package adql.query.operand.function.geometry;
/*
* This file is part of ADQLLibrary.
*
* ADQLLibrary is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* ADQLLibrary is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with ADQLLibrary. If not, see <http://www.gnu.org/licenses/>.
*
* Copyright 2012-2015 - UDS/Centre de Données astronomiques de Strasbourg (CDS),
* Astronomisches Rechen Institut (ARI)
*/
import adql.query.ADQLObject;
import adql.query.operand.ADQLOperand;
/**
* <p>It represents the CIRCLE function of the ADQL language.</p>
*
* <p>This function expresses a circular region on the sky (a cone in space) and corresponds semantically to the STC circle region.
* The function arguments specify the coordinate system, the center position, and the radius (in degrees).</p>
*
* <p><i><u>Example:</u><br />
* CIRCLE('ICRS GEOCENTER', 25.4, -20.0, 1)<br />
* In this example the function expresses 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.
* </i></p>
*
* @author Grégory Mantelet (CDS;ARI)
* @version 1.4 (06/2015)
*/
public class CircleFunction extends GeometryFunction {
/** The first coordinate of the center position. */
private ADQLOperand coord1;
/** The second coordinate of the center position. */
private ADQLOperand coord2;
/** The radius of the circle (in degrees). */
private ADQLOperand radius;
/**
* Builds a CIRCLE function.
*
* @param coordinateSystem The coordinate system in which the center position is expressed.
* @param firstCoord The first coordinate of the center position.
* @param secondCoord The second coordinate of the center position.
* @param radius The radius of the circle (in degrees).
* @throws NullPointerException If at least one parameter is incorrect or if the coordinate system is unknown.
* @throws Exception If there is another error.
*/
public CircleFunction(ADQLOperand coordinateSystem, ADQLOperand firstCoord, ADQLOperand secondCoord, ADQLOperand radius) throws NullPointerException, Exception{
super(coordinateSystem);
if (firstCoord == null || secondCoord == null || radius == null)
throw new NullPointerException("All parameters of a CIRCLE function must be different from NULL !");
coord1 = firstCoord;
coord2 = secondCoord;
this.radius = radius;
}
/**
* Builds a CIRCLE function by copying the given one.
*
* @param toCopy The CIRCLE function to copy.
* @throws Exception If there is an error during the copy.
*/
public CircleFunction(CircleFunction toCopy) throws Exception{
super(toCopy);
coord1 = (ADQLOperand)(toCopy.coord1.getCopy());
coord2 = (ADQLOperand)(toCopy.coord2.getCopy());
radius = (ADQLOperand)(toCopy.radius.getCopy());
}
@Override
public ADQLObject getCopy() throws Exception{
return new CircleFunction(this);
}
@Override
public String getName(){
return "CIRCLE";
}
@Override
public boolean isNumeric(){
return false;
}
@Override
public boolean isString(){
return false;
}
@Override
public boolean isGeometry(){
return true;
}
/**
* Gets the first coordinate of the center (i.e. right ascension).
*
* @return The first coordinate.
*/
public final ADQLOperand getCoord1(){
return coord1;
}
/**
* Sets the first coordinate of the center (i.e. right ascension).
*
* @param coord1 The first coordinate.
*/
public final void setCoord1(ADQLOperand coord1){
this.coord1 = coord1;
setPosition(null);
}
/**
* Gets the second coordinate of the center (i.e. declination).
*
* @return The second coordinate.
*/
public final ADQLOperand getCoord2(){
return coord2;
}
/**
* Sets the second coordinate of the center (i.e. declination).
*
* @param coord2 The second coordinate.
*/
public final void setCoord2(ADQLOperand coord2){
this.coord2 = coord2;
setPosition(null);
}
/**
* Gets the radius of the center.
*
* @return The radius.
*/
public final ADQLOperand getRadius(){
return radius;
}
/**
* Sets the radius of the center.
*
* @param radius The radius.
*/
public final void setRadius(ADQLOperand radius){
this.radius = radius;
setPosition(null);
}
@Override
public ADQLOperand[] getParameters(){
return new ADQLOperand[]{coordSys,coord1,coord2,radius};
}
@Override
public int getNbParameters(){
return 4;
}
@Override
public ADQLOperand getParameter(int index) throws ArrayIndexOutOfBoundsException{
switch(index){
case 0:
return coordSys;
case 1:
return coord1;
case 2:
return coord2;
case 3:
return radius;
default:
throw new ArrayIndexOutOfBoundsException("No " + index + "-th parameter for the function \"" + getName() + "\" !");
}
}
@Override
public ADQLOperand setParameter(int index, ADQLOperand replacer) throws ArrayIndexOutOfBoundsException, NullPointerException, Exception{
if (replacer == null)
throw new NullPointerException("Impossible to remove one parameter of a " + getName() + " function !");
ADQLOperand replaced = null;
switch(index){
case 0:
replaced = coordSys;
setCoordinateSystem(replacer);
break;
case 1:
replaced = coord1;
coord1 = replacer;
break;
case 2:
replaced = coord2;
coord2 = replacer;
break;
case 3:
replaced = radius;
radius = replacer;
break;
default:
throw new ArrayIndexOutOfBoundsException("No " + index + "-th parameter for the function \"" + getName() + "\" !");
}
setPosition(null);
return replaced;
}
}