public class ColumnInfo extends DefaultValueInfo
DefaultValueInfo
, but for historical reasons it contains
some additional methods for access to the
auxiliary metadata items.
In earlier versions of the library, columns were allowed to store
auxiliary metadata and non-column items (like table parameters)
were not, but now they have the same capabilities.Constructor and Description |
---|
ColumnInfo(java.lang.String name)
Constructs a ColumnInfo object.
|
ColumnInfo(java.lang.String name,
java.lang.Class<?> contentClass,
java.lang.String description)
Constructs a new ColumnInfo object with a given name,
class and description.
|
ColumnInfo(ValueInfo base)
Constructs a new ColumnInfo based on a ValueInfo
object.
|
Modifier and Type | Method and Description |
---|---|
DescribedValue |
getAuxDatum(ValueInfo vinfo)
Gets an item of auxiliary metadata from its specification.
|
<T> T |
getAuxDatumValue(ValueInfo vinfo,
java.lang.Class<T> clazz)
Gets the value of an item of auxiliary metadata using its specification,
requiring a particular return type.
|
<T> T |
getAuxDatumValueByName(java.lang.String name,
java.lang.Class<T> clazz)
Gets the value of an item of auxiliary metadata by its name,
requiring a particular return type.
|
formatClass, formatShape, formatValue, generalise, getAuxData, getContentClass, getDescription, getDomainMappers, getElementSize, getName, getShape, getUCD, getUnitString, getUtype, getXtype, isArray, isNullable, setAuxData, setContentClass, setDescription, setDomainMappers, setElementSize, setName, setNullable, setShape, setUCD, setUnitString, setUtype, setXtype, toString, unformatShape, unformatString
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
getAuxDatumByName, setAuxDatum
public ColumnInfo(java.lang.String name)
name
- the name of the columnpublic ColumnInfo(ValueInfo base)
base
- the template ValueInfopublic ColumnInfo(java.lang.String name, java.lang.Class<?> contentClass, java.lang.String description)
name
- the name applying to described valuescontentClass
- the class of which described values should be
instancesdescription
- a textual description of the described valuespublic DescribedValue getAuxDatum(ValueInfo vinfo)
vinfo
- the data item to matchpublic <T> T getAuxDatumValue(ValueInfo vinfo, java.lang.Class<T> clazz)
getAuxDatum(uk.ac.starlink.table.ValueInfo)
but returns a non-null value
only if the named item exists and if its value is an instance of
the given type clazz.vinfo
- the data item to matchclazz
- required return typepublic <T> T getAuxDatumValueByName(java.lang.String name, java.lang.Class<T> clazz)
ValueInfo.getAuxDatumByName(java.lang.String)
,
but returns a non-null value only if the named item exists,
and if its value is an instance of the given type clazz.name
- the name of an auxiliary metadata itemclazz
- required return type