &schema, std::size_t bytes) {
89 schema._edit();
90 schema._impl->_recordSize += bytes;
91 }
92};
93} // namespace detail
94} // namespace table
95} // namespace afw
96} // namespace lsst
97
98#endif // !AFW_TABLE_DETAIL_Access_h_INCLUDED
#define LSST_EXCEPT(type,...)
Create an exception with a given type.
Definition Exception.h:48
Tag types used to declare specialized field types.
Definition misc.h:31
Base class for all records.
Definition BaseRecord.h:31
Base class for all tables.
Definition BaseTable.h:61
A base class for Key that allows subfield keys to be extracted for some field types.
Definition KeyBase.h:20
A class used as a handle to a particular field in a table.
Definition Key.h:53
std::size_t getOffset() const noexcept
Return the offset (in bytes) of this field within a record.
Definition Key.h:87
Defines the fields and offsets for a table.
Definition Schema.h:51
static Key< typename Key< T >::Element > extractElement(KeyBase< T > const &kb, std::size_t n)
Definition Access.h:35
static Key< Array< T > > extractRange(KeyBase< Array< T > > const &kb, std::size_t begin, std::size_t end)
Definition Access.h:51
static Key< T > makeKey(std::size_t offset)
Definition Access.h:65
static void padSchema(Schema &schema, std::size_t bytes)
Definition Access.h:88
static Key< T > makeKey(Field< T > const &field, std::size_t offset)
Definition Access.h:71
static Key< Array< T > > makeKeyArray(std::size_t offset, std::size_t size)
Definition Access.h:83
static Key< Flag > makeKey(std::size_t offset, std::size_t bit)
Definition Access.h:76
static Key< std::string > makeKeyString(std::size_t offset, std::size_t size)
Definition Access.h:79
Reports errors in the logical structure of the program.
Definition Runtime.h:46
static std::string getTypeString()
Return a string description of the field type.
Definition FieldBase.cc:56
T Element
the type of subfields (the same as the type itself for scalars)
Definition FieldBase.h:45
A description of a field in a table.
Definition Field.h:24