Package adql.query.operand
Class NullValue
java.lang.Object
adql.query.operand.NullValue
- All Implemented Interfaces:
ADQLObject
,ADQLOperand
Special value representing the absence of value (i.e. NULL in SQL).
- Since:
- 2.0
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Field Summary
FieldsModifier and TypeFieldDescriptionstatic final LanguageFeature
Description of this ADQL Feature.static final String
Operand name.protected TextPosition
Position of this operand. -
Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionGets an iterator on the intern ADQL objects.getCopy()
Gets a (deep) copy of this ADQL object.final LanguageFeature
Get the description of this ADQL's Language Feature.getName()
Gets the name of this object in ADQL.final TextPosition
Gets the position of this object/token in the ADQL query.final boolean
Always returnstrue
.final boolean
Always returnstrue
.final boolean
isString()
Always returnstrue
.final void
setPosition
(TextPosition position) Sets the position at which thisNullValue
has been found in the original ADQL query string.toADQL()
Gets the ADQL expression of this object.
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Field Details
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NAME
Operand name.- See Also:
-
FEATURE
Description of this ADQL Feature. -
position
Position of this operand.
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-
Constructor Details
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NullValue
- Throws:
NumberFormatException
-
NullValue
Builds a NumericConstant by copying the given one.- Parameters:
toCopy
- The NumericConstant to copy.
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-
Method Details
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getFeatureDescription
Description copied from interface:ADQLObject
Get the description of this ADQL's Language Feature.Note: Getting this description is generally only useful when discovery optional features so that determining if they are allowed to be used in ADQL queries.
- Specified by:
getFeatureDescription
in interfaceADQLObject
- Returns:
- Description of this ADQL object as an ADQL's feature.
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isNumeric
public final boolean isNumeric()Always returnstrue
.- Specified by:
isNumeric
in interfaceADQLOperand
- Returns:
- true if this operand is numeric, false otherwise.
- See Also:
-
isString
public final boolean isString()Always returnstrue
.- Specified by:
isString
in interfaceADQLOperand
- Returns:
- true if this operand is a string, false otherwise.
- See Also:
-
getPosition
Description copied from interface:ADQLObject
Gets the position of this object/token in the ADQL query.By default, no position should be set.
- Specified by:
getPosition
in interfaceADQLObject
- Returns:
- Position of this ADQL item in the ADQL query, or NULL if not written originally in the query (for example, if added afterwards).
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setPosition
Sets the position at which thisNullValue
has been found in the original ADQL query string.- Parameters:
position
- Position of thisNullValue
.
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isGeometry
public final boolean isGeometry()Always returnstrue
.- Specified by:
isGeometry
in interfaceADQLOperand
- Returns:
- true if this operand is a geometry, false otherwise.
- See Also:
-
getCopy
Description copied from interface:ADQLObject
Gets a (deep) copy of this ADQL object.- Specified by:
getCopy
in interfaceADQLObject
- Returns:
- The copy of this ADQL object.
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getName
Description copied from interface:ADQLObject
Gets the name of this object in ADQL.- Specified by:
getName
in interfaceADQLObject
- Returns:
- The name of this ADQL object.
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adqlIterator
Description copied from interface:ADQLObject
Gets an iterator on the intern ADQL objects.Note: The returned iterator is particularly used by a
ISearchHandler
extension to browse a whole ADQL tree.- Specified by:
adqlIterator
in interfaceADQLObject
- Returns:
- An ADQL objects iterator.
- See Also:
-
toADQL
Description copied from interface:ADQLObject
Gets the ADQL expression of this object.- Specified by:
toADQL
in interfaceADQLObject
- Returns:
- The corresponding ADQL expression.
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