com.mysema.query.spatial.SurfaceExpression Maven / Gradle / Ivy
/*
* Copyright 2015, The Querydsl Team (http://www.querydsl.com/team)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.mysema.query.spatial;
import javax.annotation.Nullable;
import org.geolatte.geom.Geometry;
import org.geolatte.geom.Point;
import com.mysema.query.types.Expression;
import com.mysema.query.types.expr.NumberExpression;
import com.mysema.query.types.expr.NumberOperation;
/**
* A Surface is a 2-dimensional geometric object.
*
* @author tiwe
*
* @param
*/
public abstract class SurfaceExpression extends GeometryExpression {
private static final long serialVersionUID = 3534197011234723698L;
@Nullable
private volatile PointExpression centroid, pointOnSurface;
@Nullable
private volatile NumberExpression area;
public SurfaceExpression(Expression mixin) {
super(mixin);
}
/**
* The area of this Surface, as measured in the spatial reference system of this Surface.
*
* @return
*/
public NumberExpression area() {
if (area == null) {
area = NumberOperation.create(Double.class, SpatialOps.AREA, mixin);
}
return area;
}
/**
* The mathematical centroid for this Surface as a Point. The result is not guaranteed to
* be on this Surface.
*
* @return
*/
public PointExpression centroid() {
if (centroid == null) {
centroid = PointOperation.create(Point.class, SpatialOps.CENTROID, mixin);
}
return centroid;
}
/**
* A Point guaranteed to be on this Surface.
*
* @return
*/
public PointExpression pointOnSurface() {
if (pointOnSurface == null) {
pointOnSurface = PointOperation.create(Point.class, SpatialOps.POINT_ON_SURFACE, mixin);
}
return pointOnSurface;
}
}