Package adql.query.constraint
Class Exists
java.lang.Object
adql.query.constraint.Exists
- All Implemented Interfaces:
ADQLObject
,ADQLConstraint
Represents the predicate EXISTS of SQL and ADQL.
This function returns true
if the sub-query given in parameter
returns at least one result, else it returns false
.
-
Field Summary
Fields -
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 ADQLSet
Gets the sub-query of this EXISTS constraint.final void
setPosition
(TextPosition position) Set the position of thisExists
in the given ADQL query string.void
setSubQuery
(ADQLSet query) Replaces the sub-query of this EXISTS constraint by the given one.toADQL()
Gets the ADQL expression of this object.
-
Field Details
-
FEATURE
Description of this ADQL Feature.- Since:
- 2.0
-
-
Constructor Details
-
Exists
Builds an Exists constraint instance.- Parameters:
query
- Its sub-query.
-
Exists
Builds an Exists constraint by copying the given one.- Parameters:
toCopy
- The Exists constraint to copy.- Throws:
Exception
- If there is an error during the copy.
-
-
Method Details
-
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.
-
getSubQuery
Gets the sub-query of this EXISTS constraint.- Returns:
- Its sub-query.
-
setSubQuery
Replaces the sub-query of this EXISTS constraint by the given one.- Parameters:
query
- Its new sub-query.- Throws:
NullPointerException
- If the given query is NULL.
-
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).
-
setPosition
Set the position of thisExists
in the given ADQL query string.- Parameters:
position
- New position of thisExists
.- Since:
- 1.4
-
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.
- Throws:
Exception
- If there is any error during the copy.
-
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.
-
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.
-