Class CentroidFunction
java.lang.Object
adql.query.operand.function.ADQLFunction
adql.query.operand.function.geometry.GeometryFunction
adql.query.operand.function.geometry.CentroidFunction
- All Implemented Interfaces:
ADQLObject
,ADQLOperand
It represents the CENTROID function of the ADQL language.
This function computes the centroid of a given geometry and returns a POINT.
Example:
CENTROID(CIRCLE('ICRS GEOCENTER', 25.4, -20.0, 1))
In this example the function computes the centroid of a circle of one degree radius centered
in a position of (25.4,-20.0) degrees and defined according to the ICRS coordinate system with GEOCENTER reference position.
- Version:
- 1.4 (02/2017)
- Author:
- Grégory Mantelet (CDS;ARI)
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Nested Class Summary
Nested classes/interfaces inherited from class adql.query.operand.function.geometry.GeometryFunction
GeometryFunction.GeometryValue<F extends GeometryFunction>
Nested classes/interfaces inherited from class adql.query.operand.function.ADQLFunction
ADQLFunction.ParameterIterator
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Field Summary
FieldsModifier and TypeFieldDescriptionprotected GeometryFunction.GeometryValue<GeometryFunction>
The geometry whose the centroid must be extracted.Fields inherited from class adql.query.operand.function.geometry.GeometryFunction
coordSys
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Constructor Summary
ConstructorsConstructorDescriptionCentroidFunction
(CentroidFunction toCopy) Builds a CENTROID function by copying the given one.Builds a CENTROID function. -
Method Summary
Modifier and TypeMethodDescriptiongetCopy()
Gets a (deep) copy of this ADQL object.getName()
Gets the name of this object in ADQL.int
Gets the number of parameters this function has.getParameter
(int index) Gets the index-th parameter.Gets the list of all parameters of this function.boolean
Tell whether this operand is a geometrical region or not.boolean
Tell whether this operand is numeric or not.boolean
isString()
Tell whether this operand is a string or not.setParameter
(int index, ADQLOperand replacer) Replaces the index-th parameter by the given one.Methods inherited from class adql.query.operand.function.geometry.GeometryFunction
getCoordinateSystem, setCoordinateSystem
Methods inherited from class adql.query.operand.function.ADQLFunction
adqlIterator, getPosition, paramIterator, setPosition, toADQL
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Field Details
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parameter
The geometry whose the centroid must be extracted.
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Constructor Details
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CentroidFunction
public CentroidFunction(GeometryFunction.GeometryValue<GeometryFunction> param) throws NullPointerException Builds a CENTROID function.- Parameters:
param
- The geometry whose the centroid must be extracted.- Throws:
NullPointerException
- If the given parameter is null.
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CentroidFunction
Builds a CENTROID function by copying the given one.- Parameters:
toCopy
- The CENTROID function to copy.- Throws:
Exception
- If there is an error during the copy.
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Method Details
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getCopy
Description copied from interface:ADQLObject
Gets a (deep) copy of this ADQL object.- Returns:
- The copy of this ADQL object.
- Throws:
Exception
- If there is any error during the copy.
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getName
Description copied from interface:ADQLObject
Gets the name of this object in ADQL.- Returns:
- The name of this ADQL object.
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isNumeric
public boolean isNumeric()Description copied from interface:ADQLOperand
Tell whether this operand is numeric or not.- Returns:
- true if this operand is numeric, false otherwise.
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isString
public boolean isString()Description copied from interface:ADQLOperand
Tell whether this operand is a string or not.- Returns:
- true if this operand is a string, false otherwise.
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isGeometry
public boolean isGeometry()Description copied from interface:ADQLOperand
Tell whether this operand is a geometrical region or not.- Returns:
- true if this operand is a geometry, false otherwise.
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getParameters
Description copied from class:ADQLFunction
Gets the list of all parameters of this function.- Specified by:
getParameters
in classADQLFunction
- Returns:
- Its parameters list.
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getNbParameters
public int getNbParameters()Description copied from class:ADQLFunction
Gets the number of parameters this function has.- Specified by:
getNbParameters
in classADQLFunction
- Returns:
- Number of parameters.
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getParameter
Description copied from class:ADQLFunction
Gets the index-th parameter.- Specified by:
getParameter
in classADQLFunction
- Parameters:
index
- Parameter number.- Returns:
- The corresponding parameter.
- Throws:
ArrayIndexOutOfBoundsException
- If the index is incorrect (index < 0 || index >= getNbParameters()).
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setParameter
public ADQLOperand setParameter(int index, ADQLOperand replacer) throws ArrayIndexOutOfBoundsException, NullPointerException, Exception Description copied from class:ADQLFunction
Replaces the index-th parameter by the given one.- Specified by:
setParameter
in classADQLFunction
- Parameters:
index
- Index of the parameter to replace.replacer
- The replacer.- Returns:
- The replaced parameter.
- Throws:
ArrayIndexOutOfBoundsException
- If the index is incorrect (index < 0 || index >= getNbParameters()).NullPointerException
- If a required parameter must be replaced by a NULL object.Exception
- If another error occurs.
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