com.querydsl.spatial.jts.JTSLineStringExpression 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.querydsl.spatial.jts;
import javax.annotation.Nullable;
import com.querydsl.core.types.ConstantImpl;
import com.querydsl.core.types.Expression;
import com.querydsl.core.types.dsl.Expressions;
import com.querydsl.core.types.dsl.NumberExpression;
import com.querydsl.spatial.SpatialOps;
import com.vividsolutions.jts.geom.LineString;
import com.vividsolutions.jts.geom.Point;
/**
* A LineString is a Curve with linear interpolation between Points. Each consecutive pair of Points defines a Line
* segment.
*
* @author tiwe
*
* @param
*/
public abstract class JTSLineStringExpression extends JTSCurveExpression {
private static final long serialVersionUID = -6572984614863252657L;
@Nullable
private transient volatile NumberExpression numPoints;
public JTSLineStringExpression(Expression mixin) {
super(mixin);
}
/**
* The number of Points in this LineString.
*
* @return number of points
*/
public NumberExpression numPoints() {
if (numPoints == null) {
numPoints = Expressions.numberOperation(Integer.class, SpatialOps.NUM_POINTS, mixin);
}
return numPoints;
}
/**
* Returns the specified Point N in this LineString.
*
* @param idx one based index
* @return point at index
*/
public JTSPointExpression pointN(int idx) {
return JTSGeometryExpressions.pointOperation(SpatialOps.POINTN, mixin, ConstantImpl.create(idx));
}
}